Function testHeading

tools/doc/deprecationCodes.mjs:25–35

(headingNode, expectedDeprecationCode)

};

const testHeading = (headingNode, expectedDeprecationCode) => {
  try {
    assert.strictEqual(
      headingNode?.children[0]?.value.substring(0, 9),
      `${expectedDeprecationCode}: `,
      'Ill-formed or out-of-order deprecation code.',
    );
  } catch (e) {
    throw addMarkdownPathToErrorStack(e, headingNode);
  }
};

const testYAMLComment = (commentNode) => {
  try {