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index.d.ts
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index.d.ts
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// Type definitions for Jest 24.0
// 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>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
// TypeScript Version: 3.0
/// <reference types="jest-diff" />
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;
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(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.
*/
function requireMock(moduleName: string): any;
/**
* 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;
/**
* 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 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;
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[]>(cases: ReadonlyArray<T>): (name: string, fn: (...args: 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;
}
interface MatcherUtils {
readonly expand: boolean;
readonly isNot: boolean;
utils: {
readonly EXPECTED_COLOR: (text: string) => string;
readonly RECEIVED_COLOR: (text: string) => string;
diff: typeof import('jest-diff');
ensureActualIsNumber(actual: any, matcherName?: string): void;
ensureExpectedIsNumber(actual: any, matcherName?: string): void;
ensureNoExpected(actual: any, matcherName?: string): void;
ensureNumbers(actual: any, expected: any, matcherName?: string): void;
/**
* get the type of a value with handling of edge cases like `typeof []` and `typeof null`
*/
getType(value: any): string;
matcherHint(
matcherName: string,
received?: string,
expected?: string,
options?: { secondArgument?: string; isDirectExpectCall?: boolean }
): string;
pluralize(word: string, count: number): string;
printExpected(value: any): string;
printReceived(value: any): string;
printWithType(name: string, received: any, print: (value: any) => string): string;
stringify(object: {}, maxDepth?: number): string;
};
/**
* This is a deep-equality function that will return true if two objects have the same values (recursively).
*/
equals(a: any, b: any): boolean;
}
interface ExpectExtendMap {
[key: string]: CustomMatcher;
}
type CustomMatcher = (
this: MatcherUtils,
received: any,
...actual: any[]
) => CustomMatcherResult | Promise<CustomMatcherResult>;
interface CustomMatcherResult {
pass: boolean;
message: string | (() => string);
}
interface SnapshotSerializerOptions {
callToJSON?: boolean;
edgeSpacing?: string;
spacing?: string;
escapeRegex?: boolean;
highlight?: boolean;
indent?: number;
maxDepth?: number;
min?: boolean;
plugins?: SnapshotSerializerPlugin[];
printFunctionName?: boolean;
theme?: SnapshotSerializerOptionsTheme;
// see https://github.com/facebook/jest/blob/e56103cf142d2e87542ddfb6bd892bcee262c0e6/types/PrettyFormat.js
}
interface SnapshotSerializerOptionsTheme {
comment?: string;
content?: string;
prop?: string;
tag?: string;
value?: string;
}
interface SnapshotSerializerColor {
close: string;
open: string;
}
interface SnapshotSerializerColors {
comment: SnapshotSerializerColor;
content: SnapshotSerializerColor;
prop: SnapshotSerializerColor;
tag: SnapshotSerializerColor;
value: SnapshotSerializerColor;
}
interface SnapshotSerializerPlugin {
print(
val: any,
serialize: (val: any) => string,
indent: (str: string) => string,
opts: SnapshotSerializerOptions,
colors: SnapshotSerializerColors
): string;
test(val: any): boolean;
}
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`.
*/
arrayContaining(arr: any[]): 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`.
*/
objectContaining(obj: {}): 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;
}
/**
* 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): Matchers<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.
*/
arrayContaining(arr: any[]): 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.
*/
objectContaining(obj: {}): 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;
}
interface Matchers<R> {
/**
* Ensures the last call to a mock function was provided specific args.
*/
lastCalledWith(...args: any[]): R;
/**
* Ensure that the last call to a mock function has returned a specified value.
*/
lastReturnedWith(value: any): R;
/**
* If you know how to test something, `.not` lets you test its opposite.
*/
not: Matchers<R>;
/**
* Ensure that a mock function is called with specific arguments on an Nth call.
*/
nthCalledWith(nthCall: number, ...params: any[]): R;
/**
* Ensure that the nth call to a mock function has returned a specified value.
*/
nthReturnedWith(n: number, value: any): R;
/**
* 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: Matchers<Promise<R>>;
/**
* Unwraps the reason of a rejected promise so any other matcher can be chained.
* If the promise is fulfilled the assertion fails.
*/
rejects: Matchers<Promise<R>>;
/**
* Checks that a value is what you expect. It uses `===` to check strict equality.
* Don't use `toBe` with floating-point numbers.
*/
toBe(expected: any): 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.
*/
toBeCalledWith(...args: any[]): 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.
*/
toBeInstanceOf(expected: any): 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.
*/
toContain(expected: any): 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.
*/
toContainEqual(expected: any): 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.
*/
toEqual(expected: any): 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.
*/
toHaveBeenCalledWith(...params: any[]): R;
/**
* Ensure that a mock function is called with specific arguments on an Nth call.
*/
toHaveBeenNthCalledWith(nthCall: number, ...params: any[]): R;
/**
* If you have a mock function, you can use `.toHaveBeenLastCalledWith`
* to test what arguments it was last called with.
*/
toHaveBeenLastCalledWith(...params: any[]): 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.
*/
toHaveLastReturnedWith(expected: any): 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.
*/
toHaveNthReturnedWith(nthCall: number, expected: any): 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(propertyPath: string | any[], value?: any): 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.
*/
toHaveReturnedWith(expected: any): 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<T extends { [P in keyof R]: any }>(propertyMatchers: Partial<T>, 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<T extends { [P in keyof R]: any }>(propertyMatchers: Partial<T>, 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.
*/
toReturnWith(value: any): R;
/**
* Use to test that objects have the same types as well as structure.
*/
toStrictEqual(expected: {}): 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;
}
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> {}
/**
* 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(): void;
/**
* 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(): void;
/**
* 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;
/**
* 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 call to the mocked function.
* Can be chained so that multiple function calls produce different results.
*
* @example
*
* const myMockFn = jest
* .fn()
* .mockImplementationOnce(cb => cb(null, true))
* .mockImplementationOnce(cb => cb(null, false));
*
* myMockFn((err, val) => console.log(val)); // true
*
* myMockFn((err, val) => console.log(val)); // false
*/
mockImplementationOnce(fn: (...args: Y) => T): this;
/** Sets the name of the mock`. */
mockName(name: string): this;
/**