25 lines
1.4 KiB
JavaScript
25 lines
1.4 KiB
JavaScript
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'use strict';
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const path = require('path');
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const {fileURLToPath} = require('url');
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const resolveCwd = require('resolve-cwd');
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const pkgDir = require('pkg-dir');
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module.exports = filename => {
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const normalizedFilename = filename.startsWith('file://') ? fileURLToPath(filename) : filename;
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const globalDir = pkgDir.sync(path.dirname(normalizedFilename));
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const relativePath = path.relative(globalDir, normalizedFilename);
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const pkg = require(path.join(globalDir, 'package.json'));
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const localFile = resolveCwd.silent(path.join(pkg.name, relativePath));
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const localNodeModules = path.join(process.cwd(), 'node_modules');
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const filenameInLocalNodeModules = !path.relative(localNodeModules, normalizedFilename).startsWith('..') &&
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// On Windows, if `localNodeModules` and `normalizedFilename` are on different partitions, `path.relative()` returns the value of `normalizedFilename`, resulting in `filenameInLocalNodeModules` incorrectly becoming `true`.
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path.parse(localNodeModules).root === path.parse(normalizedFilename).root;
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// Use `path.relative()` to detect local package installation,
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// because __filename's case is inconsistent on Windows
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// Can use `===` when targeting Node.js 8
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// See https://github.com/nodejs/node/issues/6624
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return !filenameInLocalNodeModules && localFile && path.relative(localFile, normalizedFilename) !== '' && require(localFile);
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};
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