mirror of
https://github.com/puppeteer/puppeteer
synced 2024-06-14 14:02:48 +00:00
6474edb9ba
This pulls in the types (based on the DefinitelyTyped repo) for `page.$eval` (and the `$eval` method on other classes). The `$eval` method is quite hard to type due to the way we wrap and unwrap ElementHandles that are passed to / returned from the `pageFunction` that users provide. Longer term we can improve the types by providing type overloads as DefinitelyTyped does but I've deferred that for now (see the `TODO` in the code for more details).
860 lines
25 KiB
JavaScript
860 lines
25 KiB
JavaScript
/**
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* Copyright 2017 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const jsBuilder = require('./JSBuilder');
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const mdBuilder = require('./MDBuilder');
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const Documentation = require('./Documentation');
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const Message = require('../Message');
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const EXCLUDE_PROPERTIES = new Set([
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'Browser.create',
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'Headers.fromPayload',
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'Page.create',
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'JSHandle.toString',
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'TimeoutError.name',
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/* This isn't an actual property, but a TypeScript generic.
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* DocLint incorrectly parses it as a property.
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*/
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'ElementHandle.ElementType',
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]);
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/**
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* @param {!Page} page
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* @param {!Array<!Source>} mdSources
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* @returns {!Promise<!Array<!Message>>}
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*/
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module.exports = async function lint(page, mdSources, jsSources) {
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const mdResult = await mdBuilder(page, mdSources);
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const jsResult = await jsBuilder(jsSources);
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const jsDocumentation = filterJSDocumentation(
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jsSources,
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jsResult.documentation
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);
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const mdDocumentation = mdResult.documentation;
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const jsErrors = jsResult.errors;
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jsErrors.push(...checkDuplicates(jsDocumentation));
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const mdErrors = mdResult.errors;
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mdErrors.push(...compareDocumentations(mdDocumentation, jsDocumentation));
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mdErrors.push(...checkDuplicates(mdDocumentation));
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mdErrors.push(...checkSorting(mdDocumentation));
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// Push all errors with proper prefixes
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const errors = jsErrors.map((error) => '[JavaScript] ' + error);
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errors.push(...mdErrors.map((error) => '[MarkDown] ' + error));
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return errors.map((error) => Message.error(error));
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};
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/**
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* @param {!Documentation} doc
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* @returns {!Array<string>}
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*/
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function checkSorting(doc) {
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const errors = [];
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for (const cls of doc.classesArray) {
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const members = cls.membersArray;
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// Events should go first.
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let eventIndex = 0;
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for (
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;
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eventIndex < members.length && members[eventIndex].kind === 'event';
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++eventIndex
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);
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for (
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;
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eventIndex < members.length && members[eventIndex].kind !== 'event';
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++eventIndex
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);
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if (eventIndex < members.length)
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errors.push(
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`Events should go first. Event '${members[eventIndex].name}' in class ${cls.name} breaks order`
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);
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// Constructor should be right after events and before all other members.
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const constructorIndex = members.findIndex(
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(member) => member.kind === 'method' && member.name === 'constructor'
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);
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if (constructorIndex > 0 && members[constructorIndex - 1].kind !== 'event')
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errors.push(`Constructor of ${cls.name} should go before other methods`);
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// Events should be sorted alphabetically.
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for (let i = 0; i < members.length - 1; ++i) {
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const member1 = cls.membersArray[i];
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const member2 = cls.membersArray[i + 1];
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if (member1.kind !== 'event' || member2.kind !== 'event') continue;
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if (member1.name > member2.name)
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errors.push(
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`Event '${member1.name}' in class ${cls.name} breaks alphabetic ordering of events`
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);
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}
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// All other members should be sorted alphabetically.
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for (let i = 0; i < members.length - 1; ++i) {
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const member1 = cls.membersArray[i];
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const member2 = cls.membersArray[i + 1];
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if (member1.kind === 'event' || member2.kind === 'event') continue;
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if (member1.kind === 'method' && member1.name === 'constructor') continue;
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if (member1.name > member2.name) {
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let memberName1 = `${cls.name}.${member1.name}`;
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if (member1.kind === 'method') memberName1 += '()';
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let memberName2 = `${cls.name}.${member2.name}`;
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if (member2.kind === 'method') memberName2 += '()';
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errors.push(
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`Bad alphabetic ordering of ${cls.name} members: ${memberName1} should go after ${memberName2}`
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);
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}
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}
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}
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return errors;
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}
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/**
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* @param {!Array<!Source>} jsSources
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* @param {!Documentation} jsDocumentation
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* @returns {!Documentation}
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*/
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function filterJSDocumentation(jsSources, jsDocumentation) {
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const apijs = jsSources.find((source) => source.name() === 'api.js');
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let includedClasses = null;
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if (apijs) includedClasses = new Set(Object.keys(require(apijs.filePath())));
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// Filter private classes and methods.
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const classes = [];
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for (const cls of jsDocumentation.classesArray) {
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if (includedClasses && !includedClasses.has(cls.name)) continue;
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const members = cls.membersArray.filter(
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(member) => !EXCLUDE_PROPERTIES.has(`${cls.name}.${member.name}`)
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);
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classes.push(new Documentation.Class(cls.name, members));
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}
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return new Documentation(classes);
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}
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/**
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* @param {!Documentation} doc
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* @returns {!Array<string>}
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*/
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function checkDuplicates(doc) {
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const errors = [];
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const classes = new Set();
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// Report duplicates.
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for (const cls of doc.classesArray) {
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if (classes.has(cls.name))
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errors.push(`Duplicate declaration of class ${cls.name}`);
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classes.add(cls.name);
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const members = new Set();
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for (const member of cls.membersArray) {
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if (members.has(member.kind + ' ' + member.name))
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errors.push(
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`Duplicate declaration of ${member.kind} ${cls.name}.${member.name}()`
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);
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members.add(member.kind + ' ' + member.name);
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const args = new Set();
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for (const arg of member.argsArray) {
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if (args.has(arg.name))
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errors.push(
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`Duplicate declaration of argument ${cls.name}.${member.name} "${arg.name}"`
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);
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args.add(arg.name);
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}
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}
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}
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return errors;
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}
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// All the methods from our EventEmitter that we don't document for each subclass.
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const EVENT_LISTENER_METHODS = new Set([
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'emit',
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'listenerCount',
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'off',
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'on',
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'once',
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'removeListener',
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'addListener',
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'removeAllListeners',
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]);
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/* Methods that are defined in code but are not documented */
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const expectedNotFoundMethods = new Map([
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['Browser', EVENT_LISTENER_METHODS],
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['BrowserContext', EVENT_LISTENER_METHODS],
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['CDPSession', EVENT_LISTENER_METHODS],
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['Page', EVENT_LISTENER_METHODS],
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['WebWorker', EVENT_LISTENER_METHODS],
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]);
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/**
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* @param {!Documentation} actual
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* @param {!Documentation} expected
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* @returns {!Array<string>}
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*/
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function compareDocumentations(actual, expected) {
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const errors = [];
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const actualClasses = Array.from(actual.classes.keys()).sort();
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const expectedClasses = Array.from(expected.classes.keys()).sort();
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const classesDiff = diff(actualClasses, expectedClasses);
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for (const className of classesDiff.extra)
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errors.push(`Non-existing class found: ${className}`);
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for (const className of classesDiff.missing)
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errors.push(`Class not found: ${className}`);
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for (const className of classesDiff.equal) {
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const actualClass = actual.classes.get(className);
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const expectedClass = expected.classes.get(className);
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const actualMethods = Array.from(actualClass.methods.keys()).sort();
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const expectedMethods = Array.from(expectedClass.methods.keys()).sort();
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const methodDiff = diff(actualMethods, expectedMethods);
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for (const methodName of methodDiff.extra) {
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errors.push(`Non-existing method found: ${className}.${methodName}()`);
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}
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for (const methodName of methodDiff.missing) {
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const missingMethodsForClass = expectedNotFoundMethods.get(className);
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if (missingMethodsForClass && missingMethodsForClass.has(methodName))
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continue;
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errors.push(`Method not found: ${className}.${methodName}()`);
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}
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for (const methodName of methodDiff.equal) {
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const actualMethod = actualClass.methods.get(methodName);
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const expectedMethod = expectedClass.methods.get(methodName);
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if (!actualMethod.type !== !expectedMethod.type) {
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if (actualMethod.type)
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errors.push(
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`Method ${className}.${methodName} has unneeded description of return type`
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);
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else
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errors.push(
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`Method ${className}.${methodName} is missing return type description`
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);
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} else if (actualMethod.hasReturn) {
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checkType(
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`Method ${className}.${methodName} has the wrong return type: `,
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actualMethod.type,
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expectedMethod.type
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);
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}
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const actualArgs = Array.from(actualMethod.args.keys());
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const expectedArgs = Array.from(expectedMethod.args.keys());
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const argsDiff = diff(actualArgs, expectedArgs);
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if (argsDiff.extra.length || argsDiff.missing.length) {
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const text = [
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`Method ${className}.${methodName}() fails to describe its parameters:`,
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];
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for (const arg of argsDiff.missing)
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text.push(`- Argument not found: ${arg}`);
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for (const arg of argsDiff.extra)
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text.push(`- Non-existing argument found: ${arg}`);
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errors.push(text.join('\n'));
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}
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for (const arg of argsDiff.equal)
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checkProperty(
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`Method ${className}.${methodName}()`,
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actualMethod.args.get(arg),
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expectedMethod.args.get(arg)
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);
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}
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const actualProperties = Array.from(actualClass.properties.keys()).sort();
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const expectedProperties = Array.from(
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expectedClass.properties.keys()
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).sort();
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const propertyDiff = diff(actualProperties, expectedProperties);
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for (const propertyName of propertyDiff.extra)
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errors.push(`Non-existing property found: ${className}.${propertyName}`);
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for (const propertyName of propertyDiff.missing)
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errors.push(`Property not found: ${className}.${propertyName}`);
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const actualEvents = Array.from(actualClass.events.keys()).sort();
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const expectedEvents = Array.from(expectedClass.events.keys()).sort();
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const eventsDiff = diff(actualEvents, expectedEvents);
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for (const eventName of eventsDiff.extra)
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errors.push(
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`Non-existing event found in class ${className}: '${eventName}'`
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);
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for (const eventName of eventsDiff.missing)
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errors.push(`Event not found in class ${className}: '${eventName}'`);
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}
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/**
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* @param {string} source
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* @param {!Documentation.Member} actual
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* @param {!Documentation.Member} expected
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*/
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function checkProperty(source, actual, expected) {
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checkType(source + ' ' + actual.name, actual.type, expected.type);
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}
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/**
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* @param {string} source
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* @param {!string} actualName
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* @param {!string} expectedName
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*/
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function namingMisMatchInTypeIsExpected(source, actualName, expectedName) {
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/* The DocLint tooling doesn't deal well with generics in TypeScript
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* source files. We could fix this but the longterm plan is to
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* auto-generate documentation from TS. So instead we document here
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* the methods that use generics that DocLint trips up on and if it
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* finds a mismatch that matches one of the cases below it doesn't
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* error. This still means we're protected from accidental changes, as
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* if the mismatch doesn't exactly match what's described below
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* DocLint will fail.
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*/
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const expectedNamingMismatches = new Map([
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[
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'Method CDPSession.send() method',
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{
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actualName: 'string',
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expectedName: 'T',
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},
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],
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[
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'Method CDPSession.send() params',
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{
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actualName: 'Object',
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expectedName: 'CommandParameters[T]',
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},
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],
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[
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'Method ElementHandle.click() options',
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{
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actualName: 'Object',
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expectedName: 'ClickOptions',
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},
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],
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[
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'Method ElementHandle.press() options',
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{
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actualName: 'Object',
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expectedName: 'PressOptions',
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},
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],
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[
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'Method ElementHandle.press() key',
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{
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actualName: 'string',
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expectedName: 'KeyInput',
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},
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],
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[
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'Method Keyboard.down() key',
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{
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actualName: 'string',
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expectedName: 'KeyInput',
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},
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],
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[
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'Method Keyboard.press() key',
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{
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actualName: 'string',
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expectedName: 'KeyInput',
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},
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],
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[
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'Method Keyboard.up() key',
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{
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actualName: 'string',
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expectedName: 'KeyInput',
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},
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],
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[
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'Method Mouse.down() options',
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{
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actualName: 'Object',
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expectedName: 'MouseOptions',
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},
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],
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[
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'Method Mouse.up() options',
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{
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actualName: 'Object',
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expectedName: 'MouseOptions',
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},
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],
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[
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'Method Tracing.start() options',
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{
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actualName: 'Object',
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expectedName: 'TracingOptions',
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},
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],
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[
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'Method Frame.waitForSelector() options',
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{
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actualName: 'Object',
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expectedName: 'WaitForSelectorOptions',
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},
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],
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[
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'Method Frame.waitForXPath() options',
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{
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actualName: 'Object',
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expectedName: 'WaitForSelectorOptions',
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},
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],
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[
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'Method HTTPRequest.abort() errorCode',
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{
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actualName: 'string',
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expectedName: 'ErrorCode',
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},
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],
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[
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'Method Frame.goto() options.waitUntil',
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{
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actualName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
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expectedName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
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},
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],
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[
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'Method Frame.waitForNavigation() options.waitUntil',
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{
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actualName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
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expectedName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
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},
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],
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[
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'Method Frame.setContent() options.waitUntil',
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{
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actualName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
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expectedName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
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},
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],
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[
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'Method Puppeteer.defaultArgs() options',
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{
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actualName: 'Object',
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expectedName: 'ChromeArgOptions',
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},
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],
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[
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'Method Page.goBack() options.waitUntil',
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{
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actualName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
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expectedName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
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},
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],
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[
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'Method Page.goForward() options.waitUntil',
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{
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actualName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
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expectedName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
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},
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],
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[
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'Method Page.goto() options.waitUntil',
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{
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actualName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
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expectedName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
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},
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],
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[
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'Method Page.reload() options.waitUntil',
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{
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actualName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
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expectedName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
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},
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],
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[
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'Method Page.setContent() options.waitUntil',
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{
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actualName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
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expectedName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
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},
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],
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[
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'Method Page.waitForNavigation() options.waitUntil',
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{
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actualName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array',
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expectedName:
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'"load"|"domcontentloaded"|"networkidle0"|"networkidle2"|Array<PuppeteerLifeCycleEvent>',
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},
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],
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[
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'Method BrowserContext.overridePermissions() permissions',
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{
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actualName: 'Array<string>',
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expectedName: 'Array<PermissionType>',
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},
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],
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[
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'Method Puppeteer.createBrowserFetcher() options',
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{
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actualName: 'Object',
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expectedName: 'BrowserFetcherOptions',
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},
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],
|
|
[
|
|
'Method Page.authenticate() credentials',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'Credentials',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.emulateMediaFeatures() features',
|
|
{
|
|
actualName: 'Array<Object>',
|
|
expectedName: 'Array<MediaFeature>',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.emulate() options.viewport',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'Viewport',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.setViewport() options.viewport',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'Viewport',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.setViewport() viewport',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'Viewport',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.connect() options.defaultViewport',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'Viewport',
|
|
},
|
|
],
|
|
[
|
|
'Method Puppeteer.connect() options.defaultViewport',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'Viewport',
|
|
},
|
|
],
|
|
[
|
|
'Method Puppeteer.launch() options.defaultViewport',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'Viewport',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.launch() options.defaultViewport',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'Viewport',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.goBack() options',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'WaitForOptions',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.goForward() options',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'WaitForOptions',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.reload() options',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'WaitForOptions',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.waitForNavigation() options',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'WaitForOptions',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.pdf() options',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'PDFOptions',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.screenshot() options',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'ScreenshotOptions',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.setContent() options',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'WaitForOptions',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.setCookie() ...cookies',
|
|
{
|
|
actualName: '...Object',
|
|
expectedName: '...CookieParam',
|
|
},
|
|
],
|
|
[
|
|
'Method Page.emulateVisionDeficiency() type',
|
|
{
|
|
actualName: 'string',
|
|
expectedName: 'VisionDeficiency',
|
|
},
|
|
],
|
|
[
|
|
'Method Accessibility.snapshot() options',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'SnapshotOptions',
|
|
},
|
|
],
|
|
[
|
|
'Method Browser.waitForTarget() options',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'WaitForTargetOptions',
|
|
},
|
|
],
|
|
[
|
|
'Method EventEmitter.emit() event',
|
|
{
|
|
actualName: 'string|symbol',
|
|
expectedName: 'Object',
|
|
},
|
|
],
|
|
[
|
|
'Method EventEmitter.listenerCount() event',
|
|
{
|
|
actualName: 'string|symbol',
|
|
expectedName: 'Object',
|
|
},
|
|
],
|
|
[
|
|
'Method EventEmitter.off() event',
|
|
{
|
|
actualName: 'string|symbol',
|
|
expectedName: 'Object',
|
|
},
|
|
],
|
|
[
|
|
'Method EventEmitter.on() event',
|
|
{
|
|
actualName: 'string|symbol',
|
|
expectedName: 'Object',
|
|
},
|
|
],
|
|
[
|
|
'Method EventEmitter.once() event',
|
|
{
|
|
actualName: 'string|symbol',
|
|
expectedName: 'Object',
|
|
},
|
|
],
|
|
[
|
|
'Method EventEmitter.removeListener() event',
|
|
{
|
|
actualName: 'string|symbol',
|
|
expectedName: 'Object',
|
|
},
|
|
],
|
|
[
|
|
'Method EventEmitter.addListener() event',
|
|
{
|
|
actualName: 'string|symbol',
|
|
expectedName: 'Object',
|
|
},
|
|
],
|
|
[
|
|
'Method EventEmitter.removeAllListeners() event',
|
|
{
|
|
actualName: 'string|symbol',
|
|
expectedName: 'Object',
|
|
},
|
|
],
|
|
[
|
|
'Method Coverage.startCSSCoverage() options',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'CSSCoverageOptions',
|
|
},
|
|
],
|
|
[
|
|
'Method Coverage.startJSCoverage() options',
|
|
{
|
|
actualName: 'Object',
|
|
expectedName: 'JSCoverageOptions',
|
|
},
|
|
],
|
|
]);
|
|
|
|
const expectedForSource = expectedNamingMismatches.get(source);
|
|
if (!expectedForSource) return false;
|
|
|
|
const namingMismatchIsExpected =
|
|
expectedForSource.actualName === actualName &&
|
|
expectedForSource.expectedName === expectedName;
|
|
|
|
return namingMismatchIsExpected;
|
|
}
|
|
|
|
/**
|
|
* @param {string} source
|
|
* @param {!Documentation.Type} actual
|
|
* @param {!Documentation.Type} expected
|
|
*/
|
|
function checkType(source, actual, expected) {
|
|
// TODO(@JoelEinbinder): check functions and Serializable
|
|
if (actual.name.includes('unction') || actual.name.includes('Serializable'))
|
|
return;
|
|
// We don't have nullchecks on for TypeScript
|
|
const actualName = actual.name.replace(/[\? ]/g, '');
|
|
// TypeScript likes to add some spaces
|
|
const expectedName = expected.name.replace(/\ /g, '');
|
|
const namingMismatchIsExpected = namingMisMatchInTypeIsExpected(
|
|
source,
|
|
actualName,
|
|
expectedName
|
|
);
|
|
if (expectedName !== actualName && !namingMismatchIsExpected)
|
|
errors.push(`${source} ${actualName} != ${expectedName}`);
|
|
|
|
/* If we got a naming mismatch and it was expected, don't check the properties
|
|
* as they will likely be considered "wrong" by DocLint too.
|
|
*/
|
|
if (namingMismatchIsExpected) return;
|
|
const actualPropertiesMap = new Map(
|
|
actual.properties.map((property) => [property.name, property.type])
|
|
);
|
|
const expectedPropertiesMap = new Map(
|
|
expected.properties.map((property) => [property.name, property.type])
|
|
);
|
|
const propertiesDiff = diff(
|
|
Array.from(actualPropertiesMap.keys()).sort(),
|
|
Array.from(expectedPropertiesMap.keys()).sort()
|
|
);
|
|
for (const propertyName of propertiesDiff.extra)
|
|
errors.push(`${source} has unexpected property ${propertyName}`);
|
|
for (const propertyName of propertiesDiff.missing)
|
|
errors.push(`${source} is missing property ${propertyName}`);
|
|
for (const propertyName of propertiesDiff.equal)
|
|
checkType(
|
|
source + '.' + propertyName,
|
|
actualPropertiesMap.get(propertyName),
|
|
expectedPropertiesMap.get(propertyName)
|
|
);
|
|
}
|
|
|
|
return errors;
|
|
}
|
|
|
|
/**
|
|
* @param {!Array<string>} actual
|
|
* @param {!Array<string>} expected
|
|
* @returns {{extra: !Array<string>, missing: !Array<string>, equal: !Array<string>}}
|
|
*/
|
|
function diff(actual, expected) {
|
|
const N = actual.length;
|
|
const M = expected.length;
|
|
if (N === 0 && M === 0) return { extra: [], missing: [], equal: [] };
|
|
if (N === 0) return { extra: [], missing: expected.slice(), equal: [] };
|
|
if (M === 0) return { extra: actual.slice(), missing: [], equal: [] };
|
|
const d = new Array(N);
|
|
const bt = new Array(N);
|
|
for (let i = 0; i < N; ++i) {
|
|
d[i] = new Array(M);
|
|
bt[i] = new Array(M);
|
|
for (let j = 0; j < M; ++j) {
|
|
const top = val(i - 1, j);
|
|
const left = val(i, j - 1);
|
|
if (top > left) {
|
|
d[i][j] = top;
|
|
bt[i][j] = 'extra';
|
|
} else {
|
|
d[i][j] = left;
|
|
bt[i][j] = 'missing';
|
|
}
|
|
const diag = val(i - 1, j - 1);
|
|
if (actual[i] === expected[j] && d[i][j] < diag + 1) {
|
|
d[i][j] = diag + 1;
|
|
bt[i][j] = 'eq';
|
|
}
|
|
}
|
|
}
|
|
// Backtrack results.
|
|
let i = N - 1;
|
|
let j = M - 1;
|
|
const missing = [];
|
|
const extra = [];
|
|
const equal = [];
|
|
while (i >= 0 && j >= 0) {
|
|
switch (bt[i][j]) {
|
|
case 'extra':
|
|
extra.push(actual[i]);
|
|
i -= 1;
|
|
break;
|
|
case 'missing':
|
|
missing.push(expected[j]);
|
|
j -= 1;
|
|
break;
|
|
case 'eq':
|
|
equal.push(actual[i]);
|
|
i -= 1;
|
|
j -= 1;
|
|
break;
|
|
}
|
|
}
|
|
while (i >= 0) extra.push(actual[i--]);
|
|
while (j >= 0) missing.push(expected[j--]);
|
|
extra.reverse();
|
|
missing.reverse();
|
|
equal.reverse();
|
|
return { extra, missing, equal };
|
|
|
|
function val(i, j) {
|
|
return i < 0 || j < 0 ? 0 : d[i][j];
|
|
}
|
|
}
|