chore(dependabot): ignore prettier v3 (#4387)

* chore(dependabot): ignore prettier v3

* chore(prettier): prepare for v3

use v2 value for trailingComma

add note to places that will need updates

* chore(dependabot): add issue number for prettier TODO

.github/dependabot.yml

@@ -18,3 +18,8 @@ updates:
           # We are pinned to Tachometer 0.5.10 due to a breaking change in 0.6.0.
           # See: https://github.com/google/tachometer/issues/244
           - dependency-name: 'tachometer'
+          # TODO [#4386]: Stop ignoring when we've done the upgrade ourselves
+          - dependency-name: 'prettier'
+            versions: '>= 3'
+          - dependency-name: '@types/prettier'
+            versions: '>= 3'

.prettierrc

@@ -1,5 +1,6 @@
 {
     "printWidth": 100,
     "singleQuote": true,
-    "tabWidth": 4
+    "tabWidth": 4,
+    "trailingComma": "es5"
 }

packages/@lwc/template-compiler/src/__tests__/fixtures.spec.ts

@@ -38,6 +38,7 @@ describe('fixtures', () => {
             );
 
             return {
+                // TODO [#4386]: Prettier v3 returns a promise - add an `await` here
                 'expected.js': prettier.format(code, { parser: 'babel' }),
                 'ast.json': JSON.stringify({ root }, null, 4),
                 'metadata.json': JSON.stringify({ warnings }, null, 4),

scripts/tasks/generate-license-files.js

@@ -60,6 +60,7 @@ async function main() {
             '\n'
         )}`.trim() + '\n';
 
+    // TODO [#4386]: Prettier v3 returns a promise - add an `await` here
     const formattedLicense = prettier.format(newLicense, {
         parser: 'markdown',
     });