instead of function.sent, what if GeneratorPrototype.bindFirstNextToFirstArgument:

const GeneratorProto = Object.getPrototypeOf(function*(){});

GeneratorProto.bindFirstNextToFirstArgument = function () {
  const genFn = this;
  return function (...args) {
    let realGen = null;

    return {
      next(value) {
        if (realGen === null) {
          realGen = genFn(value, ...args);
          return realGen.next();
        }
        return realGen.next(value);
      },
      return(value) {
        return (realGen ??= genFn(undefined, ...args)).return(value);
      },
      throw(err) {
        return (realGen ??= genFn(undefined, ...args)).throw(err);
      },
      [Symbol.iterator]() {
        return this;
      },
    };
  };
};

// usage
let wrapped = (function* (sent, x, y) {
  console.log(x, y, sent);
  yield 0;
}).bindFirstNextToFirstArgument();

let gen = wrapped(1, 2);
let rv = gen.next('first'); // prints 1, 2, 'first'
console.log(rv.value); // prints 0