Fix: Handle multiline comments in parseWithComments

This problem was found while using prettier with pragmas enabled and I
backtracked it to the `parseWithComments` function from jest-docblock.
In this context it is especially problematic in cases were the top level
comment is not formatted as a dock lock but a "multi-line comment" to
disable an es-lint rule.

/* eslint-disable @typescript-eslint/unbound-method */

Especially given the fact that the `extract` function seems to handle
this case correctly.

Therefore this solution alters the commentStartRe to keep the second * as
optional. This should ensure that all existing use cases work as expected
with proper docblocks but also ensures that an "invalid" multiline comment
works as well.

Links:
https://github.com/ullumullu/jest/blob/main/packages/jest-docblock/src/__tests__/index.test.ts#L29

packages/jest-docblock/src/__tests__/index.test.ts

@@ -31,6 +31,11 @@ describe('docblock', () => {
     expect(docblock.extract(code)).toBe(`/*${EOL} * @team foo${EOL}*/`);
   });
 
+  it('extracts from invalid docblock singleline', () => {
+    const code = `/* some comment @team foo */${EOL}const x = foo;`;
+    expect(docblock.extract(code)).toBe('/* some comment @team foo */');
+  });
+
   it('returns extract and parsedocblock', () => {
     const code = `/** @provides module-name */${EOL}${EOL}.dummy {}${EOL}`;
 
@@ -204,6 +209,22 @@ describe('docblock', () => {
     });
   });
 
+  it('extract from invalid docblock', () => {
+    const code = `/* @format: everything${EOL}// keep me */`;
+    expect(docblock.parseWithComments(code)).toEqual({
+      comments: '// keep me',
+      pragmas: {'format:': 'everything'},
+    });
+  });
+
+  it('extract from invalid docblock singleline', () => {
+    const code = '/* some test */';
+    expect(docblock.parseWithComments(code)).toEqual({
+      comments: ' some test',
+      pragmas: {},
+    });
+  });
+
   it('extracts docblock comments as CRLF when docblock contains CRLF', () => {
     const code = '/**\r\n * foo\r\n * bar\r\n*/';
     expect(docblock.parseWithComments(code)).toEqual({

packages/jest-docblock/src/index.ts

@@ -11,7 +11,7 @@ import detectNewline = require('detect-newline');
 type Pragmas = Record<string, string | Array<string>>;
 
 const commentEndRe = /\*\/$/;
-const commentStartRe = /^\/\*\*/;
+const commentStartRe = /^\/\*\*?/;
 const docblockRe = /^\s*(\/\*\*?(.|\r?\n)*?\*\/)/;
 const lineCommentRe = /(^|\s+)\/\/([^\r\n]*)/g;
 const ltrimNewlineRe = /^(\r?\n)+/;