Unexpected token

[julianjensen]

I'm getting an Unexpected token error when parsing React code where an inline JavaScript expression starts with a /, see below for example. Here's a minimal example with the acorn parser thrown in for comparison.

const test = `const C = props => {
    <Component>
        <div>
            {
                /abc/.test( props.xyz ) || <OtherComponent />
            }
        </div>
    </Component>
}
`;

console.log( `------------------------ ACORN` );
const r1 = AcornParser.parse( test, { sourceType: 'module', ecmaVersion: 2022 });
console.log( r1?.type );
console.log( `------------------------ MERIYAH` );
const r2 = MeriyahParser.parse( test, { module: true, next: true, jsx: true });
console.log( r2?.type );

This produces the following output.

------------------------ ACORN
Program
------------------------ MERIYAH
file:///home/.../project/node_modules/meriyah/dist/meriyah.esm.js:181
    throw new ParseError(parser.index, parser.line, parser.column, type, ...params);
          ^

ParseError [SyntaxError]: [5:17]: Unexpected token: '/'
    at report (file:///home/.../project/node_modules/meriyah/dist/meriyah.esm.js:181:11)
    at parsePrimaryExpression (file:///home/.../project/node_modules/meriyah/dist/meriyah.esm.js:6374:13)
    at parseExpression (file:///home/.../project/node_modules/meriyah/dist/meriyah.esm.js:5802:16)
    at parseJSXExpressionContainer (file:///home/.../project/node_modules/meriyah/dist/meriyah.esm.js:8726:22)
    at parseJSXChild (file:///home/.../project/node_modules/meriyah/dist/meriyah.esm.js:8596:16)
    at parseJSXChildren (file:///home/.../project/node_modules/meriyah/dist/meriyah.esm.js:8588:23)
    at parseJSXRootElementOrFragment (file:///home/.../project/node_modules/meriyah/dist/meriyah.esm.js:8536:20)
    at parseJSXChild (file:///home/.../project/node_modules/meriyah/dist/meriyah.esm.js:8598:16)
    at parseJSXChildren (file:///home/.../project/node_modules/meriyah/dist/meriyah.esm.js:8588:23)
    at parseJSXRootElementOrFragment (file:///home/.../project/node_modules/meriyah/dist/meriyah.esm.js:8536:20) {
  index: 82,
  line: 5,
  column: 17,
  description: "[5:17]: Unexpected token: '/'",
  loc: { line: 5, column: 17 }
}

This is using meriyah version 4.2.0

[3cp]

The tokeniser is not working correctly for jsx, it thought that / is a divide, instead of start of regular expression.

[3cp]

Released v4.2.1.