Function updateJsonNestedField

packages/bumpy/src/utils/fs.ts:37–58

(
  filePath: string,
  parentKey: string,
  childKey: string,
  newValue: string,
)

 * e.g., updateJsonNestedField(path, 'dependencies', 'core', '^2.0.0')
 */
export async function updateJsonNestedField(
  filePath: string,
  parentKey: string,
  childKey: string,
  newValue: string,
): Promise<void> {
  let content = await readFile(filePath, 'utf-8');
  const parentEscaped = parentKey.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
  const childEscaped = childKey.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');

  // Find the parent object block and replace the child value within it
  const parentPattern = new RegExp(
    `("${parentEscaped}"\\s*:\\s*\\{)([^}]*)\\}`,
    's', // dotAll so . matches newlines
  );
  content = content.replace(parentPattern, (match, prefix, body) => {
    const childPattern = new RegExp(`("${childEscaped}"\\s*:\\s*)"[^"]*"`);
    const newBody = body.replace(childPattern, `$1"${newValue}"`);
    return `${prefix}${newBody}}`;
  });
  await writeFile(filePath, content, 'utf-8');
}

export async function readText(filePath: string): Promise<string> {
  return readFile(filePath, 'utf-8');