import { DefaultMap } from "./util.js";

const mapping = new DefaultMap(() => new Map());

export const getFnType = (inType, outType) => {
  const m2 = mapping.getdefault(inType);
  if (m2.has(outType)) {
    return m2.get(outType);
  }
  else {
    const fnType = {in: inType, out: outType};
    m2.set(outType, fnType);
    return fnType;
  }
}