93 lines
2.6 KiB
JavaScript
93 lines
2.6 KiB
JavaScript
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/*!
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* resolve-package <https://github.com/tunnckoCore/resolve-package>
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*
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* Copyright (c) Charlike Mike Reagent <@tunnckoCore> (http://i.am.charlike.online)
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* Released under the MIT license.
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*/
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'use strict'
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const fs = require('fs')
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const path = require('path')
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const get = require('get-installed-path')
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/**
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* > Get full absolute path of package with `name` from
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* local node_modules or from globally installed.
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*
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* **Example**
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*
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* ```js
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* const resolvePackage = require('resolve-package')
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*
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* resolvePackage('npm').then((fp) => {
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* console.log(fp)
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* // => '~/.nvm/versions/node/v7.0.0/lib/node_modules/npm/lib/npm.js'
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* })
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*
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* resolvePackage('standard').then((fp) => {
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* console.log(fp)
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* // => '~/.nvm/versions/node/v7.0.0/lib/node_modules/standard/index.js'
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* })
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*
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* resolvePackage('get-installed-path').then((fp) => {
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* console.log(fp)
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* // => '~/code/resolve-package/node_modules/get-installed-path/index.js'
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* })
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*
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* resolvePackage('foo-quqixs-dasdasdh').catch((err) => {
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* console.error(err) // => Error module not found
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* })
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* ```
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*
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* @name resolvePackage
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* @param {String} `name` package name
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* @param {Function} `opts` optional options such as below
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* @param {String} `opts.cwd` directory where is the `node_modules` folder
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* @param {String} `opts.mainFile` main file for directories, default `index.js`
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* @param {String} `opts.mainField` name of the package.json's "main" field, default `main`
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* @return {Promise}
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* @api public
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*/
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const resolvePackage = (name, opts) => new Promise((resolve, reject) => {
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opts = opts && typeof opts === 'object' ? opts : {}
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opts.local = true
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get(name, opts).then(tryLoad(opts, resolve), (e) => {
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opts.local = false
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get(name, opts).then(tryLoad(opts, resolve), reject)
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})
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})
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const tryLoad = (opts, resolve) => (fp) => {
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readPackage(fp).then(
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(pkg) => {
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if (typeof opts.mainFile === 'string') {
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return resolve(path.resolve(fp, opts.mainFile))
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}
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if (typeof opts.mainField === 'string') {
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fp = path.resolve(fp, pkg[opts.mainField])
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return resolve(fp)
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}
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resolve(path.resolve(fp, pkg.main || ''))
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},
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(e) => {
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const index = typeof opts.mainFile === 'string'
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? opts.mainFile
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: 'index.js'
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resolve(path.resolve(fp, index))
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}
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)
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}
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const readPackage = (fp) => new Promise((resolve, reject) => {
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fs.readFile(path.resolve(fp, 'package.json'), 'utf8', (err, str) => {
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if (err) return reject(err)
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const json = JSON.parse(str)
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resolve(json)
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})
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})
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module.exports = resolvePackage
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