create helix configuration with typescript

helix.ts

import { stringify } from "https://deno.land/[email protected]/encoding/toml.ts";
import { ensureDir } from "https://deno.land/[email protected]/fs/ensure_dir.ts";
import * as path from "https://deno.land/[email protected]/path/mod.ts";
import configDir from "https://deno.land/x/[email protected]/config_dir/mod.ts";

function assert(val: unknown, msg: string): asserts val {
  if (val === null || val === undefined) throw new Error(msg);
}

async function main() {
  const configDirPath = (() => {
    const configPath = configDir();
    assert(configPath, "Could not find configuration directory");
    return path.join(configPath, "helix");
  })();
  await ensureDir(configDirPath);

  const configRaw = Deno.args[0];
  if (!configRaw) throw "no script given";
  let config: URL;
  try {
    // If its a url leave it like it is
    config = new URL(configRaw);
  } catch {
    // Otherwise consider it a file and resolve it
    let configFile: string;
    if (path.isAbsolute(configRaw)) configFile = configRaw;
    else {
      configFile = path.join(Deno.cwd(), configRaw);
    }
    // Make it a url so it can be imported
    config = new URL("file:///" + configFile);
  }

  const jsConfig = await import(config.href);

  const configToml = stringify(jsConfig.config());
  console.log(`%cConfig.toml`, "color:blue");
  console.log(configToml);

  const languagesToml = stringify(jsConfig.languages());
  console.log(`%clanguages.toml`, "color:blue");
  console.log(languagesToml);

  if (Deno.args.includes("--save")) {
    console.log(
      `%cSaving new configuration to ${configDirPath}`,
      "color: yellow",
    );
    await Deno.writeTextFile(
      path.join(configDirPath, "config.toml"),
      configToml,
    );
    await Deno.writeTextFile(
      path.join(configDirPath, "languages.toml"),
      languagesToml,
    );
  }
}

if (import.meta.main) {
  await main();
}