RunTime-Now 2.0.0

The biggest release so far: rtn now runs npm packages, CommonJS code and your tests.

• npm packages: imports and require() resolve through node_modules with package.json "exports" (subpaths, * patterns, conditions), "imports" (#internal), "main", scoped packages and nested node_modules. Checked with lodash, zod, dayjs, chalk 5, date-fns, uuid, nanoid, yaml, semver, picocolors, ms, kleur, mitt and eventemitter3.
• CommonJS: require(), module.exports, __dirname / __filename, require.resolve / cache / main, createRequire(), .cjs / .cts files and CommonJS entry points. ES modules import CommonJS (module.exports = default export, its properties = named exports), and require() loads ES modules without top-level await.
• Node built-in modules: Buffer / node:buffer, node:events (EventEmitter), node:util, node:assert (+ assert/strict), node:os, node:url, node:crypto (createHash/createHmac with sha256, sha1, md5, randomBytes, randomInt, …), node:timers (+ timers/promises), node:module, node:tty, node:process; crypto.subtle.digest. All built-ins work with or without node:. tests/cases/node-compat.mjs prints exactly what Node 22 prints.
• rtn test: a built-in test runner with the Jest/Bun API — describe / test / it, .skip / .only / .todo / .each, hooks, async and done tests, timeouts, 30+ expect matchers, .resolves / .rejects, asymmetric matchers, mock() and spyOn(). Calm black/white/blue output, exit code 1 on failure.
• rtn init: creates a TypeScript project that runs and tests out of the box.
• Faster startup: the built-in JavaScript is compiled to QuickJS bytecode at build time — rtn -e 0 takes ~6 ms (1.6: ~10 ms) even though rtn has ~4,000 more lines of built-in JS.
• process is an EventEmitter (process.on("exit")), plus process.emitWarning, global, setImmediate / clearImmediate.
• console.log shows deep objects like Node ([Map], [MyClass] instead of [Object]).

Breaking changes

• process.version now reports the Node version whose APIs rtn follows (v22.12.0) and process.versions.node exists, so npm packages take their Node code paths. rtn's own version: process.versions.rtn or rtn.version.
• A .js / .ts file that uses require() / module.exports and no import / export now runs as CommonJS (previously always an ES module).
• Bare specifiers (import x from "pkg") now resolve npm packages instead of throwing; fs, path, events… without node: are the built-in modules.

Install

curl -fsSL https://byteforgestudiolab.github.io/RunTime-Now/install | bash

Already installed? Run rtn upgrade.