Get rid of rush and move to pnpm (#2775)

Remove the opinionated (wrongly so most of the time) middleman that
brings more config pain than value.

Things to check:
- [x] Parallel build performance vs rush
- [ ] Publishing with submodule
- [x] Changesets

.changeset/README.md

@@ -0,0 +1,8 @@
+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets)
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md)

.changeset/config.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://unpkg.com/@changesets/[email protected]/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "fixed": [["@typespec/*"]],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.changeset/neat-ducks-camp.md

@@ -0,0 +1,2 @@
+---
+---

.github/workflows/consistency.yml

@@ -0,0 +1,32 @@
+name: Consistency
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the "main" branch
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+  workflow_dispatch: {}
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  check-changes:
+    name: Check Changes
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0 ## Needed for Changesets to find `main` branch
+
+      - run: git pull --force --no-tags origin main:main
+        name: Get main ref
+
+      - name: Use Node.js 20.x
+        uses: actions/setup-node@v3
+        with:
+          node-version: 20.x
+
+      - run: npx -p @changesets/cli changeset status --since=main
+        name: Check changelog
+        if: ${{ !startsWith(github.head_ref, 'publish/') && !startsWith(github.head_ref, 'dependabot/') && !startsWith(github.head_ref, 'backmerge/') }}

.github/workflows/website-gh-pages.yml

@@ -31,11 +31,13 @@ jobs:
         with:
           node-version: 18.x
 
+      - uses: pnpm/action-setup@v2
+
       - name: Install dependencies
-        run: node common/scripts/install-run-rush.js install --max-install-attempts 3
+        run: pnpm install
 
       - name: Build
-        run: node common/scripts/install-run-rush.js build --to @typespec/website -v
+        run: pnpm run build --to @typespec/website -v
         env:
           # Only when deploying to microsoft.github.io/typespec. For typespec.io use the default value.
           # TYPESPEC_WEBSITE_BASE_PATH: "/typespec/"

.prettierignore

@@ -9,7 +9,12 @@
 common/temp/
 common/scripts/
 common/changes/
-common/config/rush/pnpm-lock.yaml
+
+# Pnpm lock file
+pnpm-lock.yaml
+
+# Emu spec file, formatting is wrong
+packages/spec/src/spec.emu.html
 
 # Coverage report directory
 **/coverage/

.prettierrc.json

@@ -9,7 +9,7 @@
   "tabWidth": 2,
   "plugins": [
     "./packages/prettier-plugin-typespec/dist/index.js",
-    "./packages/compiler/node_modules/prettier-plugin-organize-imports/index.js"
+    "./node_modules/prettier-plugin-organize-imports/index.js"
   ],
   "overrides": [
     {

.vscode/settings.json

@@ -53,11 +53,11 @@
     "pnpm-config.json": "jsonc",
     "version-policies.json": "jsonc"
   },
-  "typescript.tsdk": "./packages/compiler/node_modules/typescript/lib",
+  "typescript.tsdk": "./node_modules/typescript/lib",
   "git.ignoreLimitWarning": true,
   "vitest.enable": true,
-  "vitest.commandLine": "node ./packages/compiler/node_modules/vitest/vitest.mjs",
-  "prettier.prettierPath": "./packages/compiler/node_modules/prettier/index.cjs",
+  "vitest.commandLine": "node ./node_modules/vitest/vitest.mjs",
+  "prettier.prettierPath": "./node_modules/prettier/index.cjs",
   "prettier.documentSelectors": ["**/*.tsp"],
   "testExplorer.errorDecoration": false,
   "typespec.tsp-server.path": "${workspaceFolder}/packages/compiler"