Use ESM

.gitignore

@@ -1,6 +1,5 @@
 .DS_Store
 *.log
-.nyc_output/
 coverage/
 node_modules/
 yarn.lock

.prettierignore

@@ -1,3 +1,2 @@
 coverage/
-*.json
 *.md

index.js

@@ -1,25 +1,21 @@
-'use strict'
+import fs from 'fs'
+import path from 'path'
+import {toVFile} from 'to-vfile'
 
-var fs = require('fs')
-var path = require('path')
-var vfile = require('to-vfile')
+export const INCLUDE = 1
+export const SKIP = 4
+export const BREAK = 8
 
-exports.INCLUDE = 1
-exports.SKIP = 4
-exports.BREAK = 8
-exports.all = all
-exports.one = one
+// Find files or directories downwards.
+export function findDown(test, paths, callback) {
+  return find(test, paths, callback)
+}
 
 // Find a file or a directory downwards.
-function one(test, paths, callback) {
+export function findDownOne(test, paths, callback) {
   return find(test, paths, callback, true)
 }
 
-// Find files or directories downwards.
-function all(test, paths, callback) {
-  return find(test, paths, callback)
-}
-
 // Find applicable files.
 function find(test, paths, callback, one) {
   var state = {checked: [], test: augment(test)}
@@ -41,7 +37,7 @@ function find(test, paths, callback, one) {
 // Find files in `filePath`.
 function visit(state, filePath, one, done) {
   // Don’t walk into places multiple times.
-  if (state.checked.indexOf(filePath) > -1) {
+  if (state.checked.includes(filePath)) {
     done([])
     return
   }
@@ -58,7 +54,7 @@ function visit(state, filePath, one, done) {
     if (state.broken || !real) {
       done([])
     } else {
-      file = vfile(filePath)
+      file = toVFile(filePath)
       result = state.test(file, stats)
 
       if ((result & 1) === 1 /* Include. */) {
@@ -103,7 +99,7 @@ function visitAll(state, paths, cwd, one, done) {
   var index = -1
 
   while (++index < paths.length) {
-    each(path[index])
+    each(paths[index])
   }
 
   next()

package.json

@@ -25,32 +25,29 @@
   "contributors": [
     "Titus Wormer <[email protected]> (https://wooorm.com)"
   ],
+  "sideEffects": false,
+  "type": "module",
+  "main": "index.js",
   "files": [
     "index.js"
   ],
   "dependencies": {
-    "to-vfile": "^6.0.0"
+    "to-vfile": "^7.0.0"
   },
   "devDependencies": {
-    "nyc": "^15.0.0",
+    "c8": "^7.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^9.0.0",
     "remark-preset-wooorm": "^8.0.0",
     "tape": "^5.0.0",
-    "xo": "^0.38.0"
+    "xo": "^0.39.0"
   },
   "scripts": {
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "test-api": "node test",
-    "test-coverage": "nyc --reporter lcov tape test/index.js",
+    "test-api": "node test/index.js",
+    "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov node test/index.js",
     "test": "npm run format && npm run test-coverage"
   },
-  "nyc": {
-    "check-coverage": true,
-    "lines": 100,
-    "functions": 100,
-    "branches": 100
-  },
   "prettier": {
     "tabWidth": 2,
     "useTabs": false,
@@ -61,10 +58,9 @@
   },
   "xo": {
     "prettier": true,
-    "esnext": false,
     "rules": {
-      "unicorn/no-fn-reference-in-iterator": "off",
-      "unicorn/prefer-includes": "off"
+      "no-var": "off",
+      "prefer-arrow-callback": "off"
     }
   },
   "remarkConfig": {

readme.md

@@ -11,6 +11,9 @@ Find [vfile][]s by searching the file system downwards.
 
 ## Install
 
+This package is [ESM only](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c):
+Node 12+ is needed to use it and it must be `import`ed instead of `require`d.
+
 [npm][]:
 
 ```sh
@@ -22,7 +25,7 @@ npm install vfile-find-down
 ```js
 var findDown = require('vfile-find-down')
 
-findDown.all('.md', console.log)
+findDown('.md', console.log)
 ```
 
 Yields:
@@ -37,7 +40,11 @@ null [ VFile {
 
 ## API
 
-### `findDown.all(tests[, paths], callback)`
+This package exports the following identifiers: `findDown`, `findDownOne`,
+`INCLUDE`, `SKIP`, `BREAK`.
+There is no default export.
+
+### `findDown(tests[, paths], callback)`
 
 Search for `tests` downwards.
 Invokes callback with either an error or an array of files passing `tests`.
@@ -67,9 +74,9 @@ Place(s) to searching from (`Array.<string>` or `string`, default:
 
 Function invoked with all matching files (`function cb(err[, files])`).
 
-### `findDown.one(tests[, paths], callback)`
+### `findDownOne(tests[, paths], callback)`
 
-Like `findDown.all`, but invokes `callback` with the first found file, or
+Like `findDown`, but invokes `callback` with the first found file, or
 `null`.
 
 ### `function test(file, stats)`
@@ -79,13 +86,13 @@ Invoked with a [vfile][] and a [stats][] object.
 
 ###### Returns
 
-*   `true` or `findDown.INCLUDE` — Include the file in the results
-*   `findDown.SKIP` — Do not search inside this directory
-*   `findDown.BREAK` — Stop searching for files
+*   `true` or `INCLUDE` — Include the file in the results
+*   `SKIP` — Do not search inside this directory
+*   `BREAK` — Stop searching for files
 *   anything else is ignored: files are neither included nor skipped
 
 The different flags can be combined by using the pipe operator:
-`findDown.INCLUDE | findDown.SKIP`.
+`INCLUDE | SKIP`.
 
 ## Contribute