--- .github/workflows/reusable-phpstan-static-analysis.yml	2026-02-27 14:51:55
+++ .github/workflows/reusable-javascript-type-checking.yml	2026-03-03 12:50:29
@@ -1,38 +1,31 @@
 ##
-# A reusable workflow that runs PHP Static Analysis tests.
+# A reusable workflow that runs JavaScript Type Checking.
 ##
-name: PHP Static Analysis
+name: JavaScript Type Checking
 
 on:
   workflow_call:
-    inputs:
-      php-version:
-        description: 'The PHP version to use.'
-        required: false
-        type: 'string'
-        default: 'latest'
 
 # Disable permissions for all available scopes by default.
 # Any needed permissions should be configured at the job level.
 permissions: {}
 
 jobs:
-  # Runs PHP static analysis tests.
+  # Runs JavaScript type checking.
   #
   # Violations are reported inline with annotations.
   #
   # Performs the following steps:
   # - Checks out the repository.
-  # - Sets up PHP.
+  # - Sets up Node.js.
   # - Logs debug information.
-  # - Installs Composer dependencies.
-  # - Configures caching for PHP static analysis scans.
-  # - Make Composer packages available globally.
-  # - Runs PHPStan static analysis (with Pull Request annotations).
-  # - Saves the PHPStan result cache.
+  # - Installs npm dependencies.
+  # - Configures caching for TypeScript build info.
+  # - Runs JavaScript type checking.
+  # - Saves the TypeScript build info.
   # - Ensures version-controlled files are not modified or deleted.
-  phpstan:
-    name: Run PHP static analysis
+  typecheck:
+    name: Run JavaScript type checking
     runs-on: ubuntu-24.04
     permissions:
       contents: read
@@ -51,59 +44,33 @@
           node-version-file: '.nvmrc'
           cache: npm
 
-      - name: Set up PHP
-        uses: shivammathur/setup-php@20529878ed81ef8e78ddf08b480401e6101a850f # v2.35.3
-        with:
-          php-version: ${{ inputs.php-version }}
-          coverage: none
-          tools: cs2pr
-
-      # This date is used to ensure that the Composer cache is cleared at least once every week.
-      # http://man7.org/linux/man-pages/man1/date.1.html
-      - name: "Get last Monday's date"
-        id: get-date
-        run: echo "date=$(/bin/date -u --date='last Mon' "+%F")" >> "$GITHUB_OUTPUT"
-
-      - name: General debug information
+      - name: Log debug information
         run: |
           npm --version
           node --version
-          composer --version
 
-      # Since Composer dependencies are installed using `composer update` and no lock file is in version control,
-      # passing a custom cache suffix ensures that the cache is flushed at least once per week.
-      - name: Install Composer dependencies
-        uses: ramsey/composer-install@3cf229dc2919194e9e36783941438d17239e8520 # v3.1.1
-        with:
-          custom-cache-suffix: ${{ steps.get-date.outputs.date }}
-
-      - name: Make Composer packages available globally
-        run: echo "${PWD}/vendor/bin" >> "$GITHUB_PATH"
-
       - name: Install npm dependencies
         run: npm ci --ignore-scripts
 
-      - name: Build WordPress
-        run: npm run build:dev
-
-      - name: Cache PHP Static Analysis scan cache
+      - name: Cache TypeScript build info
         uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
         with:
-          path: .cache # This is defined in the base.neon file.
-          key: "phpstan-result-cache-${{ github.run_id }}"
+          path: |
+            *.tsbuildinfo
+          key: "ts-build-info-${{ github.run_id }}"
           restore-keys: |
-            phpstan-result-cache-
+            ts-build-info-
 
-      - name: Run PHP static analysis tests
-        id: phpstan
-        run: composer run phpstan -- -vvv --error-format=checkstyle | cs2pr --errors-as-warnings --graceful-warnings
+      - name: Run JavaScript type checking
+        run: npm run typecheck:js
 
       - name: "Save result cache"
         uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
         if: ${{ !cancelled() }}
         with:
-          path: .cache
-          key: "phpstan-result-cache-${{ github.run_id }}"
+          path: |
+            *.tsbuildinfo
+          key: "ts-build-info-${{ github.run_id }}"
 
       - name: Ensure version-controlled files are not modified or deleted
         run: git diff --exit-code

--- .github/workflows/phpstan-static-analysis.yml	2026-03-03 13:01:11
+++ .github/workflows/javascript-type-checking.yml	2026-03-03 12:50:49
@@ -1,7 +1,7 @@
-name: PHPStan Static Analysis
+name: JavaScript Type Checking
 
 on:
-  # PHPStan testing was introduced in 7.0.0.
+  # JavaScript type checking was introduced in 7.0.0.
   push:
     branches:
       - trunk
@@ -14,17 +14,18 @@
       - trunk
       - '[7-9].[0-9]'
     paths:
-      # This workflow only scans PHP files.
-      - '**.php'
-      # These files configure Composer. Changes could affect the outcome.
-      - 'composer.*'
-      # These files configure PHPStan. Changes could affect the outcome.
-      - 'phpstan.neon.dist'
-      - 'tests/phpstan/base.neon'
-      - 'tests/phpstan/baseline.php'
+      # This workflow only scans JavaScript files.
+      - '**.js'
+      # These files configure npm. Changes could affect the outcome.
+      - 'package*.json'
+      - '.nvmrc'
+      # This file configures TypeScript. Changes could affect the outcome.
+      - 'tsconfig.json'
+      # This directory contains TypeScript definitions. Changes could affect the outcome.
+      - 'typings/**'
       # Confirm any changes to relevant workflow files.
-      - '.github/workflows/phpstan-static-analysis.yml'
-      - '.github/workflows/reusable-phpstan-static-analysis.yml'
+      - '.github/workflows/javascript-type-checking.yml'
+      - '.github/workflows/reusable-javascript-type-checking.yml'
   workflow_dispatch:
 
 # Cancels all previous workflow runs for pull requests that have not completed.
@@ -39,10 +40,10 @@
 permissions: {}
 
 jobs:
-  # Runs PHPStan Static Analysis.
-  phpstan:
-    name: PHP static analysis
-    uses: ./.github/workflows/reusable-phpstan-static-analysis.yml
+  # Runs JavaScript type checking.
+  typecheck:
+    name: JavaScript type checking
+    uses: ./.github/workflows/reusable-javascript-type-checking.yml
     permissions:
       contents: read
     if: ${{ github.repository == 'WordPress/wordpress-develop' || ( github.event_name == 'pull_request' && github.actor != 'dependabot[bot]' ) }}
@@ -53,7 +54,7 @@
     permissions:
       actions: read
       contents: read
-    needs: [ phpstan ]
+    needs: [ typecheck ]
     if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name != 'pull_request' && always() }}
     with:
       calling_status: ${{ contains( needs.*.result, 'cancelled' ) && 'cancelled' || contains( needs.*.result, 'failure' ) && 'failure' || 'success' }}