deepseek-ai/deepseek-harness · error · FsError

FS_EDIT_NOT_FOUND

FS_EDIT_NOT_FOUND

Error message

old_string must be a non-empty string

What it means

Error "old_string must be a non-empty string" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/fs/fs-local/src/fsio.ts:768

 * `FS_EDIT_NOT_FOUND`; multiple matches throw `FS_AMBIGUOUS_EDIT` unless `replaceAll` is true.
 * @param content - the current file content, already LF-normalized.
 * @param oldString - literal text to find; CRLF inside it is normalized to LF before
 *   matching.
 * @param newString - literal replacement text, normalized the same way.
 * @param replaceAll - replace every match instead of requiring exactly one.
 * @param displayPath - the caller-facing path used in error messages.
 * @returns the edited LF-normalized content plus how many occurrences were replaced.
 */
export function applyLiteralEdit(
  content: string,
  oldString: string,
  newString: string,
  replaceAll: boolean,
  displayPath: string,
): { content: string; replacements: number } {
  const oldNorm = normalizeLineEndings(oldString)
  if (oldNorm.length === 0) {
    throw new FsError('old_string must be a non-empty string', 'FS_EDIT_NOT_FOUND')
  }
  const newNorm = normalizeLineEndings(newString)
  const replacements = countOccurrences(content, oldNorm)
  if (replacements === 0) {
    throw new FsError(`old_string was not found in "${displayPath}"`, 'FS_EDIT_NOT_FOUND')
  }
  if (!replaceAll && replacements > 1) {
    throw new FsError(`old_string matched ${replacements} times in "${displayPath}"; provide a more specific old_string or set replace_all to true`, 'FS_AMBIGUOUS_EDIT')
  }
  return { content: content.split(oldNorm).join(newNorm), replacements }
}

export { normalizeLineEndings, restoreLineEndings }

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/fs/fs-local/src/fsio.ts:768 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/157c533dac975100. Report an issue: GitHub.