1 files changed, 99 insertions, 0 deletions
diff --git a/remote/test/puppeteer/tools/eslint/src/prettier-comments.js b/remote/test/puppeteer/tools/eslint/src/prettier-comments.js
new file mode 100644
index 0000000000..3cbaad2909
--- /dev/null
+++ b/remote/test/puppeteer/tools/eslint/src/prettier-comments.js
@@ -0,0 +1,99 @@
+/**
+ * @license
+ * Copyright 2023 Google Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+// @ts-nocheck
+// TODO: We should convert this to types.
+
+const prettier = require('@prettier/sync');
+
+const prettierConfigPath = '../../../.prettierrc.cjs';
+const prettierConfig = require(prettierConfigPath);
+
+const cleanupBlockComment = value => {
+  return value
+    .trim()
+    .split('\n')
+    .map(value => {
+      value = value.trim();
+      if (value.startsWith('*')) {
+        value = value.slice(1);
+        if (value.startsWith(' ')) {
+          value = value.slice(1);
+        }
+      }
+      return value.trimEnd();
+    })
+    .join('\n')
+    .trim();
+};
+
+const format = (value, offset) => {
+  return prettier
+    .format(value, {
+      ...prettierConfig,
+      parser: 'markdown',
+      // This is the print width minus 3 (the length of ` * `) and the offset.
+      printWidth: 80 - (offset + 3),
+    })
+    .trim();
+};
+
+const buildBlockComment = (value, offset) => {
+  const spaces = ' '.repeat(offset);
+  const lines = value.split('\n').map(line => {
+    return ` * ${line}`;
+  });
+  lines.unshift('/**');
+  lines.push(' */');
+  lines.forEach((line, i) => {
+    lines[i] = `${spaces}${line}`;
+  });
+  return lines.join('\n');
+};
+
+/**
+ * @type import("eslint").Rule.RuleModule
+ */
+const prettierCommentsRule = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'Enforce Prettier formatting on comments',
+      recommended: false,
+    },
+    fixable: 'code',
+    schema: [],
+    messages: {},
+  },
+
+  create(context) {
+    for (const comment of context.sourceCode.getAllComments()) {
+      switch (comment.type) {
+        case 'Block': {
+          const offset = comment.loc.start.column;
+          const value = cleanupBlockComment(comment.value);
+          const formattedValue = format(value, offset);
+          if (formattedValue !== value) {
+            context.report({
+              node: comment,
+              message: `Comment is not formatted correctly.`,
+              fix(fixer) {
+                return fixer.replaceText(
+                  comment,
+                  buildBlockComment(formattedValue, offset).trimStart()
+                );
+              },
+            });
+          }
+          break;
+        }
+      }
+    }
+    return {};
+  },
+};
+
+module.exports = prettierCommentsRule;