src/utils/FileUtils.ts

   1 import { type FSWatcher, type WatchListener, readFileSync, watch } from 'node:fs';
   2
   3 import { handleFileException } from './ErrorUtils';
   4 import { logger } from './Logger';
   5 import { isNotEmptyString } from './Utils';
   6 import type { FileType, JsonType } from '../types';
   7
   8 export const watchJsonFile = <T extends JsonType>(
   9   file: string,
  10   fileType: FileType,
  11   logPrefix: string,
  12   refreshedVariable?: T,
  13   listener: WatchListener<string> = (event, filename) => {
  14     if (isNotEmptyString(filename) && event === 'change') {
  15       try {
  16         logger.debug(`${logPrefix} ${fileType} file ${file} have changed, reload`);
  17         refreshedVariable && (refreshedVariable = JSON.parse(readFileSync(file, 'utf8')) as T);
  18       } catch (error) {
  19         handleFileException(file, fileType, error as NodeJS.ErrnoException, logPrefix, {
  20           throwError: false,
  21         });
  22       }
  23     }
  24   }
  25 ): FSWatcher | undefined => {
  26   if (isNotEmptyString(file)) {
  27     try {
  28       return watch(file, listener);
  29     } catch (error) {
  30       handleFileException(file, fileType, error as NodeJS.ErrnoException, logPrefix, {
  31         throwError: false,
  32       });
  33     }
  34   } else {
  35     logger.info(`${logPrefix} No ${fileType} file to watch given. Not monitoring its changes`);
  36   }
  37 };