matchers.ts

/**
 * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 */

import getType = require('jest-get-type');
import {
  DIM_COLOR,
  EXPECTED_COLOR,
  MatcherHintOptions,
  RECEIVED_COLOR,
  SUGGEST_TO_CONTAIN_EQUAL,
  ensureExpectedIsNonNegativeInteger,
  ensureNoExpected,
  ensureNumbers,
  getLabelPrinter,
  matcherErrorMessage,
  matcherHint,
  printDiffOrStringify,
  printExpected,
  printReceived,
  printWithType,
  stringify,
} from 'jest-matcher-utils';
import {MatcherState, MatchersObject} from './types';
import {
  printCloseTo,
  printExpectedConstructorName,
  printExpectedConstructorNameNot,
  printReceivedArrayContainExpectedItem,
  printReceivedConstructorName,
  printReceivedConstructorNameNot,
  printReceivedStringContainExpectedResult,
  printReceivedStringContainExpectedSubstring,
} from './print';
import {
  getObjectSubset,
  getPath,
  iterableEquality,
  sparseArrayEquality,
  subsetEquality,
  typeEquality,
} from './utils';
import {equals} from './jasmineUtils';

// Omit colon and one or more spaces, so can call getLabelPrinter.
const EXPECTED_LABEL = 'Expected';
const RECEIVED_LABEL = 'Received';
const EXPECTED_VALUE_LABEL = 'Expected value';
const RECEIVED_VALUE_LABEL = 'Received value';

// The optional property of matcher context is true if undefined.
const isExpand = (expand?: boolean): boolean => expand !== false;

const toStrictEqualTesters = [
  iterableEquality,
  typeEquality,
  sparseArrayEquality,
];

type ContainIterable =
  | Array<unknown>
  | Set<unknown>
  | NodeListOf<any>
  | DOMTokenList
  | HTMLCollectionOf<any>;

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

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

    const message = pass
      ? () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          `Expected: not ${printExpected(expected)}`
      : () => {
          const expectedType = getType(expected);

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

          return (
            matcherHint(matcherName, undefined, undefined, options) +
            '\n\n' +
            (deepEqualityName !== null
              ? DIM_COLOR(
                  `If it should pass with deep equality, replace "${matcherName}" with "${deepEqualityName}"`,
                ) + '\n\n'
              : '') +
            printDiffOrStringify(
              expected,
              received,
              EXPECTED_LABEL,
              RECEIVED_LABEL,
              isExpand(this.expand),
            )
          );
        };

    // Passing the actual and expected objects so that a custom reporter
    // could access them, for example in order to display a custom visual diff,
    // or create a different error message
    return {actual: received, expected, message, name: matcherName, pass};
  },

  toBeCloseTo(
    this: MatcherState,
    received: number,
    expected: number,
    precision: number = 2,
  ) {
    const matcherName = 'toBeCloseTo';
    const secondArgument = arguments.length === 3 ? 'precision' : undefined;
    const isNot = this.isNot;
    const options: MatcherHintOptions = {
      isNot,
      promise: this.promise,
      secondArgument,
      secondArgumentColor: (arg: string) => arg,
    };

    if (typeof expected !== 'number') {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${EXPECTED_COLOR('expected')} value must be a number`,
          printWithType('Expected', expected, printExpected),
        ),
      );
    }

    if (typeof received !== 'number') {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${RECEIVED_COLOR('received')} value must be a number`,
          printWithType('Received', received, printReceived),
        ),
      );
    }

    let pass = false;
    let expectedDiff = 0;
    let receivedDiff = 0;

    if (received === Infinity && expected === Infinity) {
      pass = true; // Infinity - Infinity is NaN
    } else if (received === -Infinity && expected === -Infinity) {
      pass = true; // -Infinity - -Infinity is NaN
    } else {
      expectedDiff = Math.pow(10, -precision) / 2;
      receivedDiff = Math.abs(expected - received);
      pass = receivedDiff < expectedDiff;
    }

    const message = pass
      ? () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          `Expected: not ${printExpected(expected)}\n` +
          (receivedDiff === 0
            ? ''
            : `Received:     ${printReceived(received)}\n` +
              '\n' +
              printCloseTo(receivedDiff, expectedDiff, precision, isNot))
      : () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          `Expected: ${printExpected(expected)}\n` +
          `Received: ${printReceived(received)}\n` +
          '\n' +
          printCloseTo(receivedDiff, expectedDiff, precision, isNot);

    return {message, pass};
  },

  toBeDefined(this: MatcherState, received: unknown, expected: void) {
    const matcherName = 'toBeDefined';
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
    };
    ensureNoExpected(expected, matcherName, options);

    const pass = received !== void 0;

    const message = () =>
      matcherHint(matcherName, undefined, '', options) +
      '\n\n' +
      `Received: ${printReceived(received)}`;

    return {message, pass};
  },

  toBeFalsy(this: MatcherState, received: unknown, expected: void) {
    const matcherName = 'toBeFalsy';
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
    };
    ensureNoExpected(expected, matcherName, options);

    const pass = !received;

    const message = () =>
      matcherHint(matcherName, undefined, '', options) +
      '\n\n' +
      `Received: ${printReceived(received)}`;

    return {message, pass};
  },

  toBeGreaterThan(
    this: MatcherState,
    received: number | bigint,
    expected: number | bigint,
  ) {
    const matcherName = 'toBeGreaterThan';
    const isNot = this.isNot;
    const options: MatcherHintOptions = {
      isNot,
      promise: this.promise,
    };
    ensureNumbers(received, expected, matcherName, options);

    const pass = received > expected;

    const message = () =>
      matcherHint(matcherName, undefined, undefined, options) +
      '\n\n' +
      `Expected:${isNot ? ' not' : ''} > ${printExpected(expected)}\n` +
      `Received:${isNot ? '    ' : ''}   ${printReceived(received)}`;

    return {message, pass};
  },

  toBeGreaterThanOrEqual(
    this: MatcherState,
    received: number | bigint,
    expected: number | bigint,
  ) {
    const matcherName = 'toBeGreaterThanOrEqual';
    const isNot = this.isNot;
    const options: MatcherHintOptions = {
      isNot,
      promise: this.promise,
    };
    ensureNumbers(received, expected, matcherName, options);

    const pass = received >= expected;

    const message = () =>
      matcherHint(matcherName, undefined, undefined, options) +
      '\n\n' +
      `Expected:${isNot ? ' not' : ''} >= ${printExpected(expected)}\n` +
      `Received:${isNot ? '    ' : ''}    ${printReceived(received)}`;

    return {message, pass};
  },

  toBeInstanceOf(this: MatcherState, received: any, expected: Function) {
    const matcherName = 'toBeInstanceOf';
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
    };

    if (typeof expected !== 'function') {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${EXPECTED_COLOR('expected')} value must be a function`,
          printWithType('Expected', expected, printExpected),
        ),
      );
    }

    const pass = received instanceof expected;

    const message = pass
      ? () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          printExpectedConstructorNameNot('Expected constructor', expected) +
          (typeof received.constructor === 'function' &&
          received.constructor !== expected
            ? printReceivedConstructorNameNot(
                'Received constructor',
                received.constructor,
                expected,
              )
            : '')
      : () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          printExpectedConstructorName('Expected constructor', expected) +
          (getType.isPrimitive(received) ||
          Object.getPrototypeOf(received) === null
            ? `\nReceived value has no prototype\nReceived value: ${printReceived(
                received,
              )}`
            : typeof received.constructor !== 'function'
            ? `\nReceived value: ${printReceived(received)}`
            : printReceivedConstructorName(
                'Received constructor',
                received.constructor,
              ));

    return {message, pass};
  },

  toBeLessThan(
    this: MatcherState,
    received: number | bigint,
    expected: number | bigint,
  ) {
    const matcherName = 'toBeLessThan';
    const isNot = this.isNot;
    const options: MatcherHintOptions = {
      isNot,
      promise: this.promise,
    };
    ensureNumbers(received, expected, matcherName, options);

    const pass = received < expected;

    const message = () =>
      matcherHint(matcherName, undefined, undefined, options) +
      '\n\n' +
      `Expected:${isNot ? ' not' : ''} < ${printExpected(expected)}\n` +
      `Received:${isNot ? '    ' : ''}   ${printReceived(received)}`;

    return {message, pass};
  },

  toBeLessThanOrEqual(
    this: MatcherState,
    received: number | bigint,
    expected: number | bigint,
  ) {
    const matcherName = 'toBeLessThanOrEqual';
    const isNot = this.isNot;
    const options: MatcherHintOptions = {
      isNot,
      promise: this.promise,
    };
    ensureNumbers(received, expected, matcherName, options);

    const pass = received <= expected;

    const message = () =>
      matcherHint(matcherName, undefined, undefined, options) +
      '\n\n' +
      `Expected:${isNot ? ' not' : ''} <= ${printExpected(expected)}\n` +
      `Received:${isNot ? '    ' : ''}    ${printReceived(received)}`;

    return {message, pass};
  },

  toBeNaN(this: MatcherState, received: any, expected: void) {
    const matcherName = 'toBeNaN';
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
    };
    ensureNoExpected(expected, matcherName, options);

    const pass = Number.isNaN(received);

    const message = () =>
      matcherHint(matcherName, undefined, '', options) +
      '\n\n' +
      `Received: ${printReceived(received)}`;

    return {message, pass};
  },

  toBeNull(this: MatcherState, received: unknown, expected: void) {
    const matcherName = 'toBeNull';
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
    };
    ensureNoExpected(expected, matcherName, options);

    const pass = received === null;

    const message = () =>
      matcherHint(matcherName, undefined, '', options) +
      '\n\n' +
      `Received: ${printReceived(received)}`;

    return {message, pass};
  },

  toBeTruthy(this: MatcherState, received: unknown, expected: void) {
    const matcherName = 'toBeTruthy';
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
    };
    ensureNoExpected(expected, matcherName, options);

    const pass = !!received;

    const message = () =>
      matcherHint(matcherName, undefined, '', options) +
      '\n\n' +
      `Received: ${printReceived(received)}`;

    return {message, pass};
  },

  toBeUndefined(this: MatcherState, received: unknown, expected: void) {
    const matcherName = 'toBeUndefined';
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
    };
    ensureNoExpected(expected, matcherName, options);

    const pass = received === void 0;

    const message = () =>
      matcherHint(matcherName, undefined, '', options) +
      '\n\n' +
      `Received: ${printReceived(received)}`;

    return {message, pass};
  },

  toContain(
    this: MatcherState,
    received: ContainIterable | string,
    expected: unknown,
  ) {
    const matcherName = 'toContain';
    const isNot = this.isNot;
    const options: MatcherHintOptions = {
      comment: 'indexOf',
      isNot,
      promise: this.promise,
    };

    if (received == null) {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${RECEIVED_COLOR('received')} value must not be null nor undefined`,
          printWithType('Received', received, printReceived),
        ),
      );
    }

    if (typeof received === 'string') {
      const index = received.indexOf(String(expected));
      const pass = index !== -1;

      const message = () => {
        const labelExpected = `Expected ${
          typeof expected === 'string' ? 'substring' : 'value'
        }`;
        const labelReceived = 'Received string';
        const printLabel = getLabelPrinter(labelExpected, labelReceived);

        return (
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          `${printLabel(labelExpected)}${isNot ? 'not ' : ''}${printExpected(
            expected,
          )}\n` +
          `${printLabel(labelReceived)}${isNot ? '    ' : ''}${
            isNot
              ? printReceivedStringContainExpectedSubstring(
                  received,
                  index,
                  String(expected).length,
                )
              : printReceived(received)
          }`
        );
      };

      return {message, pass};
    }

    const indexable = Array.from(received);
    const index = indexable.indexOf(expected);
    const pass = index !== -1;

    const message = () => {
      const labelExpected = 'Expected value';
      const labelReceived = `Received ${getType(received)}`;
      const printLabel = getLabelPrinter(labelExpected, labelReceived);

      return (
        matcherHint(matcherName, undefined, undefined, options) +
        '\n\n' +
        `${printLabel(labelExpected)}${isNot ? 'not ' : ''}${printExpected(
          expected,
        )}\n` +
        `${printLabel(labelReceived)}${isNot ? '    ' : ''}${
          isNot && Array.isArray(received)
            ? printReceivedArrayContainExpectedItem(received, index)
            : printReceived(received)
        }` +
        (!isNot &&
        indexable.findIndex(item =>
          equals(item, expected, [iterableEquality]),
        ) !== -1
          ? `\n\n${SUGGEST_TO_CONTAIN_EQUAL}`
          : '')
      );
    };

    return {message, pass};
  },

  toContainEqual(
    this: MatcherState,
    received: ContainIterable,
    expected: unknown,
  ) {
    const matcherName = 'toContainEqual';
    const isNot = this.isNot;
    const options: MatcherHintOptions = {
      comment: 'deep equality',
      isNot,
      promise: this.promise,
    };

    if (received == null) {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${RECEIVED_COLOR('received')} value must not be null nor undefined`,
          printWithType('Received', received, printReceived),
        ),
      );
    }

    const index = Array.from(received).findIndex(item =>
      equals(item, expected, [iterableEquality]),
    );
    const pass = index !== -1;

    const message = () => {
      const labelExpected = 'Expected value';
      const labelReceived = `Received ${getType(received)}`;
      const printLabel = getLabelPrinter(labelExpected, labelReceived);

      return (
        matcherHint(matcherName, undefined, undefined, options) +
        '\n\n' +
        `${printLabel(labelExpected)}${isNot ? 'not ' : ''}${printExpected(
          expected,
        )}\n` +
        `${printLabel(labelReceived)}${isNot ? '    ' : ''}${
          isNot && Array.isArray(received)
            ? printReceivedArrayContainExpectedItem(received, index)
            : printReceived(received)
        }`
      );
    };

    return {message, pass};
  },

  toEqual(this: MatcherState, received: unknown, expected: unknown) {
    const matcherName = 'toEqual';
    const options: MatcherHintOptions = {
      comment: 'deep equality',
      isNot: this.isNot,
      promise: this.promise,
    };

    const pass = equals(received, expected, [iterableEquality]);

    const message = pass
      ? () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          `Expected: not ${printExpected(expected)}\n` +
          (stringify(expected) !== stringify(received)
            ? `Received:     ${printReceived(received)}`
            : '')
      : () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          printDiffOrStringify(
            expected,
            received,
            EXPECTED_LABEL,
            RECEIVED_LABEL,
            isExpand(this.expand),
          );

    // Passing the actual and expected objects so that a custom reporter
    // could access them, for example in order to display a custom visual diff,
    // or create a different error message
    return {actual: received, expected, message, name: matcherName, pass};
  },

  toHaveLength(this: MatcherState, received: any, expected: number) {
    const matcherName = 'toHaveLength';
    const isNot = this.isNot;
    const options: MatcherHintOptions = {
      isNot,
      promise: this.promise,
    };

    if (
      typeof received !== 'string' &&
      (!received || typeof received.length !== 'number')
    ) {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${RECEIVED_COLOR(
            'received',
          )} value must have a length property whose value must be a number`,
          printWithType('Received', received, printReceived),
        ),
      );
    }

    ensureExpectedIsNonNegativeInteger(expected, matcherName, options);

    const pass = received.length === expected;

    const message = () => {
      const labelExpected = 'Expected length';
      const labelReceivedLength = 'Received length';
      const labelReceivedValue = `Received ${getType(received)}`;
      const printLabel = getLabelPrinter(
        labelExpected,
        labelReceivedLength,
        labelReceivedValue,
      );

      return (
        matcherHint(matcherName, undefined, undefined, options) +
        '\n\n' +
        `${printLabel(labelExpected)}${isNot ? 'not ' : ''}${printExpected(
          expected,
        )}\n` +
        (isNot
          ? ''
          : `${printLabel(labelReceivedLength)}${printReceived(
              received.length,
            )}\n`) +
        `${printLabel(labelReceivedValue)}${isNot ? '    ' : ''}${printReceived(
          received,
        )}`
      );
    };

    return {message, pass};
  },

  toHaveProperty(
    this: MatcherState,
    received: object,
    expectedPath: string | Array<string>,
    expectedValue?: unknown,
  ) {
    const matcherName = 'toHaveProperty';
    const expectedArgument = 'path';
    const hasValue = arguments.length === 3;
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
      secondArgument: hasValue ? 'value' : '',
    };

    if (received === null || received === undefined) {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, expectedArgument, options),
          `${RECEIVED_COLOR('received')} value must not be null nor undefined`,
          printWithType('Received', received, printReceived),
        ),
      );
    }

    const expectedPathType = getType(expectedPath);

    if (expectedPathType !== 'string' && expectedPathType !== 'array') {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, expectedArgument, options),
          `${EXPECTED_COLOR('expected')} path must be a string or array`,
          printWithType('Expected', expectedPath, printExpected),
        ),
      );
    }

    const expectedPathLength =
      typeof expectedPath === 'string'
        ? expectedPath.split('.').length
        : expectedPath.length;

    if (expectedPathType === 'array' && expectedPathLength === 0) {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, expectedArgument, options),
          `${EXPECTED_COLOR('expected')} path must not be an empty array`,
          printWithType('Expected', expectedPath, printExpected),
        ),
      );
    }

    const result = getPath(received, expectedPath);
    const {lastTraversedObject, hasEndProp} = result;
    const receivedPath = result.traversedPath;
    const hasCompletePath = receivedPath.length === expectedPathLength;
    const receivedValue = hasCompletePath ? result.value : lastTraversedObject;

    const pass = hasValue
      ? equals(result.value, expectedValue, [iterableEquality])
      : Boolean(hasEndProp); // theoretically undefined if empty path
    // Remove type cast if we rewrite getPath as iterative algorithm.

    // Delete this unique report if future breaking change
    // removes the edge case that expected value undefined
    // also matches absence of a property with the key path.
    if (pass && !hasCompletePath) {
      const message = () =>
        matcherHint(matcherName, undefined, expectedArgument, options) +
        '\n\n' +
        `Expected path: ${printExpected(expectedPath)}\n` +
        `Received path: ${printReceived(
          expectedPathType === 'array' || receivedPath.length === 0
            ? receivedPath
            : receivedPath.join('.'),
        )}\n\n` +
        `Expected value: not ${printExpected(expectedValue)}\n` +
        `Received value:     ${printReceived(receivedValue)}\n\n` +
        DIM_COLOR(
          'Because a positive assertion passes for expected value undefined if the property does not exist, this negative assertion fails unless the property does exist and has a defined value',
        );

      return {message, pass};
    }

    const message = pass
      ? () =>
          matcherHint(matcherName, undefined, expectedArgument, options) +
          '\n\n' +
          (hasValue
            ? `Expected path: ${printExpected(expectedPath)}\n\n` +
              `Expected value: not ${printExpected(expectedValue)}` +
              (stringify(expectedValue) !== stringify(receivedValue)
                ? `\nReceived value:     ${printReceived(receivedValue)}`
                : '')
            : `Expected path: not ${printExpected(expectedPath)}\n\n` +
              `Received value: ${printReceived(receivedValue)}`)
      : () =>
          matcherHint(matcherName, undefined, expectedArgument, options) +
          '\n\n' +
          `Expected path: ${printExpected(expectedPath)}\n` +
          (hasCompletePath
            ? '\n' +
              printDiffOrStringify(
                expectedValue,
                receivedValue,
                EXPECTED_VALUE_LABEL,
                RECEIVED_VALUE_LABEL,
                isExpand(this.expand),
              )
            : `Received path: ${printReceived(
                expectedPathType === 'array' || receivedPath.length === 0
                  ? receivedPath
                  : receivedPath.join('.'),
              )}\n\n` +
              (hasValue
                ? `Expected value: ${printExpected(expectedValue)}\n`
                : '') +
              `Received value: ${printReceived(receivedValue)}`);

    return {message, pass};
  },

  toMatch(this: MatcherState, received: string, expected: string | RegExp) {
    const matcherName = 'toMatch';
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
    };

    if (typeof received !== 'string') {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${RECEIVED_COLOR('received')} value must be a string`,
          printWithType('Received', received, printReceived),
        ),
      );
    }

    if (
      !(typeof expected === 'string') &&
      !(expected && typeof expected.test === 'function')
    ) {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${EXPECTED_COLOR(
            'expected',
          )} value must be a string or regular expression`,
          printWithType('Expected', expected, printExpected),
        ),
      );
    }

    const pass =
      typeof expected === 'string'
        ? received.includes(expected)
        : new RegExp(expected).test(received);

    const message = pass
      ? () =>
          typeof expected === 'string'
            ? matcherHint(matcherName, undefined, undefined, options) +
              '\n\n' +
              `Expected substring: not ${printExpected(expected)}\n` +
              `Received string:        ${printReceivedStringContainExpectedSubstring(
                received,
                received.indexOf(expected),
                expected.length,
              )}`
            : matcherHint(matcherName, undefined, undefined, options) +
              '\n\n' +
              `Expected pattern: not ${printExpected(expected)}\n` +
              `Received string:      ${printReceivedStringContainExpectedResult(
                received,
                typeof expected.exec === 'function'
                  ? expected.exec(received)
                  : null,
              )}`
      : () => {
          const labelExpected = `Expected ${
            typeof expected === 'string' ? 'substring' : 'pattern'
          }`;
          const labelReceived = 'Received string';
          const printLabel = getLabelPrinter(labelExpected, labelReceived);

          return (
            matcherHint(matcherName, undefined, undefined, options) +
            '\n\n' +
            `${printLabel(labelExpected)}${printExpected(expected)}\n` +
            `${printLabel(labelReceived)}${printReceived(received)}`
          );
        };

    return {message, pass};
  },

  toMatchObject(this: MatcherState, received: object, expected: object) {
    const matcherName = 'toMatchObject';
    const options: MatcherHintOptions = {
      isNot: this.isNot,
      promise: this.promise,
    };

    if (typeof received !== 'object' || received === null) {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${RECEIVED_COLOR('received')} value must be a non-null object`,
          printWithType('Received', received, printReceived),
        ),
      );
    }

    if (typeof expected !== 'object' || expected === null) {
      throw new Error(
        matcherErrorMessage(
          matcherHint(matcherName, undefined, undefined, options),
          `${EXPECTED_COLOR('expected')} value must be a non-null object`,
          printWithType('Expected', expected, printExpected),
        ),
      );
    }

    const pass = equals(received, expected, [iterableEquality, subsetEquality]);

    const message = pass
      ? () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          `Expected: not ${printExpected(expected)}` +
          (stringify(expected) !== stringify(received)
            ? `\nReceived:     ${printReceived(received)}`
            : '')
      : () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          printDiffOrStringify(
            expected,
            getObjectSubset(received, expected),
            EXPECTED_LABEL,
            RECEIVED_LABEL,
            isExpand(this.expand),
          );

    return {message, pass};
  },

  toStrictEqual(this: MatcherState, received: unknown, expected: unknown) {
    const matcherName = 'toStrictEqual';
    const options: MatcherHintOptions = {
      comment: 'deep equality',
      isNot: this.isNot,
      promise: this.promise,
    };

    const pass = equals(received, expected, toStrictEqualTesters, true);

    const message = pass
      ? () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          `Expected: not ${printExpected(expected)}\n` +
          (stringify(expected) !== stringify(received)
            ? `Received:     ${printReceived(received)}`
            : '')
      : () =>
          matcherHint(matcherName, undefined, undefined, options) +
          '\n\n' +
          printDiffOrStringify(
            expected,
            received,
            EXPECTED_LABEL,
            RECEIVED_LABEL,
            isExpand(this.expand),
          );

    // Passing the actual and expected objects so that a custom reporter
    // could access them, for example in order to display a custom visual diff,
    // or create a different error message
    return {actual: received, expected, message, name: matcherName, pass};
  },
};

export default matchers;