Function expand

lib/DotenvPlugin.js:165–196

* Expand environment variables in parsed object * ported from https://github.com/motdotla/dotenv-expand * @param {{ parsed: Env, processEnv: Record<string, string | undefined> }} options expand options * @returns {{ parsed: Env }} expanded options

(options)

 * @returns {{ parsed: Env }} expanded options
 */
function expand(options) {
	// for use with progressive expansion
	const runningParsed = /** @type {Env} */ (Object.create(null));
	const processEnv = options.processEnv;

	// dotenv.config() ran before this so the assumption is process.env has already been set
	for (const key in options.parsed) {
		let value = options.parsed[key];

		// short-circuit scenario: process.env was already set prior to the file value
		value =
			Object.prototype.hasOwnProperty.call(processEnv, key) &&
			processEnv[key] !== value
				? /** @type {string} */ (processEnv[key])
				: expandValue(value, processEnv, runningParsed);

		const resolvedValue = _resolveEscapeSequences(value);

		options.parsed[key] = resolvedValue;
		// for use with progressive expansion
		runningParsed[key] = resolvedValue;
	}

	// Part of `dotenv-expand` code, but we don't need it because of we don't modify `process.env`
	// for (const processKey in options.parsed) {
	// 	if (processEnv) {
	// 		processEnv[processKey] = options.parsed[processKey];
	// 	}
	// }

	return options;
}

/**
 * Format environment variables as DefinePlugin definitions