mirror of
https://github.com/gorhill/uBlock.git
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b27f23d520
Upon start-up, uBlock runs all content scripts in manifest.json using `chrome.tabs.executeScript`. When this API is used, the value of the last expression is automatically cloned and transferred to the callback of `chrome.tabs.executeScript`. This is convenient if needed, and a performance burden otherwise (the latter is the case for uBlock). There are three content scripts that need to be checked: - vapi.js The last expression is often the vAPI object, and it is relatively expensive to clone this object. This commit sets the value of the last expression to `void 0` to solve this inefficiency. - vapi-client.js No action needed yet; The last expression is `vAPI.shutdown.add(...)`, which has a void return value. - contentscript.js No action needed yet; The last expression is an immediately-invoked function expression without return value.
61 lines
2.2 KiB
JavaScript
61 lines
2.2 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2017 The uBlock Origin authors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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'use strict';
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/* global HTMLDocument, XMLDocument */
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// For background page, auxiliary pages, and content scripts.
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/******************************************************************************/
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// https://bugzilla.mozilla.org/show_bug.cgi?id=1408996#c9
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var vAPI = window.vAPI; // jshint ignore:line
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// https://github.com/chrisaljoudi/uBlock/issues/464
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// https://github.com/chrisaljoudi/uBlock/issues/1528
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// A XMLDocument can be a valid HTML document.
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// https://github.com/gorhill/uBlock/issues/1124
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// Looks like `contentType` is on track to be standardized:
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// https://dom.spec.whatwg.org/#concept-document-content-type
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// https://forums.lanik.us/viewtopic.php?f=64&t=31522
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// Skip text/plain documents.
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if (
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(document instanceof HTMLDocument ||
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document instanceof XMLDocument &&
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document.createElement('div') instanceof HTMLDivElement
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) &&
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(/^image\/|^text\/plain/.test(document.contentType || '') === false)
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) {
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vAPI = window.vAPI = vAPI instanceof Object && vAPI.uBO === true
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? vAPI
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: { uBO: true };
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}
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// Set the value of the last expression to undefined to avoid serializing the
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// vAPI object when the content script is run using chrome.tabs.executeScript.
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void 0;
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/******************************************************************************/
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