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class="col docItemCol_VOVn"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is unreleased documentation for <!-- -->Puppeteer<!-- --> <b>Next</b> version.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/contributing">latest version</a></b> (<!-- -->21.3.8<!-- -->).</div></div><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Contributing</span><meta itemprop="position" content="1"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Next</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Contributing</h1><p>First of all, thank you for your interest in Puppeteer! We&#x27;d love to accept your
patches and contributions!</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="contributor-license-agreement">Contributor License Agreement<a href="#contributor-license-agreement" class="hash-link" aria-label="Direct link to Contributor License Agreement" title="Direct link to Contributor License Agreement">​</a></h2><p>Contributions to this project must be accompanied by a Contributor License
Agreement. You (or your employer) retain the copyright to your contribution,
this simply gives us permission to use and redistribute your contributions as
part of the project. Head over to <a href="https://cla.developers.google.com/" target="_blank" rel="noopener noreferrer">https://cla.developers.google.com/</a> to see
your current agreements on file or to sign a new one.</p><p>You generally only need to submit a CLA once, so if you&#x27;ve already submitted one
(even if it was for a different project), you probably don&#x27;t need to do it
again.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="getting-started">Getting started<a href="#getting-started" class="hash-link" aria-label="Direct link to Getting started" title="Direct link to Getting started">​</a></h2><ol><li><p>Clone this repository</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">git</span><span class="token plain"> clone https://github.com/puppeteer/puppeteer</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token builtin class-name">cd</span><span class="token plain"> puppeteer</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>or</p><p><a href="https://github.com/codespaces/new?hide_repo_select=true&amp;ref=main&amp;repo=90796663&amp;machine=standardLinux32gb&amp;devcontainer_path=.devcontainer%2Fdevcontainer.json" target="_blank" rel="noopener noreferrer"><img loading="lazy" src="https://github.com/codespaces/badge.svg" alt="Open in GitHub Codespaces" class="img_ev3q"></a></p></li><li><p>Install the dependencies</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">install</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># Or to download Firefox</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token assign-left variable" style="color:#36acaa">PUPPETEER_PRODUCT</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">firefox </span><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">install</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li><li><p>Build all packages</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> run build</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li><li><p>Run all tests</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> </span><span class="token builtin class-name">test</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li></ol><h2 class="anchor anchorWithStickyNavbar_LWe7" id="building-a-single-package">Building a single package<a href="#building-a-single-package" class="hash-link" aria-label="Direct link to Building a single package" title="Direct link to Building a single package">​</a></h2><p>To build a single package, you can run:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> run build --workspace </span><span class="token operator" style="color:#393A34">&lt;</span><span class="token plain">package</span><span class="token operator" style="color:#393A34">&gt;</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># e.g. puppeteer</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>This will build all dependent packages automatically, so specifying a single
packages is sufficient. This is all possible due to
<a href="https://github.com/google/wireit" target="_blank" rel="noopener noreferrer">wireit</a> which behaves similar to
<a href="https://www.gnu.org/software/make/" target="_blank" rel="noopener noreferrer">GNU Make</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="watch-mode">Watch mode<a href="#watch-mode" class="hash-link" aria-label="Direct link to Watch mode" title="Direct link to Watch mode">​</a></h3><p>To continuously build a package, you can run:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> run build --watch --workspace </span><span class="token operator" style="color:#393A34">&lt;</span><span class="token plain">package</span><span class="token operator" style="color:#393A34">&gt;</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic"># e.g. puppeteer</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>You have to only specify a single package to watch else things will not work as expected
As stated above because of <a href="https://github.com/google/wireit" target="_blank" rel="noopener noreferrer">wireit</a> when a change happens
all dependencies will be build or rebuild (if needed).</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="removing-stale-artifacts">Removing stale artifacts<a href="#removing-stale-artifacts" class="hash-link" aria-label="Direct link to Removing stale artifacts" title="Direct link to Removing stale artifacts">​</a></h2><p>It&#x27;s possible some generated artifacts (such as
<code>packages/puppeteer-core/src/types.ts</code>) can become stale since these artifacts
rely on complex conditions (such as names of distinct files) that cannot be
captured by the build system. To clean artifacts, you can run</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> run clean</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token comment" style="color:#999988;font-style:italic"># or specify the package</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> run clean --workspace </span><span class="token operator" style="color:#393A34">&lt;</span><span class="token plain">package</span><span class="token operator" style="color:#393A34">&gt;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="comprehensive-testing">Comprehensive testing<a href="#comprehensive-testing" class="hash-link" aria-label="Direct link to Comprehensive testing" title="Direct link to Comprehensive testing">​</a></h2><p>Outside of <code>npm test</code>, there are several other
<a href="https://docs.npmjs.com/cli/using-npm/scripts" target="_blank" rel="noopener noreferrer"><code>npm</code> scripts</a> that are
usually check through CI:</p><ul><li><code>test-install</code> - Tests whether <code>puppeteer</code> and <code>puppeteer-core</code> install
properly and are functional.</li><li><code>test-types</code> - Tests the TypeScript types in <code>puppeteer</code> using
<a href="https://github.com/SamVerschueren/tsd" target="_blank" rel="noopener noreferrer"><code>tsd</code></a>.</li><li><code>test:chrome:**</code> - Tests <code>puppeteer</code> on Chromium.</li><li><code>test:firefox:**</code> - Tests <code>puppeteer</code> on Firefox.</li><li><code>unit</code> - Runs unit tests.</li></ul><p>The default <code>npm test</code> runs <code>test:{chrome,firefox}:headless</code> which is generally
sufficient.</p><p>Puppeteer uses a custom test runner on top of Mocha that consults the
<a href="https://github.com/puppeteer/puppeteer/blob/main/test/TestExpectations.json" target="_blank" rel="noopener noreferrer">TestExpectations.json</a>
to see if a given test result is expected or not. See more info about the test
runner in
<a href="https://github.com/puppeteer/puppeteer/tree/main/tools/mocha-runner" target="_blank" rel="noopener noreferrer"><code>tools/mocha-runner</code></a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="unit-tests">Unit tests<a href="#unit-tests" class="hash-link" aria-label="Direct link to Unit tests" title="Direct link to Unit tests">​</a></h3><p>Tests that only test code (without the running browser) are put next to the classes they test
and run using the Node test runner (requires Node 20+):</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> run unit</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="code-reviews">Code reviews<a href="#code-reviews" class="hash-link" aria-label="Direct link to Code reviews" title="Direct link to Code reviews">​</a></h2><p>All submissions, including submissions by project members, require review. We
use GitHub pull requests for this purpose. Consult
<a href="https://help.github.com/articles/about-pull-requests/" target="_blank" rel="noopener noreferrer">GitHub Help</a> for more
information on using pull requests.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="code-style">Code Style<a href="#code-style" class="hash-link" aria-label="Direct link to Code Style" title="Direct link to Code Style">​</a></h2><p>Our coding style is fully defined in
<a href="https://github.com/puppeteer/puppeteer/blob/main/.eslintrc.js" target="_blank" rel="noopener noreferrer"><code>.eslintrc</code></a>
(<a href="https://eslint.org/" target="_blank" rel="noopener noreferrer">ESLint</a>) and
<a href="https://github.com/puppeteer/puppeteer/blob/main/.prettierrc.cjs" target="_blank" rel="noopener noreferrer"><code>.prettierrc.cjs</code></a>
(<a href="https://prettier.io" target="_blank" rel="noopener noreferrer">Prettier</a>).</p><p>Code is checked for PRs automatically and you can check your code
manually by running:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> run lint</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>If some errors are returned, you can attempt to fix them using:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> run </span><span class="token function" style="color:#d73a49">format</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="project-structure">Project structure<a href="#project-structure" class="hash-link" aria-label="Direct link to Project structure" title="Direct link to Project structure">​</a></h2><p>The following is a description of the primary folders in Puppeteer:</p><ul><li><code>packages</code> contains all public source code.</li><li><code>test</code> contains all test source code.</li><li><code>test-d</code> contains type tests using
<a href="https://github.com/SamVerschueren/tsd" target="_blank" rel="noopener noreferrer"><code>tsd</code></a>.</li><li><code>tools</code> contains miscellaneous scripts that are used in building and etc.</li><li><code>tools/mocha-runner</code> - contains the source code for our test runner.</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="api-guidelines">API guidelines<a href="#api-guidelines" class="hash-link" aria-label="Direct link to API guidelines" title="Direct link to API guidelines">​</a></h2><p>When authoring new API methods, consider the following:</p><ul><li>Expose as little information as needed. When in doubt, don’t expose new
information.</li><li>Methods are used in favor of getters/setters.<ul><li>The only exception is namespaces, e.g. <code>page.keyboard</code> and <code>page.coverage</code></li></ul></li><li>All string literals must be small case. This includes event names and option
values.</li><li>Avoid adding &quot;sugar&quot; API (API that is trivially implementable in user-space)
unless they&#x27;re <strong>extremely</strong> demanded.</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="commit-messages">Commit messages<a href="#commit-messages" class="hash-link" aria-label="Direct link to Commit messages" title="Direct link to Commit messages">​</a></h2><p>Commit messages should follow
<a href="https://www.conventionalcommits.org/en/v1.0.0/#summary" target="_blank" rel="noopener noreferrer">the Conventional Commits format</a>.</p><p>In particular, breaking changes should clearly be noted as “BREAKING CHANGE:” in
the commit message footer. Example:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">fix(page): fix page.pizza method</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">This patch fixes page.pizza so that it works with iframes.</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Issues: #123, #234</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">BREAKING CHANGE: page.pizza now delivers pizza at home by default.</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">To deliver to a different location, use the &quot;deliver&quot; option:</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> `page.pizza({deliver: &#x27;work&#x27;})`.</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="writing-documentation">Writing documentation<a href="#writing-documentation" class="hash-link" aria-label="Direct link to Writing documentation" title="Direct link to Writing documentation">​</a></h2><p>Documentation is generated from TSDoc comments via <code>npm run docs</code>. It is automatically
published to our documentation site on merge and gets versioned on release.</p><p>This means that you should not change the markdown in files <code>docs/api</code> manually.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="writing-tsdoc-comments">Writing TSDoc comments<a href="#writing-tsdoc-comments" class="hash-link" aria-label="Direct link to Writing TSDoc comments" title="Direct link to Writing TSDoc comments">​</a></h2><p>Each change to Puppeteer should be thoroughly documented using TSDoc comments.
Refer to the
<a href="https://api-extractor.com/pages/tsdoc/doc_comment_syntax/" target="_blank" rel="noopener noreferrer">API Extractor documentation</a>
for information on the exact syntax.</p><ul><li>Every new method needs to have either <code>@public</code> or <code>@internal</code> added as a tag
depending on if it is part of the public API.</li><li>Keep each line in a comment to no more than 90 characters (ESLint will warn
you if you go over this). If you&#x27;re a VSCode user the
<a href="https://marketplace.visualstudio.com/items?itemName=stkb.rewrap" target="_blank" rel="noopener noreferrer">Rewrap plugin</a>
is highly recommended!</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="running-the-documentation-site-locally">Running the documentation site locally<a href="#running-the-documentation-site-locally" class="hash-link" aria-label="Direct link to Running the documentation site locally" title="Direct link to Running the documentation site locally">​</a></h2><ol><li>At root, install all dependencies with <code>npm i --ignore-scripts</code>.</li><li>run <code>npm run docs</code> which will generate all the <code>.md</code> files on
<code>puppeteer/docs/api</code>.</li><li>run <code>npm i</code> in <code>puppeteer/website</code>.</li><li>run <code>npm start</code> in <code>puppeteer/website</code>.</li></ol><h2 class="anchor anchorWithStickyNavbar_LWe7" id="adding-new-dependencies">Adding new dependencies<a href="#adding-new-dependencies" class="hash-link" aria-label="Direct link to Adding new dependencies" title="Direct link to Adding new dependencies">​</a></h2><p>For all dependencies (both installation and development):</p><ul><li><strong>Do not add</strong> a dependency if the desired functionality is easily
implementable.</li><li>If adding a dependency, it should be well-maintained and trustworthy.</li></ul><p>A barrier for introducing new installation dependencies is especially high:</p><ul><li><strong>Do not add</strong> installation dependency unless it&#x27;s critical to project
success.</li></ul><p>There are additional considerations for dependencies that are environment
agonistic. See the
<a href="https://github.com/puppeteer/puppeteer/blob/main/packages/puppeteer-core/third_party/README.md" target="_blank" rel="noopener noreferrer"><code>third_party/README.md</code></a>
for details.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="testing-tips">Testing tips<a href="#testing-tips" class="hash-link" aria-label="Direct link to Testing tips" title="Direct link to Testing tips">​</a></h2><ul><li>Every feature should be accompanied by a test.</li><li>Every public api event/method should be accompanied by a test.</li><li>Tests should not depend on external services.</li><li>Tests should work on all three platforms: Mac, Linux and Win. This is
especially important for screenshot tests.</li></ul><p>If a test is expected to fail on certain configurations or became flaky, update
<a href="https://github.com/puppeteer/puppeteer/blob/main/test/TestExpectations.json" target="_blank" rel="noopener noreferrer">TestExpectations.json</a>
to reflect that. See more info about TestExpectations.json in
<a href="https://github.com/puppeteer/puppeteer/tree/main/tools/mocha-runner" target="_blank" rel="noopener noreferrer"><code>tools/mocha-runner</code></a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="api-coverage">API Coverage<a href="#api-coverage" class="hash-link" aria-label="Direct link to API Coverage" title="Direct link to API Coverage">​</a></h2><p>Every public API method or event should be called at least once in tests. To
ensure this, the main <code>test</code> command runs coverage during testing.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="debugging-puppeteer">Debugging Puppeteer<a href="#debugging-puppeteer" class="hash-link" aria-label="Direct link to Debugging Puppeteer" title="Direct link to Debugging Puppeteer">​</a></h2><p>See <a href="https://pptr.dev/guides/debugging" target="_blank" rel="noopener noreferrer">Debugging Tips</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="debugging-puppeteer-tests-via-vscode">Debugging Puppeteer tests via VSCode<a href="#debugging-puppeteer-tests-via-vscode" class="hash-link" aria-label="Direct link to Debugging Puppeteer tests via VSCode" title="Direct link to Debugging Puppeteer tests via VSCode">​</a></h3><p>Copy the provided default <code>.vscode/launch.template.json</code> to <code>.vscode/launch.json</code> and then use the integrated VSCode debugger to debug test.</p><p>Remember to build test before launching via:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token function" style="color:#d73a49">npm</span><span class="token plain"> run build --workspace @puppeteer-test/test</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h1>For Project Maintainers</h1><h2 class="anchor anchorWithStickyNavbar_LWe7" id="rolling-new-chrome-version">Rolling new Chrome version<a href="#rolling-new-chrome-version" class="hash-link" aria-label="Direct link to Rolling new Chrome version" title="Direct link to Rolling new Chrome version">​</a></h2><p>There is a <a href="https://github.com/puppeteer/puppeteer/blob/main/.github/workflows/update-browser-pins.yml" target="_blank" rel="noopener noreferrer">GitHub action</a> that runs once per day.
The action has a manual trigger that can be found on the <a href="https://github.com/puppeteer/puppeteer/actions/workflows/update-browser-pins.yml" target="_blank" rel="noopener noreferrer">Actions Tab</a>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="manual-instructions">Manual instructions<a href="#manual-instructions" class="hash-link" aria-label="Direct link to Manual instructions" title="Direct link to Manual instructions">​</a></h3><p>You can run the <a href="https://github.com/puppeteer/puppeteer/blob/main/tools/update_chrome_revision.mjs" target="_blank" rel="noopener noreferrer"><code>tools/update_chrome_revision.mjs</code></a> locally
and try see if any changes need to be committed.</p><blockquote><p>Note: You may need to run <code>node --experimental-fetch tools/update_chrome_revision.mjs</code> as the script relies on <code>fetch</code></p></blockquote><p>The following steps are manual version of the script above.</p><ol><li>Find a suitable Chrome <code>revision</code> and <code>version</code> via <a href="https://googlechromelabs.github.io/chrome-for-testing/" target="_blank" rel="noopener noreferrer">https://googlechromelabs.github.io/chrome-for-testing/</a> or <a href="https://chromiumdash.appspot.com/" target="_blank" rel="noopener noreferrer">https://chromiumdash.appspot.com/</a>.</li><li>Update <code>packages/puppeteer-core/src/revisions.ts</code> with the found <code>version</code>
number.</li><li>Update <code>versions.js</code> with the new Chrome-to-Puppeteer <code>version</code> mapping and
update <code>lastMaintainedChromeVersion</code> with the the next one in from the list.</li><li>Run <code>npm run check</code>. If it fails, update
<code>packages/puppeteer-core/package.json</code>
with the expected <code>devtools-protocol</code> version and run <code>npm install</code> to generate an updated <code>package-lock.json</code>.</li><li>Run <code>npm run clean</code>, <code>npm install</code> and <code>npm run build</code>.</li><li>Run <code>npm test</code> and ensure that all tests pass. If a test fails,
<a href="#bisecting-upstream-changes">bisect</a> the upstream cause of the failure, and
either update the test expectations accordingly (if it was an intended
change) or work around the changes in Puppeteer (if it’s not desirable to
change Puppeteer’s observable behavior).</li><li>Commit and push your changes and open a pull request. The commit message must
contain the version in <code>Chrome &lt;version&gt; (r&lt;revision&gt;)</code> format to ensure
that <a href="https://pptr.dev/" target="_blank" rel="noopener noreferrer">pptr.dev</a> can parse it correctly, e.g.
<code>feat(chrome): roll to Chrome 90.0.4427.0 (r856583)</code>.</li></ol><blockquote><p>NOTE: Another place you can find version corresponding version is <a href="https://omahaproxy.appspot.com/" target="_blank" rel="noopener noreferrer">omahaproxy.appspot.com</a> by
searching in <code>Find Releases</code> for <code>r&lt;revision&gt;</code>.</p></blockquote><h3 class="anchor anchorWithStickyNavbar_LWe7" id="bisecting-upstream-changes">Bisecting upstream changes<a href="#bisecting-upstream-changes" class="hash-link" aria-label="Direct link to Bisecting upstream changes" title="Direct link to Bisecting upstream changes">​</a></h3><p>For bisecting Chrome/Chromium changes use <a href="https://www.chromium.org/developers/bisect-builds-py/" target="_blank" rel="noopener noreferrer">https://www.chromium.org/developers/bisect-builds-py/</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="releasing-to-npm">Releasing to npm<a href="#releasing-to-npm" class="hash-link" aria-label="Direct link to Releasing to npm" title="Direct link to Releasing to npm">​</a></h2><p>We use <a href="https://github.com/googleapis/release-please" target="_blank" rel="noopener noreferrer">release-please</a> to
automate releases. When a release should be done, check for the release PR in
our <a href="https://github.com/puppeteer/puppeteer/pulls" target="_blank" rel="noopener noreferrer">pull requests</a> and merge it.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="in-case-release-please-fails">In case Release Please fails<a href="#in-case-release-please-fails" class="hash-link" aria-label="Direct link to In case Release Please fails" title="Direct link to In case Release Please fails">​</a></h3><p>In the event release-please fails, the following needs to be done:</p><ol><li><p>Update anything missing in the CHANGELOG of every package that was supposed
to be published. For example, if the header is missing, you may need to add</p><ul><li><p>For puppeteer:</p><div class="language-md codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-md codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token title important punctuation" style="color:#393A34">##</span><span class="token title important"> [{NEW_VERSION}](https://github.com/puppeteer/puppeteer/compare/v{PREVIOUS_VERSION}...v{NEW_VERSION}) ({CURRENT_DATE})`</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li><li><p>For other packages:</p><div class="language-md codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-md codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token title important punctuation" style="color:#393A34">##</span><span class="token title important"> [{NEW_VERSION}](https://github.com/puppeteer/puppeteer/compare/{PACKAGE_FOLDER_NAME}-v{PREVIOUS_VERSION}...{PACKAGE_FOLDER_NAME}-v{NEW_VERSION}) ({CURRENT_DATE})</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></li></ul></li><li><p>Create a GitHub release for each package, following the practice of previous
releases.</p></li></ol><h2 class="anchor anchorWithStickyNavbar_LWe7" id="bug-triage-guidelines">Bug triage guidelines<a href="#bug-triage-guidelines" class="hash-link" aria-label="Direct link to Bug triage guidelines" title="Direct link to Bug triage guidelines">​</a></h2><p><a href="https://github.com/puppeteer/puppeteer/issues" target="_blank" rel="noopener noreferrer">Check incoming bug reports</a> that do not have a <code>confirmed</code> or <code>needs-feedback</code> label:</p><ol><li>Make sure the issue is labeled as either <code>bug</code> or <code>feature</code>.</li><li>If the issue does not have a clear repro or you cannot repro, ask for the repro and set the <code>needs-feedback</code> label.</li><li>Follow-up on the issues you previously asked for a feedback on (you should get a notification on GitHub when the user responds).</li><li>If the user does not provide feedback, the issue will be closed by the stale bot eventually.</li><li>If you are able to reproduce the issue, add the label <code>confirmed</code>.</li><li>If the bug is on the Chromium side, create a corresponding crbug.com issue, label the GitHub issue with the <code>upstream</code> label, and post a link to crbug.com in the comments.</li><li>If the issue is not related to either Puppeteer or Chromium, close the issue.</li><li>If the issue is about missing/incorrect documentation, label it as <code>documentation</code>.</li></ol><p>Issues with PDFs:</p><ol><li>If the issue reproduces using the regular print dialog and/or headful, <a href="https://bugs.chromium.org/p/chromium/issues/entry?components=Blink%3ELayout" target="_blank" rel="noopener noreferrer">file a crbug.com against the <code>Blink&gt;Layout</code> component</a>.</li><li>If the issue is specific to Headless mode, <a href="https://bugs.chromium.org/p/chromium/issues/entry?components=Internals%3EHeadless" target="_blank" rel="noopener noreferrer">file an issue on crbug.com against the <code>Internals&gt;Headless</code> component</a>.</li></ol></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/next/troubleshooting"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Troubleshooting</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/next/faq"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">FAQ</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#contributor-license-agreement" class="table-of-contents__link toc-highlight">Contributor License Agreement</a></li><li><a href="#getting-started" class="table-of-contents__link toc-highlight">Getting started</a></li><li><a href="#building-a-single-package" class="table-of-contents__link toc-highlight">Building a single package</a><ul><li><a href="#watch-mode" class="table-of-contents__link toc-highlight">Watch mode</a></li></ul></li><li><a href="#removing-stale-artifacts" class="table-of-contents__link toc-highlight">Removing stale artifacts</a></li><li><a href="#comprehensive-testing" class="table-of-contents__link toc-highlight">Comprehensive testing</a><ul><li><a href="#unit-tests" class="table-of-contents__link toc-highlight">Unit tests</a></li></ul></li><li><a href="#code-reviews" class="table-of-contents__link toc-highlight">Code reviews</a></li><li><a href="#code-style" class="table-of-contents__link toc-highlight">Code Style</a></li><li><a href="#project-structure" class="table-of-contents__link toc-highlight">Project structure</a></li><li><a href="#api-guidelines" class="table-of-contents__link toc-highlight">API guidelines</a></li><li><a href="#commit-messages" class="table-of-contents__link toc-highlight">Commit messages</a></li><li><a href="#writing-documentation" 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