Function readFileIfExists

readFileIfExists(fileName, options?): null | string
读取文件，如果文件不存在则返回null Default use { encoding: 'utf-8' } as options
Parameters
- fileName: string
  filename or file descriptor
- options: undefined | {
  encoding: BufferEncoding;
  flag?: string;
  } = ...
  Options for reading the file
Returns null | string
string if options.encoding is specified, otherwise Buffer
- Defined in util/fs.ts:10

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