Gecko [ dp-client.com ]

Name	Size	Permission
README.md	1.65 KB	-rw-r--r--
check-coverage.js	1.58 KB	-rw-r--r--
clean-page.js	626 B	-rw-r--r--
deterministic-injection.js	1.31 KB	-rw-r--r--
puppeteer.js	15.81 KB	-rw-r--r--

( function () {

/* Deterministic random */

window.Math._random = window.Math.random;

let seed = Math.PI / 4;
	window.Math.random = function () {

const x = Math.sin( seed ++ ) * 10000;
		return x - Math.floor( x );

};

/* Deterministic timer */

window.performance._now = performance.now;

let frameId = 0;
	const now = () => frameId * 16;
	window.Date.now = now;
	window.Date.prototype.getTime = now;
	window.performance.now = now;

/* Deterministic RAF */

const RAF = window.requestAnimationFrame;
	window._renderStarted = false;
	window._renderFinished = false;

const maxFrameId = 2;
	window.requestAnimationFrame = function ( cb ) {

if ( ! window._renderStarted ) {

setTimeout( function () {

requestAnimationFrame( cb );

}, 50 );

} else {

RAF( function () {

if ( frameId ++ < maxFrameId ) {

cb( now() );

} else {

window._renderFinished = true;

}

} );

}

};

/* Semi-determitistic video */

const play = HTMLVideoElement.prototype.play;

HTMLVideoElement.prototype.play = async function () {

play.call( this );
		this.addEventListener( 'timeupdate', () => this.pause() );

function renew() {

this.load();
			play.call( this );
			RAF( renew );

}

RAF( renew );

};

/* Additional variable for ~5 examples */

window.TESTING = true;

}() );