sucrase/dist/src/transformers/OptionalCatchBindingTransformer.mjs

Super-fast alternative to Babel for when you can target modern JS runtimes

import Transformer from "./Transformer";
export default class OptionalCatchBindingTransformer extends Transformer {
    constructor(tokens, nameManager) {
        super();
        this.tokens = tokens;
        this.nameManager = nameManager;
    }
    process() {
        if (this.tokens.matches(["catch", "{"])) {
            this.tokens.copyToken();
            this.tokens.appendCode(` (${this.nameManager.claimFreeName("e")})`);
        }
        return false;
    }
}