Add basic ESM support

Fixes jprichardson#746

lib/index.mjs

@@ -0,0 +1,295 @@
+import fs from './index.js'
+
+const {
+  Dir,
+  Dirent,
+  F_OK,
+  FileReadStream,
+  FileWriteStream,
+  R_OK,
+  ReadStream,
+  Stats,
+  W_OK,
+  WriteStream,
+  X_OK,
+  _toUnixTimestamp,
+  access,
+  accessSync,
+  appendFile,
+  appendFileSync,
+  chmod,
+  chmodSync,
+  chown,
+  chownSync,
+  close,
+  closeSync,
+  constants,
+  copy,
+  copyFile,
+  copyFileSync,
+  copySync,
+  createFile,
+  createFileSync,
+  createLink,
+  createLinkSync,
+  createReadStream,
+  createSymlink,
+  createSymlinkSync,
+  createWriteStream,
+  emptyDir,
+  emptyDirSync,
+  emptydir,
+  emptydirSync,
+  ensureDir,
+  ensureDirSync,
+  ensureFile,
+  ensureFileSync,
+  ensureLink,
+  ensureLinkSync,
+  ensureSymlink,
+  ensureSymlinkSync,
+  exists,
+  existsSync,
+  fchmod,
+  fchmodSync,
+  fchown,
+  fchownSync,
+  fdatasync,
+  fdatasyncSync,
+  fstat,
+  fstatSync,
+  fsync,
+  fsyncSync,
+  ftruncate,
+  ftruncateSync,
+  futimes,
+  futimesSync,
+  gracefulify,
+  lchmod,
+  lchmodSync,
+  lchown,
+  lchownSync,
+  link,
+  linkSync,
+  lstat,
+  lstatSync,
+  lutimes,
+  lutimesSync,
+  mkdir,
+  mkdirSync,
+  mkdirp,
+  mkdirpSync,
+  mkdirs,
+  mkdirsSync,
+  mkdtemp,
+  mkdtempSync,
+  move,
+  moveSync,
+  open,
+  openSync,
+  opendir,
+  opendirSync,
+  outputFile,
+  outputFileSync,
+  outputJSON,
+  outputJSONSync,
+  outputJson,
+  outputJsonSync,
+  pathExists,
+  pathExistsSync,
+  read,
+  readFile,
+  readFileSync,
+  readJSON,
+  readJSONSync,
+  readJson,
+  readJsonSync,
+  readSync,
+  readdir,
+  readdirSync,
+  readlink,
+  readlinkSync,
+  readv,
+  readvSync,
+  realpath,
+  realpathSync,
+  remove,
+  removeSync,
+  rename,
+  renameSync,
+  rm,
+  rmSync,
+  rmdir,
+  rmdirSync,
+  stat,
+  statSync,
+  symlink,
+  symlinkSync,
+  truncate,
+  truncateSync,
+  unlink,
+  unlinkSync,
+  unwatchFile,
+  utimes,
+  utimesSync,
+  watch,
+  watchFile,
+  write,
+  writeFile,
+  writeFileSync,
+  writeJSON,
+  writeJSONSync,
+  writeJson,
+  writeJsonSync,
+  writeSync,
+  writev,
+  writevSync,
+  promises
+} = fs
+
+export {
+  Dir,
+  Dirent,
+  F_OK,
+  FileReadStream,
+  FileWriteStream,
+  R_OK,
+  ReadStream,
+  Stats,
+  W_OK,
+  WriteStream,
+  X_OK,
+  _toUnixTimestamp,
+  access,
+  accessSync,
+  appendFile,
+  appendFileSync,
+  chmod,
+  chmodSync,
+  chown,
+  chownSync,
+  close,
+  closeSync,
+  constants,
+  copy,
+  copyFile,
+  copyFileSync,
+  copySync,
+  createFile,
+  createFileSync,
+  createLink,
+  createLinkSync,
+  createReadStream,
+  createSymlink,
+  createSymlinkSync,
+  createWriteStream,
+  emptyDir,
+  emptyDirSync,
+  emptydir,
+  emptydirSync,
+  ensureDir,
+  ensureDirSync,
+  ensureFile,
+  ensureFileSync,
+  ensureLink,
+  ensureLinkSync,
+  ensureSymlink,
+  ensureSymlinkSync,
+  exists,
+  existsSync,
+  fchmod,
+  fchmodSync,
+  fchown,
+  fchownSync,
+  fdatasync,
+  fdatasyncSync,
+  fstat,
+  fstatSync,
+  fsync,
+  fsyncSync,
+  ftruncate,
+  ftruncateSync,
+  futimes,
+  futimesSync,
+  gracefulify,
+  lchmod,
+  lchmodSync,
+  lchown,
+  lchownSync,
+  link,
+  linkSync,
+  lstat,
+  lstatSync,
+  lutimes,
+  lutimesSync,
+  mkdir,
+  mkdirSync,
+  mkdirp,
+  mkdirpSync,
+  mkdirs,
+  mkdirsSync,
+  mkdtemp,
+  mkdtempSync,
+  move,
+  moveSync,
+  open,
+  openSync,
+  opendir,
+  opendirSync,
+  outputFile,
+  outputFileSync,
+  outputJSON,
+  outputJSONSync,
+  outputJson,
+  outputJsonSync,
+  pathExists,
+  pathExistsSync,
+  read,
+  readFile,
+  readFileSync,
+  readJSON,
+  readJSONSync,
+  readJson,
+  readJsonSync,
+  readSync,
+  readdir,
+  readdirSync,
+  readlink,
+  readlinkSync,
+  readv,
+  readvSync,
+  realpath,
+  realpathSync,
+  remove,
+  removeSync,
+  rename,
+  renameSync,
+  rm,
+  rmSync,
+  rmdir,
+  rmdirSync,
+  stat,
+  statSync,
+  symlink,
+  symlinkSync,
+  truncate,
+  truncateSync,
+  unlink,
+  unlinkSync,
+  unwatchFile,
+  utimes,
+  utimesSync,
+  watch,
+  watchFile,
+  write,
+  writeFile,
+  writeFileSync,
+  writeJSON,
+  writeJSONSync,
+  writeJson,
+  writeJsonSync,
+  writeSync,
+  writev,
+  writevSync,
+  promises
+}

make-esm.js

@@ -0,0 +1,16 @@
+const fs = require('./lib')
+
+const list = [
+  '{',
+  ...Object.keys(fs).sort().map(key => `  ${key},`),
+  '  promises',
+  '}'
+].join('\n')
+
+fs.outputFile('./lib/index.mjs', `
+import fs from './index.js'
+
+const ${list} = fs
+
+export ${list}
+`.trimStart())

package.json

@@ -54,6 +54,10 @@
     "standard": "^14.1.0"
   },
   "main": "./lib/index.js",
+  "exports": {
+    "import": "./lib/index.mjs",
+    "require": "./lib/index.js"
+  },
   "files": [
     "lib/",
     "!lib/**/__tests__/"
@@ -63,6 +67,7 @@
     "coverage": "nyc -r lcovonly npm run unit",
     "coveralls": "coveralls < coverage/lcov.info",
     "lint": "standard",
+    "make-esm": "node make-esm.js",
     "test-find": "find ./lib/**/__tests__ -name *.test.js | xargs mocha",
     "test": "npm run lint && npm run unit",
     "unit": "node test.js"