upgrade to yarn v4, remove incompatible github actions

Author: jakemhiller

.circleci/config.yml

@@ -114,7 +114,7 @@ jobs:
       - checkout
       - *set_npm_token
       - *restore_yarn_cache
-      - run: yarn --production=false --frozen-lockfile
+      - run: yarn install --immutable
       - *save_yarn_cache
       - *save_node_modules
 

.github/actions/yarn/action.yml

@@ -0,0 +1,18 @@
+name: 'Restore Yarn Cache'
+description: 'Setup a NodeJS environment and restore cache if any, given a node version'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Setup Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version-file: .nvmrc
+    - uses: actions/cache@v4
+      with:
+        path: |
+          **/node_modules
+        key: v1-yarn-${{ runner.os }}-${{ hashFiles('.nvmrc') }}-${{ hashFiles('**/yarn.lock') }}
+    - name: Install Dependencies If Not Cached
+      run: \[ -d node_modules \] || yarn install --immutable
+      shell: bash

.github/workflows/auto-request-reviews.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event.pull_request.draft == false
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Request review based on files changed
         uses: ohnogumi/[email protected]
         with:

.github/workflows/codeql-analysis.yml

@@ -4,10 +4,9 @@ jobs:
   format:
     runs-on: ubuntu-latest
     steps:
-      - uses: Codecademy/[email protected]
-        with:
-          node-version: 22
-          command: format:verify
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/yarn
+      - run: yarn format:verify
 
   lint:
     strategy:
@@ -16,10 +15,8 @@ jobs:
         command: ['lint', 'verify']
     runs-on: ubuntu-latest
     steps:
-      - uses: Codecademy/[email protected]
-        with:
-          node-version: 22
-          command: build
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/yarn
       - run: yarn ${{ matrix.command }}
 
 on:

.github/workflows/push.yml

@@ -32,6 +32,15 @@ tmp
 .npmrc
 .awcache
 
+# Yarn specific ignores
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
 # Users Environment Variables
 .lock-wscript
 

.gitignore

@@ -10,7 +10,7 @@ export default {
     }
 
     if (micromatch.some(allChanges, 'yarn.lock')) {
-      commands.push(`npx yarn-deduplicate`);
+      commands.push(`yarn dedupe`);
     }
 
     const eslintExtensions = `{mdx,ts,tsx,js,jsx,json}`;

.lintstagedrc.mjs

@@ -0,0 +1,3 @@
+nodeLinker: node-modules
+
+yarnPath: .yarn/releases/yarn-4.9.1.cjs