Method _readContextTimestamp

lib/FileSystemInfo.js:3878–3994

* @private * @type {Processor<string, ContextFileSystemInfoEntry>}

(path, callback)

	 * @type {Processor<string, ContextFileSystemInfoEntry>}
	 */
	_readContextTimestamp(path, callback) {
		this._readContext(
			{
				path,
				fromImmutablePath: () =>
					/** @type {ContextFileSystemInfoEntry | FileSystemInfoEntry | class="st">"ignore" | null} */
					(null),
				fromManagedItem: (info) => ({
					safeTime: 0,
					timestampHash: info
				}),
				fromSymlink: (file, target, callback) => {
					callback(
						null,
						/** @type {ContextFileSystemInfoEntry} */
						({
							timestampHash: target,
							symlinks: new Set([target])
						})
					);
				},
				fromFile: (file, stat, callback) => {
					class="cm">// Prefer the cached value over our new stat to report consistent results
					const cache = this._fileTimestamps.get(file);
					if (cache !== undefined && !isExistenceOnly(cache)) {
						return callback(
							null,
							cache === class="st">"ignore"
								? null
								: /** @type {FileSystemInfoEntry | null} */ (cache)
						);
					}

					const mtime = Number(stat.mtime);

					if (mtime) applyMtime(mtime);

					/** @type {FileSystemInfoEntry} */
					const ts = {
						safeTime: mtime ? mtime + FS_ACCURACY : Infinity,
						timestamp: mtime
					};

					this._fileTimestamps.set(file, ts);
					this._cachedDeprecatedFileTimestamps = undefined;
					callback(null, ts);
				},
				fromDirectory: (directory, stat, callback) => {
					this.contextTimestampQueue.increaseParallelism();
					this._getUnresolvedContextTimestamp(directory, (err, tsEntry) => {
						this.contextTimestampQueue.decreaseParallelism();
						callback(err, tsEntry);
					});
				},
				reduce: (files, tsEntries) => {
					/** @type {undefined | Symlinks} */
					let symlinks;