Function toBe

packages/expect/src/matchers.ts:75–140

(received: unknown, expected: unknown)

const matchers: MatchersObject = {
  toBe(received: unknown, expected: unknown) {
    const matcherName = class="st">'toBe';
    const options: MatcherHintOptions = {
      comment: class="st">'Object.is equality',
      isNot: this.isNot,
      promise: this.promise,
    };

    const pass = Object.is(received, expected);

    const message = pass
      ? () =>
          class="cm">// eslint-disable-next-line prefer-template
          matcherHint(matcherName, undefined, undefined, options) +
          class="st">'\n\n' +
          `Expected: not ${printExpected(expected)}`
      : () => {
          const expectedType = getType(expected);

          let deepEqualityName = null;
          if (expectedType !== class="st">'map' && expectedType !== class="st">'set') {
            class="cm">// If deep equality passes when referential identity fails,
            class="cm">// but exclude map and set until review of their equality logic.
            if (
              equals(
                received,
                expected,
                [...this.customTesters, ...toStrictEqualTesters],
                true,
              )
            ) {
              deepEqualityName = class="st">'toStrictEqual';
            } else if (
              equals(received, expected, [
                ...this.customTesters,
                iterableEquality,
              ])
            ) {
              deepEqualityName = class="st">'toEqual';
            }
          }

          return (
            class="cm">// eslint-disable-next-line prefer-template
            matcherHint(matcherName, undefined, undefined, options) +
            class="st">'\n\n' +
            (deepEqualityName === null
              ? class="st">''
              : `${DIM_COLOR(
                  `If it should pass with deep equality, replace class="st">"${matcherName}" with class="st">"${deepEqualityName}"`,
                )}\n\n`) +
            printDiffOrStringify(
              expected,
              received,
              EXPECTED_LABEL,
              RECEIVED_LABEL,
              isExpand(this.expand),
            )