enzyme.d.ts

// Type definitions for Enzyme v1.2.0
// Project: https://github.com/airbnb/enzyme
// Definitions by: Marian Palkus <https://github.com/MarianPalkus>, Cap3 <http://www.cap3.de>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped

///<reference path="../react/react.d.ts" />

declare module "enzyme" {

    import {ReactElement, Component} from "react";

    export class ElementClass extends Component<any, any> {
    }

    /**
     * Many methods in Enzyme's API accept a selector as an argument. Selectors in Enzyme can fall into one of the
     * following three categories:
     *
     *  1. A Valid CSS Selector
     *  2. A React Component Constructor
     *  3. A React Component's displayName
     */
    export type EnzymeSelector = String | typeof ElementClass;

    interface CommonWrapper<T, P, S> {
        /**
         * Find every node in the render tree that matches the provided selector.
         * @param selector The selector to match.
         */
        find(selector: EnzymeSelector): T;

        /**
         * Finds every node in the render tree that returns true for the provided predicate function.
         * @param predicate
         */
        findWhere(predicate: (shallowWrapper: ShallowWrapper<P, S>) => Boolean): T;

        /**
         * Removes nodes in the current wrapper that do not match the provided selector.
         * @param selector The selector to match.
         */
        filter(selector: EnzymeSelector): T;

        /**
         * Returns a new wrapper with only the nodes of the current wrapper that, when passed into the provided predicate function, return true.
         * @param predicate
         */
        filterWhere(predicate: (shallowWrapper: ShallowWrapper<P, S>) => Boolean): T;

        /**
         * Returns whether or not the current wrapper has a node anywhere in it's render tree that looks like the one passed in.
         * @param node
         */
        contains(node: ReactElement<any>): Boolean;

        /**
         * Returns whether or not the current node has a className prop including the passed in class name.
         * @param className
         */
        hasClass(className: String): Boolean;

        /**
         * Returns whether or not the current node matches a provided selector.
         * @param selector
         */
        is(selector: EnzymeSelector): Boolean;

        /**
         * Returns a new wrapper with only the nodes of the current wrapper that don't match the provided selector.
         * This method is effectively the negation or inverse of filter.
         * @param selector
         */
        not(selector: EnzymeSelector): T;

        /**
         * Returns a new wrapper with all of the children of the node(s) in the current wrapper. Optionally, a selector
         * can be provided and it will filter the children by this selector.
         * @param [selector]
         */
        children(selector?: EnzymeSelector): T;

        /**
         * Returns a wrapper around all of the parents/ancestors of the wrapper. Does not include the node in the
         * current wrapper. Optionally, a selector can be provided and it will filter the parents by this selector.
         *
         * Note: can only be called on a wrapper of a single node.
         * @param [selector]
         */
        parents(selector?: EnzymeSelector): T;

        /**
         * Returns a wrapper with the direct parent of the node in the current wrapper.
         */
        parent(): T;

        /**
         * Returns a wrapper of the first element that matches the selector by traversing up through the current node's
         * ancestors in the tree, starting with itself.
         *
         * Note: can only be called on a wrapper of a single node.
         * @param selector
         */
        closest(selector: EnzymeSelector): T;

        /**
         * Returns a string of the rendered text of the current render tree. This function should be looked at with
         * skepticism if being used to test what the actual HTML output of the component will be. If that is what you
         * would like to test, use enzyme's render function instead.
         *
         * Note: can only be called on a wrapper of a single node.
         */
        text(): String;

        /**
         * Returns a string of the rendered HTML markup of the current render tree.
         *
         * Note: can only be called on a wrapper of a single node.
         */
        html(): String;

        /**
         * Returns the node at a given index of the current wrapper.
         * @param index
         */
        get(index: number): ReactElement<any>;

        /**
         * Returns a wrapper around the node at a given index of the current wrapper.
         * @param index
         */
        at(index: number): T;

        /**
         * Reduce the set of matched nodes to the first in the set.
         */
        first(): T;

        /**
         * Reduce the set of matched nodes to the last in the set.
         */
        last(): T;

        /**
         * Returns the state hash for the root node of the wrapper. Optionally pass in a prop name and it will return just that value.
         * @param [key]
         */
        state(key?: String): any;

        /**
         * Returns the props hash for the current node of the wrapper.
         *
         * NOTE: can only be called on a wrapper of a single node.
         */
        props(): Object;

        /**
         * Returns the prop value for the node of the current wrapper with the provided key.
         *
         * NOTE: can only be called on a wrapper of a single node.
         * @param key
         */
        prop(key: String): any;

        /**
         * Simulate events.
         * Returns itself.
         * @param event
         * @param args?
         */
        simulate(event: String, ...args: any[]): T;

        /**
         * A method to invoke setState() on the root component instance similar to how you might in the definition of
         * the component, and re-renders. This method is useful for testing your component in hard to achieve states,
         * however should be used sparingly. If possible, you should utilize your component's external API in order to
         * get it into whatever state you want to test, in order to be as accurate of a test as possible. This is not
         * always practical, however.
         * Returns itself.
         *
         * NOTE: can only be called on a wrapper instance that is also the root instance.
         * @param state
         */
        setState(state: S): T;

        /**
         * A method that sets the props of the root component, and re-renders. Useful for when you are wanting to test
         * how the component behaves over time with changing props. Calling this, for instance, will call the
         * componentWillReceiveProps lifecycle method.
         *
         * Similar to setState, this method accepts a props object and will merge it in with the already existing props.
         * Returns itself.
         *
         * NOTE: can only be called on a wrapper instance that is also the root instance.
         * @param state
         */
        setProps(state: Object): T;

        /**
         * A method that sets the context of the root component, and re-renders. Useful for when you are wanting to
         * test how the component behaves over time with changing contexts.
         * Returns itself.
         *
         * NOTE: can only be called on a wrapper instance that is also the root instance.
         * @param state
         */
        setContext(state: Object): T;

        /**
         * Gets the instance of the component being rendered as the root node passed into shallow().
         *
         * NOTE: can only be called on a wrapper instance that is also the root instance.
         */
        instance(): Component<P, S>;

        /**
         * Forces a re-render. Useful to run before checking the render output if something external may be updating
         * the state of the component somewhere.
         * Returns itself.
         *
         * NOTE: can only be called on a wrapper instance that is also the root instance.
         */
        update(): T;

        /**
         * Returns an html-like string of the wrapper for debugging purposes. Useful to print out to the console when
         * tests are not passing when you expect them to.
         */
        debug(): String;

        /**
         * Returns the type of the current node of this wrapper. If it's a composite component, this will be the
         * component constructor. If it's native DOM node, it will be a string of the tag name.
         *
         * Note: can only be called on a wrapper of a single node.
         */
        type(): String | Function;

        /**
         * Iterates through each node of the current wrapper and executes the provided function with a wrapper around
         * the corresponding node passed in as the first argument.
         *
         * Returns itself.
         * @param fn A callback to be run for every node in the collection. Should expect a ShallowWrapper as the first
         *              argument, and will be run with a context of the original instance.
         */
        forEach(fn: (wrapper: ShallowWrapper<P, S>) => void): T;

        /**
         * Maps the current array of nodes to another array. Each node is passed in as a ShallowWrapper to the map
         * function.
         * Returns an array of the returned values from the mapping function..
         * @param fn A mapping function to be run for every node in the collection, the results of which will be mapped
         *              to the returned array. Should expect a ShallowWrapper as the first argument, and will be run
         *              with a context of the original instance.
         */
        map(fn: (wrapper: ShallowWrapper<P, S>) => any): Array<any>;

        /**
         * Applies the provided reducing function to every node in the wrapper to reduce to a single value. Each node
         * is passed in as a ShallowWrapper, and is processed from left to right.
         * @param fn
         * @param initialValue
         */
        reduce<R>(fn: (prevVal: R, wrapper: ShallowWrapper<P, S>, index: number) => R, initialValue?: R): R[];

        /**
         * Applies the provided reducing function to every node in the wrapper to reduce to a single value.
         * Each node is passed in as a ShallowWrapper, and is processed from right to left.
         * @param fn
         * @param initialValue
         */
        reduceRight<R>(fn: (prevVal: R, wrapper: ShallowWrapper<P, S>, index: number) => R, initialValue?: R): R[];

        /**
         * Returns whether or not any of the nodes in the wrapper match the provided selector.
         * @param selector
         */
        some(selector: EnzymeSelector): Boolean;

        /**
         * Returns whether or not any of the nodes in the wrapper pass the provided predicate function.
         * @param fn
         */
        someWhere(fn: (wrapper: ShallowWrapper<P, S>) => Boolean): Boolean;

        /**
         * Returns whether or not all of the nodes in the wrapper match the provided selector.
         * @param selector
         */
        every(selector: EnzymeSelector): Boolean;

        /**
         * Returns whether or not any of the nodes in the wrapper pass the provided predicate function.
         * @param fn
         */
        everyWhere(fn: (wrapper: ShallowWrapper<P, S>) => Boolean): Boolean;

        length: number;
    }

    export interface ShallowWrapper<P, S> extends CommonWrapper<ShallowWrapper<P, S>, P, S> {
        shallow(): ShallowWrapper<P, S>;

        render(): CheerioWrapper<P, S>;
    }

    export interface ReactWrapper<P, S> extends CommonWrapper<ReactWrapper<P, S>, P, S> {

    }

    export interface CheerioWrapper<P, S> extends CommonWrapper<CheerioWrapper<P, S>, P, S> {

    }

    /**
     * Shallow rendering is useful to constrain yourself to testing a component as a unit, and to ensure that
     * your tests aren't indirectly asserting on behavior of child components.
     * @param node
     * @param [options]
     */
    export function shallow<P, S>(node: ReactElement<P>, options?: any): ShallowWrapper<P, S>;

    /**
     * Mounts and renders a react component into the document and provides a testing wrapper around it.
     * @param node
     * @param [options]
     */
    export function mount<P, S>(node: ReactElement<P>, options?: any): ReactWrapper<P, S>;

    /**
     * Render react components to static HTML and analyze the resulting HTML structure.
     * @param node
     * @param [options]
     */
    export function render<P, S>(node: ReactElement<P>, options?: any): CheerioWrapper<P, S>;

    export function describeWithDOM(description: String, fn: Function): void;

    export function spyLifecycle(component: typeof Component): void;
}