754 lines
21 KiB
TypeScript
754 lines
21 KiB
TypeScript
/**
|
|
* Copyright 2019 Google Inc. All rights reserved.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
import * as fs from 'fs';
|
|
import { helper, assert } from './helper';
|
|
import { LifecycleWatcher, PuppeteerLifeCycleEvent } from './LifecycleWatcher';
|
|
import { TimeoutError } from './Errors';
|
|
import { JSHandle, ElementHandle } from './JSHandle';
|
|
import { ExecutionContext } from './ExecutionContext';
|
|
import { TimeoutSettings } from './TimeoutSettings';
|
|
import { MouseButtonInput } from './Input';
|
|
import { FrameManager, Frame } from './FrameManager';
|
|
import { getQueryHandlerAndSelector, QueryHandler } from './QueryHandler';
|
|
|
|
// This predicateQueryHandler is declared here so that TypeScript knows about it
|
|
// when it is used in the predicate function below.
|
|
declare const predicateQueryHandler: QueryHandler;
|
|
|
|
const readFileAsync = helper.promisify(fs.readFile);
|
|
|
|
export interface WaitForSelectorOptions {
|
|
visible?: boolean;
|
|
hidden?: boolean;
|
|
timeout?: number;
|
|
}
|
|
|
|
export class DOMWorld {
|
|
_frameManager: FrameManager;
|
|
_frame: Frame;
|
|
_timeoutSettings: TimeoutSettings;
|
|
_documentPromise?: Promise<ElementHandle> = null;
|
|
_contextPromise?: Promise<ExecutionContext> = null;
|
|
|
|
_contextResolveCallback?: (x?: ExecutionContext) => void = null;
|
|
|
|
_detached = false;
|
|
_waitTasks = new Set<WaitTask>();
|
|
|
|
constructor(
|
|
frameManager: FrameManager,
|
|
frame: Frame,
|
|
timeoutSettings: TimeoutSettings
|
|
) {
|
|
this._frameManager = frameManager;
|
|
this._frame = frame;
|
|
this._timeoutSettings = timeoutSettings;
|
|
this._setContext(null);
|
|
}
|
|
|
|
frame(): Frame {
|
|
return this._frame;
|
|
}
|
|
|
|
/**
|
|
* @param {?ExecutionContext} context
|
|
*/
|
|
_setContext(context?: ExecutionContext): void {
|
|
if (context) {
|
|
this._contextResolveCallback.call(null, context);
|
|
this._contextResolveCallback = null;
|
|
for (const waitTask of this._waitTasks) waitTask.rerun();
|
|
} else {
|
|
this._documentPromise = null;
|
|
this._contextPromise = new Promise((fulfill) => {
|
|
this._contextResolveCallback = fulfill;
|
|
});
|
|
}
|
|
}
|
|
|
|
_hasContext(): boolean {
|
|
return !this._contextResolveCallback;
|
|
}
|
|
|
|
_detach(): void {
|
|
this._detached = true;
|
|
for (const waitTask of this._waitTasks)
|
|
waitTask.terminate(
|
|
new Error('waitForFunction failed: frame got detached.')
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @return {!Promise<!ExecutionContext>}
|
|
*/
|
|
executionContext(): Promise<ExecutionContext> {
|
|
if (this._detached)
|
|
throw new Error(
|
|
`Execution Context is not available in detached frame "${this._frame.url()}" (are you trying to evaluate?)`
|
|
);
|
|
return this._contextPromise;
|
|
}
|
|
|
|
/**
|
|
* @param {Function|string} pageFunction
|
|
* @param {!Array<*>} args
|
|
* @return {!Promise<!JSHandle>}
|
|
*/
|
|
async evaluateHandle(
|
|
pageFunction: Function | string,
|
|
...args: unknown[]
|
|
): Promise<JSHandle> {
|
|
const context = await this.executionContext();
|
|
return context.evaluateHandle(pageFunction, ...args);
|
|
}
|
|
|
|
/**
|
|
* @param {Function|string} pageFunction
|
|
* @param {!Array<*>} args
|
|
* @return {!Promise<*>}
|
|
*/
|
|
async evaluate<ReturnType extends any>(
|
|
pageFunction: Function | string,
|
|
...args: unknown[]
|
|
): Promise<ReturnType> {
|
|
const context = await this.executionContext();
|
|
return context.evaluate<ReturnType>(pageFunction, ...args);
|
|
}
|
|
|
|
/**
|
|
* @param {string} selector
|
|
* @return {!Promise<?ElementHandle>}
|
|
*/
|
|
async $(selector: string): Promise<ElementHandle | null> {
|
|
const document = await this._document();
|
|
const value = await document.$(selector);
|
|
return value;
|
|
}
|
|
|
|
async _document(): Promise<ElementHandle> {
|
|
if (this._documentPromise) return this._documentPromise;
|
|
this._documentPromise = this.executionContext().then(async (context) => {
|
|
const document = await context.evaluateHandle('document');
|
|
return document.asElement();
|
|
});
|
|
return this._documentPromise;
|
|
}
|
|
|
|
async $x(expression: string): Promise<ElementHandle[]> {
|
|
const document = await this._document();
|
|
const value = await document.$x(expression);
|
|
return value;
|
|
}
|
|
|
|
async $eval<ReturnType extends any>(
|
|
selector: string,
|
|
pageFunction: Function | string,
|
|
...args: unknown[]
|
|
): Promise<ReturnType> {
|
|
const document = await this._document();
|
|
return document.$eval<ReturnType>(selector, pageFunction, ...args);
|
|
}
|
|
|
|
async $$eval<ReturnType extends any>(
|
|
selector: string,
|
|
pageFunction: Function | string,
|
|
...args: unknown[]
|
|
): Promise<ReturnType> {
|
|
const document = await this._document();
|
|
const value = await document.$$eval<ReturnType>(
|
|
selector,
|
|
pageFunction,
|
|
...args
|
|
);
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* @param {string} selector
|
|
* @return {!Promise<!Array<!ElementHandle>>}
|
|
*/
|
|
async $$(selector: string): Promise<ElementHandle[]> {
|
|
const document = await this._document();
|
|
const value = await document.$$(selector);
|
|
return value;
|
|
}
|
|
|
|
async content(): Promise<string> {
|
|
return await this.evaluate(() => {
|
|
let retVal = '';
|
|
if (document.doctype)
|
|
retVal = new XMLSerializer().serializeToString(document.doctype);
|
|
if (document.documentElement)
|
|
retVal += document.documentElement.outerHTML;
|
|
return retVal;
|
|
});
|
|
}
|
|
|
|
async setContent(
|
|
html: string,
|
|
options: {
|
|
timeout?: number;
|
|
waitUntil?: PuppeteerLifeCycleEvent | PuppeteerLifeCycleEvent[];
|
|
} = {}
|
|
): Promise<void> {
|
|
const {
|
|
waitUntil = ['load'],
|
|
timeout = this._timeoutSettings.navigationTimeout(),
|
|
} = options;
|
|
// We rely upon the fact that document.open() will reset frame lifecycle with "init"
|
|
// lifecycle event. @see https://crrev.com/608658
|
|
await this.evaluate((html) => {
|
|
document.open();
|
|
document.write(html);
|
|
document.close();
|
|
}, html);
|
|
const watcher = new LifecycleWatcher(
|
|
this._frameManager,
|
|
this._frame,
|
|
waitUntil,
|
|
timeout
|
|
);
|
|
const error = await Promise.race([
|
|
watcher.timeoutOrTerminationPromise(),
|
|
watcher.lifecyclePromise(),
|
|
]);
|
|
watcher.dispose();
|
|
if (error) throw error;
|
|
}
|
|
|
|
/**
|
|
* @param {!{url?: string, path?: string, content?: string, type?: string}} options
|
|
* @return {!Promise<!ElementHandle>}
|
|
*/
|
|
async addScriptTag(options: {
|
|
url?: string;
|
|
path?: string;
|
|
content?: string;
|
|
type?: string;
|
|
}): Promise<ElementHandle> {
|
|
const { url = null, path = null, content = null, type = '' } = options;
|
|
if (url !== null) {
|
|
try {
|
|
const context = await this.executionContext();
|
|
return (
|
|
await context.evaluateHandle(addScriptUrl, url, type)
|
|
).asElement();
|
|
} catch (error) {
|
|
throw new Error(`Loading script from ${url} failed`);
|
|
}
|
|
}
|
|
|
|
if (path !== null) {
|
|
let contents = await readFileAsync(path, 'utf8');
|
|
contents += '//# sourceURL=' + path.replace(/\n/g, '');
|
|
const context = await this.executionContext();
|
|
return (
|
|
await context.evaluateHandle(addScriptContent, contents, type)
|
|
).asElement();
|
|
}
|
|
|
|
if (content !== null) {
|
|
const context = await this.executionContext();
|
|
return (
|
|
await context.evaluateHandle(addScriptContent, content, type)
|
|
).asElement();
|
|
}
|
|
|
|
throw new Error(
|
|
'Provide an object with a `url`, `path` or `content` property'
|
|
);
|
|
|
|
async function addScriptUrl(
|
|
url: string,
|
|
type: string
|
|
): Promise<HTMLElement> {
|
|
const script = document.createElement('script');
|
|
script.src = url;
|
|
if (type) script.type = type;
|
|
const promise = new Promise((res, rej) => {
|
|
script.onload = res;
|
|
script.onerror = rej;
|
|
});
|
|
document.head.appendChild(script);
|
|
await promise;
|
|
return script;
|
|
}
|
|
|
|
function addScriptContent(
|
|
content: string,
|
|
type = 'text/javascript'
|
|
): HTMLElement {
|
|
const script = document.createElement('script');
|
|
script.type = type;
|
|
script.text = content;
|
|
let error = null;
|
|
script.onerror = (e) => (error = e);
|
|
document.head.appendChild(script);
|
|
if (error) throw error;
|
|
return script;
|
|
}
|
|
}
|
|
|
|
async addStyleTag(options: {
|
|
url?: string;
|
|
path?: string;
|
|
content?: string;
|
|
}): Promise<ElementHandle> {
|
|
const { url = null, path = null, content = null } = options;
|
|
if (url !== null) {
|
|
try {
|
|
const context = await this.executionContext();
|
|
return (await context.evaluateHandle(addStyleUrl, url)).asElement();
|
|
} catch (error) {
|
|
throw new Error(`Loading style from ${url} failed`);
|
|
}
|
|
}
|
|
|
|
if (path !== null) {
|
|
let contents = await readFileAsync(path, 'utf8');
|
|
contents += '/*# sourceURL=' + path.replace(/\n/g, '') + '*/';
|
|
const context = await this.executionContext();
|
|
return (
|
|
await context.evaluateHandle(addStyleContent, contents)
|
|
).asElement();
|
|
}
|
|
|
|
if (content !== null) {
|
|
const context = await this.executionContext();
|
|
return (
|
|
await context.evaluateHandle(addStyleContent, content)
|
|
).asElement();
|
|
}
|
|
|
|
throw new Error(
|
|
'Provide an object with a `url`, `path` or `content` property'
|
|
);
|
|
|
|
async function addStyleUrl(url: string): Promise<HTMLElement> {
|
|
const link = document.createElement('link');
|
|
link.rel = 'stylesheet';
|
|
link.href = url;
|
|
const promise = new Promise((res, rej) => {
|
|
link.onload = res;
|
|
link.onerror = rej;
|
|
});
|
|
document.head.appendChild(link);
|
|
await promise;
|
|
return link;
|
|
}
|
|
|
|
async function addStyleContent(content: string): Promise<HTMLElement> {
|
|
const style = document.createElement('style');
|
|
style.type = 'text/css';
|
|
style.appendChild(document.createTextNode(content));
|
|
const promise = new Promise((res, rej) => {
|
|
style.onload = res;
|
|
style.onerror = rej;
|
|
});
|
|
document.head.appendChild(style);
|
|
await promise;
|
|
return style;
|
|
}
|
|
}
|
|
|
|
async click(
|
|
selector: string,
|
|
options: { delay?: number; button?: MouseButtonInput; clickCount?: number }
|
|
): Promise<void> {
|
|
const handle = await this.$(selector);
|
|
assert(handle, 'No node found for selector: ' + selector);
|
|
await handle.click(options);
|
|
await handle.dispose();
|
|
}
|
|
|
|
async focus(selector: string): Promise<void> {
|
|
const handle = await this.$(selector);
|
|
assert(handle, 'No node found for selector: ' + selector);
|
|
await handle.focus();
|
|
await handle.dispose();
|
|
}
|
|
|
|
async hover(selector: string): Promise<void> {
|
|
const handle = await this.$(selector);
|
|
assert(handle, 'No node found for selector: ' + selector);
|
|
await handle.hover();
|
|
await handle.dispose();
|
|
}
|
|
|
|
async select(selector: string, ...values: string[]): Promise<string[]> {
|
|
const handle = await this.$(selector);
|
|
assert(handle, 'No node found for selector: ' + selector);
|
|
const result = await handle.select(...values);
|
|
await handle.dispose();
|
|
return result;
|
|
}
|
|
|
|
async tap(selector: string): Promise<void> {
|
|
const handle = await this.$(selector);
|
|
assert(handle, 'No node found for selector: ' + selector);
|
|
await handle.tap();
|
|
await handle.dispose();
|
|
}
|
|
|
|
async type(
|
|
selector: string,
|
|
text: string,
|
|
options?: { delay: number }
|
|
): Promise<void> {
|
|
const handle = await this.$(selector);
|
|
assert(handle, 'No node found for selector: ' + selector);
|
|
await handle.type(text, options);
|
|
await handle.dispose();
|
|
}
|
|
|
|
waitForSelector(
|
|
selector: string,
|
|
options: WaitForSelectorOptions
|
|
): Promise<ElementHandle | null> {
|
|
return this._waitForSelectorOrXPath(selector, false, options);
|
|
}
|
|
|
|
waitForXPath(
|
|
xpath: string,
|
|
options: WaitForSelectorOptions
|
|
): Promise<ElementHandle | null> {
|
|
return this._waitForSelectorOrXPath(xpath, true, options);
|
|
}
|
|
|
|
waitForFunction(
|
|
pageFunction: Function | string,
|
|
options: { polling?: string | number; timeout?: number } = {},
|
|
...args: unknown[]
|
|
): Promise<JSHandle> {
|
|
const {
|
|
polling = 'raf',
|
|
timeout = this._timeoutSettings.timeout(),
|
|
} = options;
|
|
return new WaitTask(
|
|
this,
|
|
pageFunction,
|
|
undefined,
|
|
'function',
|
|
polling,
|
|
timeout,
|
|
...args
|
|
).promise;
|
|
}
|
|
|
|
async title(): Promise<string> {
|
|
return this.evaluate(() => document.title);
|
|
}
|
|
|
|
private async _waitForSelectorOrXPath(
|
|
selectorOrXPath: string,
|
|
isXPath: boolean,
|
|
options: WaitForSelectorOptions = {}
|
|
): Promise<ElementHandle | null> {
|
|
const {
|
|
visible: waitForVisible = false,
|
|
hidden: waitForHidden = false,
|
|
timeout = this._timeoutSettings.timeout(),
|
|
} = options;
|
|
const polling = waitForVisible || waitForHidden ? 'raf' : 'mutation';
|
|
const title = `${isXPath ? 'XPath' : 'selector'} "${selectorOrXPath}"${
|
|
waitForHidden ? ' to be hidden' : ''
|
|
}`;
|
|
const {
|
|
updatedSelector,
|
|
queryHandler,
|
|
} = getQueryHandlerAndSelector(selectorOrXPath, (element, selector) =>
|
|
document.querySelector(selector)
|
|
);
|
|
const waitTask = new WaitTask(
|
|
this,
|
|
predicate,
|
|
queryHandler,
|
|
title,
|
|
polling,
|
|
timeout,
|
|
updatedSelector,
|
|
isXPath,
|
|
waitForVisible,
|
|
waitForHidden
|
|
);
|
|
const handle = await waitTask.promise;
|
|
if (!handle.asElement()) {
|
|
await handle.dispose();
|
|
return null;
|
|
}
|
|
return handle.asElement();
|
|
|
|
/**
|
|
* @param {string} selectorOrXPath
|
|
* @param {boolean} isXPath
|
|
* @param {boolean} waitForVisible
|
|
* @param {boolean} waitForHidden
|
|
* @return {?Node|boolean}
|
|
*/
|
|
function predicate(
|
|
selectorOrXPath: string,
|
|
isXPath: boolean,
|
|
waitForVisible: boolean,
|
|
waitForHidden: boolean
|
|
): Node | null | boolean {
|
|
const node = isXPath
|
|
? document.evaluate(
|
|
selectorOrXPath,
|
|
document,
|
|
null,
|
|
XPathResult.FIRST_ORDERED_NODE_TYPE,
|
|
null
|
|
).singleNodeValue
|
|
: predicateQueryHandler
|
|
? (predicateQueryHandler(document, selectorOrXPath) as Element)
|
|
: document.querySelector(selectorOrXPath);
|
|
if (!node) return waitForHidden;
|
|
if (!waitForVisible && !waitForHidden) return node;
|
|
const element =
|
|
node.nodeType === Node.TEXT_NODE
|
|
? node.parentElement
|
|
: (node as Element);
|
|
|
|
const style = window.getComputedStyle(element);
|
|
const isVisible =
|
|
style && style.visibility !== 'hidden' && hasVisibleBoundingBox();
|
|
const success =
|
|
waitForVisible === isVisible || waitForHidden === !isVisible;
|
|
return success ? node : null;
|
|
|
|
function hasVisibleBoundingBox(): boolean {
|
|
const rect = element.getBoundingClientRect();
|
|
return !!(rect.top || rect.bottom || rect.width || rect.height);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
class WaitTask {
|
|
_domWorld: DOMWorld;
|
|
_polling: string | number;
|
|
_timeout: number;
|
|
_predicateBody: string;
|
|
_args: unknown[];
|
|
_runCount = 0;
|
|
promise: Promise<JSHandle>;
|
|
_resolve: (x: JSHandle) => void;
|
|
_reject: (x: Error) => void;
|
|
_timeoutTimer?: NodeJS.Timeout;
|
|
_terminated = false;
|
|
|
|
constructor(
|
|
domWorld: DOMWorld,
|
|
predicateBody: Function | string,
|
|
predicateQueryHandlerBody: Function | string | undefined,
|
|
title: string,
|
|
polling: string | number,
|
|
timeout: number,
|
|
...args: unknown[]
|
|
) {
|
|
if (helper.isString(polling))
|
|
assert(
|
|
polling === 'raf' || polling === 'mutation',
|
|
'Unknown polling option: ' + polling
|
|
);
|
|
else if (helper.isNumber(polling))
|
|
assert(polling > 0, 'Cannot poll with non-positive interval: ' + polling);
|
|
else throw new Error('Unknown polling options: ' + polling);
|
|
|
|
function getPredicateBody(
|
|
predicateBody: Function | string,
|
|
predicateQueryHandlerBody: Function | string
|
|
) {
|
|
if (helper.isString(predicateBody)) return `return (${predicateBody});`;
|
|
if (predicateQueryHandlerBody) {
|
|
return `
|
|
return (function wrapper(args) {
|
|
const predicateQueryHandler = ${predicateQueryHandlerBody};
|
|
return (${predicateBody})(...args);
|
|
})(args);`;
|
|
}
|
|
return `return (${predicateBody})(...args);`;
|
|
}
|
|
|
|
this._domWorld = domWorld;
|
|
this._polling = polling;
|
|
this._timeout = timeout;
|
|
this._predicateBody = getPredicateBody(
|
|
predicateBody,
|
|
predicateQueryHandlerBody
|
|
);
|
|
this._args = args;
|
|
this._runCount = 0;
|
|
domWorld._waitTasks.add(this);
|
|
this.promise = new Promise<JSHandle>((resolve, reject) => {
|
|
this._resolve = resolve;
|
|
this._reject = reject;
|
|
});
|
|
// Since page navigation requires us to re-install the pageScript, we should track
|
|
// timeout on our end.
|
|
if (timeout) {
|
|
const timeoutError = new TimeoutError(
|
|
`waiting for ${title} failed: timeout ${timeout}ms exceeded`
|
|
);
|
|
this._timeoutTimer = setTimeout(
|
|
() => this.terminate(timeoutError),
|
|
timeout
|
|
);
|
|
}
|
|
this.rerun();
|
|
}
|
|
|
|
terminate(error: Error): void {
|
|
this._terminated = true;
|
|
this._reject(error);
|
|
this._cleanup();
|
|
}
|
|
|
|
async rerun(): Promise<void> {
|
|
const runCount = ++this._runCount;
|
|
/** @type {?JSHandle} */
|
|
let success = null;
|
|
let error = null;
|
|
try {
|
|
success = await (await this._domWorld.executionContext()).evaluateHandle(
|
|
waitForPredicatePageFunction,
|
|
this._predicateBody,
|
|
this._polling,
|
|
this._timeout,
|
|
...this._args
|
|
);
|
|
} catch (error_) {
|
|
error = error_;
|
|
}
|
|
|
|
if (this._terminated || runCount !== this._runCount) {
|
|
if (success) await success.dispose();
|
|
return;
|
|
}
|
|
|
|
// Ignore timeouts in pageScript - we track timeouts ourselves.
|
|
// If the frame's execution context has already changed, `frame.evaluate` will
|
|
// throw an error - ignore this predicate run altogether.
|
|
if (
|
|
!error &&
|
|
(await this._domWorld.evaluate((s) => !s, success).catch(() => true))
|
|
) {
|
|
await success.dispose();
|
|
return;
|
|
}
|
|
|
|
// When the page is navigated, the promise is rejected.
|
|
// We will try again in the new execution context.
|
|
if (error && error.message.includes('Execution context was destroyed'))
|
|
return;
|
|
|
|
// We could have tried to evaluate in a context which was already
|
|
// destroyed.
|
|
if (
|
|
error &&
|
|
error.message.includes('Cannot find context with specified id')
|
|
)
|
|
return;
|
|
|
|
if (error) this._reject(error);
|
|
else this._resolve(success);
|
|
|
|
this._cleanup();
|
|
}
|
|
|
|
_cleanup(): void {
|
|
clearTimeout(this._timeoutTimer);
|
|
this._domWorld._waitTasks.delete(this);
|
|
}
|
|
}
|
|
|
|
async function waitForPredicatePageFunction(
|
|
predicateBody: string,
|
|
polling: string,
|
|
timeout: number,
|
|
...args: unknown[]
|
|
): Promise<unknown> {
|
|
const predicate = new Function('...args', predicateBody);
|
|
let timedOut = false;
|
|
if (timeout) setTimeout(() => (timedOut = true), timeout);
|
|
if (polling === 'raf') return await pollRaf();
|
|
if (polling === 'mutation') return await pollMutation();
|
|
if (typeof polling === 'number') return await pollInterval(polling);
|
|
|
|
/**
|
|
* @return {!Promise<*>}
|
|
*/
|
|
async function pollMutation(): Promise<unknown> {
|
|
const success = await predicate(...args);
|
|
if (success) return Promise.resolve(success);
|
|
|
|
let fulfill;
|
|
const result = new Promise((x) => (fulfill = x));
|
|
const observer = new MutationObserver(async () => {
|
|
if (timedOut) {
|
|
observer.disconnect();
|
|
fulfill();
|
|
}
|
|
const success = await predicate(...args);
|
|
if (success) {
|
|
observer.disconnect();
|
|
fulfill(success);
|
|
}
|
|
});
|
|
observer.observe(document, {
|
|
childList: true,
|
|
subtree: true,
|
|
attributes: true,
|
|
});
|
|
return result;
|
|
}
|
|
|
|
async function pollRaf(): Promise<unknown> {
|
|
let fulfill;
|
|
const result = new Promise((x) => (fulfill = x));
|
|
await onRaf();
|
|
return result;
|
|
|
|
async function onRaf(): Promise<unknown> {
|
|
if (timedOut) {
|
|
fulfill();
|
|
return;
|
|
}
|
|
const success = await predicate(...args);
|
|
if (success) fulfill(success);
|
|
else requestAnimationFrame(onRaf);
|
|
}
|
|
}
|
|
|
|
async function pollInterval(pollInterval: number): Promise<unknown> {
|
|
let fulfill;
|
|
const result = new Promise((x) => (fulfill = x));
|
|
await onTimeout();
|
|
return result;
|
|
|
|
async function onTimeout(): Promise<unknown> {
|
|
if (timedOut) {
|
|
fulfill();
|
|
return;
|
|
}
|
|
const success = await predicate(...args);
|
|
if (success) fulfill(success);
|
|
else setTimeout(onTimeout, pollInterval);
|
|
}
|
|
}
|
|
}
|