diff --git a/packages/chopsticks/src/cli.ts b/packages/chopsticks/src/cli.ts
index 9f8f1ea4..3c2a0afe 100644
--- a/packages/chopsticks/src/cli.ts
+++ b/packages/chopsticks/src/cli.ts
@@ -5,7 +5,7 @@ import type { MiddlewareFunction } from 'yargs'
 import { hideBin } from 'yargs/helpers'
 import { z } from 'zod'
 
-import { Blockchain, connectParachains, connectVertical, environment } from '@acala-network/chopsticks-core'
+import { type Blockchain, connectParachains, connectVertical, environment } from '@acala-network/chopsticks-core'
 import { setupWithServer } from './index.js'
 import { loadRpcMethodsByScripts, pluginExtendCli } from './plugins/index.js'
 import { configSchema, fetchConfig, getYargsOptions } from './schema/index.js'
diff --git a/packages/chopsticks/src/context.ts b/packages/chopsticks/src/context.ts
index e4480a2a..8cc7d3e8 100644
--- a/packages/chopsticks/src/context.ts
+++ b/packages/chopsticks/src/context.ts
@@ -1,10 +1,17 @@
 import './utils/tunnel.js'
-import { BlockEntry, GenesisProvider, defaultLogger, isUrl, setup, timeTravel } from '@acala-network/chopsticks-core'
+import {
+  type BlockEntry,
+  GenesisProvider,
+  defaultLogger,
+  isUrl,
+  setup,
+  timeTravel,
+} from '@acala-network/chopsticks-core'
 import { SqliteDatabase } from '@acala-network/chopsticks-db'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import axios from 'axios'
 import { apiFetching } from './logger.js'
-import { Config } from './schema/index.js'
+import type { Config } from './schema/index.js'
 import { startFetchStorageWorker } from './utils/fetch-storages.js'
 import { overrideStorage, overrideWasm } from './utils/override.js'
 
diff --git a/packages/chopsticks/src/plugins/decode-key/cli.ts b/packages/chopsticks/src/plugins/decode-key/cli.ts
index 60120a3e..50bce8c0 100644
--- a/packages/chopsticks/src/plugins/decode-key/cli.ts
+++ b/packages/chopsticks/src/plugins/decode-key/cli.ts
@@ -1,5 +1,5 @@
 import { decodeKey } from '@acala-network/chopsticks-core'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import type { Argv } from 'yargs'
 import { setupContext } from '../../context.js'
 import { configSchema, getYargsOptions } from '../../schema/index.js'
diff --git a/packages/chopsticks/src/plugins/dry-run/dry-run-extrinsic.ts b/packages/chopsticks/src/plugins/dry-run/dry-run-extrinsic.ts
index 406278a3..d3c58a9d 100644
--- a/packages/chopsticks/src/plugins/dry-run/dry-run-extrinsic.ts
+++ b/packages/chopsticks/src/plugins/dry-run/dry-run-extrinsic.ts
@@ -1,12 +1,12 @@
 import { writeFileSync } from 'node:fs'
 import { blake2AsHex } from '@polkadot/util-crypto'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
 import { setupContext } from '../../context.js'
 import { defaultLogger } from '../../logger.js'
 import { generateHtmlDiffPreviewFile } from '../../utils/generate-html-diff.js'
 import { openHtml } from '../../utils/open-html.js'
-import { DryRunSchemaType } from './index.js'
+import type { DryRunSchemaType } from './index.js'
 
 export const dryRunExtrinsic = async (argv: DryRunSchemaType) => {
   const context = await setupContext(argv)
diff --git a/packages/chopsticks/src/plugins/dry-run/dry-run-preimage.ts b/packages/chopsticks/src/plugins/dry-run/dry-run-preimage.ts
index 31e14511..46fe8a3c 100644
--- a/packages/chopsticks/src/plugins/dry-run/dry-run-preimage.ts
+++ b/packages/chopsticks/src/plugins/dry-run/dry-run-preimage.ts
@@ -1,13 +1,13 @@
 import { compactAddLength, hexToU8a } from '@polkadot/util'
 import { blake2AsHex } from '@polkadot/util-crypto'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
 import { Block, newHeader, runTask, setStorage, taskHandler } from '@acala-network/chopsticks-core'
 import { setupContext } from '../../context.js'
 import { defaultLogger } from '../../logger.js'
 import { generateHtmlDiffPreviewFile } from '../../utils/generate-html-diff.js'
 import { openHtml } from '../../utils/open-html.js'
-import { DryRunSchemaType } from './index.js'
+import type { DryRunSchemaType } from './index.js'
 
 export const dryRunPreimage = async (argv: DryRunSchemaType) => {
   const context = await setupContext(argv)
diff --git a/packages/chopsticks/src/plugins/dry-run/rpc.ts b/packages/chopsticks/src/plugins/dry-run/rpc.ts
index 24bc1de2..0917a832 100644
--- a/packages/chopsticks/src/plugins/dry-run/rpc.ts
+++ b/packages/chopsticks/src/plugins/dry-run/rpc.ts
@@ -1,6 +1,6 @@
 import { z } from 'zod'
 
-import { Context, ResponseError } from '@acala-network/chopsticks-core'
+import { type Context, ResponseError } from '@acala-network/chopsticks-core'
 import { zHash, zHex } from '../../schema/index.js'
 import { decodeStorageDiff } from '../../utils/decoder.js'
 import { generateHtmlDiff } from '../../utils/generate-html-diff.js'
diff --git a/packages/chopsticks/src/plugins/follow-chain/cli.ts b/packages/chopsticks/src/plugins/follow-chain/cli.ts
index 1788cca5..e521d448 100644
--- a/packages/chopsticks/src/plugins/follow-chain/cli.ts
+++ b/packages/chopsticks/src/plugins/follow-chain/cli.ts
@@ -1,6 +1,6 @@
 import { Block, defaultLogger, runTask, taskHandler } from '@acala-network/chopsticks-core'
-import { Header } from '@polkadot/types/interfaces'
-import { HexString } from '@polkadot/util/types'
+import type { Header } from '@polkadot/types/interfaces'
+import type { HexString } from '@polkadot/util/types'
 import _ from 'lodash'
 import type { Argv } from 'yargs'
 import { z } from 'zod'
diff --git a/packages/chopsticks/src/plugins/index.ts b/packages/chopsticks/src/plugins/index.ts
index 3f95cee7..695d4d41 100644
--- a/packages/chopsticks/src/plugins/index.ts
+++ b/packages/chopsticks/src/plugins/index.ts
@@ -1,5 +1,5 @@
 import { lstatSync, readFileSync, readdirSync } from 'node:fs'
-import { Handlers, environment } from '@acala-network/chopsticks-core'
+import { type Handlers, environment } from '@acala-network/chopsticks-core'
 import _ from 'lodash'
 import type { Argv } from 'yargs'
 
diff --git a/packages/chopsticks/src/plugins/run-block/cli.ts b/packages/chopsticks/src/plugins/run-block/cli.ts
index 259186b8..c6a52b25 100644
--- a/packages/chopsticks/src/plugins/run-block/cli.ts
+++ b/packages/chopsticks/src/plugins/run-block/cli.ts
@@ -1,5 +1,5 @@
 import { writeFileSync } from 'node:fs'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import _ from 'lodash'
 import type { Argv } from 'yargs'
 import { z } from 'zod'
diff --git a/packages/chopsticks/src/plugins/run-block/rpc.ts b/packages/chopsticks/src/plugins/run-block/rpc.ts
index 8f18fd7a..c8024e5c 100644
--- a/packages/chopsticks/src/plugins/run-block/rpc.ts
+++ b/packages/chopsticks/src/plugins/run-block/rpc.ts
@@ -1,14 +1,14 @@
-import { GenericExtrinsic } from '@polkadot/types'
-import { Header } from '@polkadot/types/interfaces'
+import type { GenericExtrinsic } from '@polkadot/types'
+import type { Header } from '@polkadot/types/interfaces'
 import { u8aToHex } from '@polkadot/util'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import _ from 'lodash'
 import { z } from 'zod'
 
 import {
   Block,
-  Context,
-  RuntimeLog,
+  type Context,
+  type RuntimeLog,
   compactHex,
   decodeKeyValue,
   runTask,
diff --git a/packages/chopsticks/src/plugins/trace-transaction/index.ts b/packages/chopsticks/src/plugins/trace-transaction/index.ts
index cf3cb5e5..0783c86b 100644
--- a/packages/chopsticks/src/plugins/trace-transaction/index.ts
+++ b/packages/chopsticks/src/plugins/trace-transaction/index.ts
@@ -1,7 +1,7 @@
 import { writeFileSync } from 'node:fs'
 import { pinoLogger } from '@acala-network/chopsticks-core'
 import _ from 'lodash'
-import { Argv } from 'yargs'
+import type { Argv } from 'yargs'
 import { z } from 'zod'
 
 import { setupContext } from '../../context.js'
diff --git a/packages/chopsticks/src/plugins/trace-transaction/types.ts b/packages/chopsticks/src/plugins/trace-transaction/types.ts
index ed3a04d0..58054303 100644
--- a/packages/chopsticks/src/plugins/trace-transaction/types.ts
+++ b/packages/chopsticks/src/plugins/trace-transaction/types.ts
@@ -1,5 +1,5 @@
-import { Registry } from '@polkadot/types/types'
-import { HexString } from '@polkadot/util/types'
+import type { Registry } from '@polkadot/types/types'
+import type { HexString } from '@polkadot/util/types'
 
 export type CallTrace = {
   type: 'CALL' | 'CALLCODE' | 'STATICCALL' | 'DELEGATECALL' | 'CREATE' | 'SUICIDE'
diff --git a/packages/chopsticks/src/plugins/trace-transaction/utils.ts b/packages/chopsticks/src/plugins/trace-transaction/utils.ts
index 5a9eb688..7dcc8e03 100644
--- a/packages/chopsticks/src/plugins/trace-transaction/utils.ts
+++ b/packages/chopsticks/src/plugins/trace-transaction/utils.ts
@@ -1,11 +1,11 @@
-import { Block, Blockchain, RuntimeVersion, pinoLogger } from '@acala-network/chopsticks-core'
+import { Block, type Blockchain, type RuntimeVersion, pinoLogger } from '@acala-network/chopsticks-core'
 import { blake2AsHex } from '@polkadot/util-crypto'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import _ from 'lodash'
 
 import { overrideWasm } from '../../utils/override.js'
 import { opName } from './table.js'
-import { Step, TraceOutcome, registerTypes } from './types.js'
+import { type Step, type TraceOutcome, registerTypes } from './types.js'
 
 /**
  * Fetches the runtime with tracing feature from Github releases.
diff --git a/packages/chopsticks/src/rpc/index.ts b/packages/chopsticks/src/rpc/index.ts
index 6ef7a94c..346f6ba5 100644
--- a/packages/chopsticks/src/rpc/index.ts
+++ b/packages/chopsticks/src/rpc/index.ts
@@ -1,8 +1,8 @@
 import {
-  Context,
-  Handlers,
+  type Context,
+  type Handlers,
   ResponseError,
-  SubscriptionManager,
+  type SubscriptionManager,
   allHandlers as coreHandlers,
   defaultLogger,
 } from '@acala-network/chopsticks-core'
diff --git a/packages/chopsticks/src/schema/index.ts b/packages/chopsticks/src/schema/index.ts
index 678a583c..227b054e 100644
--- a/packages/chopsticks/src/schema/index.ts
+++ b/packages/chopsticks/src/schema/index.ts
@@ -1,12 +1,12 @@
 import { readFileSync } from 'node:fs'
 import { basename, extname } from 'node:path'
 import { BuildBlockMode, defaultLogger, genesisSchema, isUrl } from '@acala-network/chopsticks-core'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import axios from 'axios'
 import yaml from 'js-yaml'
 import _ from 'lodash'
-import { Options } from 'yargs'
-import { ZodNativeEnum, ZodRawShape, ZodTypeAny, z } from 'zod'
+import type { Options } from 'yargs'
+import { ZodNativeEnum, type ZodRawShape, type ZodTypeAny, z } from 'zod'
 
 export const zHex = z.custom<HexString>((val: any) => /^0x\w+$/.test(val))
 export const zHash = z.string().length(66).and(zHex)
diff --git a/packages/chopsticks/src/schema/parse.test.ts b/packages/chopsticks/src/schema/parse.test.ts
index 48a818b0..8d58ab64 100644
--- a/packages/chopsticks/src/schema/parse.test.ts
+++ b/packages/chopsticks/src/schema/parse.test.ts
@@ -8,7 +8,7 @@ import { configSchema, fetchConfig } from './index.js'
 function getAllFiles(dirPath: string) {
   const files = readdirSync(dirPath)
   const arrayOfFiles: string[] = []
-  files.forEach(function (file) {
+  files.forEach((file) => {
     arrayOfFiles.push(path.join(dirPath, '/', file))
   })
 
diff --git a/packages/chopsticks/src/server.ts b/packages/chopsticks/src/server.ts
index 27a3302a..a6f7f967 100644
--- a/packages/chopsticks/src/server.ts
+++ b/packages/chopsticks/src/server.ts
@@ -1,6 +1,6 @@
 import http from 'node:http'
-import { ResponseError, SubscriptionManager } from '@acala-network/chopsticks-core'
-import { AddressInfo, WebSocket, WebSocketServer } from 'ws'
+import { ResponseError, type SubscriptionManager } from '@acala-network/chopsticks-core'
+import { type AddressInfo, WebSocket, WebSocketServer } from 'ws'
 import { z } from 'zod'
 
 import { defaultLogger, truncate } from './logger.js'
diff --git a/packages/chopsticks/src/setup-with-server.ts b/packages/chopsticks/src/setup-with-server.ts
index 3f463b44..46e22106 100644
--- a/packages/chopsticks/src/setup-with-server.ts
+++ b/packages/chopsticks/src/setup-with-server.ts
@@ -1,7 +1,7 @@
 import { defaultLogger } from '@acala-network/chopsticks-core'
 import { setupContext } from './context.js'
 import { handler } from './rpc/index.js'
-import { Config } from './schema/index.js'
+import type { Config } from './schema/index.js'
 import { createServer } from './server.js'
 
 export const setupWithServer = async (argv: Config) => {
diff --git a/packages/chopsticks/src/utils/decoder.ts b/packages/chopsticks/src/utils/decoder.ts
index 6bef7a4a..7a995843 100644
--- a/packages/chopsticks/src/utils/decoder.ts
+++ b/packages/chopsticks/src/utils/decoder.ts
@@ -1,5 +1,5 @@
-import { Block, decodeBlockStorageDiff } from '@acala-network/chopsticks-core'
-import { HexString } from '@polkadot/util/types'
+import { type Block, decodeBlockStorageDiff } from '@acala-network/chopsticks-core'
+import type { HexString } from '@polkadot/util/types'
 import { create } from 'jsondiffpatch'
 import _ from 'lodash'
 
diff --git a/packages/chopsticks/src/utils/fetch-storages.test.ts b/packages/chopsticks/src/utils/fetch-storages.test.ts
index 39d8565f..79a4cff0 100644
--- a/packages/chopsticks/src/utils/fetch-storages.test.ts
+++ b/packages/chopsticks/src/utils/fetch-storages.test.ts
@@ -3,13 +3,13 @@ import { resolve } from 'node:path'
 import { SqliteDatabase } from '@acala-network/chopsticks-db'
 import { ApiPromise } from '@polkadot/api'
 import { WsProvider } from '@polkadot/rpc-provider'
-import { ProviderInterface } from '@polkadot/rpc-provider/types'
+import type { ProviderInterface } from '@polkadot/rpc-provider/types'
 import { xxhashAsHex } from '@polkadot/util-crypto'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { Like } from 'typeorm'
 import { afterAll, beforeAll, describe, expect, it } from 'vitest'
 
-import { FetchStorageConfig, fetchStorages, getPrefixesFromConfig } from './fetch-storages.js'
+import { type FetchStorageConfig, fetchStorages, getPrefixesFromConfig } from './fetch-storages.js'
 
 describe('fetch-storages', () => {
   let api: ApiPromise
diff --git a/packages/chopsticks/src/utils/fetch-storages.ts b/packages/chopsticks/src/utils/fetch-storages.ts
index bad1604f..4d2ba6fa 100644
--- a/packages/chopsticks/src/utils/fetch-storages.ts
+++ b/packages/chopsticks/src/utils/fetch-storages.ts
@@ -4,12 +4,12 @@ import { SqliteDatabase } from '@acala-network/chopsticks-db'
 import { ApiPromise } from '@polkadot/api'
 import { WsProvider } from '@polkadot/rpc-provider'
 import { expandMetadata } from '@polkadot/types'
-import { StorageEntryMetadataLatest } from '@polkadot/types/interfaces'
-import { DecoratedMeta, ModuleStorage } from '@polkadot/types/metadata/decorate/types'
-import { StorageEntry } from '@polkadot/types/primitive/types'
+import type { StorageEntryMetadataLatest } from '@polkadot/types/interfaces'
+import type { DecoratedMeta, ModuleStorage } from '@polkadot/types/metadata/decorate/types'
+import type { StorageEntry } from '@polkadot/types/primitive/types'
 import { compactStripLength, stringCamelCase, u8aToHex } from '@polkadot/util'
 import { xxhashAsHex } from '@polkadot/util-crypto'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { releaseProxy, wrap } from 'comlink'
 import nodeEndpoint from 'comlink/dist/umd/node-adapter.js'
 import _ from 'lodash'
diff --git a/packages/chopsticks/src/utils/generate-html-diff.ts b/packages/chopsticks/src/utils/generate-html-diff.ts
index d7e465b5..43fb3c84 100644
--- a/packages/chopsticks/src/utils/generate-html-diff.ts
+++ b/packages/chopsticks/src/utils/generate-html-diff.ts
@@ -1,6 +1,6 @@
 import { mkdirSync, readFileSync, writeFileSync } from 'node:fs'
-import { Block } from '@acala-network/chopsticks-core'
-import { HexString } from '@polkadot/util/types'
+import type { Block } from '@acala-network/chopsticks-core'
+import type { HexString } from '@polkadot/util/types'
 import _ from 'lodash'
 import { decodeStorageDiff } from './decoder.js'
 
diff --git a/packages/chopsticks/src/utils/override.ts b/packages/chopsticks/src/utils/override.ts
index 559f0f5d..98537850 100644
--- a/packages/chopsticks/src/utils/override.ts
+++ b/packages/chopsticks/src/utils/override.ts
@@ -1,6 +1,6 @@
 import { existsSync, readFileSync } from 'node:fs'
-import { Blockchain, StorageValues, isUrl, setStorage } from '@acala-network/chopsticks-core'
-import { HexString } from '@polkadot/util/types'
+import { type Blockchain, type StorageValues, isUrl, setStorage } from '@acala-network/chopsticks-core'
+import type { HexString } from '@polkadot/util/types'
 import axios from 'axios'
 import yaml from 'js-yaml'
 
diff --git a/packages/core/src/api.ts b/packages/core/src/api.ts
index adc25f2f..cf7d2361 100644
--- a/packages/core/src/api.ts
+++ b/packages/core/src/api.ts
@@ -1,9 +1,9 @@
-import { ProviderInterface, ProviderInterfaceCallback } from '@polkadot/rpc-provider/types'
-import { ExtDef } from '@polkadot/types/extrinsic/signedExtensions/types'
-import { HexString } from '@polkadot/util/types'
+import type { ProviderInterface, ProviderInterfaceCallback } from '@polkadot/rpc-provider/types'
+import type { ExtDef } from '@polkadot/types/extrinsic/signedExtensions/types'
+import type { HexString } from '@polkadot/util/types'
 import _ from 'lodash'
 
-import { ChainProperties, Header, SignedBlock } from './index.js'
+import type { ChainProperties, Header, SignedBlock } from './index.js'
 import { prefixedChildKey, splitChildKey, stripChildPrefix } from './utils/index.js'
 
 /**
diff --git a/packages/core/src/blockchain/block-builder.ts b/packages/core/src/blockchain/block-builder.ts
index 8e114e0c..65820b01 100644
--- a/packages/core/src/blockchain/block-builder.ts
+++ b/packages/core/src/blockchain/block-builder.ts
@@ -1,5 +1,5 @@
-import { GenericExtrinsic } from '@polkadot/types'
-import {
+import type { GenericExtrinsic } from '@polkadot/types'
+import type {
   AccountInfo,
   ApplyExtrinsicResult,
   Call,
@@ -11,14 +11,14 @@ import {
 } from '@polkadot/types/interfaces'
 import { compactAddLength, hexToU8a, stringToHex, u8aConcat } from '@polkadot/util'
 import { blake2AsU8a } from '@polkadot/util-crypto'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { defaultLogger, truncate } from '../logger.js'
 import { compactHex, getCurrentSlot } from '../utils/index.js'
-import { TaskCallResponse } from '../wasm-executor/index.js'
+import type { TaskCallResponse } from '../wasm-executor/index.js'
 import { Block } from './block.js'
-import { InherentProvider } from './inherent/index.js'
+import type { InherentProvider } from './inherent/index.js'
 import { StorageLayer, StorageValueKind } from './storage-layer.js'
-import { BuildBlockParams } from './txpool.js'
+import type { BuildBlockParams } from './txpool.js'
 
 const logger = defaultLogger.child({ name: 'block-builder' })
 
diff --git a/packages/core/src/blockchain/block.ts b/packages/core/src/blockchain/block.ts
index e14ce5d1..984c9e10 100644
--- a/packages/core/src/blockchain/block.ts
+++ b/packages/core/src/blockchain/block.ts
@@ -1,20 +1,20 @@
-import { Metadata, TypeRegistry } from '@polkadot/types'
-import { Header } from '@polkadot/types/interfaces'
+import { Metadata, type TypeRegistry } from '@polkadot/types'
+import type { Header } from '@polkadot/types/interfaces'
 import { expandMetadata } from '@polkadot/types/metadata'
-import { DecoratedMeta } from '@polkadot/types/metadata/decorate/types'
-import { StorageEntry } from '@polkadot/types/primitive/types'
+import type { DecoratedMeta } from '@polkadot/types/metadata/decorate/types'
+import type { StorageEntry } from '@polkadot/types/primitive/types'
 import { hexToU8a, stringToHex } from '@polkadot/util'
 import type { HexString } from '@polkadot/util/types'
 
 import { compactHex } from '../utils/index.js'
 import { getRuntimeVersion, runTask, taskHandler } from '../wasm-executor/index.js'
 import type { RuntimeVersion, TaskCallResponse } from '../wasm-executor/index.js'
-import { Blockchain } from './index.js'
+import type { Blockchain } from './index.js'
 import {
   RemoteStorageLayer,
   StorageLayer,
-  StorageLayerProvider,
-  StorageValue,
+  type StorageLayerProvider,
+  type StorageValue,
   StorageValueKind,
 } from './storage-layer.js'
 
diff --git a/packages/core/src/blockchain/get-keys-paged.test.ts b/packages/core/src/blockchain/get-keys-paged.test.ts
index 3a038a5f..767b02fc 100644
--- a/packages/core/src/blockchain/get-keys-paged.test.ts
+++ b/packages/core/src/blockchain/get-keys-paged.test.ts
@@ -1,7 +1,7 @@
 import _ from 'lodash'
 import { describe, expect, it, vi } from 'vitest'
 import { Api } from '../api.js'
-import { RemoteStorageLayer, StorageLayer, StorageValue, StorageValueKind } from './storage-layer.js'
+import { RemoteStorageLayer, StorageLayer, type StorageValue, StorageValueKind } from './storage-layer.js'
 
 describe('getKeysPaged', () => {
   const hash = '0x1111111111111111111111111111111111111111111111111111111111111111'
@@ -462,7 +462,7 @@ describe('getKeysPaged', () => {
     }
 
     const allKeys = pages
-      .flatMap((x) => x)
+      .flat()
       .reduce((acc, x) => {
         if (acc.includes(x)) {
           return acc
diff --git a/packages/core/src/blockchain/head-state.ts b/packages/core/src/blockchain/head-state.ts
index 5e3db26b..3bbcae2b 100644
--- a/packages/core/src/blockchain/head-state.ts
+++ b/packages/core/src/blockchain/head-state.ts
@@ -1,5 +1,5 @@
 import { defaultLogger } from '../logger.js'
-import { Block } from './block.js'
+import type { Block } from './block.js'
 
 type Callback = (block: Block, pairs: [string, string | null][]) => void | Promise<void>
 
diff --git a/packages/core/src/blockchain/index.ts b/packages/core/src/blockchain/index.ts
index 505cfb76..46a53cce 100644
--- a/packages/core/src/blockchain/index.ts
+++ b/packages/core/src/blockchain/index.ts
@@ -1,26 +1,32 @@
 import { Metadata, TypeRegistry } from '@polkadot/types'
 import { getSpecExtensions, getSpecHasher, getSpecTypes } from '@polkadot/types-known/util'
 import type { ExtDef } from '@polkadot/types/extrinsic/signedExtensions/types'
-import { ApplyExtrinsicResult, ChainProperties, Header } from '@polkadot/types/interfaces'
+import type { ApplyExtrinsicResult, ChainProperties, Header } from '@polkadot/types/interfaces'
 import type { TransactionValidity } from '@polkadot/types/interfaces/txqueue'
-import { RegisteredTypes } from '@polkadot/types/types'
+import type { RegisteredTypes } from '@polkadot/types/types'
 import { objectSpread, u8aConcat, u8aToHex } from '@polkadot/util'
 import { blake2AsHex, xxhashAsHex } from '@polkadot/util-crypto'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import _ from 'lodash'
 
-import { Api } from '../api.js'
-import { Database } from '../database.js'
+import type { Api } from '../api.js'
+import type { Database } from '../database.js'
 import { defaultLogger } from '../logger.js'
 import { OffchainWorker } from '../offchain.js'
 import { compactHex } from '../utils/index.js'
-import { RuntimeVersion } from '../wasm-executor/index.js'
+import type { RuntimeVersion } from '../wasm-executor/index.js'
 import { dryRunExtrinsic, dryRunInherents } from './block-builder.js'
 import { Block } from './block.js'
 import { HeadState } from './head-state.js'
-import { InherentProvider } from './inherent/index.js'
-import { StorageValue } from './storage-layer.js'
-import { BuildBlockMode, BuildBlockParams, DownwardMessage, HorizontalMessage, TxPool } from './txpool.js'
+import type { InherentProvider } from './inherent/index.js'
+import type { StorageValue } from './storage-layer.js'
+import {
+  type BuildBlockMode,
+  type BuildBlockParams,
+  type DownwardMessage,
+  type HorizontalMessage,
+  TxPool,
+} from './txpool.js'
 
 const logger = defaultLogger.child({ name: 'blockchain' })
 
diff --git a/packages/core/src/blockchain/inherent/index.ts b/packages/core/src/blockchain/inherent/index.ts
index c4d3bee4..48d8a2e0 100644
--- a/packages/core/src/blockchain/inherent/index.ts
+++ b/packages/core/src/blockchain/inherent/index.ts
@@ -1,6 +1,6 @@
-import { HexString } from '@polkadot/util/types'
-import { Block } from '../block.js'
-import { BuildBlockParams } from '../txpool.js'
+import type { HexString } from '@polkadot/util/types'
+import type { Block } from '../block.js'
+import type { BuildBlockParams } from '../txpool.js'
 import { ParaInherentEnter } from './para-enter.js'
 import { SetBabeRandomness } from './parachain/babe-randomness.js'
 import { SetNimbusAuthorInherent } from './parachain/nimbus-author-inherent.js'
diff --git a/packages/core/src/blockchain/inherent/para-enter.ts b/packages/core/src/blockchain/inherent/para-enter.ts
index 0b8cfda4..eb47746c 100644
--- a/packages/core/src/blockchain/inherent/para-enter.ts
+++ b/packages/core/src/blockchain/inherent/para-enter.ts
@@ -1,9 +1,9 @@
 import { GenericExtrinsic } from '@polkadot/types'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
-import { Block } from '../block.js'
-import { BuildBlockParams } from '../txpool.js'
-import { InherentProvider } from './index.js'
+import type { Block } from '../block.js'
+import type { BuildBlockParams } from '../txpool.js'
+import type { InherentProvider } from './index.js'
 
 export class ParaInherentEnter implements InherentProvider {
   async createInherents(newBlock: Block, _params: BuildBlockParams): Promise<HexString[]> {
diff --git a/packages/core/src/blockchain/inherent/parachain/babe-randomness.ts b/packages/core/src/blockchain/inherent/parachain/babe-randomness.ts
index e21c07b9..5af572cc 100644
--- a/packages/core/src/blockchain/inherent/parachain/babe-randomness.ts
+++ b/packages/core/src/blockchain/inherent/parachain/babe-randomness.ts
@@ -1,9 +1,9 @@
 import { GenericExtrinsic } from '@polkadot/types'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
-import { Block } from '../../block.js'
-import { BuildBlockParams } from '../../txpool.js'
-import { InherentProvider } from '../index.js'
+import type { Block } from '../../block.js'
+import type { BuildBlockParams } from '../../txpool.js'
+import type { InherentProvider } from '../index.js'
 
 // Support for Moonbeam pallet-randomness mandatory inherent
 export class SetBabeRandomness implements InherentProvider {
diff --git a/packages/core/src/blockchain/inherent/parachain/nimbus-author-inherent.ts b/packages/core/src/blockchain/inherent/parachain/nimbus-author-inherent.ts
index 34fcabcb..373c1632 100644
--- a/packages/core/src/blockchain/inherent/parachain/nimbus-author-inherent.ts
+++ b/packages/core/src/blockchain/inherent/parachain/nimbus-author-inherent.ts
@@ -1,9 +1,9 @@
 import { GenericExtrinsic } from '@polkadot/types'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { compactHex } from '../../../utils/index.js'
-import { Block } from '../../block.js'
-import { BuildBlockParams } from '../../txpool.js'
-import { InherentProvider } from '../index.js'
+import type { Block } from '../../block.js'
+import type { BuildBlockParams } from '../../txpool.js'
+import type { InherentProvider } from '../index.js'
 // Support for Nimbus Author Inherent
 export class SetNimbusAuthorInherent implements InherentProvider {
   async createInherents(newBlock: Block, _params: BuildBlockParams): Promise<HexString[]> {
diff --git a/packages/core/src/blockchain/inherent/parachain/validation-data.ts b/packages/core/src/blockchain/inherent/parachain/validation-data.ts
index 038b9514..5806c6cb 100644
--- a/packages/core/src/blockchain/inherent/parachain/validation-data.ts
+++ b/packages/core/src/blockchain/inherent/parachain/validation-data.ts
@@ -1,7 +1,7 @@
 import { GenericExtrinsic } from '@polkadot/types'
-import { AbridgedHrmpChannel, HrmpChannelId, Slot } from '@polkadot/types/interfaces'
-import { BN, hexToU8a, u8aConcat, u8aToHex } from '@polkadot/util'
-import { HexString } from '@polkadot/util/types'
+import type { AbridgedHrmpChannel, HrmpChannelId, Slot } from '@polkadot/types/interfaces'
+import { type BN, hexToU8a, u8aConcat, u8aToHex } from '@polkadot/util'
+import type { HexString } from '@polkadot/util/types'
 import _ from 'lodash'
 
 import { blake2AsHex, blake2AsU8a } from '@polkadot/util-crypto'
@@ -16,9 +16,9 @@ import {
   upgradeGoAheadSignal,
 } from '../../../utils/proof.js'
 import { createProof, decodeProof } from '../../../wasm-executor/index.js'
-import { Block } from '../../block.js'
-import { BuildBlockParams, DownwardMessage, HorizontalMessage } from '../../txpool.js'
-import { InherentProvider } from '../index.js'
+import type { Block } from '../../block.js'
+import type { BuildBlockParams, DownwardMessage, HorizontalMessage } from '../../txpool.js'
+import type { InherentProvider } from '../index.js'
 
 const MOCK_VALIDATION_DATA = {
   validationData: {
diff --git a/packages/core/src/blockchain/inherent/timestamp.ts b/packages/core/src/blockchain/inherent/timestamp.ts
index 27f256ef..ea665c5b 100644
--- a/packages/core/src/blockchain/inherent/timestamp.ts
+++ b/packages/core/src/blockchain/inherent/timestamp.ts
@@ -1,8 +1,8 @@
 import { GenericExtrinsic } from '@polkadot/types'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { getCurrentTimestamp, getSlotDuration } from '../../utils/index.js'
-import { Block } from '../block.js'
-import { InherentProvider } from './index.js'
+import type { Block } from '../block.js'
+import type { InherentProvider } from './index.js'
 
 export class SetTimestamp implements InherentProvider {
   async createInherents(newBlock: Block): Promise<HexString[]> {
diff --git a/packages/core/src/blockchain/storage-layer.ts b/packages/core/src/blockchain/storage-layer.ts
index 0e88333f..26d2110d 100644
--- a/packages/core/src/blockchain/storage-layer.ts
+++ b/packages/core/src/blockchain/storage-layer.ts
@@ -1,8 +1,8 @@
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import _ from 'lodash'
 
-import { Api } from '../api.js'
-import { Database } from '../database.js'
+import type { Api } from '../api.js'
+import type { Database } from '../database.js'
 import { defaultLogger } from '../logger.js'
 import { CHILD_PREFIX_LENGTH, PREFIX_LENGTH, isPrefixedChildKey } from '../utils/index.js'
 import KeyCache from '../utils/key-cache.js'
@@ -11,7 +11,7 @@ const logger = defaultLogger.child({ name: 'layer' })
 
 const BATCH_SIZE = 1000
 
-export const enum StorageValueKind {
+export enum StorageValueKind {
   Deleted = 'Deleted',
   DeletedPrefix = 'DeletedPrefix',
 }
diff --git a/packages/core/src/blockchain/txpool.ts b/packages/core/src/blockchain/txpool.ts
index 24834e94..8f9f8835 100644
--- a/packages/core/src/blockchain/txpool.ts
+++ b/packages/core/src/blockchain/txpool.ts
@@ -1,14 +1,14 @@
-import { GenericExtrinsic } from '@polkadot/types'
+import type { GenericExtrinsic } from '@polkadot/types'
 import { hexToU8a } from '@polkadot/util/hex/toU8a'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { EventEmitter } from 'eventemitter3'
 import _ from 'lodash'
 
 import { defaultLogger, truncate } from '../logger.js'
-import { Deferred, defer } from '../utils/index.js'
+import { type Deferred, defer } from '../utils/index.js'
 import { buildBlock } from './block-builder.js'
-import { Blockchain } from './index.js'
-import { InherentProvider } from './inherent/index.js'
+import type { Blockchain } from './index.js'
+import type { InherentProvider } from './inherent/index.js'
 
 const logger = defaultLogger.child({ name: 'txpool' })
 
diff --git a/packages/core/src/chopsticks-provider.ts b/packages/core/src/chopsticks-provider.ts
index 638afa58..fd4c78ca 100644
--- a/packages/core/src/chopsticks-provider.ts
+++ b/packages/core/src/chopsticks-provider.ts
@@ -1,4 +1,4 @@
-import {
+import type {
   ProviderInterface,
   ProviderInterfaceCallback,
   ProviderInterfaceEmitCb,
@@ -6,10 +6,10 @@ import {
 } from '@polkadot/rpc-provider/types'
 import { EventEmitter } from 'eventemitter3'
 
-import { Blockchain } from './blockchain/index.js'
-import { Database } from './database.js'
+import type { Blockchain } from './blockchain/index.js'
+import type { Database } from './database.js'
 import { defaultLogger } from './logger.js'
-import { Handlers, allHandlers } from './rpc/index.js'
+import { type Handlers, allHandlers } from './rpc/index.js'
 import { setup } from './setup.js'
 
 const providerHandlers: Handlers = {
diff --git a/packages/core/src/database.ts b/packages/core/src/database.ts
index 29a0338c..c6329316 100644
--- a/packages/core/src/database.ts
+++ b/packages/core/src/database.ts
@@ -1,4 +1,4 @@
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
 export interface BlockEntry {
   hash: HexString
diff --git a/packages/core/src/genesis-provider.ts b/packages/core/src/genesis-provider.ts
index 146f5abc..fbb7deba 100644
--- a/packages/core/src/genesis-provider.ts
+++ b/packages/core/src/genesis-provider.ts
@@ -1,15 +1,15 @@
-import {
+import type {
   ProviderInterface,
   ProviderInterfaceCallback,
   ProviderInterfaceEmitCb,
   ProviderInterfaceEmitted,
 } from '@polkadot/rpc-provider/types'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { EventEmitter } from 'eventemitter3'
 
 import { defaultLogger, isPrefixedChildKey } from './index.js'
-import { Genesis, genesisSchema } from './schema/index.js'
-import { JsCallback, calculateStateRoot, emptyTaskHandler } from './wasm-executor/index.js'
+import { type Genesis, genesisSchema } from './schema/index.js'
+import { type JsCallback, calculateStateRoot, emptyTaskHandler } from './wasm-executor/index.js'
 
 /**
  * Provider to start a chain from genesis
@@ -121,14 +121,14 @@ export class GenesisProvider implements ProviderInterface {
     const storage = this.#genesis.genesis.raw.top
     return {
       ...emptyTaskHandler,
-      getStorage: async function (key: HexString) {
+      getStorage: async (key: HexString) => {
         if (isPrefixedChildKey(key)) {
           defaultLogger.warn({ key }, 'genesis child storage not supported')
           return undefined
         }
         return storage[key]
       },
-      getNextKey: async function (prefix: HexString, key: HexString) {
+      getNextKey: async (prefix: HexString, key: HexString) => {
         if (isPrefixedChildKey(key)) {
           defaultLogger.warn({ prefix, key }, 'genesis child storage not supported')
           return undefined
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index c1e70f49..9c9519e3 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -8,7 +8,7 @@
  * @packageDocumentation
  */
 
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
 export type ChainProperties = {
   ss58Format?: number
diff --git a/packages/core/src/offchain.ts b/packages/core/src/offchain.ts
index b7514e24..d9300d2e 100644
--- a/packages/core/src/offchain.ts
+++ b/packages/core/src/offchain.ts
@@ -1,7 +1,7 @@
 import { blake2AsHex } from '@polkadot/util-crypto'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { queueScheduler } from 'rxjs'
-import { Block } from './blockchain/block.js'
+import type { Block } from './blockchain/block.js'
 import { defaultLogger } from './logger.js'
 
 const logger = defaultLogger.child({ name: 'offchain' })
diff --git a/packages/core/src/rpc/dev/new-block.ts b/packages/core/src/rpc/dev/new-block.ts
index c62df8ee..1307fc7a 100644
--- a/packages/core/src/rpc/dev/new-block.ts
+++ b/packages/core/src/rpc/dev/new-block.ts
@@ -1,6 +1,6 @@
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { z } from 'zod'
-import { Context, ResponseError, zHex } from '../shared.js'
+import { type Context, ResponseError, zHex } from '../shared.js'
 
 import { defaultLogger } from '../../logger.js'
 
diff --git a/packages/core/src/rpc/dev/set-block-build-mode.ts b/packages/core/src/rpc/dev/set-block-build-mode.ts
index a924fc0a..8110d161 100644
--- a/packages/core/src/rpc/dev/set-block-build-mode.ts
+++ b/packages/core/src/rpc/dev/set-block-build-mode.ts
@@ -1,6 +1,6 @@
 import { BuildBlockMode } from '../../blockchain/txpool.js'
 import { defaultLogger } from '../../logger.js'
-import { Context, ResponseError } from '../shared.js'
+import { type Context, ResponseError } from '../shared.js'
 
 /**
  * Set block build mode.
diff --git a/packages/core/src/rpc/dev/set-head.ts b/packages/core/src/rpc/dev/set-head.ts
index 0485ee98..05a50834 100644
--- a/packages/core/src/rpc/dev/set-head.ts
+++ b/packages/core/src/rpc/dev/set-head.ts
@@ -1,6 +1,6 @@
 import { z } from 'zod'
-import { Block } from '../../blockchain/block.js'
-import { Context, ResponseError, zHash } from '../shared.js'
+import type { Block } from '../../blockchain/block.js'
+import { type Context, ResponseError, zHash } from '../shared.js'
 
 const schema = zHash.or(z.number())
 type Params = z.infer<typeof schema>
diff --git a/packages/core/src/rpc/dev/set-runtime-log-level.ts b/packages/core/src/rpc/dev/set-runtime-log-level.ts
index ea0babb8..c36b8af6 100644
--- a/packages/core/src/rpc/dev/set-runtime-log-level.ts
+++ b/packages/core/src/rpc/dev/set-runtime-log-level.ts
@@ -1,5 +1,5 @@
 import { defaultLogger } from '../../logger.js'
-import { Context, ResponseError } from '../shared.js'
+import { type Context, ResponseError } from '../shared.js'
 
 /**
  * Set runtime log level.
diff --git a/packages/core/src/rpc/dev/set-storage.ts b/packages/core/src/rpc/dev/set-storage.ts
index 9b51e5b6..01a38369 100644
--- a/packages/core/src/rpc/dev/set-storage.ts
+++ b/packages/core/src/rpc/dev/set-storage.ts
@@ -1,8 +1,8 @@
-import { HexString } from '@polkadot/util/types'
-import { Context, ResponseError } from '../shared.js'
+import type { HexString } from '@polkadot/util/types'
+import { type Context, ResponseError } from '../shared.js'
 
 import { defaultLogger } from '../../logger.js'
-import { StorageValues, setStorage } from '../../utils/set-storage.js'
+import { type StorageValues, setStorage } from '../../utils/set-storage.js'
 
 /**
  * Set storage values.
diff --git a/packages/core/src/rpc/dev/time-travel.ts b/packages/core/src/rpc/dev/time-travel.ts
index 040a2cce..ad7cbc44 100644
--- a/packages/core/src/rpc/dev/time-travel.ts
+++ b/packages/core/src/rpc/dev/time-travel.ts
@@ -1,5 +1,5 @@
 import { timeTravel } from '../../utils/time-travel.js'
-import { Context, ResponseError } from '../shared.js'
+import { type Context, ResponseError } from '../shared.js'
 
 /**
  * Travel to a specific time.
diff --git a/packages/core/src/rpc/index.ts b/packages/core/src/rpc/index.ts
index 64f11af3..512a9ec0 100644
--- a/packages/core/src/rpc/index.ts
+++ b/packages/core/src/rpc/index.ts
@@ -1,6 +1,6 @@
 import dev from './dev/index.js'
 import rpcSpec from './rpc-spec/index.js'
-import { Handlers } from './shared.js'
+import type { Handlers } from './shared.js'
 import substrate from './substrate/index.js'
 
 export const allHandlers: Handlers = {
diff --git a/packages/core/src/rpc/rpc-spec/chainHead_v1.ts b/packages/core/src/rpc/rpc-spec/chainHead_v1.ts
index c736a2d5..0067656b 100644
--- a/packages/core/src/rpc/rpc-spec/chainHead_v1.ts
+++ b/packages/core/src/rpc/rpc-spec/chainHead_v1.ts
@@ -1,7 +1,7 @@
-import { HexString } from '@polkadot/util/types'
-import { Block } from '../../blockchain/block.js'
+import type { HexString } from '@polkadot/util/types'
+import type { Block } from '../../blockchain/block.js'
 import { defaultLogger } from '../../logger.js'
-import { Handler, ResponseError, SubscriptionManager } from '../shared.js'
+import { type Handler, ResponseError, type SubscriptionManager } from '../shared.js'
 
 const logger = defaultLogger.child({ name: 'rpc-chainHead_v1' })
 
diff --git a/packages/core/src/rpc/rpc-spec/chainSpec_v1.ts b/packages/core/src/rpc/rpc-spec/chainSpec_v1.ts
index 0e86d861..4b6cc965 100644
--- a/packages/core/src/rpc/rpc-spec/chainSpec_v1.ts
+++ b/packages/core/src/rpc/rpc-spec/chainSpec_v1.ts
@@ -1,6 +1,6 @@
-import { HexString } from '@polkadot/util/types'
-import { ChainProperties } from '../../index.js'
-import { Handler, ResponseError } from '../shared.js'
+import type { HexString } from '@polkadot/util/types'
+import type { ChainProperties } from '../../index.js'
+import { type Handler, ResponseError } from '../shared.js'
 
 export const chainSpec_v1_chainName: Handler<[], string> = async (context) => {
   return context.chain.api.getSystemChain()
diff --git a/packages/core/src/rpc/rpc-spec/transaction_v1.ts b/packages/core/src/rpc/rpc-spec/transaction_v1.ts
index 37df89d5..e5aa89ee 100644
--- a/packages/core/src/rpc/rpc-spec/transaction_v1.ts
+++ b/packages/core/src/rpc/rpc-spec/transaction_v1.ts
@@ -1,6 +1,6 @@
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { defaultLogger } from '../../logger.js'
-import { Handler } from '../shared.js'
+import type { Handler } from '../shared.js'
 
 const logger = defaultLogger.child({ name: 'rpc-transaction_v1' })
 const randomId = () => Math.random().toString(36).substring(2)
diff --git a/packages/core/src/rpc/shared.ts b/packages/core/src/rpc/shared.ts
index cd8bf8f9..32de0cb9 100644
--- a/packages/core/src/rpc/shared.ts
+++ b/packages/core/src/rpc/shared.ts
@@ -1,7 +1,7 @@
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { z } from 'zod'
 
-import { Blockchain } from '../blockchain/index.js'
+import type { Blockchain } from '../blockchain/index.js'
 import { defaultLogger } from '../logger.js'
 
 export const logger = defaultLogger.child({ name: 'rpc' })
diff --git a/packages/core/src/rpc/substrate/archive.ts b/packages/core/src/rpc/substrate/archive.ts
index c9b4ffa2..f71749a4 100644
--- a/packages/core/src/rpc/substrate/archive.ts
+++ b/packages/core/src/rpc/substrate/archive.ts
@@ -1,6 +1,6 @@
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
-import { Handler, ResponseError } from '../shared.js'
+import { type Handler, ResponseError } from '../shared.js'
 import { chain_getBlockHash } from './chain.js'
 import { state_call } from './state.js'
 
diff --git a/packages/core/src/rpc/substrate/author.ts b/packages/core/src/rpc/substrate/author.ts
index 99e415df..8045d0cd 100644
--- a/packages/core/src/rpc/substrate/author.ts
+++ b/packages/core/src/rpc/substrate/author.ts
@@ -1,10 +1,10 @@
-import { TransactionValidityError } from '@polkadot/types/interfaces'
-import { HexString } from '@polkadot/util/types'
+import type { TransactionValidityError } from '@polkadot/types/interfaces'
+import type { HexString } from '@polkadot/util/types'
 
-import { Block } from '../../blockchain/block.js'
+import type { Block } from '../../blockchain/block.js'
 import { APPLY_EXTRINSIC_ERROR } from '../../blockchain/txpool.js'
 import { defaultLogger } from '../../logger.js'
-import { Handler, ResponseError, SubscriptionManager } from '../shared.js'
+import { type Handler, ResponseError, type SubscriptionManager } from '../shared.js'
 
 const logger = defaultLogger.child({ name: 'rpc-author' })
 
diff --git a/packages/core/src/rpc/substrate/chain.ts b/packages/core/src/rpc/substrate/chain.ts
index 73e6a359..925f1a0c 100644
--- a/packages/core/src/rpc/substrate/chain.ts
+++ b/packages/core/src/rpc/substrate/chain.ts
@@ -1,9 +1,9 @@
-import { Header as CodecHeader } from '@polkadot/types/interfaces'
+import type { Header as CodecHeader } from '@polkadot/types/interfaces'
 import { hexToNumber, isHex } from '@polkadot/util'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
 import type { Header } from '../../index.js'
-import { Handler, ResponseError } from '../shared.js'
+import { type Handler, ResponseError } from '../shared.js'
 
 const processHeader = ({ parentHash, number, stateRoot, extrinsicsRoot, digest }: CodecHeader) => {
   return {
diff --git a/packages/core/src/rpc/substrate/payment.ts b/packages/core/src/rpc/substrate/payment.ts
index 3f881ab4..8a4146a6 100644
--- a/packages/core/src/rpc/substrate/payment.ts
+++ b/packages/core/src/rpc/substrate/payment.ts
@@ -1,7 +1,7 @@
 import { hexToU8a } from '@polkadot/util'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
-import { Handler, ResponseError } from '../shared.js'
+import { type Handler, ResponseError } from '../shared.js'
 
 /**
  * @param context
diff --git a/packages/core/src/rpc/substrate/state.ts b/packages/core/src/rpc/substrate/state.ts
index aab251d4..1d25c2ae 100644
--- a/packages/core/src/rpc/substrate/state.ts
+++ b/packages/core/src/rpc/substrate/state.ts
@@ -1,11 +1,11 @@
 import { stringToHex } from '@polkadot/util'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
-import { Block } from '../../blockchain/block.js'
+import type { Block } from '../../blockchain/block.js'
 import { defaultLogger } from '../../logger.js'
 import { isPrefixedChildKey, prefixedChildKey, stripChildPrefix } from '../../utils/index.js'
-import { RuntimeVersion } from '../../wasm-executor/index.js'
-import { Handler, ResponseError } from '../shared.js'
+import type { RuntimeVersion } from '../../wasm-executor/index.js'
+import { type Handler, ResponseError } from '../shared.js'
 
 const logger = defaultLogger.child({ name: 'rpc-state' })
 
diff --git a/packages/core/src/rpc/substrate/system.ts b/packages/core/src/rpc/substrate/system.ts
index 3a3d67b4..668cce44 100644
--- a/packages/core/src/rpc/substrate/system.ts
+++ b/packages/core/src/rpc/substrate/system.ts
@@ -1,9 +1,9 @@
-import { Index } from '@polkadot/types/interfaces'
+import type { Index } from '@polkadot/types/interfaces'
 import { hexToU8a } from '@polkadot/util'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
-import { ChainProperties } from '../../index.js'
-import { Handler } from '../shared.js'
+import type { ChainProperties } from '../../index.js'
+import type { Handler } from '../shared.js'
 
 export const system_localPeerId = async () => '5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY'
 export const system_nodeRoles = async () => ['Full']
diff --git a/packages/core/src/setup.ts b/packages/core/src/setup.ts
index b1f3166a..ba81dc1c 100644
--- a/packages/core/src/setup.ts
+++ b/packages/core/src/setup.ts
@@ -1,15 +1,15 @@
 import '@polkadot/types-codec'
 import { HttpProvider, WsProvider } from '@polkadot/rpc-provider'
-import { ProviderInterface } from '@polkadot/rpc-provider/types'
-import { RegisteredTypes } from '@polkadot/types/types'
-import { HexString } from '@polkadot/util/types'
+import type { ProviderInterface } from '@polkadot/rpc-provider/types'
+import type { RegisteredTypes } from '@polkadot/types/types'
+import type { HexString } from '@polkadot/util/types'
 
 import { Api } from './api.js'
 import { Blockchain } from './blockchain/index.js'
 import { inherentProviders } from './blockchain/inherent/index.js'
-import { BuildBlockMode } from './blockchain/txpool.js'
-import { Database } from './database.js'
-import { GenesisProvider } from './genesis-provider.js'
+import type { BuildBlockMode } from './blockchain/txpool.js'
+import type { Database } from './database.js'
+import type { GenesisProvider } from './genesis-provider.js'
 import { defaultLogger } from './logger.js'
 
 export type SetupOptions = {
diff --git a/packages/core/src/utils/decoder.ts b/packages/core/src/utils/decoder.ts
index 5597c6f9..984e62f7 100644
--- a/packages/core/src/utils/decoder.ts
+++ b/packages/core/src/utils/decoder.ts
@@ -1,13 +1,13 @@
 import '@polkadot/types-codec'
-import { StorageKey } from '@polkadot/types'
-import { Registry } from '@polkadot/types-codec/types'
-import { DecoratedMeta } from '@polkadot/types/metadata/decorate/types'
-import { StorageEntry } from '@polkadot/types/primitive/types'
+import type { StorageKey } from '@polkadot/types'
+import type { Registry } from '@polkadot/types-codec/types'
+import type { DecoratedMeta } from '@polkadot/types/metadata/decorate/types'
+import type { StorageEntry } from '@polkadot/types/primitive/types'
 import { hexToU8a, u8aToHex } from '@polkadot/util'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import _ from 'lodash'
 import { LRUCache } from 'lru-cache'
-import { Block } from '../blockchain/block.js'
+import type { Block } from '../blockchain/block.js'
 
 import { defaultLogger } from '../logger.js'
 import { decodeWellKnownKey } from './well-known-keys.js'
diff --git a/packages/core/src/utils/index.ts b/packages/core/src/utils/index.ts
index c51caa14..6644abb0 100644
--- a/packages/core/src/utils/index.ts
+++ b/packages/core/src/utils/index.ts
@@ -1,11 +1,11 @@
-import { StorageKey } from '@polkadot/types'
-import { BN, compactStripLength, u8aToHex } from '@polkadot/util'
+import type { StorageKey } from '@polkadot/types'
+import { type BN, compactStripLength, u8aToHex } from '@polkadot/util'
 import { hexAddPrefix, hexStripPrefix } from '@polkadot/util/hex'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { getAuraSlotDuration } from '../wasm-executor/index.js'
 
-import { Block } from '../blockchain/block.js'
-import { Blockchain } from '../blockchain/index.js'
+import type { Block } from '../blockchain/block.js'
+import type { Blockchain } from '../blockchain/index.js'
 
 export * from './set-storage.js'
 export * from './time-travel.js'
diff --git a/packages/core/src/utils/key-cache.ts b/packages/core/src/utils/key-cache.ts
index c22e0d91..15d4a557 100644
--- a/packages/core/src/utils/key-cache.ts
+++ b/packages/core/src/utils/key-cache.ts
@@ -1,4 +1,4 @@
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import _ from 'lodash'
 
 export default class KeyCache {
diff --git a/packages/core/src/utils/proof.ts b/packages/core/src/utils/proof.ts
index 03879bab..ea14739d 100644
--- a/packages/core/src/utils/proof.ts
+++ b/packages/core/src/utils/proof.ts
@@ -1,8 +1,8 @@
-import { u32 } from '@polkadot/types'
-import { HrmpChannelId } from '@polkadot/types/interfaces'
+import type { u32 } from '@polkadot/types'
+import type { HrmpChannelId } from '@polkadot/types/interfaces'
 import { hexToU8a, u8aConcat, u8aToHex } from '@polkadot/util'
 import { xxhashAsU8a } from '@polkadot/util-crypto'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
 export const WELL_KNOWN_KEYS = {
   EPOCH_INDEX: '0x1cb6f36e027abb2091cfb5110ab5087f38316cbf8fa0da822a20ac1c55bf1be3' as HexString,
diff --git a/packages/core/src/utils/set-storage.ts b/packages/core/src/utils/set-storage.ts
index e1819e88..bca614bf 100644
--- a/packages/core/src/utils/set-storage.ts
+++ b/packages/core/src/utils/set-storage.ts
@@ -1,10 +1,10 @@
 import { StorageKey } from '@polkadot/types'
-import { DecoratedMeta } from '@polkadot/types/metadata/decorate/types'
+import type { DecoratedMeta } from '@polkadot/types/metadata/decorate/types'
 import { u8aToHex } from '@polkadot/util'
 import { stringCamelCase } from '@polkadot/util/string'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
-import { Blockchain } from '../blockchain/index.js'
+import type { Blockchain } from '../blockchain/index.js'
 import { StorageValueKind } from '../blockchain/storage-layer.js'
 
 type RawStorageValues = [string, string | null][]
diff --git a/packages/core/src/utils/time-travel.ts b/packages/core/src/utils/time-travel.ts
index 2b066fd4..5e12bf83 100644
--- a/packages/core/src/utils/time-travel.ts
+++ b/packages/core/src/utils/time-travel.ts
@@ -1,7 +1,7 @@
-import { BN, u8aToHex } from '@polkadot/util'
-import { HexString } from '@polkadot/util/types'
+import { type BN, u8aToHex } from '@polkadot/util'
+import type { HexString } from '@polkadot/util/types'
 
-import { Blockchain } from '../blockchain/index.js'
+import type { Blockchain } from '../blockchain/index.js'
 import { compactHex, getSlotDuration } from './index.js'
 import { setStorage } from './set-storage.js'
 
diff --git a/packages/core/src/utils/well-known-keys.ts b/packages/core/src/utils/well-known-keys.ts
index fdac53ac..d1bc69d6 100644
--- a/packages/core/src/utils/well-known-keys.ts
+++ b/packages/core/src/utils/well-known-keys.ts
@@ -1,7 +1,7 @@
-import { Registry } from '@polkadot/types-codec/types'
+import type { Registry } from '@polkadot/types-codec/types'
 import { hexToU8a, stringToHex } from '@polkadot/util'
 import { blake2AsHex } from '@polkadot/util-crypto'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
 const decodeValue = (type: string) => (registry: Registry, value: HexString) => {
   return registry.createType(type, hexToU8a(value)).toJSON()
diff --git a/packages/core/src/wasm-executor/executor.test.ts b/packages/core/src/wasm-executor/executor.test.ts
index 33125842..c3409140 100644
--- a/packages/core/src/wasm-executor/executor.test.ts
+++ b/packages/core/src/wasm-executor/executor.test.ts
@@ -1,7 +1,7 @@
 import { readFileSync } from 'node:fs'
 import path from 'node:path'
 import { TypeRegistry } from '@polkadot/types'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import * as Comlink from 'comlink'
 import _ from 'lodash'
 import { describe, expect, it } from 'vitest'
diff --git a/packages/core/src/wasm-executor/index.ts b/packages/core/src/wasm-executor/index.ts
index 38652234..895fed4d 100644
--- a/packages/core/src/wasm-executor/index.ts
+++ b/packages/core/src/wasm-executor/index.ts
@@ -1,15 +1,15 @@
 import { hexToString, hexToU8a, u8aToBn } from '@polkadot/util'
 import { randomAsHex } from '@polkadot/util-crypto'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import * as Comlink from 'comlink'
 import _ from 'lodash'
 
-import { Block } from '../blockchain/block.js'
+import type { Block } from '../blockchain/block.js'
 import { defaultLogger, truncate } from '../logger.js'
 import { PREFIX_LENGTH, stripChildPrefix } from '../utils/index.js'
 
 import type { JsCallback } from '@acala-network/chopsticks-executor'
-export { JsCallback }
+export type { JsCallback }
 
 export type RuntimeVersion = {
   specName: string
@@ -141,10 +141,8 @@ export const runTask = async (task: TaskCall, callback: JsCallback = emptyTaskHa
 
 export const taskHandler = (block: Block): JsCallback => {
   return {
-    getStorage: async function (key: HexString) {
-      return block.get(key)
-    },
-    getNextKey: async function (prefix: HexString, key: HexString) {
+    getStorage: async (key: HexString) => block.get(key),
+    getNextKey: async (prefix: HexString, key: HexString) => {
       const [nextKey] = await block.getKeysPaged({
         prefix: prefix.length === 2 /** 0x */ ? key.slice(0, PREFIX_LENGTH) : prefix,
         pageSize: 1,
@@ -152,17 +150,13 @@ export const taskHandler = (block: Block): JsCallback => {
       })
       return nextKey && stripChildPrefix(nextKey as HexString)
     },
-    offchainGetStorage: async function (key: HexString) {
+    offchainGetStorage: async (key: HexString) => {
       if (!block.chain.offchainWorker) throw new Error('offchain worker not found')
       return block.chain.offchainWorker.get(key) as string
     },
-    offchainTimestamp: async function () {
-      return Date.now()
-    },
-    offchainRandomSeed: async function () {
-      return randomAsHex(32)
-    },
-    offchainSubmitTransaction: async function (tx: HexString) {
+    offchainTimestamp: async () => Date.now(),
+    offchainRandomSeed: async () => randomAsHex(32),
+    offchainSubmitTransaction: async (tx: HexString) => {
       if (!block.chain.offchainWorker) throw new Error('offchain worker not found')
       try {
         const hash = await block.chain.offchainWorker.pushExtrinsic(block, tx)
@@ -177,22 +171,22 @@ export const taskHandler = (block: Block): JsCallback => {
 }
 
 export const emptyTaskHandler = {
-  getStorage: async function (_key: HexString) {
+  getStorage: async (_key: HexString) => {
     throw new Error('Method not implemented')
   },
-  getNextKey: async function (_prefix: HexString, _key: HexString) {
+  getNextKey: async (_prefix: HexString, _key: HexString) => {
     throw new Error('Method not implemented')
   },
-  offchainGetStorage: async function (_key: HexString) {
+  offchainGetStorage: async (_key: HexString) => {
     throw new Error('Method not implemented')
   },
-  offchainTimestamp: async function () {
+  offchainTimestamp: async () => {
     throw new Error('Method not implemented')
   },
-  offchainRandomSeed: async function () {
+  offchainRandomSeed: async () => {
     throw new Error('Method not implemented')
   },
-  offchainSubmitTransaction: async function (_tx: HexString) {
+  offchainSubmitTransaction: async (_tx: HexString) => {
     throw new Error('Method not implemented')
   },
 }
diff --git a/packages/core/src/xcm/downward.ts b/packages/core/src/xcm/downward.ts
index 7191a726..8bcb8c6c 100644
--- a/packages/core/src/xcm/downward.ts
+++ b/packages/core/src/xcm/downward.ts
@@ -1,7 +1,7 @@
 import { hexToU8a } from '@polkadot/util'
 
-import { Blockchain } from '../blockchain/index.js'
-import { DownwardMessage } from '../blockchain/txpool.js'
+import type { Blockchain } from '../blockchain/index.js'
+import type { DownwardMessage } from '../blockchain/txpool.js'
 import { compactHex, getParaId } from '../utils/index.js'
 import { setStorage } from '../utils/set-storage.js'
 import { xcmLogger } from './index.js'
diff --git a/packages/core/src/xcm/horizontal.ts b/packages/core/src/xcm/horizontal.ts
index c5d98334..1fe1ea10 100644
--- a/packages/core/src/xcm/horizontal.ts
+++ b/packages/core/src/xcm/horizontal.ts
@@ -1,7 +1,7 @@
 import { hexToU8a } from '@polkadot/util'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
-import { Blockchain } from '../blockchain/index.js'
+import type { Blockchain } from '../blockchain/index.js'
 import { compactHex } from '../utils/index.js'
 import { xcmLogger } from './index.js'
 
diff --git a/packages/core/src/xcm/index.ts b/packages/core/src/xcm/index.ts
index 60bfbd0d..7cff2790 100644
--- a/packages/core/src/xcm/index.ts
+++ b/packages/core/src/xcm/index.ts
@@ -1,4 +1,4 @@
-import { Blockchain } from '../blockchain/index.js'
+import type { Blockchain } from '../blockchain/index.js'
 import { defaultLogger } from '../logger.js'
 import { getParaId } from '../utils/index.js'
 import { connectDownward } from './downward.js'
diff --git a/packages/core/src/xcm/upward.ts b/packages/core/src/xcm/upward.ts
index 668496ac..98adb84c 100644
--- a/packages/core/src/xcm/upward.ts
+++ b/packages/core/src/xcm/upward.ts
@@ -1,6 +1,6 @@
 import { hexToU8a } from '@polkadot/util'
 
-import { Blockchain } from '../blockchain/index.js'
+import type { Blockchain } from '../blockchain/index.js'
 import { compactHex, getParaId } from '../utils/index.js'
 
 export const connectUpward = async (parachain: Blockchain, relaychain: Blockchain) => {
diff --git a/packages/db/src/base-sql.ts b/packages/db/src/base-sql.ts
index f70ef381..2b5266db 100644
--- a/packages/db/src/base-sql.ts
+++ b/packages/db/src/base-sql.ts
@@ -1,6 +1,6 @@
-import { BlockEntry, Database, KeyValueEntry } from '@acala-network/chopsticks-core'
-import { HexString } from '@polkadot/util/types'
-import { DataSource } from 'typeorm'
+import type { BlockEntry, Database, KeyValueEntry } from '@acala-network/chopsticks-core'
+import type { HexString } from '@polkadot/util/types'
+import type { DataSource } from 'typeorm'
 
 import { BlockEntity, KeyValuePair } from './db/entities.js'
 
diff --git a/packages/db/src/browser.ts b/packages/db/src/browser.ts
index 9bfdc3de..ec9f9550 100644
--- a/packages/db/src/browser.ts
+++ b/packages/db/src/browser.ts
@@ -1,5 +1,5 @@
-import { BlockEntry, Database, KeyValueEntry } from '@acala-network/chopsticks-core'
-import { DBSchema, IDBPDatabase, openDB } from 'idb'
+import type { BlockEntry, Database, KeyValueEntry } from '@acala-network/chopsticks-core'
+import { type DBSchema, type IDBPDatabase, openDB } from 'idb'
 
 interface Schema extends DBSchema {
   keyValue: {
diff --git a/packages/db/src/db/entities.ts b/packages/db/src/db/entities.ts
index dec79762..d9245554 100644
--- a/packages/db/src/db/entities.ts
+++ b/packages/db/src/db/entities.ts
@@ -1,4 +1,4 @@
-import { BlockEntry, KeyValueEntry } from '@acala-network/chopsticks-core'
+import type { BlockEntry, KeyValueEntry } from '@acala-network/chopsticks-core'
 import { EntitySchema } from 'typeorm'
 
 export const KeyValuePair = new EntitySchema<KeyValueEntry>({
diff --git a/packages/db/src/index.ts b/packages/db/src/index.ts
index 6714c622..14cb008d 100644
--- a/packages/db/src/index.ts
+++ b/packages/db/src/index.ts
@@ -1,4 +1,4 @@
-import { DataSource } from 'typeorm'
+import type { DataSource } from 'typeorm'
 
 import { BaseSqlDatabase } from './base-sql.js'
 import { openDb } from './db/index.js'
diff --git a/packages/e2e/src/author.test.ts b/packages/e2e/src/author.test.ts
index 9d6f9d92..c4242fb4 100644
--- a/packages/e2e/src/author.test.ts
+++ b/packages/e2e/src/author.test.ts
@@ -1,4 +1,4 @@
-import { SubmittableResult } from '@polkadot/api'
+import type { SubmittableResult } from '@polkadot/api'
 import { afterAll, describe, expect, it } from 'vitest'
 
 import { check, defer, mockCallback, testingPairs } from './helper.js'
diff --git a/packages/e2e/src/chainHead_v1.test.ts b/packages/e2e/src/chainHead_v1.test.ts
index c05129fe..22fc8015 100644
--- a/packages/e2e/src/chainHead_v1.test.ts
+++ b/packages/e2e/src/chainHead_v1.test.ts
@@ -1,4 +1,4 @@
-import { RuntimeContext } from '@polkadot-api/observable-client'
+import type { RuntimeContext } from '@polkadot-api/observable-client'
 import { describe, expect, it } from 'vitest'
 
 import { getPolkadotSigner } from 'polkadot-api/signer'
diff --git a/packages/e2e/src/helper.ts b/packages/e2e/src/helper.ts
index 55dae2c5..7692a216 100644
--- a/packages/e2e/src/helper.ts
+++ b/packages/e2e/src/helper.ts
@@ -1,16 +1,16 @@
 import { getObservableClient } from '@polkadot-api/observable-client'
-import { SubstrateClient, createClient as createSubstrateClient } from '@polkadot-api/substrate-client'
+import { type SubstrateClient, createClient as createSubstrateClient } from '@polkadot-api/substrate-client'
 import { getWsProvider } from '@polkadot-api/ws-provider/node'
 import { ApiPromise, HttpProvider, WsProvider } from '@polkadot/api'
-import { ProviderInterface } from '@polkadot/rpc-provider/types'
-import { RegisteredTypes } from '@polkadot/types/types'
-import { HexString } from '@polkadot/util/types'
-import { PolkadotClient, createClient } from 'polkadot-api'
-import { Observable } from 'rxjs'
-import { Mock, beforeAll, beforeEach, expect, vi } from 'vitest'
+import type { ProviderInterface } from '@polkadot/rpc-provider/types'
+import type { RegisteredTypes } from '@polkadot/types/types'
+import type { HexString } from '@polkadot/util/types'
+import { type PolkadotClient, createClient } from 'polkadot-api'
+import type { Observable } from 'rxjs'
+import { type Mock, beforeAll, beforeEach, expect, vi } from 'vitest'
 
 import { Api } from '@acala-network/chopsticks'
-import { Blockchain, BuildBlockMode, StorageValues } from '@acala-network/chopsticks-core'
+import { Blockchain, BuildBlockMode, type StorageValues } from '@acala-network/chopsticks-core'
 import { inherentProviders } from '@acala-network/chopsticks-core/blockchain/inherent/index.js'
 import { defer } from '@acala-network/chopsticks-core/utils/index.js'
 import { SqliteDatabase } from '@acala-network/chopsticks-db'
diff --git a/packages/e2e/src/hrmp.test.ts b/packages/e2e/src/hrmp.test.ts
index ce6d7755..41e119bb 100644
--- a/packages/e2e/src/hrmp.test.ts
+++ b/packages/e2e/src/hrmp.test.ts
@@ -1,6 +1,6 @@
 import { describe, it } from 'vitest'
 
-import { HorizontalMessage } from '@acala-network/chopsticks-core/blockchain/txpool.js'
+import type { HorizontalMessage } from '@acala-network/chopsticks-core/blockchain/txpool.js'
 
 import { checkSystemEvents, setupContext } from './helper.js'
 
diff --git a/packages/e2e/src/networks.ts b/packages/e2e/src/networks.ts
index ad5ed005..ce9d63a6 100644
--- a/packages/e2e/src/networks.ts
+++ b/packages/e2e/src/networks.ts
@@ -1,6 +1,6 @@
 import { config as dotenvConfig } from 'dotenv'
 
-import { SetupOption, setupContext } from '@acala-network/chopsticks-testing'
+import { type SetupOption, setupContext } from '@acala-network/chopsticks-testing'
 
 dotenvConfig()
 
diff --git a/packages/e2e/src/rpc-spec.test.ts b/packages/e2e/src/rpc-spec.test.ts
index 9f8f7680..c8af9cd4 100644
--- a/packages/e2e/src/rpc-spec.test.ts
+++ b/packages/e2e/src/rpc-spec.test.ts
@@ -1,4 +1,4 @@
-import { RuntimeContext } from '@polkadot-api/observable-client'
+import type { RuntimeContext } from '@polkadot-api/observable-client'
 import { ApiPromise } from '@polkadot/api'
 import { firstValueFrom } from 'rxjs'
 import { describe, expect, it } from 'vitest'
diff --git a/packages/e2e/src/state.test.ts b/packages/e2e/src/state.test.ts
index 1f132333..831350c1 100644
--- a/packages/e2e/src/state.test.ts
+++ b/packages/e2e/src/state.test.ts
@@ -1,7 +1,7 @@
 import { readFileSync } from 'node:fs'
 import path from 'node:path'
 import { runTask, taskHandler } from '@acala-network/chopsticks-core'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { describe, expect, it } from 'vitest'
 
 import { api, chain, check, checkHex, env, mockCallback, setupApi, testingPairs } from './helper.js'
diff --git a/packages/e2e/src/xcm.test.ts b/packages/e2e/src/xcm.test.ts
index 29bfe49e..62ed9474 100644
--- a/packages/e2e/src/xcm.test.ts
+++ b/packages/e2e/src/xcm.test.ts
@@ -1,12 +1,12 @@
 import { beforeEach, describe, it } from 'vitest'
 
 import { setStorage } from '@acala-network/chopsticks-core'
-import { DownwardMessage } from '@acala-network/chopsticks-core/blockchain/txpool.js'
+import type { DownwardMessage } from '@acala-network/chopsticks-core/blockchain/txpool.js'
 import { connectDownward } from '@acala-network/chopsticks-core/xcm/downward.js'
 import { connectUpward } from '@acala-network/chopsticks-core/xcm/upward.js'
 
 import { check, checkSystemEvents, testingPairs } from './helper.js'
-import networks, { Network } from './networks.js'
+import networks, { type Network } from './networks.js'
 
 const downwardMessages: DownwardMessage[] = [
   {
diff --git a/packages/testing/src/check.ts b/packages/testing/src/check.ts
index 577f5406..d000f65e 100644
--- a/packages/testing/src/check.ts
+++ b/packages/testing/src/check.ts
@@ -1,5 +1,5 @@
-import { ApiPromise } from '@polkadot/api'
-import { Codec } from '@polkadot/types/types'
+import type { ApiPromise } from '@polkadot/api'
+import type { Codec } from '@polkadot/types/types'
 
 type CodecOrArray = Codec | Codec[]
 
@@ -169,7 +169,7 @@ export class Checker {
 
     const processNumber = (value: number) => {
       if (precision > 0) {
-        const rounded = parseFloat(value.toPrecision(precision))
+        const rounded = Number.parseFloat(value.toPrecision(precision))
         if (rounded === value) {
           return rounded
         }
@@ -191,7 +191,7 @@ export class Checker {
       if (typeof obj === 'string') {
         if (redactNumber && obj.match(/0x000000[0-9a-f]{26}/)) {
           // this is very likely u128 encoded in hex
-          const num = parseInt(obj)
+          const num = Number.parseInt(obj)
           return processNumber(num)
         }
         if (redactHash && obj.match(/0x[0-9a-f]{64}/)) {
@@ -204,7 +204,7 @@ export class Checker {
           return '(address)'
         }
         if (redactNumber && obj.match(/^-?[\d,]+$/)) {
-          const num = parseInt(obj.replace(/,/g, ''))
+          const num = Number.parseInt(obj.replace(/,/g, ''))
           return processNumber(num)
         }
         return obj
diff --git a/packages/utils/src/index.ts b/packages/utils/src/index.ts
index 58b2cf45..67414104 100644
--- a/packages/utils/src/index.ts
+++ b/packages/utils/src/index.ts
@@ -1,6 +1,6 @@
 import {
   BuildBlockMode,
-  StorageValues,
+  type StorageValues,
   connectParachains,
   connectVertical,
   defaultLogger,
@@ -8,13 +8,13 @@ import {
   fetchConfig,
   setupWithServer,
 } from '@acala-network/chopsticks'
-import { NewBlockParams } from '@acala-network/chopsticks-core/rpc/dev/new-block.js'
-import { Config } from '@acala-network/chopsticks/schema/index.js'
+import type { NewBlockParams } from '@acala-network/chopsticks-core/rpc/dev/new-block.js'
+import type { Config } from '@acala-network/chopsticks/schema/index.js'
 import { ApiPromise, WsProvider } from '@polkadot/api'
-import { SubmittableExtrinsic } from '@polkadot/api-base/types'
+import type { SubmittableExtrinsic } from '@polkadot/api-base/types'
 import { Keyring, createTestKeyring } from '@polkadot/keyring'
-import { Codec } from '@polkadot/types/types'
-import { HexString } from '@polkadot/util/types'
+import type { Codec } from '@polkadot/types/types'
+import type { HexString } from '@polkadot/util/types'
 
 const logger = defaultLogger.child({ name: 'utils' })
 
diff --git a/packages/utils/src/signFake.ts b/packages/utils/src/signFake.ts
index 3c6b5f61..de799998 100644
--- a/packages/utils/src/signFake.ts
+++ b/packages/utils/src/signFake.ts
@@ -1,6 +1,6 @@
-import { ApiPromise } from '@polkadot/api'
-import { GenericExtrinsic } from '@polkadot/types'
-import { SignatureOptions } from '@polkadot/types/types'
+import type { ApiPromise } from '@polkadot/api'
+import type { GenericExtrinsic } from '@polkadot/types'
+import type { SignatureOptions } from '@polkadot/types/types'
 
 export type SignFakeOptions = Partial<SignatureOptions>
 
diff --git a/packages/web-test/src/App.tsx b/packages/web-test/src/App.tsx
index 23e75540..c2542ee2 100644
--- a/packages/web-test/src/App.tsx
+++ b/packages/web-test/src/App.tsx
@@ -17,7 +17,7 @@ import {
 import { styled } from '@mui/system'
 import { ApiPromise } from '@polkadot/api'
 import { createTestPairs } from '@polkadot/keyring'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 import { useEffect, useState } from 'react'
 
 const { alice, bob } = createTestPairs()
diff --git a/packages/web-test/src/vite-env.d.ts b/packages/web-test/src/vite-env.d.ts
index 0bd28fbf..60a8fae0 100644
--- a/packages/web-test/src/vite-env.d.ts
+++ b/packages/web-test/src/vite-env.d.ts
@@ -1,7 +1,7 @@
 /// <reference types="vite/client" />
 
-import { Blockchain } from '@acala-network/chopsticks-core'
-import { ApiPromise } from '@polkadot/api'
+import type { Blockchain } from '@acala-network/chopsticks-core'
+import type { ApiPromise } from '@polkadot/api'
 
 declare global {
   // eslint-disable-next-line no-var
diff --git a/packages/web-test/tests/index.spec.ts b/packages/web-test/tests/index.spec.ts
index 03c48fba..a5a0fde4 100644
--- a/packages/web-test/tests/index.spec.ts
+++ b/packages/web-test/tests/index.spec.ts
@@ -1,5 +1,5 @@
 import { expect, test } from '@playwright/test'
-import { HexString } from '@polkadot/util/types'
+import type { HexString } from '@polkadot/util/types'
 
 test.describe('index', () => {
   test.beforeEach(async ({ page }) => {