feat: add @editorjs/header as a git submodule

Submodule keeps header in its own repo while letting it pull model/sdk/dom-adapters as workspace:^ deps during development, without needing them published first.

CI now checks out submodules on every job that runs yarn install, since it needs packages/tools/header populated to resolve the workspace.

The base-coverage action re-checks out the PR's base ref mid-job to compare coverage; git leaves an already-initialized submodule's working directory in place when switching to a ref that doesn't have that path, and the packages/tools/* workspace glob then treats the orphaned header directory as a workspace against a lockfile that has none of its dependencies, so yarn's immutable install fails. Deinit submodules before that checkout so the base-ref install only sees what's actually on that ref.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0149uKB589N5qx9zXYLPVSQw

Author: Reversean

.github/actions/base-coverage/action.yml

@@ -11,6 +11,10 @@ inputs:
 runs:
   using: "composite"
   steps:
+    - name: Deinit submodules before comparing against base ref
+      shell: bash
+      run: git submodule deinit --all -f
+
     - name: Checkout base ref
       uses: actions/checkout@v6
       with:

.github/workflows/bold.yml

@@ -12,6 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Run ESLint check
         uses: ./.github/actions/lint
         with:
@@ -21,6 +23,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Build the package
         uses: ./.github/actions/build
         with:

.github/workflows/italic.yml

@@ -12,6 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Run ESLint check
         uses: ./.github/actions/lint
         with:
@@ -21,6 +23,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Build the package
         uses: ./.github/actions/build
         with:

.github/workflows/link.yml

@@ -12,6 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Run ESLint check
         uses: ./.github/actions/lint
         with:
@@ -21,6 +23,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Build the package
         uses: ./.github/actions/build
         with:

.github/workflows/npm-publish.yml

@@ -21,6 +21,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
 
       - uses: actions/setup-node@v6
         with:

.github/workflows/package-check.yml

@@ -34,6 +34,7 @@ jobs:
       - uses: actions/checkout@v6
         with:
           fetch-depth: 0
+          submodules: true
 
       - name: Determine if CI should run
         id: check
@@ -57,6 +58,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Run ESLint check
         uses: ./.github/actions/lint
         with:
@@ -68,6 +71,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
 
       - name: Run unit tests
         uses: ./.github/actions/unit-tests
@@ -81,6 +86,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Build the package
         uses: ./.github/actions/build
         with:
@@ -92,6 +99,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
 
       - name: Run mutation tests for changed files
         if: ${{ github.event_name == 'pull_request' }}

.github/workflows/paragraph.yml

@@ -12,6 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Run ESLint check
         uses: ./.github/actions/lint
         with:
@@ -21,6 +23,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Build the package
         uses: ./.github/actions/build
         with:

.github/workflows/playground.yml

@@ -12,6 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Run ESLint check
         uses: ./.github/actions/lint
         with:
@@ -21,6 +23,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Build the package
         uses: ./.github/actions/build
         with:

.github/workflows/sdk.yml

@@ -11,6 +11,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Run ESLint check
         uses: ./.github/actions/lint
         with:
@@ -20,6 +22,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
+        with:
+          submodules: true
       - name: Build the package
         uses: ./.github/actions/build
         with:

.gitmodules

@@ -0,0 +1,4 @@
+[submodule "packages/tools/header"]
+	path = packages/tools/header
+	url = https://github.com/editor-js/header.git
+	branch = feat/sdk-v3-migration