Bolt

import { Bolt, Crate } from "https://deno.land/x/bolt@0.1.5/src/bolt.ts";

const ddirs: Crate = {
  name: "ddirs",
  // The url of rust crate, this allows user to just import your library for it to work out of the box
  repo: {
    url: "https://github.com/sigmaSd/ddirs2",
    relativePath: "./ddirsRust",
  },
  // Path of a local crate, this allows you as a developer to test your changes locally
  // Url takes precedence over path but if "BOLT" environment variable is set to "dev", path takes precedence (which you should set when developing)
  path: "./ddirsRust",
};

const bolt = new Bolt([ddirs]);
await bolt.init();

const libDdirs = bolt.getLib(ddirs.name);
function config_dir(): string | undefined {
  const dylib = Deno.dlopen(libDdirs, {
    "config_dir": { parameters: [], result: "pointer" },
  });
  const maybeResult = dylib.symbols.config_dir();
  if (maybeResult.valueOf() !== 0n) {
    const result = new Deno.UnsafePointerView(maybeResult);
    return result.getCString();
  } else {
    return undefined;
  }
}

console.log(config_dir());