src/vs/workbench/services/workingCopy/common/workingCopyHistoryService.ts/WorkingCopyHistoryModel/readEntriesFile
class WorkingCopyHistoryModel:	private async readEntriesFile(): Promise<ISerializedWorkingCopyHistoryModel | undefined> {
		const historyEntriesListingFile = assertIsDefined(this.historyEntriesListingFile);

		let serializedModel: ISerializedWorkingCopyHistoryModel | undefined = undefined;
		try {
			serializedModel = JSON.parse((await this.fileService.readFile(historyEntriesListingFile)).value.toString());
		} catch (error) {
			if (!(error instanceof FileOperationError && error.fileOperationResult === FileOperationResult.FILE_NOT_FOUND)) {
				this.traceError(error);
			}
		}

		return serializedModel;
	}