diff --git a/src/main/ts/replacer.ts b/src/main/ts/replacer.ts
new file mode 100644
index 0000000..1169ce1
--- /dev/null
+++ b/src/main/ts/replacer.ts
@@ -0,0 +1,22 @@
+import {IReplacer} from './interface'
+
+export const replaceExportMain: IReplacer = {
+  from: '\texport = main;',
+  to: ''
+}
+
+export const replaceImportMain: IReplacer = {
+  from: /\timport main = require\('(.+)'\);/g,
+  to: (line: string) => {
+    const [, name] = /^\timport main = require\('(.+)'\);$/.exec(line) || []
+    return `	export * from '${name}';`
+  }
+}
+
+export const replaceBrokenModulePrefix: IReplacer = (pattern => ({
+  from: pattern,
+  to: (line: string) => {
+    const [, module] = pattern.exec(line) || []
+    return `${module}index' {`
+  }
+}))(/(declare module '.+\/target\/es5\/)[^/]*\/src\/main\/index'.+/)
diff --git a/src/test/ts/replacer.ts b/src/test/ts/replacer.ts
new file mode 100644
index 0000000..0f14e6e
--- /dev/null
+++ b/src/test/ts/replacer.ts
@@ -0,0 +1,40 @@
+import {IReplacer} from '../../main/ts/interface'
+import {
+  replaceExportMain,
+  replaceImportMain,
+  replaceBrokenModulePrefix,
+} from '../../main/ts/replacer'
+
+describe('replacer', () => {
+  const assertReplacement = ({from, to}: IReplacer, input: string, output: string) => {
+    if (from instanceof RegExp) {
+      expect(from.test(input)).toBeTruthy()
+    }
+
+    if (typeof from === 'string') {
+      expect(input.includes(from)).toBeTruthy()
+    }
+
+    if (typeof to === 'function') {
+      expect(to(input, '')).toBe(output)
+    }
+  }
+
+  it('#replaceExportMain', () => {
+    assertReplacement(replaceExportMain, '\texport = main;', 'bar')
+  })
+
+  it('#replaceImportMain', () => {
+    assertReplacement(
+      replaceImportMain,
+      '	import main = require(\'foo\');',
+      '	export * from \'foo\';')
+  })
+
+  it('#replaceBrokenModulePrefix', () => {
+    assertReplacement(
+      replaceBrokenModulePrefix,
+      'declare module \'@qiwi/foo/target/es5//src/main/index\' {',
+      'declare module \'@qiwi/foo/target/es5/index\' {')
+  })
+})