message: Small cleanups.
diff: 'use strict';
  +import type {DiffOptions} from 'jest-diff/src/diffStrings';
  +
  const {
  printReceived,
  printExpected,
  @@ -17,15 +19,15 @@ const {
  const chalk = require('chalk');
  const diff = require('jest-diff');
  -declare class AssertionError extends Error {
  - name: string,
  +type AssertionError = {|
  actual: ?string,
  expected: ?string,
  - operator: ?string,
  - message: string,
  generatedMessage: boolean,
  -}
  -import type {DiffOptions} from 'jest-diff/src/diffStrings';
  + message: string,
  + name: string,
  + operator: ?string,
  + stack: string,
  +|};
  const assertOperatorsMap = {
  '!=': 'notEqual',
  