@optique/core

[!WARNING] The API is stabilizing, but may change before the 1.0 release.

The core package of Optique which provides the shared types and parser combinators. It is designed to be used in universal JavaScript runtimes, including Node.js, Deno, Bun, edge functions, and web browsers—although you usually won't use it directly in browsers.

[!TIP] Building CLI apps? Consider @optique/run for automatic process.argv handling and process.exit() integration. This core package is perfect for libraries, web apps, or when you need full control over argument parsing.

When to use @optique/core

Use @optique/core instead when:

• Building web applications or libraries
• You need full control over argument sources and error handling
• Working in environments without process (browsers, web workers)
• Building reusable parser components

Use @optique/run when:

• Building CLI applications for Node.js, Bun, or Deno
• You want automatic process.argv parsing and process.exit() handling
• You need automatic terminal capability detection (colors, width)
• You prefer a simple, batteries-included approach

Quick example

import { run } from "@optique/core/facade";
import { object, option, argument } from "@optique/core/parser";
import { string, integer } from "@optique/core/valueparser";
import process from "node:process";

const parser = object({
  name: argument(string()),
  age: option("-a", "--age", integer()),
  verbose: option("-v", "--verbose"),
});

const config = run(parser, "myapp", process.argv.slice(2), {
  help: "both",
  onError: process.exit,
});

console.log(`Hello ${config.name}!`);
if (config.age) console.log(`You are ${config.age} years old.`);
if (config.verbose) console.log("Verbose mode enabled.");

For more resources, see the docs and the examples/ directory.