message: docs: replace yarn with pnpm in contributing.md [skip ci]
diff: @@ -28,7 +28,7 @@ Hi! I'm really excited that you are interested in contributing to Vue Router. Be
  - If you are resolving a special issue, add `(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)`.
  - Provide a detailed description of the bug in the PR. Live demo preferred.
  - - Add appropriate test coverage if applicable. You can check the coverage of your code addition by running `yarn test --coverage`.
  + - Add appropriate test coverage if applicable. You can check the coverage of your code addition by running `pnpm test --coverage`.
  - It's OK to have multiple small commits as you work on the PR - GitHub can automatically squash them before merging.
  @@ -40,12 +40,12 @@ Hi! I'm really excited that you are interested in contributing to Vue Router. Be
  ## Development Setup
  -You will need [Node.js](http://nodejs.org) **version 10+**, and [Yarn](https://classic.yarnpkg.com/en/docs/install).
  +You will need [Node.js](http://nodejs.org) **version 10+**, and [Pnpm](https://pnpm.io/installation).
  After cloning the repo, run:
  ```bash
  -$ yarn # install the dependencies of the project
  +$ pnpm install # install the dependencies of the project
  ```
  A high level overview of tools used:
  @@ -57,21 +57,21 @@ A high level overview of tools used:
  ## Scripts
  -### `yarn build`
  +### `pnpm build`
  The `build` script builds vue-router
  -### `yarn dev`
  +### `pnpm play`
  -The `dev` scripts starts a playground project located at `playground/` that allows you to test things on a browser.
  +The `play` scripts starts a playground project located at `playground/` that allows you to test things on a browser.
  ```bash
  -$ yarn dev
  +$ pnpm play
  ```
  -### `yarn test`
  +### `pnpm test`
  -The `yarn test` script runs all checks:
  +The `pnpm test` script runs all checks:
  - _Typings_: `test:types`
  - _Linting_: `test:lint`
  @@ -80,10 +80,10 @@ The `yarn test` script runs all checks:
  ```bash
  # run all tests
  -$ yarn test
  +$ pnpm test
  # run unit tests in watch mode
  -$ yarn jest --watch
  +$ pnpm jest --watch
  ```
  ## Project Structure
  