Function make

test/FileSystemInfo.unittest.js:1121–1132

(
				/** @type {string[]} */ fileList,
				/** @type {(err?: Error | null, snapshot?: Snapshot | null) => void} */ cb
			)

			class="cm">// Fixed start time so the shared-snapshot start-time guard always passes.
			const startTime = Date.now() + 10000;
			const make = (
				/** @type {string[]} */ fileList,
				/** @type {(err?: Error | null, snapshot?: Snapshot | null) => void} */ cb
			) =>
				fsInfo.createSnapshot(
					startTime,
					fileList,
					[],
					[],
					{ timestamp: true },
					cb
				);
			class="cm">// 1st + 2nd identical snapshots create a shared common snapshot.
			make(files, (/** @type {Error | null | undefined} */ err) => {
				if (err) return done(err);