Script to convert a candid file to JS IDL using a canister

candidToJS.js

import { IDL } from "@dfinity/candid";
import { Actor, HttpAgent } from "@dfinity/agent";

export const candidToJS = async (candid_source: string) => {
  // call didjs canister
  const didjs_interface: IDL.InterfaceFactory = ({ IDL }) =>
    IDL.Service({
      did_to_js: IDL.Func([IDL.Text], [IDL.Opt(IDL.Text)], ["query"]),
    });

  const candidCanister = `a4gq6-oaaaa-aaaab-qaa4q-cai`;

  const agent = new HttpAgent({ host: "https://icp-api.io" });

  const didjs = Actor.createActor(didjs_interface, {
    agent,
    canisterId: candidCanister,
  });
  const js: any = await didjs.did_to_js(candid_source);
  if (Array.isArray(js) && js.length === 0) {
    return undefined;
  }
  return js[0];
};