Method parseCommentOptions

lib/css/CssParser.js:1303–1357

(range)

		 * @returns {{ options: Record<string, EXPECTED_ANY> | null, errors: (Error & { comment: Comment })[] | null }} result
		 */
		const parseCommentOptions = (range) => {
			const found = getComments(range);
			if (found.length === 0) {
				return EMPTY_COMMENT_OPTIONS;
			}
			/** @type {Record<string, EXPECTED_ANY>} */
			const options = {};
			/** @type {(Error & { comment: Comment })[]} */
			const errors = [];
			for (const c of found) {
				const { value } = c;
				if (value && webpackCommentRegExp.test(value)) {
					// Fast path for the common `webpackXxx: <bool|number|null>` pair, keeping it out of `vm.runInContext`.
					const fast = MAGIC_COMMENT_FAST_PATH.exec(value);
					if (fast !== null) {
						const key = fast[1];
						const raw = fast[2];
						options[key] =
							raw === "true"
								? true
								: raw === "false"
									? false
									: raw === "null"
										? null
										: Number(raw);
						continue;
					}
					// try compile only if webpack options comment is present
					try {
						for (let [key, val] of Object.entries(
							vm.runInContext(
								`(function(){return {${value}};})()`,
								magicCommentContext
							)
						)) {
							if (typeof val === "object" && val !== null) {
								val =
									val.constructor.name === "RegExp"
										? new RegExp(val)
										: JSON.parse(JSON.stringify(val));
							}
							options[key] = val;
						}
					} catch (err) {
						const newErr = new Error(
							String(/** @type {Error} */ (err).message)
						);
						newErr.stack = String(/** @type {Error} */ (err).stack);
						Object.assign(newErr, { comment: c });
						errors.push(/** @type {(Error & { comment: Comment })} */ (newErr));
					}
				}
			}
			return { options, errors };
		};

		// CSS modules stuff