| 'use strict'; |
| const path = require('path'); |
| const resolveCwd = require('resolve-cwd'); |
| const pkgDir = require('pkg-dir'); |
| |
| module.exports = filename => { |
| const globalDir = pkgDir.sync(path.dirname(filename)); |
| const relativePath = path.relative(globalDir, filename); |
| const pkg = require(path.join(globalDir, 'package.json')); |
| const localFile = resolveCwd.silent(path.join(pkg.name, relativePath)); |
| |
| // Use `path.relative()` to detect local package installation, |
| // because __filename's case is inconsistent on Windows |
| // Can use `===` when targeting Node.js 8 |
| // See https://github.com/nodejs/node/issues/6624 |
| return localFile && path.relative(localFile, filename) !== '' ? require(localFile) : null; |
| }; |