Add Prettier

.agents/skills/translate/SKILL.md

@@ -37,8 +37,10 @@ Check these three things. If any fails, stop and ask.
 - `i18n/` is not in `.gitignore`.
 - `glossary.yml` and `translation-rules.yml` are valid YAML.
 
-Translate the English page as it is on disk after any fixes and after
-Prettier has run, so the hash you record matches what you translated.
+Translate the English page exactly as it is on disk, so the hash you record
+matches what you translated. Do not reformat it; English changes belong in
+their own PR. After writing the translation, run
+`yarn prettier --write <files>` on only the files you changed under `i18n/`.
 
 ## Front matter
 

.agents/skills/update-content/SKILL.md

@@ -32,8 +32,9 @@ Change docs pages and open a PR.
 ## Finish
 
 Stop when you are done or reach 20 changed files. If work is left, list it in
-the PR for the next run. Run Prettier on the files you changed, then build the
-site as CI does, which fails on broken links:
+the PR for the next run. Format the files you changed with
+`yarn prettier --write <files>`, then build the site as CI does, which fails on
+broken links:
 
 ```bash
 yarn generate-library

.prettierignore

@@ -0,0 +1,11 @@
+# Prettier also reads .gitignore, so only list what is committed but must not be reformatted.
+.yarn/
+yarn.lock
+adaptors/library/
+generate-library/master.temp.json
+versioned_docs/
+versioned_sidebars/
+static/
+# Human-maintained; a reformat commit would mark every machine translation stale.
+glossary.yml
+translation-rules.yml

package.json

@@ -65,6 +65,7 @@
     "@types/react-router-dom": "^5.1.7",
     "chokidar": "^3.6.0",
     "glob": "^11.1.0",
+    "prettier": "3.9.9",
     "typescript": "~5.2.2"
   },
   "resolutions": {

yarn.lock

@@ -5168,6 +5168,7 @@ __metadata:
     form-data: 4.0.6
     glob: ^11.1.0
     mermaid: 11.16.1
+    prettier: 3.9.9
     prism-react-renderer: ^2.1.0
     raw-loader: ^4.0.2
     react: ^18.2.0
@@ -14056,6 +14057,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"prettier@npm:3.9.9":
+  version: 3.9.9
+  resolution: "prettier@npm:3.9.9"
+  bin:
+    prettier: bin/prettier.cjs
+  checksum: fbd41978e758c07ce493728c73c9011400446281aca707024e58f7b6ea5ad1dd2f12f8cc51ff76ceb7c7749947db876f6074030a5ec333d8e4084c29455ea948
+  languageName: node
+  linkType: hard
+
 "pretty-error@npm:^4.0.0":
   version: 4.0.0
   resolution: "pretty-error@npm:4.0.0"