Function hashLength

lib/TemplatedPathPlugin.js:206–258

(
	replacer,
	handler,
	assetInfo,
	hashName,
	sourceDigest,
	fullValue,
	recordDigest,
	digestHandler
)

 * @returns {Replacer} hash replacer function
 */
const hashLength = (
	replacer,
	handler,
	assetInfo,
	hashName,
	sourceDigest,
	fullValue,
	recordDigest,
	digestHandler
) => {
	/** @type {Replacer} */
	const fn = (match, arg, input, digest) => {
		/** @type {string} */
		let result;
		const length = arg && Number.parseInt(arg, 10);

		if (digest && digestHandler) {
			result = digestHandler(digest, length || undefined);
		} else if (digest) {
			const hash = reEncodeDigest(
				fullValue !== undefined ? fullValue : replacer(match, arg, input),
				sourceDigest,
				digest
			);
			result = length ? hash.slice(0, length) : hash;
		} else if (length && handler) {
			result = handler(length);
		} else {
			const hash = replacer(match, arg, input);

			result = length ? hash.slice(0, length) : hash;
		}
		if (assetInfo) {
			assetInfo.immutable = true;
			if (digest && recordDigest) {
				// `base64safe` is encoded as `base64url`; record what the value is in.
				(assetInfo.contenthashDigest || (assetInfo.contenthashDigest = {}))[
					result
				] = digest === "base64safe" ? "base64url" : digest;
			}
			if (Array.isArray(assetInfo[hashName])) {
				assetInfo[hashName] = [...assetInfo[hashName], result];
			} else if (assetInfo[hashName]) {
				assetInfo[hashName] = [assetInfo[hashName], result];
			} else {
				assetInfo[hashName] = result;
			}
		}
		return result;
	};

	return fn;
};

/** @typedef {(match: string, arg: string | undefined, input: string, digest?: string) => string} Replacer */