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105 lines
4.6 KiB
105 lines
4.6 KiB
'use strict'
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const { extname, isAbsolute, dirname } = require('path')
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const { access, accessSync, constants: { F_OK } } = require('fs')
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const { promisify, callbackify } = require('util')
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const readPkgUp = callbackify(require('read-pkg-up'))
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const isFileEsmPromise = promisify(isFileEsm)
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const tick = queueMicrotask
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const ERR_PATH_MUST_BE_STRING = 'is-esm: path must be a string'
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const ERR_PATH_MUST_BE_ABSOLUTE = 'is-esm: absolute paths only'
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const ERR_PATH_MUST_EXIST = 'is-esm: path does not exist'
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const ERR_PATH_MUST_HAVE_VALID_EXT = 'is-esm: path must be to a file with an extension of .js, .mjs or .cjs'
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function isFileEsm (path, cb) {
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if (arguments.length <= 1) return isFileEsmPromise(path)
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if (typeof path !== 'string') return void tick(() => cb(Error(ERR_PATH_MUST_BE_STRING)))
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if (isAbsolute(path) === false) return void tick(() => cb(Error(ERR_PATH_MUST_BE_ABSOLUTE)))
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const extMatch = /\.(c|m)?js/.exec(extname(path))
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if (extMatch === null) return void tick(() => cb(Error(ERR_PATH_MUST_HAVE_VALID_EXT)))
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access(path, F_OK, (err) => {
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if (err) return void cb(Error(ERR_PATH_MUST_EXIST))
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const [, extType = 'j'] = extMatch
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const cwd = dirname(path)
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readPkgUp({ cwd }, (err, pkg) => {
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if (err) return void cb(err)
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const { type } = pkg.packageJson
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switch (type) {
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case undefined: {
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if (extType === 'j') return void cb(null, { esm: false, type, extType, path, pkgPath: pkg.path })
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if (extType === 'm') return void cb(null, { esm: true, type, extType, path, pkgPath: pkg.path })
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/* istanbul ignore else */
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if (extType === 'c') return void cb(null, { esm: false, type, extType, path, pkgPath: pkg.path })
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// unreachable
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}
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case 'commonjs': {
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if (extType === 'j') return void cb(null, { esm: false, type, extType, path, pkgPath: pkg.path })
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if (extType === 'm') return void cb(null, { esm: true, type, extType, path, pkgPath: pkg.path })
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/* istanbul ignore else */
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if (extType === 'c') return void cb(null, { esm: false, type, extType, path, pkgPath: pkg.path })
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// unreachable
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}
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case 'module': {
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if (extType === 'j') return void cb(null, { esm: true, type, extType, path, pkgPath: pkg.path })
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if (extType === 'm') return void cb(null, { esm: true, type, extType, path, pkgPath: pkg.path })
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/* istanbul ignore else */
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if (extType === 'c') return void cb(null, { esm: false, type, extType, path, pkgPath: pkg.path })
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// unreachable
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}
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default: return void cb(Object.assign(Error(`package.json type "${type}" not recognized`), { meta: { type, extType, path, pkgPath: pkg.path } }))
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}
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})
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})
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}
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isFileEsm.sync = function isFileEsmSync (path) {
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if (typeof path !== 'string') throw Error(ERR_PATH_MUST_BE_STRING)
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if (isAbsolute(path) === false) throw Error(ERR_PATH_MUST_BE_ABSOLUTE)
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const extMatch = /\.(c|m)?js/.exec(extname(path))
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if (extMatch === null) throw Error(ERR_PATH_MUST_HAVE_VALID_EXT)
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try {
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accessSync(path, F_OK)
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} catch (err) {
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throw Error(ERR_PATH_MUST_EXIST)
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}
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const [, extType = 'j'] = extMatch
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const cwd = dirname(path)
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const pkg = readPkgUp.sync({ cwd })
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const { type } = pkg.packageJson
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switch (type) {
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case undefined: {
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if (extType === 'j') return { esm: false, type, extType, path, pkgPath: pkg.path }
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if (extType === 'm') return { esm: true, type, extType, path, pkgPath: pkg.path }
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/* istanbul ignore else */
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if (extType === 'c') return { esm: false, type, extType, path, pkgPath: pkg.path }
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// unreachable
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}
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case 'commonjs': {
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if (extType === 'j') return { esm: false, type, extType, path, pkgPath: pkg.path }
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if (extType === 'm') return { esm: true, type, extType, path, pkgPath: pkg.path }
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/* istanbul ignore else */
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if (extType === 'c') return { esm: false, type, extType, path, pkgPath: pkg.path }
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// unreachable
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}
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case 'module': {
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if (extType === 'j') return { esm: true, type, extType, path, pkgPath: pkg.path }
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if (extType === 'm') return { esm: true, type, extType, path, pkgPath: pkg.path }
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/* istanbul ignore else */
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if (extType === 'c') return { esm: false, type, extType, path, pkgPath: pkg.path }
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// unreachable
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}
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default: throw Object.assign(Error(`package.json type "${type}" not recognized`), { meta: { type, extType, path, pkgPath: pkg.path } })
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}
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}
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isFileEsm.constants = {
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ERR_PATH_MUST_BE_STRING,
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ERR_PATH_MUST_BE_ABSOLUTE,
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ERR_PATH_MUST_EXIST,
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ERR_PATH_MUST_HAVE_VALID_EXT
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}
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module.exports = isFileEsm
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