Function expandTilde

src/tools/PowerShellTool/pathValidation.ts:820–829

* Expands tilde (~) at the start of a path to the user's home directory.

(filePath: string)

 * Expands tilde (~) at the start of a path to the user's home directory.
 */
function expandTilde(filePath: string): string {
  if (
    filePath === '~' ||
    filePath.startsWith('~/') ||
    filePath.startsWith('~\\')
  ) {
    return homedir() + filePath.slice(1)
  }
  return filePath
}

/**
 * Checks the raw user-provided path (pre-realpath) for dangerous removal