[#94] Backend

https://project.mdnd-it.cc/work_packages/94

SerpentRace_Backend/node_modules/import-local/index.js

@@ -0,0 +1,24 @@
+'use strict';
+const path = require('path');
+const {fileURLToPath} = require('url');
+const resolveCwd = require('resolve-cwd');
+const pkgDir = require('pkg-dir');
+
+module.exports = filename => {
+	const normalizedFilename = filename.startsWith('file://') ? fileURLToPath(filename) : filename;
+	const globalDir = pkgDir.sync(path.dirname(normalizedFilename));
+	const relativePath = path.relative(globalDir, normalizedFilename);
+	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, normalizedFilename).startsWith('..') &&
+		// On Windows, if `localNodeModules` and `normalizedFilename` are on different partitions, `path.relative()` returns the value of `normalizedFilename`, resulting in `filenameInLocalNodeModules` incorrectly becoming `true`.
+		path.parse(localNodeModules).root === path.parse(normalizedFilename).root;
+
+	// 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, normalizedFilename) !== '' && require(localFile);
+};