source: frontend/node_modules/npm-run-path/index.js

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

const npmRunPath = options => {
        options = {
                cwd: process.cwd(),
                path: process.env[pathKey()],
                execPath: process.execPath,
                ...options
        };

        let previous;
        let cwdPath = path.resolve(options.cwd);
        const result = [];

        while (previous !== cwdPath) {
                result.push(path.join(cwdPath, 'node_modules/.bin'));
                previous = cwdPath;
                cwdPath = path.resolve(cwdPath, '..');
        }

        // Ensure the running `node` binary is used
        const execPathDir = path.resolve(options.cwd, options.execPath, '..');
        result.push(execPathDir);

        return result.concat(options.path).join(path.delimiter);
};

module.exports = npmRunPath;
// TODO: Remove this for the next major release
module.exports.default = npmRunPath;

module.exports.env = options => {
        options = {
                env: process.env,
                ...options
        };

        const env = {...options.env};
        const path = pathKey({env});

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

        return env;
};