Reading the repo
Reading the repo
How to install on Linux
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
Fresh setup, read just now
Will it work on my device?
.github/contributing.mdHi! I'm really excited that you are interested in contributing to Vue.js. Before submitting your contribution, please make sure to take a moment and read through the following guidelines:
Bug fix that addresses a clearly identified bug. "Clearly identified bug" means the bug has a proper reproduction either from a related open issue, or is included in the PR itself. Avoid submitting PRs that claim to fix something but do not sufficiently explain what is being fixed.
New feature that addresses a clearly explained and widely applicable use case. "Widely applicable" means the new feature should provide non-trivial improvements to the majority of the user base. Vue already has a large API surface so we are quite cautious about adding new features - if the use case is niche and can be addressed via userland implementations, it likely isn't suitable to go into core.
The feature implementation should also consider the trade-off between the added complexity vs. the benefits gained. For example, if a small feature requires significant changes that spread across the codebase, it is likely not worth it, or the approach should be reconsidered.
If the feature has a non-trivial API surface addition, or significantly affects the way a common use case is approached by the users, it should go through a discussion first in the RFC repo. PRs of such features without prior discussion make it really difficult to steer / adjust the API design due to coupling with concrete implementations, and can lead to wasted work.
Chore: typos, comment improvements, build config, CI config, etc. For typos and comment changes, try to combine multiple of them into a single PR.
It should be noted that we discourage contributors from submitting code refactors that are largely stylistic. Code refactors are only accepted if they improve performance, or come with sufficient explanations on why they objectively improve the code quality (e.g. makes a related feature implementation easier).
The reason is that code readability is subjective. The maintainers of this project have chosen to write the code in its current style based on our preferences, and we do not want to spend time explaining our stylistic preferences. Contributors should just respect the established conventions when contributing code.
Another aspect of it is that large scale stylistic changes result in massive diffs that touch multiple files, adding noise to the git history and make tracing behavior changes across commits more cumbersome.
Vue core has two primary work branches: main and minor.
If your pull request is a feature that adds new API surface, it should be submitted against the minor branch.
Otherwise, it should be submitted against the main branch.
Make sure to tick the "Allow edits from maintainers" box. This allows us to directly make minor edits / refactors and saves a lot of time.
If adding a new feature:
If fixing a bug:
(fix #xxxx[,#xxxx]) (#xxxx is the issue id) in your PR title for a better release log, e.g. update entities encoding/decoding (fix #3899).nr test-coverage.It's OK to have multiple small commits as you work on the PR - GitHub can automatically squash them before merging.
Make sure tests pass!
Commit messages must follow the commit message convention so that changelogs can be automatically generated. Commit messages are automatically validated before commit (by invoking Git Hooks via simple-git-hooks).
No need to worry about code style as long as you have installed the dev dependencies - modified files are automatically formatted with Prettier on commit (by invoking Git Hooks via simple-git-hooks).
The PR should fix the intended bug only and not introduce unrelated changes. This includes unnecessary refactors - a PR should focus on the fix and not code style, this makes it easier to trace changes in the future.
Consider the performance / size impact of the changes, and whether the bug being fixed justifies the cost. If the bug being fixed is a very niche edge case, we should try to minimize the size / perf cost to make it worthwhile.
Is the code perf-sensitive (e.g. in "hot paths" like component updates or the vdom patch function?)
Check how much extra bundle size the change introduces.
__DEV__ branches so they are tree-shakable.@vue/shared are compiler-only and should not be used in runtime code, e.g. isHTMLTag and isSVGTag.You will need Node.js with minimum version as specified in the .node-version file, and PNPM with minimum version as specified in the "packageManager" field in package.json.
We also recommend installing @antfu/ni to help switching between repos using different package managers. ni also provides the handy nr command which makes running npm scripts easier.
After cloning the repo, run:
$ pnpm i # install the dependencies of the project
A high level overview of tools used:
The project uses simple-git-hooks to enforce the following on each commit:
scripts/verify-commit.js)The examples below will be using the nr command from the @antfu/ni package. You can also use plain npm run, but you will need to pass all additional arguments after the command after an extra --. For example, nr build runtime --all is equivalent to npm run build -- runtime --all.
The run-s and run-p commands found in some scripts are from npm-run-all for orchestrating multiple scripts. run-s means "run in sequence" while run-p means "run in parallel".
nr buildThe build script builds all public packages (packages without private: true in their package.json).
Packages to build can be specified with fuzzy matching:
# build runtime-core only
nr build runtime-core
# build all packages matching "runtime"
nr build runtime --all
Note that nr build uses rollup-plugin-esbuild for transpiling typescript and does not perform type checking. To run type check on the entire codebase, run nr check. Type checks are also automatically run on each commit.
By default, each package will be built in multiple distribution formats as specified in the buildOptions.formats field in its package.json. These can be overwritten via the -f flag. The following formats are supported:
globalesm-bundleresm-browsercjsAdditional formats that only apply to the main vue package:
global-runtimeesm-bundler-runtimeesm-browser-runtimeMore details about each of these formats can be found in the vue package README and the Rollup config file.
For example, to build runtime-core with the global build only:
nr build runtime-core -f global
Multiple formats can be specified as a comma-separated list:
nr build runtime-core -f esm-browser,cjs
Use the --sourcemap or -s flag to build with source maps. Note this will make the build much slower.
nr build-dtsThis command builds the type declarations for all packages. It first generates the raw .d.ts files in the temp directory, then uses rollup-plugin-dts to roll the types into a single .d.ts file for each package.
nr checknr devThe dev script bundles a target package (default: vue) in a specified format (default: global) in dev mode and watches for changes. This is useful when you want to load up a build in an HTML page for quick debugging:
$ nr dev
> built: packages/vue/dist/vue.global.js
Important: output of the dev script is for development and debugging only. While it has the same runtime behavior, the generated code should never be published to npm.
The dev script does not support fuzzy match - you must specify the full package name, e.g. nr dev runtime-core.
The dev script supports specifying build format via the -f flag just like the build script.
The dev script also supports the -s flag for generating source maps, but it will make rebuilds slower.
The dev script supports the -i flag for inlining all deps. This is useful when debugging esm-bundler builds which externalize deps by default.
nr dev-sfcShortcut for starting the SFC Playground in local dev mode. This provides the fastest feedback loop when debugging issues that can be reproduced in the SFC Playground.
nr dev-esmBuilds and watches vue/dist/vue-runtime.esm-bundler.js with all deps inlined using esbuild. This is useful when debugging the ESM build in a reproduction that requires real build setups: link packages/vue globally, then link it into the project being debugged.
nr dev-compilerThe dev-compiler script builds, watches and serves the Template Explorer at http://localhost:3000. This is useful when working on pure compiler issues.
nr testThe test script simply calls the vitest binary, so all Vitest CLI Options can be used. Some examples:
# run all tests in watch mode
$ nr test
# run once and exit (equivalent to `vitest run`)
$ nr test run
# run all tests under the runtime-core package
$ nr test runtime-core
# run tests in files matching the pattern
$ nr test <fileNamePattern>
# run a specific test in specific files
$ nr test <fileNamePattern> -t 'test name'
Tests that test against source code are grouped under nr test-unit, while tests that test against built files that run in real browsers are grouped under nr test-e2e.
nr test-dtsRuns nr build-dts first, then verify the type tests in packages-private/dts-test are working correctly against the actual built type declarations.
This repository employs a monorepo setup which hosts a number of associated packages under the packages directory:
reactivity: The reactivity system. It can be used standalone as a framework-agnostic package.
runtime-core: The platform-agnostic runtime core. Includes code for the virtual dom renderer, component implementation and JavaScript APIs. Higher-order runtimes (i.e. custom renderers) targeting specific platforms can be created using this package.
runtime-dom: The runtime targeting the browser. Includes handling of native DOM API, attributes, properties, event handlers etc.
runtime-test: The lightweight runtime for testing. Can be used in any JavaScript environment since it "renders" a tree of plain JavaScript objects. The tree can be used to assert correct render output. Also provides utilities for serializing the tree, triggering events, and recording actual node operations performed during an update.
server-renderer: Package for server-side rendering.
compiler-core: The platform-agnostic compiler core. Includes the extensible base of the compiler and all platform-agnostic plugins.
compiler-dom: Compiler with additional plugins specifically targeting the browser.
compiler-sfc: Lower level utilities for compiling Vue Single File Components.
compiler-ssr: Compiler that produces render functions optimized for server-side rendering.
shared: Internal utilities shared across multiple packages (especially environment-agnostic utils used by both runtime and compiler packages).
vue: The public facing "full build" which includes both the runtime AND the compiler.
Private utility packages:
dts-test: Contains type-only tests against generated dts files.
sfc-playground: The playground continuously deployed at https://play.vuejs.org. To run the playground locally, use nr dev-sfc.
template-explorer: A development tool for debugging compiler output, continuously deployed at https://template-explorer.vuejs.org/. To run it locally, run nr dev-compiler.
The packages can import each other directly using their package names. Note that when importing a package, the name listed in its package.json should be used. Most of the time the @vue/ prefix is needed:
import { h } from '@vue/runtime-core'
This is made possible via several configurations:
compilerOptions.paths in tsconfig.jsonscripts/aliases.js flowchart LR
compiler-sfc["@vue/compiler-sfc"]
compiler-dom["@vue/compiler-dom"]
compiler-core["@vue/compiler-core"]
vue["vue"]
runtime-dom["@vue/runtime-dom"]
runtime-core["@vue/runtime-core"]
reactivity["@vue/reactivity"]
subgraph "Runtime Packages"
runtime-dom --> runtime-core
runtime-core --> reactivity
end
subgraph "Compiler Packages"
compiler-sfc --> compiler-core
compiler-sfc --> compiler-dom
compiler-dom --> compiler-core
end
vue ---> compiler-dom
vue --> runtime-dom
There are some rules to follow when importing across package boundaries:
Never use direct relative paths when importing items from another package - export it in the source package and import it at the package level.
Compiler packages should not import items from the runtime, and vice versa. If something needs to be shared between the compiler-side and runtime-side, it should be extracted into @vue/shared instead.
If a package (A) has a non-type import, or re-exports a type from another package (B), then (B) should be listed as a dependency in (A)'s package.json. This is because the packages are externalized in the ESM-bundler/CJS builds and type declaration files, so the dependency packages must be actually installed as a dependency when consumed from package registries.
Unit tests are collocated with the code being tested in each package, inside directories named __tests__. Consult the Vitest docs and existing test cases for how to write new test specs. Here are some additional guidelines:
Use the minimal API needed for a test case. For example, if a test can be written without involving the reactivity system or a component, it should be written so. This limits the test's exposure to changes in unrelated parts and makes it more stable.
If testing platform agnostic behavior or asserting low-level virtual DOM operations, use @vue/runtime-test.
Only use platform-specific runtimes if the test is asserting platform-specific behavior.
Test coverage is continuously deployed at https://coverage.vuejs.org. PRs that improve test coverage are welcome, but in general the test coverage should be used as a guidance for finding API use cases that are not covered by tests. We don't recommend adding tests that only improve coverage but not actually test a meaningful use case.
Type tests are located in the packages-private/dts-test directory. To run the dts tests, run nr test-dts. Note that the type test requires all relevant *.d.ts files to be built first (and the script does it for you). Once the d.ts files are built and up-to-date, the tests can be re-run by running nr test-dts-only.
As a pure community-driven project without major corporate backing, we also welcome financial contributions via Patreon and OpenCollective.
Funds donated via Patreon go directly to support Evan You's full-time work on Vue.js. Funds donated via OpenCollective are managed with transparent expenses and will be used for compensating work and expenses for core team members or sponsoring community events. Your name/logo will receive proper recognition and exposure by donating on either platform.
Thank you to all the people who have already contributed to Vue.js!
<a href="https://github.com/vuejs/core/graphs/contributors"><img src="https://opencollective.com/vuejs/contributors.svg?width=890" /></a>
Then run bash setup.sh. It stops at the first error and is safe to run again. Servers and tests aren't started; it lists them at the end. Read it first.
git clone https://github.com/vuejs/core.git cd core
Node.js lts/*
# needs nvm: https://github.com/nvm-sh/nvm nvm install --lts
corepack enable pnpm install
pnpm dev
pnpm test
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