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We'd love to accept your\npatches and contributions!"),(0,a.kt)("h2",i({},{id:"contributor-license-agreement"}),"Contributor License Agreement"),(0,a.kt)("p",null,"Contributions to this project must be accompanied by a Contributor License\nAgreement. You (or your employer) retain the copyright to your contribution,\nthis simply gives us permission to use and redistribute your contributions as\npart of the project. Head over to ",(0,a.kt)("a",i({parentName:"p"},{href:"https://cla.developers.google.com/"}),"https://cla.developers.google.com/")," to see\nyour current agreements on file or to sign a new one."),(0,a.kt)("p",null,"You generally only need to submit a CLA once, so if you've already submitted one\n(even if it was for a different project), you probably don't need to do it\nagain."),(0,a.kt)("h2",i({},{id:"getting-started"}),"Getting started"),(0,a.kt)("ol",null,(0,a.kt)("li",{parentName:"ol"},(0,a.kt)("p",{parentName:"li"},"Clone this repository"),(0,a.kt)("pre",{parentName:"li"},(0,a.kt)("code",i({parentName:"pre"},{className:"language-sh"}),"git clone https://github.com/puppeteer/puppeteer\ncd puppeteer\n"))),(0,a.kt)("li",{parentName:"ol"},(0,a.kt)("p",{parentName:"li"},"Install the dependencies"),(0,a.kt)("pre",{parentName:"li"},(0,a.kt)("code",i({parentName:"pre"},{className:"language-sh"}),"npm install # or PUPPETEER_PRODUCT=firefox npm install\n"))),(0,a.kt)("li",{parentName:"ol"},(0,a.kt)("p",{parentName:"li"},"Build all packages"),(0,a.kt)("pre",{parentName:"li"},(0,a.kt)("code",i({parentName:"pre"},{className:"language-sh"}),"npm run build\n"))),(0,a.kt)("li",{parentName:"ol"},(0,a.kt)("p",{parentName:"li"},"Run all tests"),(0,a.kt)("pre",{parentName:"li"},(0,a.kt)("code",i({parentName:"pre"},{className:"language-sh"}),"npm test\n")))),(0,a.kt)("h3",i({},{id:"macos-arm-and-custom-executables"}),"macOS ARM and custom executables."),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},(0,a.kt)("p",{parentName:"li"},"To run experimental Chromium macOS ARM tests, firstly ensure you have correct\nChromium version installed locally (you only need to do this once, not on\nevery test run) and then you can run the tests:"),(0,a.kt)("pre",{parentName:"li"},(0,a.kt)("code",i({parentName:"pre"},{className:"language-bash"}),"PUPPETEER_EXPERIMENTAL_CHROMIUM_MAC_ARM=1 npm install\nPUPPETEER_EXPERIMENTAL_CHROMIUM_MAC_ARM=1 npm run test\n"))),(0,a.kt)("li",{parentName:"ul"},(0,a.kt)("p",{parentName:"li"},"To run tests with custom browser executable:"),(0,a.kt)("pre",{parentName:"li"},(0,a.kt)("code",i({parentName:"pre"},{className:"language-bash"}),"BINARY=<path-to-chrome/firefox-executable> npm run test:chrome # Or npm run test:firefox\n")))),(0,a.kt)("h2",i({},{id:"building-a-single-package"}),"Building a single package"),(0,a.kt)("p",null,"To build a single package, you can run"),(0,a.kt)("pre",null,(0,a.kt)("code",i({parentName:"pre"},{className:"language-sh"}),"npm run build --workspace <package> # e.g. puppeteer\n")),(0,a.kt)("p",null,"This will build all dependent packages automatically, so specifying a single\npackages is sufficient. This is all possible due to\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://github.com/google/wireit"}),"wireit")," which behaves similar to\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://www.gnu.org/software/make/"}),"GNU Make"),"."),(0,a.kt)("h2",i({},{id:"removing-stale-artifacts"}),"Removing stale artifacts"),(0,a.kt)("p",null,"It's possible some generated artifacts (such as\n",(0,a.kt)("inlineCode",{parentName:"p"},"packages/puppeteer-core/src/types.ts"),") can become stale since these artifacts\nrely on complex conditions (such as names of distinct files) that cannot be\ncaptured by the build system. 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See more info about the test\nrunner in\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://github.com/puppeteer/puppeteer/tree/main/tools/mochaRunner"}),(0,a.kt)("inlineCode",{parentName:"a"},"tools/mochaRunner")),"."),(0,a.kt)("h2",i({},{id:"code-reviews"}),"Code reviews"),(0,a.kt)("p",null,"All submissions, including submissions by project members, require review. We\nuse GitHub pull requests for this purpose. Consult\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://help.github.com/articles/about-pull-requests/"}),"GitHub Help")," for more\ninformation on using pull requests."),(0,a.kt)("h2",i({},{id:"code-style"}),"Code Style"),(0,a.kt)("p",null,"Our coding style is fully defined in\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://github.com/puppeteer/puppeteer/blob/main/.eslintrc.js"}),(0,a.kt)("inlineCode",{parentName:"a"},".eslintrc")),"\n(",(0,a.kt)("a",i({parentName:"p"},{href:"https://eslint.org/"}),"ESLint"),") and\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://github.com/puppeteer/puppeteer/blob/main/.prettierrc.cjs"}),(0,a.kt)("inlineCode",{parentName:"a"},".prettierrc.cjs")),"\n(",(0,a.kt)("a",i({parentName:"p"},{href:"https://prettier.io"}),"Prettier"),")."),(0,a.kt)("p",null,"Code is checked during ",(0,a.kt)("inlineCode",{parentName:"p"},"pre-push")," using\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://typicode.github.io/husky/#/"}),"Husky"),", but you can check your code\nmanually by running:"),(0,a.kt)("pre",null,(0,a.kt)("code",i({parentName:"pre"},{className:"language-bash"}),"npm run lint\n")),(0,a.kt)("p",null,"If some errors are returned, you can attempt to fix them using:"),(0,a.kt)("pre",null,(0,a.kt)("code",i({parentName:"pre"},{className:"language-bash"}),"npm run format\n")),(0,a.kt)("h2",i({},{id:"project-structure"}),"Project structure"),(0,a.kt)("p",null,"The following is a description of the primary folders in Puppeteer:"),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},(0,a.kt)("inlineCode",{parentName:"li"},"packages")," contains all public source code."),(0,a.kt)("li",{parentName:"ul"},(0,a.kt)("inlineCode",{parentName:"li"},"test")," contains all test source code."),(0,a.kt)("li",{parentName:"ul"},(0,a.kt)("inlineCode",{parentName:"li"},"test-d")," contains type tests using\n",(0,a.kt)("a",i({parentName:"li"},{href:"https://github.com/SamVerschueren/tsd"}),(0,a.kt)("inlineCode",{parentName:"a"},"tsd")),"."),(0,a.kt)("li",{parentName:"ul"},(0,a.kt)("inlineCode",{parentName:"li"},"tools")," contains miscellaneous scripts that are used in building and etc."),(0,a.kt)("li",{parentName:"ul"},(0,a.kt)("inlineCode",{parentName:"li"},"tools/mochaRunner")," - contains the source code for our test runner.")),(0,a.kt)("h2",i({},{id:"api-guidelines"}),"API guidelines"),(0,a.kt)("p",null,"When authoring new API methods, consider the following:"),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},"Expose as little information as needed. When in doubt, don\u2019t expose new\ninformation."),(0,a.kt)("li",{parentName:"ul"},"Methods are used in favor of getters/setters.",(0,a.kt)("ul",{parentName:"li"},(0,a.kt)("li",{parentName:"ul"},"The only exception is namespaces, e.g. ",(0,a.kt)("inlineCode",{parentName:"li"},"page.keyboard")," and ",(0,a.kt)("inlineCode",{parentName:"li"},"page.coverage")))),(0,a.kt)("li",{parentName:"ul"},"All string literals must be small case. This includes event names and option\nvalues."),(0,a.kt)("li",{parentName:"ul"},'Avoid adding "sugar" API (API that is trivially implementable in user-space)\nunless they\'re ',(0,a.kt)("strong",{parentName:"li"},"extremely")," demanded.")),(0,a.kt)("h2",i({},{id:"commit-messages"}),"Commit messages"),(0,a.kt)("p",null,"Commit messages should follow\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://www.conventionalcommits.org/en/v1.0.0/#summary"}),"the Conventional Commits format"),".\nThis is enforced via ",(0,a.kt)("inlineCode",{parentName:"p"},"npm run commitlint"),"."),(0,a.kt)("p",null,"In particular, breaking changes should clearly be noted as \u201cBREAKING CHANGE:\u201d in\nthe commit message footer. Example:"),(0,a.kt)("pre",null,(0,a.kt)("code",i({parentName:"pre"},{}),"fix(page): fix page.pizza method\n\nThis patch fixes page.pizza so that it works with iframes.\n\nIssues: #123, #234\n\nBREAKING CHANGE: page.pizza now delivers pizza at home by default.\nTo deliver to a different location, use the \"deliver\" option:\n  `page.pizza({deliver: 'work'})`.\n")),(0,a.kt)("h2",i({},{id:"writing-documentation"}),"Writing documentation"),(0,a.kt)("p",null,"Documentation is generated via ",(0,a.kt)("inlineCode",{parentName:"p"},"npm run docs"),". It is automatically published to\nour documentation site on merge and gets versioned on release."),(0,a.kt)("h2",i({},{id:"writing-tsdoc-comments"}),"Writing TSDoc comments"),(0,a.kt)("p",null,"Each change to Puppeteer should be thoroughly documented using TSDoc comments.\nRefer to the\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://api-extractor.com/pages/tsdoc/doc_comment_syntax/"}),"API Extractor documentation"),"\nfor information on the exact syntax."),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},"Every new method needs to have either ",(0,a.kt)("inlineCode",{parentName:"li"},"@public")," or ",(0,a.kt)("inlineCode",{parentName:"li"},"@internal")," added as a tag\ndepending on if it is part of the public API."),(0,a.kt)("li",{parentName:"ul"},"Keep each line in a comment to no more than 90 characters (ESLint will warn\nyou if you go over this). If you're a VSCode user the\n",(0,a.kt)("a",i({parentName:"li"},{href:"https://marketplace.visualstudio.com/items?itemName=stkb.rewrap"}),"Rewrap plugin"),"\nis highly recommended!")),(0,a.kt)("h2",i({},{id:"running-the-documentation-site-locally"}),"Running the documentation site locally"),(0,a.kt)("ol",null,(0,a.kt)("li",{parentName:"ol"},"At root, install all dependencies with ",(0,a.kt)("inlineCode",{parentName:"li"},"npm i --ignore-scripts"),"."),(0,a.kt)("li",{parentName:"ol"},"run ",(0,a.kt)("inlineCode",{parentName:"li"},"npm run docs")," which will generate all the ",(0,a.kt)("inlineCode",{parentName:"li"},".md")," files on\n",(0,a.kt)("inlineCode",{parentName:"li"},"puppeteer/docs/api"),"."),(0,a.kt)("li",{parentName:"ol"},"run ",(0,a.kt)("inlineCode",{parentName:"li"},"npm i")," in ",(0,a.kt)("inlineCode",{parentName:"li"},"puppeteer/website"),"."),(0,a.kt)("li",{parentName:"ol"},"run ",(0,a.kt)("inlineCode",{parentName:"li"},"npm start")," in ",(0,a.kt)("inlineCode",{parentName:"li"},"puppeteer/website"),".")),(0,a.kt)("h2",i({},{id:"adding-new-dependencies"}),"Adding new dependencies"),(0,a.kt)("p",null,"For all dependencies (both installation and development):"),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},(0,a.kt)("strong",{parentName:"li"},"Do not add")," a dependency if the desired functionality is easily\nimplementable."),(0,a.kt)("li",{parentName:"ul"},"If adding a dependency, it should be well-maintained and trustworthy.")),(0,a.kt)("p",null,"A barrier for introducing new installation dependencies is especially high:"),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},(0,a.kt)("strong",{parentName:"li"},"Do not add")," installation dependency unless it's critical to project\nsuccess.")),(0,a.kt)("p",null,"There are additional considerations for dependencies that are environment\nagonistic. See the\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://github.com/puppeteer/puppeteer/blob/main/third_party/README.md"}),(0,a.kt)("inlineCode",{parentName:"a"},"third_party/README.md")),"\nfor details."),(0,a.kt)("h2",i({},{id:"testing-tips"}),"Testing tips"),(0,a.kt)("ul",null,(0,a.kt)("li",{parentName:"ul"},"Every feature should be accompanied by a test."),(0,a.kt)("li",{parentName:"ul"},"Every public api event/method should be accompanied by a test."),(0,a.kt)("li",{parentName:"ul"},"Tests should not depend on external services."),(0,a.kt)("li",{parentName:"ul"},"Tests should work on all three platforms: Mac, Linux and Win. This is\nespecially important for screenshot tests.")),(0,a.kt)("p",null,"If a test is expected to fail on certain configurations or became flaky, update\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://github.com/puppeteer/puppeteer/blob/main/test/TestExpectations.json"}),"TestExpectations.json"),"\nto reflect that. See more info about TestExpectations.json in\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://github.com/puppeteer/puppeteer/tree/main/tools/mochaRunner"}),(0,a.kt)("inlineCode",{parentName:"a"},"tools/mochaRunner")),"."),(0,a.kt)("h2",i({},{id:"api-coverage"}),"API Coverage"),(0,a.kt)("p",null,"Every public API method or event should be called at least once in tests. To\nensure this, the main ",(0,a.kt)("inlineCode",{parentName:"p"},"test")," command runs coverage during testing."),(0,a.kt)("h2",i({},{id:"debugging-puppeteer"}),"Debugging Puppeteer"),(0,a.kt)("p",null,"See\n",(0,a.kt)("a",i({parentName:"p"},{href:"https://github.com/puppeteer/puppeteer/blob/main/README.md#debugging-tips"}),"Debugging Tips"),"\nin the readme."),(0,a.kt)("h1",i({},{id:"for-project-maintainers"}),"For Project Maintainers"),(0,a.kt)("h2",i({},{id:"rolling-new-chromium-version"}),"Rolling new Chromium version"),(0,a.kt)("p",null,"The following steps are needed to update the Chromium version."),(0,a.kt)("ol",null,(0,a.kt)("li",{parentName:"ol"},"Find a suitable Chromium revision. Not all revisions have builds for all\nplatforms, so we need to find one that does. The easiest way is to run\n",(0,a.kt)("inlineCode",{parentName:"li"},"tools/check_availability.js -rd")," to find the latest suitable ",(0,a.kt)("inlineCode",{parentName:"li"},"dev")," Chromium\nrevision (see ",(0,a.kt)("inlineCode",{parentName:"li"},"tools/check_availability.js -help")," for more options)."),(0,a.kt)("li",{parentName:"ol"},"Update ",(0,a.kt)("inlineCode",{parentName:"li"},"packages/puppeteer-core/src/revisions.ts")," with the found revision\nnumber."),(0,a.kt)("li",{parentName:"ol"},"Update ",(0,a.kt)("inlineCode",{parentName:"li"},"versions.js")," with the new Chromium-to-Puppeteer version mapping and\nupdate ",(0,a.kt)("inlineCode",{parentName:"li"},"lastMaintainedChromiumVersion")," with the latest stable Chrome version."),(0,a.kt)("li",{parentName:"ol"},"Run ",(0,a.kt)("inlineCode",{parentName:"li"},"npm run check"),". If it fails, update\n",(0,a.kt)("inlineCode",{parentName:"li"},"packages/puppeteer-core/package.json")," and ",(0,a.kt)("inlineCode",{parentName:"li"},"packages/puppeteer/package.json"),"\nwith the expected ",(0,a.kt)("inlineCode",{parentName:"li"},"devtools-protocol")," version."),(0,a.kt)("li",{parentName:"ol"},"Run ",(0,a.kt)("inlineCode",{parentName:"li"},"npm run clean"),", ",(0,a.kt)("inlineCode",{parentName:"li"},"npm run build")," and ",(0,a.kt)("inlineCode",{parentName:"li"},"npm install"),"."),(0,a.kt)("li",{parentName:"ol"},"Run ",(0,a.kt)("inlineCode",{parentName:"li"},"npm test")," and ensure that all tests pass. If a test fails,\n",(0,a.kt)("a",i({parentName:"li"},{href:"#bisecting-upstream-changes"}),"bisect")," the upstream cause of the failure, and\neither update the test expectations accordingly (if it was an intended\nchange) or work around the changes in Puppeteer (if it\u2019s not desirable to\nchange Puppeteer\u2019s observable behavior)."),(0,a.kt)("li",{parentName:"ol"},"Commit and push your changes and open a pull request. The commit message must\ncontain the version in ",(0,a.kt)("inlineCode",{parentName:"li"},"Chromium <version> (<revision>)")," format to ensure\nthat ",(0,a.kt)("a",i({parentName:"li"},{href:"https://pptr.dev/"}),"pptr.dev")," can parse it correctly, e.g.\n",(0,a.kt)("inlineCode",{parentName:"li"},"'feat(chromium): roll to Chromium 90.0.4427.0 (r856583)'"),".")),(0,a.kt)("h3",i({},{id:"bisecting-upstream-changes"}),"Bisecting upstream changes"),(0,a.kt)("p",null,"Sometimes, performing a Chromium roll causes tests to fail. To figure out the\ncause, you need to bisect Chromium revisions to figure out the earliest possible\nrevision that changed the behavior. The ",(0,a.kt)("inlineCode",{parentName:"p"},"bisect")," script can be helpful here.\nGiven a pattern for one or more unit tests, it will automatically bisect the\ncurrent range:"),(0,a.kt)("pre",null,(0,a.kt)("code",i({parentName:"pre"},{className:"language-sh"}),"npm run bisect -- --good 686378 --bad 706915 script.js\nnpm run bisect -- --unit-test Response.fromCache\n")),(0,a.kt)("p",null,"By default, it will use the Chromium revision in\n",(0,a.kt)("inlineCode",{parentName:"p"},"packages/puppeteer-core/src/revisions.ts")," from the ",(0,a.kt)("inlineCode",{parentName:"p"},"main")," branch and from the\nworking tree to determine the range to bisect."),(0,a.kt)("h2",i({},{id:"releasing-to-npm"}),"Releasing to npm"),(0,a.kt)("p",null,"We use ",(0,a.kt)("a",i({parentName:"p"},{href:"https://github.com/googleapis/release-please"}),"release-please")," to\nautomate releases. When a release should be done, check for the release PR in\nour ",(0,a.kt)("a",i({parentName:"p"},{href:"https://github.com/puppeteer/puppeteer/pulls"}),"pull requests")," and merge it."),(0,a.kt)("h3",i({},{id:"in-case-release-please-fails"}),"In case Release Please fails"),(0,a.kt)("p",null,"In the event release-please fails, the following needs to be done:"),(0,a.kt)("ol",null,(0,a.kt)("li",{parentName:"ol"},(0,a.kt)("p",{parentName:"li"},"Update anything missing in the CHANGELOG of every package that was supposed\nto be published. For example, if the header is missing, you may need to add"),(0,a.kt)("ul",{parentName:"li"},(0,a.kt)("li",{parentName:"ul"},(0,a.kt)("p",{parentName:"li"},"For puppeteer:"),(0,a.kt)("pre",{parentName:"li"},(0,a.kt)("code",i({parentName:"pre"},{className:"language-md"}),"## [{NEW_VERSION}](https://github.com/puppeteer/puppeteer/compare/v{PREVIOUS_VERSION}...v{NEW_VERSION}) ({CURRENT_DATE})`\n"))),(0,a.kt)("li",{parentName:"ul"},(0,a.kt)("p",{parentName:"li"},"For other packages:"),(0,a.kt)("pre",{parentName:"li"},(0,a.kt)("code",i({parentName:"pre"},{className:"language-md"}),"## [{NEW_VERSION}](https://github.com/puppeteer/puppeteer/compare/{PACKAGE_FOLDER_NAME}-v{PREVIOUS_VERSION}...{PACKAGE_FOLDER_NAME}-v{NEW_VERSION}) ({CURRENT_DATE})\n"))))),(0,a.kt)("li",{parentName:"ol"},(0,a.kt)("p",{parentName:"li"},"Create a GitHub release for each package, following the practice of previous\nreleases."))),(0,a.kt)("h2",i({},{id:"bug-triage-guidelines"}),"Bug triage guidelines"),(0,a.kt)("p",null,(0,a.kt)("a",i({parentName:"p"},{href:"https://github.com/puppeteer/puppeteer/issues"}),"Check incoming bug reports")," that do not have a ",(0,a.kt)("inlineCode",{parentName:"p"},"confirmed")," or ",(0,a.kt)("inlineCode",{parentName:"p"},"needs-feedback")," label:"),(0,a.kt)("ol",null,(0,a.kt)("li",{parentName:"ol"},"Make sure the issue is labeled as either ",(0,a.kt)("inlineCode",{parentName:"li"},"bug")," or ",(0,a.kt)("inlineCode",{parentName:"li"},"feature"),"."),(0,a.kt)("li",{parentName:"ol"},"If the issue does not have a clear repro or you cannot repro, ask for the repro and set the ",(0,a.kt)("inlineCode",{parentName:"li"},"needs-feedback")," label."),(0,a.kt)("li",{parentName:"ol"},"Follow-up on the issues you previously asked for a feedback on (you should get a notification on GitHub when the user responds)."),(0,a.kt)("li",{parentName:"ol"},"If the user does not provide feedback, the issue will be closed by the stale bot eventually."),(0,a.kt)("li",{parentName:"ol"},"If you are able to reproduce the issue, add the label ",(0,a.kt)("inlineCode",{parentName:"li"},"confirmed"),"."),(0,a.kt)("li",{parentName:"ol"},"If the bug is on the Chromium side, create a corresponding crbug.com issue, label the GitHub issue with the ",(0,a.kt)("inlineCode",{parentName:"li"},"upstream")," label, and post a link to crbug.com in the comments."),(0,a.kt)("li",{parentName:"ol"},"If the issue is not related to either Puppeteer or Chromium, close the issue."),(0,a.kt)("li",{parentName:"ol"},"If the issue is about missing/incorrect documentation, label it as ",(0,a.kt)("inlineCode",{parentName:"li"},"documentation"),".")),(0,a.kt)("p",null,"Issues with PDFs:"),(0,a.kt)("ol",null,(0,a.kt)("li",{parentName:"ol"},"If the issue reproduces using the regular print dialog and/or headful, ",(0,a.kt)("a",i({parentName:"li"},{href:"https://bugs.chromium.org/p/chromium/issues/entry?components=Blink%3ELayout"}),"file a crbug.com against the ",(0,a.kt)("inlineCode",{parentName:"a"},"Blink>Layout")," component"),"."),(0,a.kt)("li",{parentName:"ol"},"If the issue is specific to Headless mode, ",(0,a.kt)("a",i({parentName:"li"},{href:"https://bugs.chromium.org/p/chromium/issues/entry?components=Internals%3EHeadless"}),"file an issue on crbug.com against the ",(0,a.kt)("inlineCode",{parentName:"a"},"Internals>Headless")," component"),".")))}c.isMDXComponent=!0}}]);