Bug 1782273 - Part 30: Enable prettier for selfhosted code. r=tcampbell,Standard8

Differential Revision: https://phabricator.services.mozilla.com/D153263

.prettierignore

@@ -41,9 +41,6 @@ dom/security/test/sri/script*
 dom/base/test/file_bug687859-charset.js
 dom/base/test/file_bug687859-inherit.js
 
-# Ignore preprocessed files.
-js/src/builtin/**/*.js
-
 # Ignore devtools debugger files
 # Keep in sync with devtools/client/debugger/.prettierignore
 devtools/client/debugger/src/workers/parser/tests/fixtures/functionNames.js

tools/lint/eslint/eslint-plugin-spidermonkey-js/lib/processors/self-hosted.js

@@ -30,7 +30,9 @@ module.exports = {
       }
 
       for (; i < lines.length; i++) {
-        lines[i] = "// " + lines[i];
+        // The macro isn't correctly indented, so we need to instruct
+        // prettier to ignore them.
+        lines[i] = "// eslint-disable-line prettier/prettier -- " + lines[i];
 
         // If the line ends with a backslash (\), the next line
         // is also part of part of the macro.