Method _readFileHash

lib/FileSystemInfo.js:3675–3705

* @private * @type {Processor }

(path, callback)

	 * @type {Processor<string, string>}
	 */
	_readFileHash(path, callback) {
		this.fs.readFile(path, (err, content) => {
			if (err) {
				if (err.code === "EISDIR") {
					this._fileHashes.set(path, "directory");
					return callback(null, "directory");
				}
				if (err.code === "ENOENT") {
					this._fileHashes.set(path, null);
					return callback(null, null);
				}
				if (err.code === "ERR_FS_FILE_TOO_LARGE") {
					/** @type {Logger} */
					(this.logger).warn(`Ignoring ${path} for hashing as it's very large`);
					this._fileHashes.set(path, "too large");
					return callback(null, "too large");
				}
				return callback(/** @type {WebpackError} */ (err));
			}

			const hash = createHash(this._hashFunction);

			hash.update(/** @type {string | Buffer} */ (content));

			const digest = hash.digest("hex");

			this._fileHashes.set(path, digest);

			callback(null, digest);
		});
	}

	/**
	 * Get file timestamp and hash.