feat(lint): Implement front matter validator and linter

.github/workflows/markdown-lint-fix.yml

@@ -25,7 +25,9 @@ jobs:
         run: yarn --frozen-lockfile
 
       - name: Lint markdown files
-        run: yarn fix:md
+        run: |
+          yarn fix:md
+          yarn fix:fm
 
       - name: Create PR with only fixable issues
         if: success()

.github/workflows/markdown-lint.yml

@@ -32,3 +32,4 @@ jobs:
         run: |
           echo "::add-matcher::.github/workflows/markdownlint-problem-matcher.json"
           yarn lint:md
+          yarn lint:fm

.github/workflows/pr-check_markdownlint.yml

@@ -43,3 +43,4 @@ jobs:
           echo "::add-matcher::.github/workflows/markdownlint-problem-matcher.json"
           files_to_lint="${{ env.DIFF_DOCUMENTS }}"
           yarn markdownlint-cli2 ${files_to_lint}
+          node scripts/front-matter_linter.js ${files_to_lint}

.lintstagedrc.json

@@ -1,5 +1,8 @@
 {
-  "*": "prettier --ignore-unknown --write",
-  "*.md": "markdownlint-cli2-fix",
+  "!*.md": "prettier --ignore-unknown --write",
+  "*.md": [
+    "markdownlint-cli2-fix",
+    "node scripts/front-matter_linter.js --fix true"
+  ],
   "*.{svg,png,jpeg,jpg,gif}": "yarn filecheck"
 }

.markdownlint-cli2.jsonc

@@ -207,5 +207,5 @@
     }
   },
   "customRules": ["markdownlint-rule-search-replace"],
-  "ignores": ["node_modules", ".github"]
+  "ignores": ["node_modules", ".github", "tests"]
 }