@types/jest/index.d.ts

TypeScript definitions for Jest

// Type definitions for Jest 25.2
// Project: https://jestjs.io/
// Definitions by: Asana (https://asana.com)
//                 Ivo Stratev <https://github.com/NoHomey>
//                 jwbay <https://github.com/jwbay>
//                 Alexey Svetliakov <https://github.com/asvetliakov>
//                 Alex Jover Morales <https://github.com/alexjoverm>
//                 Allan Lukwago <https://github.com/epicallan>
//                 Ika <https://github.com/ikatyang>
//                 Waseem Dahman <https://github.com/wsmd>
//                 Jamie Mason <https://github.com/JamieMason>
//                 Douglas Duteil <https://github.com/douglasduteil>
//                 Ahn <https://github.com/ahnpnl>
//                 Josh Goldberg <https://github.com/joshuakgoldberg>
//                 Jeff Lau <https://github.com/UselessPickles>
//                 Andrew Makarov <https://github.com/r3nya>
//                 Martin Hochel <https://github.com/hotell>
//                 Sebastian Sebald <https://github.com/sebald>
//                 Andy <https://github.com/andys8>
//                 Antoine Brault <https://github.com/antoinebrault>
//                 Jeroen Claassens <https://github.com/favna>
//                 Gregor Stamać <https://github.com/gstamac>
//                 ExE Boss <https://github.com/ExE-Boss>
//                 Alex Bolenok <https://github.com/quassnoi>
//                 Mario Beltrán Alarcón <https://github.com/Belco90>
//                 Tony Hallett <https://github.com/tonyhallett>
//                 Jason Yu <https://github.com/ycmjason>
//                 Devansh Jethmalani <https://github.com/devanshj>
//                 Pawel Fajfer <https://github.com/pawfa>
//                 Regev Brody <https://github.com/regevbr>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
// TypeScript Version: 3.1

declare var beforeAll: jest.Lifecycle;
declare var beforeEach: jest.Lifecycle;
declare var afterAll: jest.Lifecycle;
declare var afterEach: jest.Lifecycle;
declare var describe: jest.Describe;
declare var fdescribe: jest.Describe;
declare var xdescribe: jest.Describe;
declare var it: jest.It;
declare var fit: jest.It;
declare var xit: jest.It;
declare var test: jest.It;
declare var xtest: jest.It;

declare const expect: jest.Expect;

type ExtractEachCallbackArgs<T extends ReadonlyArray<any>> = {
    1: [T[0]],
    2: [T[0], T[1]],
    3: [T[0], T[1], T[2]],
    4: [T[0], T[1], T[2], T[3]],
    5: [T[0], T[1], T[2], T[3], T[4]],
    6: [T[0], T[1], T[2], T[3], T[4], T[5]],
    7: [T[0], T[1], T[2], T[3], T[4], T[5], T[6]],
    8: [T[0], T[1], T[2], T[3], T[4], T[5], T[6], T[7]],
    9: [T[0], T[1], T[2], T[3], T[4], T[5], T[6], T[7], T[8]],
    10: [T[0], T[1], T[2], T[3], T[4], T[5], T[6], T[7], T[8], T[9]],
    'fallback': Array<(T extends ReadonlyArray<infer U>? U: any)>
}[
    T extends Readonly<[any]> ? 1
        : T extends Readonly<[any, any]> ? 2
        : T extends Readonly<[any, any, any]> ? 3
        : T extends Readonly<[any, any, any, any]> ? 4
        : T extends Readonly<[any, any, any, any, any]> ? 5
        : T extends Readonly<[any, any, any, any, any, any]> ? 6
        : T extends Readonly<[any, any, any, any, any, any, any]> ? 7
        : T extends Readonly<[any, any, any, any, any, any, any, any]> ? 8
        : T extends Readonly<[any, any, any, any, any, any, any, any, any]> ? 9
        : T extends Readonly<[any, any, any, any, any, any, any, any, any, any]> ? 10
        : 'fallback'
];

interface NodeRequire {
    /**
     * Returns the actual module instead of a mock, bypassing all checks on
     * whether the module should receive a mock implementation or not.
     *
     * @deprecated Use `jest.requireActual` instead.
     */
    requireActual(moduleName: string): any;
    /**
     * Returns a mock module instead of the actual module, bypassing all checks
     * on whether the module should be required normally or not.
     *
     * @deprecated Use `jest.requireMock`instead.
     */
    requireMock(moduleName: string): any;
}

declare namespace jest {
    /**
     * Provides a way to add Jasmine-compatible matchers into your Jest context.
     */
    function addMatchers(matchers: jasmine.CustomMatcherFactories): typeof jest;
    /**
     * Disables automatic mocking in the module loader.
     */
    function autoMockOff(): typeof jest;
    /**
     * Enables automatic mocking in the module loader.
     */
    function autoMockOn(): typeof jest;
    /**
     * Clears the mock.calls and mock.instances properties of all mocks.
     * Equivalent to calling .mockClear() on every mocked function.
     */
    function clearAllMocks(): typeof jest;
    /**
     * Resets the state of all mocks.
     * Equivalent to calling .mockReset() on every mocked function.
     */
    function resetAllMocks(): typeof jest;
    /**
     * available since Jest 21.1.0
     * Restores all mocks back to their original value.
     * Equivalent to calling .mockRestore on every mocked function.
     * Beware that jest.restoreAllMocks() only works when mock was created with
     * jest.spyOn; other mocks will require you to manually restore them.
     */
    function restoreAllMocks(): typeof jest;
    /**
     * Removes any pending timers from the timer system. If any timers have
     * been scheduled, they will be cleared and will never have the opportunity
     * to execute in the future.
     */
    function clearAllTimers(): typeof jest;
    /**
     * Returns the number of fake timers still left to run.
     */
    function getTimerCount(): number;
    /**
     * Indicates that the module system should never return a mocked version
     * of the specified module, including all of the specificied module's dependencies.
     */
    function deepUnmock(moduleName: string): typeof jest;
    /**
     * Disables automatic mocking in the module loader.
     */
    function disableAutomock(): typeof jest;
    /**
     * Mocks a module with an auto-mocked version when it is being required.
     */
    function doMock(moduleName: string, factory?: () => unknown, options?: MockOptions): typeof jest;
    /**
     * Indicates that the module system should never return a mocked version
     * of the specified module from require() (e.g. that it should always return the real module).
     */
    function dontMock(moduleName: string): typeof jest;
    /**
     * Enables automatic mocking in the module loader.
     */
    function enableAutomock(): typeof jest;
    /**
     * Creates a mock function. Optionally takes a mock implementation.
     */
    function fn(): Mock;
    /**
     * Creates a mock function. Optionally takes a mock implementation.
     */
    function fn<T, Y extends any[]>(implementation?: (...args: Y) => T): Mock<T, Y>;
    /**
     * Use the automatic mocking system to generate a mocked version of the given module.
     */
    function genMockFromModule<T>(moduleName: string): T;
    /**
     * Returns whether the given function is a mock function.
     */
    function isMockFunction(fn: any): fn is Mock;
    /**
     * Mocks a module with an auto-mocked version when it is being required.
     */
    function mock(moduleName: string, factory?: () => unknown, options?: MockOptions): typeof jest;
    /**
     * Returns the actual module instead of a mock, bypassing all checks on
     * whether the module should receive a mock implementation or not.
     */
    function requireActual<TModule = any>(moduleName: string): TModule;
    /**
     * Returns a mock module instead of the actual module, bypassing all checks
     * on whether the module should be required normally or not.
     */
    function requireMock<TModule = any>(moduleName: string): TModule;
    /**
     * Resets the module registry - the cache of all required modules. This is
     * useful to isolate modules where local state might conflict between tests.
     */
    function resetModuleRegistry(): typeof jest;
    /**
     * Resets the module registry - the cache of all required modules. This is
     * useful to isolate modules where local state might conflict between tests.
     */
    function resetModules(): typeof jest;
    /**
     * Creates a sandbox registry for the modules that are loaded inside the callback function..
     * This is useful to isolate specific modules for every test so that local module state doesn't conflict between tests.
     */
    function isolateModules(fn: () => void): typeof jest;
    /**
     * Runs failed tests n-times until they pass or until the max number of retries is exhausted.
     * This only works with jest-circus!
     */
    function retryTimes(numRetries: number): typeof jest;
    /**
     * Exhausts tasks queued by setImmediate().
     */
    function runAllImmediates(): typeof jest;
    /**
     * Exhausts the micro-task queue (usually interfaced in node via process.nextTick).
     */
    function runAllTicks(): typeof jest;
    /**
     * Exhausts the macro-task queue (i.e., all tasks queued by setTimeout() and setInterval()).
     */
    function runAllTimers(): typeof jest;
    /**
     * Executes only the macro-tasks that are currently pending (i.e., only the
     * tasks that have been queued by setTimeout() or setInterval() up to this point).
     * If any of the currently pending macro-tasks schedule new macro-tasks,
     * those new tasks will not be executed by this call.
     */
    function runOnlyPendingTimers(): typeof jest;
    /**
     * (renamed to `advanceTimersByTime` in Jest 21.3.0+) Executes only the macro
     * task queue (i.e. all tasks queued by setTimeout() or setInterval() and setImmediate()).
     */
    function runTimersToTime(msToRun: number): typeof jest;
    /**
     * Advances all timers by msToRun milliseconds. All pending "macro-tasks" that have been
     * queued via setTimeout() or setInterval(), and would be executed within this timeframe
     * will be executed.
     */
    function advanceTimersByTime(msToRun: number): typeof jest;
    /**
     * Advances all timers by the needed milliseconds so that only the next
     * timeouts/intervals will run. Optionally, you can provide steps, so it
     * will run steps amount of next timeouts/intervals.
     */
    function advanceTimersToNextTimer(step?: number): void;
    /**
     * Explicitly supplies the mock object that the module system should return
     * for the specified module.
     */
    function setMock<T>(moduleName: string, moduleExports: T): typeof jest;
    /**
     * Set the default timeout interval for tests and before/after hooks in milliseconds.
     * Note: The default timeout interval is 5 seconds if this method is not called.
     */
    function setTimeout(timeout: number): typeof jest;
    /**
     * Creates a mock function similar to jest.fn but also tracks calls to `object[methodName]`
     *
     * Note: By default, jest.spyOn also calls the spied method. This is different behavior from most
     * other test libraries.
     *
     * @example
     *
     * const video = require('./video');
     *
     * test('plays video', () => {
     *   const spy = jest.spyOn(video, 'play');
     *   const isPlaying = video.play();
     *
     *   expect(spy).toHaveBeenCalled();
     *   expect(isPlaying).toBe(true);
     *
     *   spy.mockReset();
     *   spy.mockRestore();
     * });
     */
    function spyOn<T extends {}, M extends NonFunctionPropertyNames<Required<T>>>(
        object: T,
        method: M,
        accessType: 'get'
    ): SpyInstance<Required<T>[M], []>;
    function spyOn<T extends {}, M extends NonFunctionPropertyNames<Required<T>>>(
        object: T,
        method: M,
        accessType: 'set'
    ): SpyInstance<void, [Required<T>[M]]>;
    function spyOn<T extends {}, M extends FunctionPropertyNames<Required<T>>>(
        object: T,
        method: M
    ): Required<T>[M] extends (...args: any[]) => any
        ? SpyInstance<ReturnType<Required<T>[M]>, ArgsType<Required<T>[M]>>
        : never;
    function spyOn<T extends {}, M extends ConstructorPropertyNames<Required<T>>>(
        object: T,
        method: M
    ): Required<T>[M] extends new (...args: any[]) => any
        ? SpyInstance<InstanceType<Required<T>[M]>, ConstructorArgsType<Required<T>[M]>>
        : never;
    /**
     * Indicates that the module system should never return a mocked version of
     * the specified module from require() (e.g. that it should always return the real module).
     */
    function unmock(moduleName: string): typeof jest;
    /**
     * Instructs Jest to use fake versions of the standard timer functions.
     */
    function useFakeTimers(): typeof jest;
    /**
     * Instructs Jest to use the real versions of the standard timer functions.
     */
    function useRealTimers(): typeof jest;

    interface MockOptions {
        virtual?: boolean;
    }

    type EmptyFunction = () => void;
    type ArgsType<T> = T extends (...args: infer A) => any ? A : never;
    type ConstructorArgsType<T> = T extends new (...args: infer A) => any ? A : never;
    type RejectedValue<T> = T extends PromiseLike<any> ? any : never;
    type ResolvedValue<T> = T extends PromiseLike<infer U> ? U | T : never;
    // see https://github.com/Microsoft/TypeScript/issues/25215
    type NonFunctionPropertyNames<T> = { [K in keyof T]: T[K] extends (...args: any[]) => any ? never : K }[keyof T] &
        string;
    type FunctionPropertyNames<T> = { [K in keyof T]: T[K] extends (...args: any[]) => any ? K : never }[keyof T] &
        string;
    type ConstructorPropertyNames<T> = { [K in keyof T]: T[K] extends new (...args: any[]) => any ? K : never }[keyof T] &
        string;

    interface DoneCallback {
        (...args: any[]): any;
        fail(error?: string | { message: string }): any;
    }

    type ProvidesCallback = (cb: DoneCallback) => any;

    type Lifecycle = (fn: ProvidesCallback, timeout?: number) => any;

    interface FunctionLike {
        readonly name: string;
    }

    interface Each {
        // Exclusively arrays.
        <T extends any[] | [any]>(cases: ReadonlyArray<T>): (name: string, fn: (...args: T) => any, timeout?: number) => void;
        <T extends ReadonlyArray<any>>(cases: ReadonlyArray<T>): (name: string, fn: (...args: ExtractEachCallbackArgs<T>) => any, timeout?: number) => void;
        // Not arrays.
        <T>(cases: ReadonlyArray<T>): (name: string, fn: (...args: T[]) => any, timeout?: number) => void;
        (cases: ReadonlyArray<ReadonlyArray<any>>): (
            name: string,
            fn: (...args: any[]) => any,
            timeout?: number
        ) => void;
        (strings: TemplateStringsArray, ...placeholders: any[]): (
            name: string,
            fn: (arg: any) => any,
            timeout?: number
        ) => void;
    }

    /**
     * Creates a test closure
     */
    interface It {
        /**
         * Creates a test closure.
         *
         * @param name The name of your test
         * @param fn The function for your test
         * @param timeout The timeout for an async function test
         */
        (name: string, fn?: ProvidesCallback, timeout?: number): void;
        /**
         * Only runs this test in the current file.
         */
        only: It;
        /**
         * Skips running this test in the current file.
         */
        skip: It;
        /**
         * Sketch out which tests to write in the future.
         */
        todo: It;
        /**
         * Experimental and should be avoided.
         */
        concurrent: It;
        /**
         * Use if you keep duplicating the same test with different data. `.each` allows you to write the
         * test once and pass data in.
         *
         * `.each` is available with two APIs:
         *
         * #### 1  `test.each(table)(name, fn)`
         *
         * - `table`: Array of Arrays with the arguments that are passed into the test fn for each row.
         * - `name`: String the title of the test block.
         * - `fn`: Function the test to be ran, this is the function that will receive the parameters in each row as function arguments.
         *
         *
         * #### 2  `test.each table(name, fn)`
         *
         * - `table`: Tagged Template Literal
         * - `name`: String the title of the test, use `$variable` to inject test data into the test title from the tagged template expressions.
         * - `fn`: Function the test to be ran, this is the function that will receive the test data object..
         *
         * @example
         *
         * // API 1
         * test.each([[1, 1, 2], [1, 2, 3], [2, 1, 3]])(
         *   '.add(%i, %i)',
         *   (a, b, expected) => {
         *     expect(a + b).toBe(expected);
         *   },
         * );
         *
         * // API 2
         * test.each`
         * a    | b    | expected
         * ${1} | ${1} | ${2}
         * ${1} | ${2} | ${3}
         * ${2} | ${1} | ${3}
         * `('returns $expected when $a is added $b', ({a, b, expected}) => {
         *    expect(a + b).toBe(expected);
         * });
         *
         */
        each: Each;
    }

    interface Describe {
        // tslint:disable-next-line ban-types
        (name: number | string | Function | FunctionLike, fn: EmptyFunction): void;
        /** Only runs the tests inside this `describe` for the current file */
        only: Describe;
        /** Skips running the tests inside this `describe` for the current file */
        skip: Describe;
        each: Each;
    }

    type PrintLabel = (string: string) => string;

    type MatcherHintColor = (arg: string) => string;

    interface MatcherHintOptions {
        comment?: string;
        expectedColor?: MatcherHintColor;
        isDirectExpectCall?: boolean;
        isNot?: boolean;
        promise?: string;
        receivedColor?: MatcherHintColor;
        secondArgument?: string;
        secondArgumentColor?: MatcherHintColor;
    }

    interface ChalkFunction {
        (text: TemplateStringsArray, ...placeholders: any[]): string;
        (...text: any[]): string;
    }

    interface ChalkColorSupport {
        level: 0 | 1 | 2 | 3;
        hasBasic: boolean;
        has256: boolean;
        has16m: boolean;
    }

    type MatcherColorFn = ChalkFunction & { supportsColor: ChalkColorSupport };

    type EqualityTester = (a: any, b: any) => boolean | undefined;

    interface MatcherUtils {
        readonly isNot: boolean;
        readonly dontThrow: () => void;
        readonly promise: string;
        readonly assertionCalls: number;
        readonly expectedAssertionsNumber: number | null;
        readonly isExpectingAssertions: boolean;
        readonly suppressedErrors: any[];
        readonly expand: boolean;
        readonly testPath: string;
        readonly currentTestName: string;
        utils: {
            readonly EXPECTED_COLOR: MatcherColorFn;
            readonly RECEIVED_COLOR: MatcherColorFn;
            readonly INVERTED_COLOR: MatcherColorFn;
            readonly BOLD_WEIGHT: MatcherColorFn;
            readonly DIM_COLOR: MatcherColorFn;
            readonly SUGGEST_TO_CONTAIN_EQUAL: string;
            diff(a: any, b: any, options?: import("jest-diff").DiffOptions): string | null;
            ensureActualIsNumber(actual: any, matcherName: string, options?: MatcherHintOptions): void;
            ensureExpectedIsNumber(actual: any, matcherName: string, options?: MatcherHintOptions): void;
            ensureNoExpected(actual: any, matcherName: string, options?: MatcherHintOptions): void;
            ensureNumbers(actual: any, expected: any, matcherName: string, options?: MatcherHintOptions): void;
            ensureExpectedIsNonNegativeInteger(expected: any, matcherName: string, options?: MatcherHintOptions): void;
            matcherHint(
                matcherName: string,
                received?: string,
                expected?: string,
                options?: MatcherHintOptions
            ): string;
            matcherErrorMessage(
              hint: string,
              generic: string,
              specific: string
            ): string;
            pluralize(word: string, count: number): string;
            printReceived(object: any): string;
            printExpected(value: any): string;
            printWithType(name: string, value: any, print: (value: any) => string): string;
            stringify(object: {}, maxDepth?: number): string;
            highlightTrailingWhitespace(text: string): string;

            printDiffOrStringify(expected: any, received: any, expectedLabel: string, receivedLabel: string, expand: boolean): string;

            getLabelPrinter(...strings: string[]): PrintLabel;

            iterableEquality: EqualityTester;
            subsetEquality: EqualityTester;
        };
        /**
         *  This is a deep-equality function that will return true if two objects have the same values (recursively).
         */
        equals(a: any, b: any, customTesters?: EqualityTester[], strictCheck?: boolean): boolean;
        [other: string]: any;
    }

    interface ExpectExtendMap {
        [key: string]: CustomMatcher;
    }

    type MatcherContext = MatcherUtils & Readonly<MatcherState>;
    type CustomMatcher = (
        this: MatcherContext,
        received: any,
        ...actual: any[]
    ) => CustomMatcherResult | Promise<CustomMatcherResult>;

    interface CustomMatcherResult {
        pass: boolean;
        message: () => string;
    }

    type SnapshotSerializerPlugin = import('pretty-format').Plugin;

    interface InverseAsymmetricMatchers {
        /**
         * `expect.not.arrayContaining(array)` matches a received array which
         * does not contain all of the elements in the expected array. That is,
         * the expected array is not a subset of the received array. It is the
         * inverse of `expect.arrayContaining`.
         *
         * Optionally, you can provide a type for the elements via a generic.
         */
        arrayContaining<E = any>(arr: E[]): any;
        /**
         * `expect.not.objectContaining(object)` matches any received object
         * that does not recursively match the expected properties. That is, the
         * expected object is not a subset of the received object. Therefore,
         * it matches a received object which contains properties that are not
         * in the expected object. It is the inverse of `expect.objectContaining`.
         *
         * Optionally, you can provide a type for the object via a generic.
         * This ensures that the object contains the desired structure.
         */
        objectContaining<E = {}>(obj: E): any;
        /**
         * `expect.not.stringMatching(string | regexp)` matches the received
         * string that does not match the expected regexp. It is the inverse of
         * `expect.stringMatching`.
         */
        stringMatching(str: string | RegExp): any;
        /**
         * `expect.not.stringContaining(string)` matches the received string
         * that does not contain the exact expected string. It is the inverse of
         * `expect.stringContaining`.
         */
        stringContaining(str: string): any;
    }
    interface MatcherState {
        assertionCalls: number;
        currentTestName: string;
        expand: boolean;
        expectedAssertionsNumber: number;
        isExpectingAssertions?: boolean;
        suppressedErrors: Error[];
        testPath: string;
    }
    /**
     * The `expect` function is used every time you want to test a value.
     * You will rarely call `expect` by itself.
     */
    interface Expect {
        /**
         * The `expect` function is used every time you want to test a value.
         * You will rarely call `expect` by itself.
         *
         * @param actual The value to apply matchers against.
         */
        <T = any>(actual: T): JestMatchers<T>;
        /**
         * Matches anything but null or undefined. You can use it inside `toEqual` or `toBeCalledWith` instead
         * of a literal value. For example, if you want to check that a mock function is called with a
         * non-null argument:
         *
         * @example
         *
         * test('map calls its argument with a non-null argument', () => {
         *   const mock = jest.fn();
         *   [1].map(x => mock(x));
         *   expect(mock).toBeCalledWith(expect.anything());
         * });
         *
         */
        anything(): any;
        /**
         * Matches anything that was created with the given constructor.
         * You can use it inside `toEqual` or `toBeCalledWith` instead of a literal value.
         *
         * @example
         *
         * function randocall(fn) {
         *   return fn(Math.floor(Math.random() * 6 + 1));
         * }
         *
         * test('randocall calls its callback with a number', () => {
         *   const mock = jest.fn();
         *   randocall(mock);
         *   expect(mock).toBeCalledWith(expect.any(Number));
         * });
         */
        any(classType: any): any;
        /**
         * Matches any array made up entirely of elements in the provided array.
         * You can use it inside `toEqual` or `toBeCalledWith` instead of a literal value.
         *
         * Optionally, you can provide a type for the elements via a generic.
         */
        arrayContaining<E = any>(arr: E[]): any;
        /**
         * Verifies that a certain number of assertions are called during a test.
         * This is often useful when testing asynchronous code, in order to
         * make sure that assertions in a callback actually got called.
         */
        assertions(num: number): void;
        /**
         * Verifies that at least one assertion is called during a test.
         * This is often useful when testing asynchronous code, in order to
         * make sure that assertions in a callback actually got called.
         */
        hasAssertions(): void;
        /**
         * You can use `expect.extend` to add your own matchers to Jest.
         */
        extend(obj: ExpectExtendMap): void;
        /**
         * Adds a module to format application-specific data structures for serialization.
         */
        addSnapshotSerializer(serializer: SnapshotSerializerPlugin): void;
        /**
         * Matches any object that recursively matches the provided keys.
         * This is often handy in conjunction with other asymmetric matchers.
         *
         * Optionally, you can provide a type for the object via a generic.
         * This ensures that the object contains the desired structure.
         */
        objectContaining<E = {}>(obj: E): any;
        /**
         * Matches any string that contains the exact provided string
         */
        stringMatching(str: string | RegExp): any;
        /**
         * Matches any received string that contains the exact expected string
         */
        stringContaining(str: string): any;

        not: InverseAsymmetricMatchers;

        setState(state: object): void;
        getState(): MatcherState & Record<string, any>;
    }

    type JestMatchers<T> = JestMatchersShape<Matchers<void, T>, Matchers<Promise<void>, T>>;

    type JestMatchersShape<TNonPromise extends {} = {}, TPromise extends {} = {}> = {
        /**
         * Use resolves to unwrap the value of a fulfilled promise so any other
         * matcher can be chained. If the promise is rejected the assertion fails.
         */
        resolves: AndNot<TPromise>,
        /**
         * Unwraps the reason of a rejected promise so any other matcher can be chained.
         * If the promise is fulfilled the assertion fails.
         */
        rejects: AndNot<TPromise>
    } & AndNot<TNonPromise>;
    type AndNot<T> = T & {
        not: T
    };
    // should be R extends void|Promise<void> but getting dtslint error
    interface Matchers<R, T = {}> {
        /**
         * Ensures the last call to a mock function was provided specific args.
         *
         * Optionally, you can provide a type for the expected arguments via a generic.
         * Note that the type must be either an array or a tuple.
         */
        lastCalledWith<E extends any[]>(...args: E): R;
        /**
         * Ensure that the last call to a mock function has returned a specified value.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        lastReturnedWith<E = any>(value: E): R;
        /**
         * Ensure that a mock function is called with specific arguments on an Nth call.
         *
         * Optionally, you can provide a type for the expected arguments via a generic.
         * Note that the type must be either an array or a tuple.
         */
        nthCalledWith<E extends any[]>(nthCall: number, ...params: E): R;
        /**
         * Ensure that the nth call to a mock function has returned a specified value.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        nthReturnedWith<E = any>(n: number, value: E): R;
        /**
         * Checks that a value is what you expect. It uses `Object.is` to check strict equality.
         * Don't use `toBe` with floating-point numbers.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        toBe<E = any>(expected: E): R;
        /**
         * Ensures that a mock function is called.
         */
        toBeCalled(): R;
        /**
         * Ensures that a mock function is called an exact number of times.
         */
        toBeCalledTimes(expected: number): R;
        /**
         * Ensure that a mock function is called with specific arguments.
         *
         * Optionally, you can provide a type for the expected arguments via a generic.
         * Note that the type must be either an array or a tuple.
         */
        toBeCalledWith<E extends any[]>(...args: E): R;
        /**
         * Using exact equality with floating point numbers is a bad idea.
         * Rounding means that intuitive things fail.
         * The default for numDigits is 2.
         */
        toBeCloseTo(expected: number, numDigits?: number): R;
        /**
         * Ensure that a variable is not undefined.
         */
        toBeDefined(): R;
        /**
         * When you don't care what a value is, you just want to
         * ensure a value is false in a boolean context.
         */
        toBeFalsy(): R;
        /**
         * For comparing floating point numbers.
         */
        toBeGreaterThan(expected: number): R;
        /**
         * For comparing floating point numbers.
         */
        toBeGreaterThanOrEqual(expected: number): R;
        /**
         * Ensure that an object is an instance of a class.
         * This matcher uses `instanceof` underneath.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        toBeInstanceOf<E = any>(expected: E): R;
        /**
         * For comparing floating point numbers.
         */
        toBeLessThan(expected: number): R;
        /**
         * For comparing floating point numbers.
         */
        toBeLessThanOrEqual(expected: number): R;
        /**
         * This is the same as `.toBe(null)` but the error messages are a bit nicer.
         * So use `.toBeNull()` when you want to check that something is null.
         */
        toBeNull(): R;
        /**
         * Use when you don't care what a value is, you just want to ensure a value
         * is true in a boolean context. In JavaScript, there are six falsy values:
         * `false`, `0`, `''`, `null`, `undefined`, and `NaN`. Everything else is truthy.
         */
        toBeTruthy(): R;
        /**
         * Used to check that a variable is undefined.
         */
        toBeUndefined(): R;
        /**
         * Used to check that a variable is NaN.
         */
        toBeNaN(): R;
        /**
         * Used when you want to check that an item is in a list.
         * For testing the items in the list, this uses `===`, a strict equality check.
         * It can also check whether a string is a substring of another string.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        toContain<E = any>(expected: E): R;
        /**
         * Used when you want to check that an item is in a list.
         * For testing the items in the list, this matcher recursively checks the
         * equality of all fields, rather than checking for object identity.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        toContainEqual<E = any>(expected: E): R;
        /**
         * Used when you want to check that two objects have the same value.
         * This matcher recursively checks the equality of all fields, rather than checking for object identity.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        toEqual<E = any>(expected: E): R;
        /**
         * Ensures that a mock function is called.
         */
        toHaveBeenCalled(): R;
        /**
         * Ensures that a mock function is called an exact number of times.
         */
        toHaveBeenCalledTimes(expected: number): R;
        /**
         * Ensure that a mock function is called with specific arguments.
         *
         * Optionally, you can provide a type for the expected arguments via a generic.
         * Note that the type must be either an array or a tuple.
         */
        toHaveBeenCalledWith<E extends any[]>(...params: E): R;
        /**
         * Ensure that a mock function is called with specific arguments on an Nth call.
         *
         * Optionally, you can provide a type for the expected arguments via a generic.
         * Note that the type must be either an array or a tuple.
         */
        toHaveBeenNthCalledWith<E extends any[]>(nthCall: number, ...params: E): R;
        /**
         * If you have a mock function, you can use `.toHaveBeenLastCalledWith`
         * to test what arguments it was last called with.
         *
         * Optionally, you can provide a type for the expected arguments via a generic.
         * Note that the type must be either an array or a tuple.
         */
        toHaveBeenLastCalledWith<E extends any[]>(...params: E): R;
        /**
         * Use to test the specific value that a mock function last returned.
         * If the last call to the mock function threw an error, then this matcher will fail
         * no matter what value you provided as the expected return value.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        toHaveLastReturnedWith<E = any>(expected: E): R;
        /**
         * Used to check that an object has a `.length` property
         * and it is set to a certain numeric value.
         */
        toHaveLength(expected: number): R;
        /**
         * Use to test the specific value that a mock function returned for the nth call.
         * If the nth call to the mock function threw an error, then this matcher will fail
         * no matter what value you provided as the expected return value.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        toHaveNthReturnedWith<E = any>(nthCall: number, expected: E): R;
        /**
         * Use to check if property at provided reference keyPath exists for an object.
         * For checking deeply nested properties in an object you may use dot notation or an array containing
         * the keyPath for deep references.
         *
         * Optionally, you can provide a value to check if it's equal to the value present at keyPath
         * on the target object. This matcher uses 'deep equality' (like `toEqual()`) and recursively checks
         * the equality of all fields.
         *
         * @example
         *
         * expect(houseForSale).toHaveProperty('kitchen.area', 20);
         */
        toHaveProperty<E = any>(propertyPath: string | any[], value?: E): R;
        /**
         * Use to test that the mock function successfully returned (i.e., did not throw an error) at least one time
         */
        toHaveReturned(): R;
        /**
         * Use to ensure that a mock function returned successfully (i.e., did not throw an error) an exact number of times.
         * Any calls to the mock function that throw an error are not counted toward the number of times the function returned.
         */
        toHaveReturnedTimes(expected: number): R;
        /**
         * Use to ensure that a mock function returned a specific value.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        toHaveReturnedWith<E = any>(expected: E): R;
        /**
         * Check that a string matches a regular expression.
         */
        toMatch(expected: string | RegExp): R;
        /**
         * Used to check that a JavaScript object matches a subset of the properties of an object
         *
         * Optionally, you can provide an object to use as Generic type for the expected value.
         * This ensures that the matching object matches the structure of the provided object-like type.
         *
         * @example
         *
         * type House = {
         *   bath: boolean;
         *   bedrooms: number;
         *   kitchen: {
         *     amenities: string[];
         *     area: number;
         *     wallColor: string;
         *   }
         * };
         *
         * expect(desiredHouse).toMatchObject<House>(...standardHouse, kitchen: {area: 20}) // wherein standardHouse is some base object of type House
         */
        toMatchObject<E extends {} | any[]>(expected: E): R;
        /**
         * This ensures that a value matches the most recent snapshot with property matchers.
         * Check out [the Snapshot Testing guide](http://facebook.github.io/jest/docs/snapshot-testing.html) for more information.
         */
        toMatchSnapshot<U extends { [P in keyof T]: any }>(propertyMatchers: Partial<U>, snapshotName?: string): R;
        /**
         * This ensures that a value matches the most recent snapshot.
         * Check out [the Snapshot Testing guide](http://facebook.github.io/jest/docs/snapshot-testing.html) for more information.
         */
        toMatchSnapshot(snapshotName?: string): R;
        /**
         * This ensures that a value matches the most recent snapshot with property matchers.
         * Instead of writing the snapshot value to a .snap file, it will be written into the source code automatically.
         * Check out [the Snapshot Testing guide](http://facebook.github.io/jest/docs/snapshot-testing.html) for more information.
         */
        toMatchInlineSnapshot<U extends { [P in keyof T]: any }>(propertyMatchers: Partial<U>, snapshot?: string): R;
        /**
         * This ensures that a value matches the most recent snapshot with property matchers.
         * Instead of writing the snapshot value to a .snap file, it will be written into the source code automatically.
         * Check out [the Snapshot Testing guide](http://facebook.github.io/jest/docs/snapshot-testing.html) for more information.
         */
        toMatchInlineSnapshot(snapshot?: string): R;
        /**
         * Ensure that a mock function has returned (as opposed to thrown) at least once.
         */
        toReturn(): R;
        /**
         * Ensure that a mock function has returned (as opposed to thrown) a specified number of times.
         */
        toReturnTimes(count: number): R;
        /**
         * Ensure that a mock function has returned a specified value at least once.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        toReturnWith<E = any>(value: E): R;
        /**
         * Use to test that objects have the same types as well as structure.
         *
         * Optionally, you can provide a type for the expected value via a generic.
         * This is particuarly useful for ensuring expected objects have the right structure.
         */
        toStrictEqual<E = any>(expected: E): R;
        /**
         * Used to test that a function throws when it is called.
         */
        toThrow(error?: string | Constructable | RegExp | Error): R;
        /**
         * If you want to test that a specific error is thrown inside a function.
         */
        toThrowError(error?: string | Constructable | RegExp | Error): R;
        /**
         * Used to test that a function throws a error matching the most recent snapshot when it is called.
         */
        toThrowErrorMatchingSnapshot(): R;
        /**
         * Used to test that a function throws a error matching the most recent snapshot when it is called.
         * Instead of writing the snapshot value to a .snap file, it will be written into the source code automatically.
         */
        toThrowErrorMatchingInlineSnapshot(snapshot?: string): R;
    }

    type RemoveFirstFromTuple<T extends any[]> =
    T['length'] extends 0 ? [] :
        (((...b: T) => void) extends (a: any, ...b: infer I) => void ? I : []);

    type Parameters<T extends (...args: any[]) => any> = T extends (...args: infer P) => any ? P : never;

    interface AsymmetricMatcher {
        asymmetricMatch(other: unknown): boolean;
    }
    type NonAsyncMatchers<TMatchers extends ExpectExtendMap> = {
        [K in keyof TMatchers]: ReturnType<TMatchers[K]> extends Promise<CustomMatcherResult>? never: K
    }[keyof TMatchers];
    type CustomAsyncMatchers<TMatchers extends ExpectExtendMap> = {[K in NonAsyncMatchers<TMatchers>]: CustomAsymmetricMatcher<TMatchers[K]>};
    type CustomAsymmetricMatcher<TMatcher extends (...args: any[]) => any> = (...args: RemoveFirstFromTuple<Parameters<TMatcher>>) => AsymmetricMatcher;

    // should be TMatcherReturn extends void|Promise<void> but getting dtslint error
    type CustomJestMatcher<TMatcher extends (...args: any[]) => any, TMatcherReturn> = (...args: RemoveFirstFromTuple<Parameters<TMatcher>>) => TMatcherReturn;

    type ExpectProperties= {
        [K in keyof Expect]: Expect[K]
    };
    // should be TMatcherReturn extends void|Promise<void> but getting dtslint error
    // Use the `void` type for return types only. Otherwise, use `undefined`. See: https://github.com/Microsoft/dtslint/blob/master/docs/void-return.md
    // have added issue https://github.com/microsoft/dtslint/issues/256 - Cannot have type union containing void ( to be used as return type only
    type ExtendedMatchers<TMatchers extends ExpectExtendMap, TMatcherReturn, TActual> = Matchers<TMatcherReturn, TActual> & {[K in keyof TMatchers]: CustomJestMatcher<TMatchers[K], TMatcherReturn>};
    type JestExtendedMatchers<TMatchers extends ExpectExtendMap, TActual> = JestMatchersShape<ExtendedMatchers<TMatchers, void, TActual>, ExtendedMatchers<TMatchers, Promise<void>, TActual>>;

    // when have called expect.extend
    type ExtendedExpectFunction<TMatchers extends ExpectExtendMap> = <TActual>(actual: TActual) => JestExtendedMatchers<TMatchers, TActual>;

    type ExtendedExpect<TMatchers extends ExpectExtendMap>=
    ExpectProperties &
    AndNot<CustomAsyncMatchers<TMatchers>> &
    ExtendedExpectFunction<TMatchers>;
    /**
     * Construct a type with the properties of T except for those in type K.
     */
    type Omit<T, K extends keyof any> = Pick<T, Exclude<keyof T, K>>;
    type NonPromiseMatchers<T extends JestMatchersShape> = Omit<T, 'resolves' | 'rejects' | 'not'>;
    type PromiseMatchers<T extends JestMatchersShape> = Omit<T['resolves'], 'not'>;

    interface Constructable {
        new (...args: any[]): any;
    }

    interface Mock<T = any, Y extends any[] = any> extends Function, MockInstance<T, Y> {
        new (...args: Y): T;
        (...args: Y): T;
    }

    interface SpyInstance<T = any, Y extends any[] = any> extends MockInstance<T, Y> {}

    /**
     * Represents a function that has been spied on.
     */
    type SpiedFunction<T extends (...args: any[]) => any> = SpyInstance<ReturnType<T>, ArgsType<T>>;

    /**
     * Wrap a function with mock definitions
     *
     * @example
     *
     *  import { myFunction } from "./library";
     *  jest.mock("./library");
     *
     *  const mockMyFunction = myFunction as jest.MockedFunction<typeof myFunction>;
     *  expect(mockMyFunction.mock.calls[0][0]).toBe(42);
     */
    type MockedFunction<T extends (...args: any[]) => any> = MockInstance<ReturnType<T>, ArgsType<T>> & T;

    /**
     * Wrap a class with mock definitions
     *
     * @example
     *
     *  import { MyClass } from "./libary";
     *  jest.mock("./library");
     *
     *  const mockedMyClass = MyClass as jest.MockedClass<MyClass>;
     *
     *  expect(mockedMyClass.mock.calls[0][0]).toBe(42); // Constructor calls
     *  expect(mockedMyClass.prototype.myMethod.mock.calls[0][0]).toBe(42); // Method calls
     */

    type MockedClass<T extends Constructable> = MockInstance<
        InstanceType<T>,
        T extends new (...args: infer P) => any ? P : never
    > & {
        prototype: T extends { prototype: any } ? Mocked<T['prototype']> : never;
    } & T;

    /**
     * Wrap an object or a module with mock definitions
     *
     * @example
     *
     *  jest.mock("../api");
     *  import * as api from "../api";
     *
     *  const mockApi = api as jest.Mocked<typeof api>;
     *  api.MyApi.prototype.myApiMethod.mockImplementation(() => "test");
     */
    type Mocked<T> = {
        [P in keyof T]: T[P] extends (...args: any[]) => any
            ? MockInstance<ReturnType<T[P]>, ArgsType<T[P]>>
            : T[P] extends Constructable
            ? MockedClass<T[P]>
            : T[P]
    } &
        T;

    interface MockInstance<T, Y extends any[]> {
        /** Returns the mock name string set by calling `mockFn.mockName(value)`. */
        getMockName(): string;
        /** Provides access to the mock's metadata */
        mock: MockContext<T, Y>;
        /**
         * Resets all information stored in the mockFn.mock.calls and mockFn.mock.instances arrays.
         *
         * Often this is useful when you want to clean up a mock's usage data between two assertions.
         *
         * Beware that `mockClear` will replace `mockFn.mock`, not just `mockFn.mock.calls` and `mockFn.mock.instances`.
         * You should therefore avoid assigning mockFn.mock to other variables, temporary or not, to make sure you
         * don't access stale data.
         */
        mockClear(): this;
        /**
         * Resets all information stored in the mock, including any initial implementation and mock name given.
         *
         * This is useful when you want to completely restore a mock back to its initial state.
         *
         * Beware that `mockReset` will replace `mockFn.mock`, not just `mockFn.mock.calls` and `mockFn.mock.instances`.
         * You should therefore avoid assigning mockFn.mock to other variables, temporary or not, to make sure you
         * don't access stale data.
         */
        mockReset(): this;
        /**
         * Does everything that `mockFn.mockReset()` does, and also restores the original (non-mocked) implementation.
         *
         * This is useful when you want to mock functions in certain test cases and restore the original implementation in others.
         *
         * Beware that `mockFn.mockRestore` only works when mock was created with `jest.spyOn`. Thus you have to take care of restoration
         * yourself when manually assigning `jest.fn()`.
         *
         * The [`restoreMocks`](https://jestjs.io/docs/en/configuration.html#restoremocks-boolean) configuration option is available
         * to restore mocks automatically between tests.
         */
        mockRestore(): void;
        /**
         * Returns the function that was set as the implementation of the mock (using mockImplementation).
         */
        getMockImplementation(): (...args: Y) => T | undefined;
        /**
         * Accepts a function that should be used as the implementation of the mock. The mock itself will still record
         * all calls that go into and instances that come from itself – the only difference is that the implementation
         * will also be executed when the mock is called.
         *
         * Note: `jest.fn(implementation)` is a shorthand for `jest.fn().mockImplementation(implementation)`.
         */
        mockImplementation(fn?: (...args: Y) => T): this;
        /**
         * Accepts a function that will be used as an implementation of the mock for one cal