feat(lint): Implement front matter validator and linter (#26410)

* feat(lint): Implement front matter validator and linter

* run unit tests on commit

* Use 'anyOf' in schema and add to unit tests

* Fix some content pages

.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 +43,5 @@ jobs:
           echo "::add-matcher::.github/workflows/markdownlint-problem-matcher.json"
           files_to_lint="${{ env.DIFF_DOCUMENTS }}"
           yarn markdownlint-cli2 ${files_to_lint}
+          echo "Linting front-matter"
+          node scripts/front-matter_linter.js ${files_to_lint}

.lintstagedrc.json

@@ -1,5 +1,9 @@
 {
-  "*": "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"
+  ],
+  "tests/**/*.*": "yarn test:front-matter-linter",
   "*.{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"]
 }

files/en-us/glossary/index.md

@@ -1,7 +1,7 @@
 ---
 title: "MDN Web Docs Glossary: Definitions of Web-related terms"
 slug: Glossary
-page-type: glossary-definition
+page-type: landing-page
 ---
 
 Web technologies contain long lists of jargon and abbreviations that are used in documentation and coding. This glossary provides definitions of words and abbreviations you need to know to successfully understand and build for the web.

files/en-us/web/api/window/webkitconvertpointfrompagetonode/index.md

@@ -4,8 +4,8 @@ short-title: webkitConvertPointFromPageToNode()
 slug: Web/API/Window/webkitConvertPointFromPageToNode
 page-type: web-api-instance-method
 status:
-  - non-standard
   - deprecated
+  - non-standard
 browser-compat: api.Window.webkitConvertPointFromPageToNode
 ---
 

files/en-us/web/css/css_scrollbars/index.md

@@ -2,10 +2,10 @@
 title: CSS scrollbars styling
 slug: Web/CSS/CSS_Scrollbars
 page-type: css-module
-spec-urls: https://w3c.github.io/csswg-drafts/css-scrollbars/
 browser-compat:
   - css.properties.scrollbar-color
   - css.properties.scrollbar-width
+spec-urls: https://w3c.github.io/csswg-drafts/css-scrollbars/
 ---
 
 {{CSSRef}}{{SeeCompatTable}}