removeKey static method

void removeKey(String envPath, String key)

Delete the key line (and the comment immediately above it, if any) from the .env file at envPath.

Idempotent: no-op when the key is absent or the file does not exist.

@param envPath Path to the .env file. @param key Environment variable name to remove.

Implementation

static void removeKey(String envPath, String key) {
  final file = File(envPath);
  if (!file.existsSync()) return;

  final lines = file.readAsLinesSync();
  final keyPrefix = '$key=';
  final keyIndex = _findKeyIndex(lines, keyPrefix);

  if (keyIndex == -1) return;

  // Remove the comment line immediately above the key line, if present.
  if (keyIndex > 0 && lines[keyIndex - 1].startsWith('#')) {
    lines.removeAt(keyIndex - 1);
    // After removal the key line shifted up by one.
    lines.removeAt(keyIndex - 1);
  } else {
    lines.removeAt(keyIndex);
  }

  _writeLines(file, lines);
}