Command line parsing in typescript

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  // commands.ts
  import {
    command,
    run,
    string,
    positional,
    restPositionals,
    boolean,
    flag,
  } from "cmd-ts";

  const app = command({
    name: "app",
    args: {
      debug: flag({
        long: "debug",
        short: "d",
        type: boolean,
        description: "Enable debug mode",
        defaultValue: () => false,
      }),
      first: positional({ type: string, displayName: "first arg" }),
      rest: restPositionals({ type: string, displayName: "rest" }),
    },
    handler: ({ debug, first, rest }) => {
      console.log({ debug });
      console.log({ first });
      console.log({ rest });
    },
  });

  run(app, process.argv.slice(2));

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  import {
    command,
    run,
    string,
    restPositionals,
    option,
    subcommands,
  } from "cmd-ts";

  const models_list = command({
    name: "list",
    description: "List all models",
    args: {},
    handler: () => {
      console.log("list");
    },
  });

  const models_subcommand = subcommands({
    name: "models",
    description: "Manage models",
    cmds: {
      list: models_list,
    },
  });

  const run_prompt = command({
    name: "run",
    description: "Run a prompt",
    args: {
      model: option({
        long: "model",
        short: "m",
        description: "The model to use",
        defaultValue: () => "gpt-4o",
      }),
      prompt: restPositionals({ type: string, displayName: "prompt" }),
    },
    handler: ({ model, prompt }) => {
      console.log("model", model);
      console.log("prompt", prompt.join(" "));
    },
  });

  const app = subcommands({
    name: "app",
    cmds: { run: run_prompt, models: models_subcommand },
  });

  run(app, process.argv.slice(2)).catch(console.error);