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- '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));
- const localNodeModules = path.join(process.cwd(), 'node_modules');
- const filenameInLocalNodeModules = !path.relative(localNodeModules, filename).startsWith('..');
-
- // 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 !filenameInLocalNodeModules && localFile && path.relative(localFile, filename) !== '' && require(localFile);
- };
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