Feature Request

• I would like to work on this feature!

Is your feature request related to a problem?

Yes, Prettier needs to handle the errors provided by babel-parser in recovery mode, which can be ignored.

The current Prettier hardcodes error messages for this purpose. See https://github.com/prettier/prettier/blob/3995c2a1a1839753e08f0576c4161876bc5ad62e/src/language-js/parser-babel.js#L147-L204. This is not a good. Fixing Babel's error messages may break Prettier.

Context: prettier/prettier#10495 (comment)

Describe the solution you'd like

Introduce error code.

Describe alternatives you've considered.

Continue hardcoding...

Documentation, Adoption, Migration Strategy

I think the following interface looks good.

const { parse } = require("@babel/parser");

const ast = parse("const foo = 1; const foo = 2;", { errorRecovery: true }));

console.log(ast.errors[0].message); //  Identifier 'foo' has already been declared
console.log(ast.errors[0].code); // BABEL_PARSER_SYNTAX_ERROR_001