react-router-ga/example/node_modules/npm-run-path/index.js

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'use strict';
const path = require('path');
const pathKey = require('path-key');

module.exports = opts => {
	opts = Object.assign({
		cwd: process.cwd(),
		path: process.env[pathKey()]
	}, opts);

	let prev;
	let pth = path.resolve(opts.cwd);
	const ret = [];

	while (prev !== pth) {
		ret.push(path.join(pth, 'node_modules/.bin'));
		prev = pth;
		pth = path.resolve(pth, '..');
	}

	// ensure the running `node` binary is used
	ret.push(path.dirname(process.execPath));

	return ret.concat(opts.path).join(path.delimiter);
};

module.exports.env = opts => {
	opts = Object.assign({
		env: process.env
	}, opts);

	const env = Object.assign({}, opts.env);
	const path = pathKey({env});

	opts.path = env[path];
	env[path] = module.exports(opts);

	return env;
};