assert.d.ts
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declare module 'assert' {
/** An alias of `assert.ok()`. */
function assert(value: any, message?: string | Error): asserts value;
namespace assert {
class AssertionError implements Error {
name: string;
message: string;
actual: any;
expected: any;
operator: string;
generatedMessage: boolean;
code: 'ERR_ASSERTION';
constructor(options?: {
/** If provided, the error message is set to this value. */
message?: string;
/** The `actual` property on the error instance. */
actual?: any;
/** The `expected` property on the error instance. */
expected?: any;
/** The `operator` property on the error instance. */
operator?: string;
/** If provided, the generated stack trace omits frames before this function. */
// tslint:disable-next-line:ban-types
stackStartFn?: Function;
});
}
class CallTracker {
calls(exact?: number): () => void;
calls<Func extends (...args: any[]) => any>(fn?: Func, exact?: number): Func;
report(): CallTrackerReportInformation[];
verify(): void;
}
interface CallTrackerReportInformation {
message: string;
/** The actual number of times the function was called. */
actual: number;
/** The number of times the function was expected to be called. */
expected: number;
/** The name of the function that is wrapped. */
operator: string;
/** A stack trace of the function. */
stack: object;
}
type AssertPredicate = RegExp | (new () => object) | ((thrown: any) => boolean) | object | Error;
function fail(message?: string | Error): never;
/** @deprecated since v10.0.0 - use fail([message]) or other assert functions instead. */
function fail(
actual: any,
expected: any,
message?: string | Error,
operator?: string,
// tslint:disable-next-line:ban-types
stackStartFn?: Function,
): never;
function ok(value: any, message?: string | Error): asserts value;
/** @deprecated since v9.9.0 - use strictEqual() instead. */
function equal(actual: any, expected: any, message?: string | Error): void;
/** @deprecated since v9.9.0 - use notStrictEqual() instead. */
function notEqual(actual: any, expected: any, message?: string | Error): void;
/** @deprecated since v9.9.0 - use deepStrictEqual() instead. */
function deepEqual(actual: any, expected: any, message?: string | Error): void;
/** @deprecated since v9.9.0 - use notDeepStrictEqual() instead. */
function notDeepEqual(actual: any, expected: any, message?: string | Error): void;
function strictEqual<T>(actual: any, expected: T, message?: string | Error): asserts actual is T;
function notStrictEqual(actual: any, expected: any, message?: string | Error): void;
function deepStrictEqual<T>(actual: any, expected: T, message?: string | Error): asserts actual is T;
function notDeepStrictEqual(actual: any, expected: any, message?: string | Error): void;
function throws(block: () => any, message?: string | Error): void;
function throws(block: () => any, error: AssertPredicate, message?: string | Error): void;
function doesNotThrow(block: () => any, message?: string | Error): void;
function doesNotThrow(block: () => any, error: AssertPredicate, message?: string | Error): void;
function ifError(value: any): asserts value is null | undefined;
function rejects(block: (() => Promise<any>) | Promise<any>, message?: string | Error): Promise<void>;
function rejects(
block: (() => Promise<any>) | Promise<any>,
error: AssertPredicate,
message?: string | Error,
): Promise<void>;
function doesNotReject(block: (() => Promise<any>) | Promise<any>, message?: string | Error): Promise<void>;
function doesNotReject(
block: (() => Promise<any>) | Promise<any>,
error: AssertPredicate,
message?: string | Error,
): Promise<void>;
function match(value: string, regExp: RegExp, message?: string | Error): void;
function doesNotMatch(value: string, regExp: RegExp, message?: string | Error): void;
const strict: Omit<
typeof assert,
| 'equal'
| 'notEqual'
| 'deepEqual'
| 'notDeepEqual'
| 'ok'
| 'strictEqual'
| 'deepStrictEqual'
| 'ifError'
| 'strict'
> & {
(value: any, message?: string | Error): asserts value;
equal: typeof strictEqual;
notEqual: typeof notStrictEqual;
deepEqual: typeof deepStrictEqual;
notDeepEqual: typeof notDeepStrictEqual;
// Mapped types and assertion functions are incompatible?
// TS2775: Assertions require every name in the call target
// to be declared with an explicit type annotation.
ok: typeof ok;
strictEqual: typeof strictEqual;
deepStrictEqual: typeof deepStrictEqual;
ifError: typeof ifError;
strict: typeof strict;
};
}
export = assert;
}