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🤖 Merge PR DefinitelyTyped#74154 [w3c-screen-capture] Add type definitions for Screen capture by @paulinagacek 
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‎types/w3c-screen-capture/.npmignore‎

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*
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!**/*.d.ts
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!**/*.d.cts
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!**/*.d.mts
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!**/*.d.*.ts

‎types/w3c-screen-capture/index.d.ts‎

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/**
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* @see https://w3c.github.io/mediacapture-screen-share
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*/
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declare global {
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interface MediaDevices {
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getDisplayMedia(options?: DisplayMediaStreamOptions): Promise<MediaStream>;
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}
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}
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export interface UserMediaStreamConstraints {
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/** @default false */
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video?: boolean | MediaTrackConstraints;
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/** @default false */
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audio?: boolean | MediaTrackConstraints;
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}
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export type CaptureStartFocusBehavior =
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| "focus-capturing-application"
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| "focus-captured-surface"
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| "no-focus-change";
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declare global {
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class CaptureController extends EventTarget {
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constructor();
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setFocusBehavior(focusBehavior: CaptureStartFocusBehavior): void;
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}
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}
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export type SelfCapturePreferenceEnum =
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| "include"
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| "exclude";
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export type SystemAudioPreferenceEnum =
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| "include"
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| "exclude";
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export type WindowAudioPreferenceEnum =
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| "system"
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| "window"
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| "exclude";
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export type SurfaceSwitchingPreferenceEnum =
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| "include"
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| "exclude";
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export type MonitorTypeSurfacesEnum =
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| "include"
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| "exclude";
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export interface DisplayMediaStreamOptions {
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/** @default true */
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video?: boolean | MediaTrackConstraints;
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/** @default false */
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audio?: boolean | MediaTrackConstraints;
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controller?: CaptureController;
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selfBrowserSurface?: SelfCapturePreferenceEnum;
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systemAudio?: SystemAudioPreferenceEnum;
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windowAudio?: WindowAudioPreferenceEnum;
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surfaceSwitching?: SurfaceSwitchingPreferenceEnum;
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monitorTypeSurfaces?: MonitorTypeSurfacesEnum;
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}
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export interface MediaTrackSupportedConstraints {
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/** @default true */
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displaySurface?: boolean;
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/** @default true */
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logicalSurface?: boolean;
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/** @default true */
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cursor?: boolean;
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/** @default true */
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restrictOwnAudio?: boolean;
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/** @default true */
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suppressLocalAudioPlayback?: boolean;
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}
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export interface MediaTrackConstraintSet {
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displaySurface?: ConstrainDOMString;
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logicalSurface?: ConstrainBoolean;
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cursor?: ConstrainDOMString;
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restrictOwnAudio?: ConstrainBoolean;
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suppressLocalAudioPlayback?: ConstrainBoolean;
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}
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export interface MediaTrackSettings {
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displaySurface?: string;
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logicalSurface?: boolean;
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cursor?: string;
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restrictOwnAudio?: boolean;
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suppressLocalAudioPlayback?: boolean;
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screenPixelRatio?: number;
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}
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export interface MediaTrackCapabilities {
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displaySurface?: string;
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logicalSurface?: boolean;
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cursor?: string[];
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}
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export type DisplayCaptureSurfaceType =
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| "monitor"
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| "window"
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| "browser";
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export type CursorCaptureConstraint =
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| "never"
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| "always"
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| "motion";

‎types/w3c-screen-capture/package.json‎

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{
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"private": true,
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"nonNpm": true,
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"nonNpmDescription": "Implementation of Isolated Web App (IWA) APIs resides in Chromium.",
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"name": "@types/w3c-screen-capture",
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"version": "0.0.9999",
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"projects": [
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"https://github.com/WICG/isolated-web-apps"
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],
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"devDependencies": {
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"@types/web": "*",
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"@types/w3c-screen-capture": "workspace:."
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},
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"owners": [
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{
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"name": "Paulina Gacek",
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"githubUsername": "paulinagacek"
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},
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{
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"name": "Andrew Rayskiy",
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"githubUsername": "GrapeGreen"
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},
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{
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"name": "Simon Hangl",
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"githubUsername": "shangl"
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}
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]
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}

‎types/w3c-screen-capture/tsconfig.json‎

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{
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"compilerOptions": {
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"module": "node16",
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"lib": [
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"es6",
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"dom"
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],
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"noImplicitAny": true,
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"noImplicitThis": true,
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"strictFunctionTypes": true,
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"strictNullChecks": true,
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"types": [],
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"noEmit": true,
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"forceConsistentCasingInFileNames": true,
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"paths": {
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"w3c-screen-capture": [
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"./index.d.ts"
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]
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}
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},
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"files": [
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"index.d.ts",
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"w3c-screen-capture-tests.ts"
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]
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}

‎types/w3c-screen-capture/w3c-screen-capture-tests.ts‎

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import { DisplayMediaStreamOptions, MediaTrackConstraintSet } from "w3c-screen-capture";
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function testCaptureController() {
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const controller = new CaptureController();
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// Valid behaviors
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// $ExpectType void
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controller.setFocusBehavior("focus-captured-surface");
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// $ExpectType void
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controller.setFocusBehavior("focus-capturing-application");
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// $ExpectType void
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controller.setFocusBehavior("no-focus-change");
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// Inheritance check (EventTarget)
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controller.addEventListener("focus", () => {});
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// @ts-expect-error - Invalid enum value
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controller.setFocusBehavior("focus-unknown");
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}
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async function testGetDisplayMedia() {
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const controller = new CaptureController();
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const options: DisplayMediaStreamOptions = {
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video: true,
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audio: false,
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// Advanced Enum preferences
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controller: controller,
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selfBrowserSurface: "include",
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systemAudio: "exclude",
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windowAudio: "window",
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surfaceSwitching: "include",
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monitorTypeSurfaces: "exclude",
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};
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const stream = await navigator.mediaDevices.getDisplayMedia(options);
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const track = stream.getTracks()[0];
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track.stop();
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}
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function testConstraints() {
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// Verifying the extension of constraints
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const constraints: MediaTrackConstraintSet = {
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// New Screen Share specific constraints
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displaySurface: "monitor",
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logicalSurface: true,
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cursor: "motion",
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restrictOwnAudio: false,
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suppressLocalAudioPlayback: true,
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};
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const complexOptions: DisplayMediaStreamOptions = {
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video: constraints,
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audio: { echoCancellation: true },
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};
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}
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function testSettings(track: MediaStreamTrack) {
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const settings: MediaTrackSettings = track.getSettings();
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if (settings.displaySurface === "window") {
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console.log("Captured a window");
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}
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// @ts-expect-error - Type 'number' is not comparable to type 'string'
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if (settings.cursor === 123) {}
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}

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