Function describeObjectForErrorMessage

packages/shared/ReactSerializationErrors.js:177–321

(
  objectOrArray: {+[key: string | number]: mixed, ...} | $ReadOnlyArray<mixed>,
  expandedName?: string,
)

}

export function describeObjectForErrorMessage(
  objectOrArray: {+[key: string | number]: mixed, ...} | $ReadOnlyArray<mixed>,
  expandedName?: string,
): string {
  const objKind = objectName(objectOrArray);
  if (objKind !== 'Object' && objKind !== 'Array') {
    return objKind;
  }
  let str = '';
  let start = -1;
  let length = 0;
  if (isArray(objectOrArray)) {
    if (__DEV__ && jsxChildrenParents.has(objectOrArray)) {
      // Print JSX Children
      const type = jsxChildrenParents.get(objectOrArray);
      str = '<' + describeElementType(type) + '>';
      const array: $ReadOnlyArray<mixed> = objectOrArray;
      for (let i = 0; i < array.length; i++) {
        const value = array[i];
        let substr;
        if (typeof value === 'string') {
          substr = value;
        } else if (typeof value === 'object' && value !== null) {
          substr = '{' + describeObjectForErrorMessage(value) + '}';
        } else {
          substr = '{' + describeValueForErrorMessage(value) + '}';
        }
        if ('' + i === expandedName) {
          start = str.length;
          length = substr.length;
          str += substr;
        } else if (substr.length < 15 && str.length + substr.length < 40) {
          str += substr;
        } else {
          str += '{...}';
        }
      }
      str += '</' + describeElementType(type) + '>';
    } else {
      // Print Array
      str = '[';
      const array: $ReadOnlyArray<mixed> = objectOrArray;
      for (let i = 0; i < array.length; i++) {
        if (i > 0) {
          str += ', ';
        }
        const value = array[i];
        let substr;
        if (typeof value === 'object' && value !== null) {
          substr = describeObjectForErrorMessage(value);
        } else {
          substr = describeValueForErrorMessage(value);
        }
        if ('' + i === expandedName) {
          start = str.length;
          length = substr.length;
          str += substr;
        } else if (substr.length < 10 && str.length + substr.length < 40) {