Merge branch '5.4'

diff --cc .github/workflows/codestyle.yml
Simple merge

diff --cc .github/workflows/typescript.yml
index eca73057ffd72a8645b65b071b69b0e57c9dcb5c,22829f0bc1f35606e9d6ba9b5fb42e8f9987ce73..fcb6ebb96b893f0ec5252ed76ad208fec236ac49
--- 1/.github/workflows/typescript.yml
--- 2/.github/workflows/typescript.yml
+++ b/.github/workflows/typescript.yml
@@@ -18,8 -17,8 +18,8 @@@ jobs
      - name: Set up node.js
        uses: actions/setup-node@v2
        with:
-         node-version: "14"
+         node-version: "16"
 -    - uses: actions/checkout@v2
 +        cache: "npm"
      - run: npm install
      - run: npx tsc --noEmit
      - name: Check that tslib is in sync.
@@@ -34,8 -32,8 +34,8 @@@
      - name: Set up node.js
        uses: actions/setup-node@v2
        with:
-         node-version: "14"
+         node-version: "16"
 -    - uses: actions/checkout@v2
 +        cache: "npm"
      - run: npm install
      - run: npx eslint .
    javascript_sync:
@@@ -49,8 -46,8 +49,8 @@@
      - name: Set up node.js
        uses: actions/setup-node@v2
        with:
-         node-version: "14"
+         node-version: "16"
 -    - uses: actions/checkout@v2
 +        cache: "npm"
      - run: npm install
      - run: npx tsc
      - run: echo "::add-matcher::.github/diff.json"