callback = (err, entry) => {
								if (err) {
									if (this.logger) {
										this.logger.debug(
											`Error snapshotting context hash of ${path}: ${err.stack}`
										);
									}
									jobError();
								} else {
									contextHashes.set(path, /** @type {string} */ (entry));
									jobDone();
								}
							}
@param {(WebpackError | null)=} err err
@param {string=} entry entry