interface Describe {
    /**
     * Defines a group of tests.
     *
     * @param name - The name of the group.
     * @param callback - The function to create a scope for a group of tests.
     */
    (name: string, callback: () => void | Promise<void>): void;
    /**
     * Marks a group of tests as focused.
     *
     * @param name - The name of the group.
     * @param callback - The function to create a scope for a group of tests.
     */
    only: (name: string, callback: () => void | Promise<void>) => void;
    /**
     * Marks a group of tests as skipped.
     *
     * @param name - The name of the group.
     * @param callback - The function to create a scope for a group of tests.
     */
    skip: (name: string, callback: () => void | Promise<void>) => void;
    /**
     * Marks a group of tests as yet to be implemented.
     *
     * @param name - The name of the group.
     * @param callback - The function to create a scope for a group of tests.
     */
    todo: (name: string, callback?: () => void | Promise<void>) => void;
}

interface Matchers {
    /**
     * Checks if the type is the same as the given type.
     */
    toBe: {
        /**
         * Checks if the type is the same as the given type.
         */
        <T>(): void;
        /**
         * Checks if the type is the same as type of the given expression.
         */
        (target: unknown): void;
    };
    /**
     * Checks if the type is assignable from the given type.
     */
    toBeAssignableFrom: {
        /**
         * Checks if the type is assignable from the given type.
         */
        <T>(): void;
        /**
         * Checks if the type is assignable from type of the given expression.
         */
        (target: unknown): void;
    };
    /**
     * Checks if the type is assignable to the given type.
     */
    toBeAssignableTo: {
        /**
         * Checks if the type is assignable to the given type.
         */
        <T>(): void;
        /**
         * Checks if the type is assignable to type of the given expression.
         */
        (target: unknown): void;
    };
}
interface Matchers {
    /**
     * Checks if the JSX component accepts the given props.
     */
    toAcceptProps: (props: Record<string, unknown>) => void;
    /**
     * Checks if the decorator is applicable to the given class or class member.
     */
    toBeApplicable: (target: unknown, context: DecoratorContext) => void;
    /**
     * Checks if the function is callable with the given arguments.
     */
    toBeCallableWith: (...args: Array<unknown>) => void;
    /**
     * Checks if the class is constructable with the given arguments.
     */
    toBeConstructableWith: (...args: Array<unknown>) => void;
    /**
     * Checks if the generic is instantiable with the given type arguments.
     */
    toBeInstantiableWith: <T extends [...args: Array<unknown>]>() => void;
    /**
     * Checks if the type has the given property.
     */
    toHaveProperty: (key: string | number | symbol) => void;
}
interface Matchers {
    /**
     * Checks if the type raises an error.
     *
     * @deprecated This API is planned to be removed. For a replacement, see https://tstyche.org/guides/expect-errors.
     */
    toRaiseError: (...target: Array<string | number | RegExp>) => void;
}
interface Modifier {
    /**
     * Indicates a type-level assertion.
     */
    type: Matchers & {
        /**
         * Negates the assertion.
         */
        not: Matchers;
    };
}
interface Expect {
    /**
     * Builds an assertion.
     */
    <S>(): Modifier;
    /**
     * Builds an assertion.
     */
    (source: unknown): Modifier;
    /**
     * Marks an assertion as focused.
     */
    only: {
        /**
         * Marks an assertion as focused.
         */
        <S>(): Modifier;
        /**
         * Marks an assertion as focused.
         */
        (source: unknown): Modifier;
    };
    /**
     * Marks an assertion as skipped.
     */
    skip: {
        /**
         * Marks an assertion as skipped.
         */
        <S>(): Modifier;
        /**
         * Marks an assertion as skipped.
         */
        (source: unknown): Modifier;
    };
}

interface Test {
    /**
     * Defines a single test.
     *
     * @param name - The name of the test.
     * @param callback - The function with a code snippet and assertions.
     */
    (name: string, callback: () => void | Promise<void>): void;
    /**
     * Marks a test as focused.
     *
     * @param name - The name of the test.
     * @param callback - The function with a code snippet and assertions.
     */
    only: (name: string, callback: () => void | Promise<void>) => void;
    /**
     * Marks a test as skipped.
     *
     * @param name - The name of the test.
     * @param callback - The function with a code snippet and assertions.
     */
    skip: (name: string, callback: () => void | Promise<void>) => void;
    /**
     * Marks a test as yet to be implemented.
     *
     * @param name - The name of the test.
     * @param callback - The function with a code snippet and assertions.
     */
    todo: (name: string, callback?: () => void | Promise<void>) => void;
}

/**
 * The fill-in type. Useful to fill in the required type arguments of generic types.
 */
type _ = never;
/**
 * Builds an assertion.
 */
declare const expect: Expect;
/**
 * Reshapes type of the given object by removing the specified keys.
 */
declare function omit<T, K extends PropertyKey>(object: T, ...keys: [K, ...Array<K>]): Omit<T, K>;
/**
 * Reshapes type of the given object by keeping only the specified keys.
 */
declare function pick<T, K extends keyof T>(object: T, ...keys: [K, ...Array<K>]): Pick<T, K>;
/**
 * Defines a test group.
 */
declare const describe: Describe;
/**
 * Defines a single test.
 */
declare const it: Test;
/**
 * Defines a single test.
 */
declare const test: Test;

export { describe, expect, it, omit, pick, test };
export type { _ };