How to use the @webassemblyjs/helper-wasm-bytecode.valtypesByString function in @webassemblyjs/helper-wasm-bytecode

export function encodeValtype(v) {
  var byte = constants.valtypesByString[v];

  if (typeof byte === "undefined") {
    throw new Error("Unknown valtype: " + v);
  }

  return parseInt(byte, 10);
}
export function encodeMutability(v) {

export function encodeValtype(v: Valtype): Byte {
  const byte = constants.valtypesByString[v];

  if (typeof byte === "undefined") {
    throw new Error("Unknown valtype: " + v);
  }

  return parseInt(byte, 10);
}

export function encodeValtype(v) {
  var byte = constants.valtypesByString[v];

  if (typeof byte === "undefined") {
    throw new Error("Unknown valtype: " + v);
  }

  return parseInt(byte, 10);
}
export function encodeMutability(v) {