@philpl/buble/src/utils/checkConst.js

The blazing fast, batteries-included ES2015 compiler

import CompileError from './CompileError.js';

export default function checkConst(identifier, scope) {
	const declaration = scope.findDeclaration(identifier.name);
	if (declaration && declaration.kind === 'const') {
		throw new CompileError(`${identifier.name} is read-only`, identifier);
	}
}