Function withFile

withFile(
    path: string,
    mode?: string | ((file: HSFile) => any),
    callback?: (file: HSFile) => any,
): any
Open a file, pass it to a function, and close it again afterwards. The file is closed when the function returns, even if it throws (in which case the exception propagates to you). The function must do all its work synchronously: an async function would find the file already closed after its first await. hs.fs.withFile(path, f => ...).
Parameters
- path: string
  Path to the file. ~ is expanded.
- Optionalmode: string | ((file: HSFile) => any)
  The open mode, as for hs.fs.open(). Defaults to "r"; if you omit it, pass the callback in its place.
- Optionalcallback: (file: HSFile) => any
  Called with the open file. Required unless it was passed in place of mode.
Returns any
Whatever callback returns, or null if the file could not be opened or no callback was given (see hs.fs.lastError).