mithril.d.ts

// Mithril type definitions for Typescript. Note that changes to this *must* be
// mirrored in the module export file in index.d.ts

/**
* This is the module containing all the types/declarations/etc. for Mithril
*/
declare namespace Mithril {
	interface ChildArray extends Array<Children> {}
	type Children = Child | ChildArray;
	type Child = string | VirtualElement | Component<Controller>;

	interface Static {
		/**
		* Creates a virtual element for use with m.render, m.mount, etc.
		*
		* @param selector A simple CSS selector. May include SVG tags. Nested
		* selectors are not supported.
		* @param attributes Attributes to add. Any DOM attribute may be used
		* as an attribute, although innerHTML and the like may be overwritten
		* silently.
		* @param children Child elements, components, and text to add.
		* @return A virtual element.
		*
		* @see m.render
		* @see m.mount
		* @see m.component
		*/
		(
			selector: string,
			...children: Children[]
		): VirtualElement;

		/**
		* Creates a virtual element for use with m.render, m.mount, etc.
		*
		* @param selector A simple CSS selector. May include SVG tags. Nested
		* selectors are not supported.
		* @param attributes Attributes to add. Any DOM attribute may be used
		* as an attribute, although innerHTML and the like may be overwritten
		* silently.
		* @param children Child elements, components, and text to add.
		* @return A virtual element.
		*
		* @see m.render
		* @see m.mount
		* @see m.component
		*/
		(
			selector: string,
			attributes: Attributes,
			...children: Children[]
		): VirtualElement;

		/**
		* Initializes a component for use with m.render, m.mount, etc.
		*
		* @param component A component.
		* @param args Arguments to optionally pass to the component.
		* @return A component.
		*
		* @see m.render
		* @see m.mount
		* @see m
		*/
		<T extends Controller>(
			component: Component<T>,
			...args: any[]
		): Component<T>;

		/**
		* Creates a getter-setter function that wraps a Mithril promise. Useful
		* for uniform data access, m.withAttr, etc.
		*
		* @param promise A thennable to initialize the property with. It may
		* optionally be a Mithril promise.
		* @return A getter-setter function wrapping the promise.
		*
		* @see m.withAttr
		*/
		prop<T>(promise: Thennable<T>) : Promise<T>;

		/**
		* Creates a getter-setter function that wraps a simple value. Useful
		* for uniform data access, m.withAttr, etc.
		*
		* @param value A value to initialize the property with
		* @return A getter-setter function wrapping the value.
		*
		* @see m.withAttr
		*/
		prop<T>(value: T): BasicProperty<T>;

		/**
		* Creates a getter-setter function that wraps a simple value. Useful
		* for uniform data access, m.withAttr, etc.
		*
		* @return A getter-setter function wrapping the value.
		*
		* @see m.withAttr
		*/
		prop<T>(): BasicProperty<T>;

		/**
		* Returns a event handler that can be bound to an element, firing with
		* the specified property.
		*
		* @param property The property to get from the event.
		* @param callback The handler to use the value from the event.
		* @return A function suitable for listening to an event.
		*/
		withAttr(
			property: string,
			callback: (value: any) => any,
			callbackThis?: any
		): (e: Event) => void;

		/**
		* @deprecated Use m.mount instead
		*/
		module<T extends Controller>(
			rootElement: Node,
			component: Component<T>
		): T;

		/**
		* Mounts a component to a base DOM node.
		*
		* @param rootElement The base node.
		* @param component The component to mount.
		* @return An instance of the top-level component's controller
		*/
		mount<T extends Controller>(
			rootElement: Node,
			component: Component<T>
		): T;

		/**
		* Initializes a component for use with m.render, m.mount, etc.
		*
		* @param selector A component.
		* @param args Arguments to optionally pass to the component.
		* @return A component.
		*
		* @see m.render
		* @see m.mount
		* @see m
		*/
		component<T extends Controller>(
			component: Component<T>,
			...args: any[]
		): Component<T>;

		/**
		* Trust this string of HTML.
		*
		* @param html The HTML to trust
		* @return A String object instance with an added internal flag to mark
		* it as trusted.
		*/
		trust(html: string): TrustedString;

		/**
		* Render a virtual DOM tree.
		*
		* @param rootElement The base element/node to render the tree from.
		* @param children One or more child nodes to add to the tree.
		* @param forceRecreation If true, overwrite the entire tree without
		* diffing against it.
		*/
		render(
			rootElement: Element,
			children: VirtualElement|VirtualElement[],
			forceRecreation?: boolean
		): void;

		redraw: {
			/**
			* Force a redraw the active component. It redraws asynchronously by
			* default to allow for simultaneous events to run before redrawing,
			* such as the event combination keypress + input frequently used for
			* input.
			*
			* @param force If true, redraw synchronously.
			*/
			(force?: boolean): void;

			/**
			* Gets/sets the current redraw strategy, which returns one of the
			* following:
			*
			* "all" - recreates the DOM tree from scratch
			* "diff" - recreates the DOM tree from scratch
			* "none" - leaves the DOM tree intact
			*
			* This is useful for event handlers, which may want to cancel
			* the next redraw if the event doesn't update the UI.
			*
			* @return The current strategy
			*/
			strategy: BasicProperty<"all" | "diff" | "none">;
		}

		route: {
			/**
			* Enable routing, mounting a controller based on the route. It
			* automatically mounts the components for you, starting with the one
			* specified by the default route.
			*
			* @param rootElement The element to mount the active controller to.
			* @param defaultRoute The route to start with.
			* @param routes A key-value mapping of pathname to controller.
			*/
			(
				rootElement: Element,
				defaultRoute: string,
				routes: Routes
			): void;

			/**
			* This allows m.route to be used as the `config` attribute for a
			* virtual element, particularly useful for cases like this:
			*
			* ```ts
			* // Note that the '#' is not required in `href`, thanks to the
			* `config` setting.
			* m("a[href='/dashboard/alicesmith']", {config: m.route});
			* ```
			*/
			(
				element: Element,
				isInitialized: boolean,
				context?: Context,
				vdom?: VirtualElement
			): void;

			/**
			* Programmatically redirect to another route.
			*
			* @param path The route to go to.
			* @param params Parameters to pass as a query string.
			* @param shouldReplaceHistory Whether to replace the current history
			* instead of adding a new one.
			*/
			(path: string, params?: any, shouldReplaceHistory?: boolean): void;

			/**
			* Gets the current route.
			*
			* @return The current route.
			*/
			(): string;

			/**
			* Gets a route parameter.
			*
			* @param key The key to get.
			* @return The value associated with the parameter key.
			*/
			param(key: string): string;

			/**
			* The current routing mode. This may be changed before calling
			* m.route to change the part of the URL used to perform the routing.
			*
			* The value can be set to one of the following, defaulting to
			* "hash":
			*
			* "search" - Uses the query string. This allows for named anchors to
			* work on the page, but changes cause IE8 and lower to refresh the
			* page.
			*
			* "hash" - Uses the hash. This is the only routing mode that does
			* not cause page refreshes on any browser, but it does not support
			* named anchors.
			*
			* "pathname" - Uses the URL pathname. This requires server-side
			* setup to support bookmarking and page refreshes. It always causes
			* page refreshes on IE8 and lower. Note that this requires that the
			* application to be run from the root of the URL.
			*/
			mode: "search" | "hash" | "pathname";

			/**
			* Serialize an object into a query string.
			*
			* @param data The data to serialize.
			* @return The serialized string.
			*/
			buildQueryString(data: Object): string;

			/**
			* Parse a query string into an object.
			*
			* @param data The data to parse.
			* @return The parsed object data.
			*/
			parseQueryString(data: string): Object;
		}

		/**
		* Send an XHR request to a server. Note that the `url` option is
		* required.
		*
		* @param options The options to use for the request.
		* @return A promise to the returned data, or void if not applicable.
		*
		* @see XHROptions for the available options.
		*/
		request(options: XHROptions): Promise<any>

		/**
		* Send a JSONP request to a server. Note that the `url` option is
		* required.
		*
		* @param options The options to use
		* @return A promise to the returned data.
		*
		* @see JSONPOptions for the available options.
		*/
		request(options: JSONPOptions): Promise<any>;

		deferred: {
			/**
			* Create a Mithril deferred object. It behaves synchronously if
			* possible, an intentional deviation from Promises/A+. Note that
			* deferreds are completely separate from the redrawing system, and
			* never trigger a redraw on their own.
			*
			* @return A new Mithril deferred instance.
			*
			* @see m.deferred.onerror for the error callback called for Error
			* subclasses
			*/
			<T>(): Deferred<T>;

			/**
			* A callback for all uncaught native Error subclasses in deferreds.
			* This defaults to synchronously rethrowing all errors, a deviation
			* from Promises/A+, but the behavior is configurable. To restore
			* Promises/A+-compatible behavior. simply set this to a no-op.
			*/
			onerror(e: Error): void;
		}

		/**
		* Takes a list of promises or thennables and returns a Mithril promise
		* that resolves once all in the list are resolved, or rejects if any of
		* them reject.
		*
		* @param promises A list of promises to try to resolve.
		* @return A promise that resolves to all the promises if all resolve, or
		* rejects with the error contained in the first rejection.
		*/
		sync<T>(promises: Thennable<T>[]): Promise<T[]>;

		/**
		* Use this and endComputation if your views aren't redrawing after
		* calls to third-party libraries. For integrating asynchronous code,
		* this should be called before any asynchronous work is done. For
		* synchronous code, this should be called at the beginning of the
		* problematic segment. Note that these calls must be balanced, much like
		* braces and parentheses. This is mostly used internally. Prefer
		* m.redraw where possible, especially when making repeated calls.
		*
		* @see endComputation
		* @see m.render
		*/
		startComputation(): void;

		/**
		* Use startComputation and this if your views aren't redrawing after
		* calls to third-party libraries. For integrating asynchronous code,
		* this should be called after all asynchronous work completes. For
		* synchronous code, this should be called at the end of the problematic
		* segment. Note that these calls must be balanced, much like braces and
		* parentheses. This is mostly used internally. Prefer m.redraw where
		* possible, especially when making repeated calls.
		*
		* @see startComputation
		* @see m.render
		*/
		endComputation(): void;

		/**
		* This overwrites the internal version of window used by Mithril.
		* It's mostly useful for testing, and is also used internally by
		* Mithril to test itself. By default Mithril uses `window` for the
		* dependency.
		*
		* @param mockWindow The mock to use for the window.
		* @return The mock that was passed in.
		*/
		deps(mockWindow: Window): Window;
	}

	interface TrustedString extends String {
		/** @private Implementation detail. Don't depend on it. */
		$trusted: boolean;
	}

	/**
	* The interface for a virtual element. It's best to consider this immutable
	* for most use cases.
	*
	* @see m
	*/
	interface VirtualElement {
		/**
		* The tag name of this element.
		*/
		tag: string;

		/**
		* The attributes of this element.
		*/
		attrs: Attributes;

		/**
		* The children of this element.
		*/
		children: Children[];
	}

	/**
	* An event passed by Mithril to unload event handlers.
	*/
	interface Event {
		/**
		* Prevent the default behavior of scrolling the page and updating the
		* URL on next route change.
		*/
		preventDefault(): void;
	}

	/**
	* A context object for configuration functions.
	*
	* @see ElementConfig
	*/
	interface Context {
		/**
		* A function to call when the node is unloaded. Useful for cleanup.
		*/
		onunload?(): any;

		/**
		* Set true if the backing DOM node needs to be retained between route
		* changes if possible. Set false if this node needs to be recreated
		* every single time, regardless of how "different" it is.
		*/
		retain?: boolean;
	}

	/**
	* This represents a callback function for a virtual element's config
	* attribute. It's a low-level function useful for extra cleanup after
	* removal from the tree, storing instances of third-party classes that
	* need to be associated with the DOM, etc.
	*
	* @see Attributes
	* @see Context
	*/
	interface ElementConfig {
		/**
		* A callback function for a virtual element's config attribute.
		*
		* @param element The associated DOM element.
		* @param isInitialized Whether this is the first call for the virtual
		* element or not.
		* @param context The associated context for this element.
		* @param vdom The associated virtual element.
		*/
		(
			element: Element,
			isInitialized: boolean,
			context: Context,
			vdom: VirtualElement
		): void;
	}

	/**
	* This represents the attributes available for configuring virtual elements,
	* beyond the applicable DOM attributes.
	*
	* @see m
	*/
	interface Attributes {
		/**
		* The class name(s) for this virtual element, as a space-separated list.
		*/
		className?: string;

		/**
		* The class name(s) for this virtual element, as a space-separated list.
		*/
		class?: string;

		/**
		* A custom, low-level configuration in case this element needs special
		* cleanup after removal from the tree.
		*
		* @see ElementConfig
		*/
		config?: ElementConfig;

		/**
		* A key to optionally associate with this element.
		*/
		key?: string | number;

		/**
		* Any other virtual element properties, including attributes and event
		* handlers.
		*/
		[property: string]: any;
	}

	/**
	* The basis of a Mithril controller instance.
	*/
	interface Controller {
		/**
		* An optional handler to call when the associated virtual element is
		* destroyed.
		*
		* @param evt An associated event.
		*/
		onunload?(evt: Event): any;
	}

	/**
	* This represents a controller function.
	*
	* @see ControllerConstructor
	*/
	interface ControllerFunction<T extends Controller> {
		(...args: any[]): T;
	}

	/**
	* This represents a controller constructor.
	*
	* @see ControllerFunction
	*/
	interface ControllerConstructor<T extends Controller> {
		new (...args: any[]): T;
	}

	/**
	* This represents a Mithril component.
	*
	* @see m
	* @see m.component
	*/
	interface Component<T extends Controller> {
		/**
		* The component's controller.
		*
		* @see m.component
		*/
		controller: ControllerFunction<T> | ControllerConstructor<T>;

		/**
		* Creates a view out of virtual elements.
		*
		* @see m.component
		*/
		view(ctrl?: T, ...args: any[]): VirtualElement;
	}

	/**
	* This is the base interface for property getter-setters
	*
	* @see m.prop
	*/
	interface Property<T> {
		/**
		* Gets the contained value.
		*
		* @return The contained value.
		*/
		(): T;

		/**
		* Sets the contained value.
		*
		* @param value The new value to set.
		* @return The newly set value.
		*/
		(value: T): T;
	}

	/**
	* This represents a non-promise getter-setter functions.
	*
	* @see m.prop which returns objects that implement this interface.
	*/
	interface BasicProperty<T> extends Property<T> {
		/**
		* Makes this serializable to JSON.
		*/
		toJSON(): T;
	}

	/**
	* This represents a key-value mapping linking routes to components.
	*/
	interface Routes {
		/**
		* The key represents the route. The value represents the corresponding
		* component.
		*/
		[key: string]: Component<Controller>;
	}

	/**
	* This represents a Mithril deferred object.
	*/
	interface Deferred<T> {
		/**
		* Resolve this deferred's promise with a value.
		*
		* @param value The value to resolve the promise with.
		*/
		resolve(value?: T): void;

		/**
		* Reject this deferred with an error.
		*
		* @param value The reason for rejecting the promise.
		*/
		reject(reason?: any): void;

		/**
		* The backing promise.
		*
		* @see Promise
		*/
		promise: Promise<T>;
	}

	/**
	* This represents a thennable success callback.
	*/
	interface SuccessCallback<T, U> {
		(value: T): U | Thennable<U>;
	}

	/**
	* This represents a thennable error callback.
	*/
	interface ErrorCallback<T> {
		(value: Error): T | Thennable<T>;
	}

	/**
	* This represents a thennable.
	*/
	interface Thennable<T> {
		then<U>(success: SuccessCallback<T, U>): Thennable<U>;
		then<U, V>(success: SuccessCallback<T, U>, error: ErrorCallback<V>): Thennable<U | V>;
		catch?(error: ErrorCallback<T>): Thennable<T>;
		catch?<U>(error: ErrorCallback<U>): Thennable<T | U>;
	}

	/**
	* This represents a Mithril promise object.
	*/
	interface Promise<T> extends Thennable<T>, Property<T | Promise<T>> {
		/**
		* Chain this promise with a simple success callback, propogating
		* rejections.
		*
		* @param success The callback to call when the promise is resolved.
		* @return The chained promise.
		*/
		then<U>(success: SuccessCallback<T, U>): Promise<U>;

		/**
		* Chain this promise with a success callback and error callback, without
		* propogating rejections.
		*
		* @param success The callback to call when the promise is resolved.
		* @param error The callback to call when the promise is rejected.
		* @return The chained promise.
		*/
		then<U, V>(success: SuccessCallback<T, U>, error: ErrorCallback<V>): Promise<U | V>;

		/**
		* Chain this promise with a single error callback, without propogating
		* rejections.
		*
		* @param error The callback to call when the promise is rejected.
		* @return The chained promise.
		*/
		catch<U>(error: ErrorCallback<U>): Promise<T | U>;
	}

	/**
	 * These are the common options shared across normal and JSONP requests.
	 *
	 * @see m.request
	 */
	interface RequestOptions {
		/**
		* The data to be sent. It's automatically serialized in the right format
		* depending on the method (with exception of HTML5 FormData), and put in
		* the appropriate section of the request.
		*/
		data?: any;

		/**
		* Whether to run it in the background, i.e. true if it doesn't affect
		* template rendering.
		*/
		background?: boolean;

		/**
		* Set an initial value while the request is working, to populate the
		* promise getter-setter.
		*/
		initialValue?: any;

		/**
		* An optional preprocessor function to unwrap a successful response, in
		* case the response contains metadata wrapping the data.
		*
		* @param data The data to unwrap.
		* @return The unwrapped result.
		*/
		unwrapSuccess?(data: any): any;

		/**
		* An optional preprocessor function to unwrap an unsuccessful response,
		* in case the response contains metadata wrapping the data.
		*
		* @param data The data to unwrap.
		* @return The unwrapped result.
		*/
		unwrapError?(data: any): any;

		/**
		* An optional function to serialize the data. This defaults to
		* `JSON.stringify`.
		*
		* @param dataToSerialize The data to serialize.
		* @return The serialized form as a string.
		*/
		serialize?(dataToSerialize: any): string;

		/**
		* An optional function to deserialize the data. This defaults to
		* `JSON.parse`.
		*
		* @param dataToSerialize The data to parse.
		* @return The parsed form.
		*/
		deserialize?(dataToDeserialize: string): any;

		/**
		* An optional function to extract the data from a raw XMLHttpRequest,
		* useful if the relevant data is in a response header or the status
		* field.
		*
		* @param xhr The associated XMLHttpRequest.
		* @param options The options passed to this request.
		* @return string The serialized format.
		*/
		extract?(xhr: XMLHttpRequest, options: this): string;

		/**
		* The parsed data, or its children if it's an array, will be passed to
		* this class constructor if it's given, to parse it into classes.
		*
		* @param data The data to parse.
		* @return The new instance for the list.
		*/
		type?: new (data: any) => any;

		/**
		* The URL to send the request to.
		*/
		url: string;
	}

	/**
	* This represents the available options for configuring m.request for JSONP
	* requests.
	*
	* @see m.request
	*/
	interface JSONPOptions extends RequestOptions {
		/**
		* For JSONP requests, this must be the string "jsonp". Otherwise, it's
		* ignored.
		*/
		dataType: "jsonp";

		/**
		* The querystring key for the JSONP request callback. This is useful for
		* APIs that don't use common conventions, such as
		* `www.example.com/?jsonpCallback=doSomething`. It defaults to
		* `callback`.
		*/
		callbackKey?: string;

		/**
		 * The data to send with the request. This is automatically serialized
		 * to a querystring.
		 */
		data?: Object;
	}

	/**
	* This represents the available options for configuring m.request for
	* standard AJAX requests.
	*
	* @see m.request
	*/
	interface XHROptions extends RequestOptions {
		/**
		* This represents the HTTP method used, defaulting to "GET".
		*/
		method: "GET" | "POST" | "PUT" | "DELETE" | "HEAD" | "OPTIONS";

		/**
		* The username for HTTP authentication.
		*/
		user?: string;

		/**
		* The password for HTTP authentication.
		*/
		password?: string;

		/**
		* An optional function to run between `open` and `send`, useful for
		* adding request headers or using XHR2 features such as the `upload`
		* property. It is even possible to override the XHR altogether with a
		* similar object, such as an XDomainRequest instance.
		*
		* @param xhr The associated XMLHttpRequest.
		* @param options The options passed to this request.
		* @return The new XMLHttpRequest, or nothing if the same one is kept.
		*/
		config?(xhr: XMLHttpRequest, options: this): any;

		/**
		 * The data to send with the request.
		 */
		data?: Object;
	}
}

declare const m: Mithril.Static;

declare module "mithril" {
    export = m;
}