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#esm (4)

Cheat sheets (4)

TypeScript Modules — module, moduleResolution, .mts / .cts

Deep dive into TypeScript's module system — module/moduleResolution pairs, .mts/.cts file extensions, NodeNext vs Bundler resolution, paths, and tsconfig extends.
typescript modules esm nodenext tooling

ts-node, tsx & Friends — Running TypeScript Without a Build Step

Compare ts-node, tsx, Node 22.6+ --experimental-strip-types, Bun, and Deno for running .ts files directly; pick the right tool, configure watch mode, and avoid the classic ESM / type-strip pitfalls.
typescript runtime tooling node esm

JavaScript Modules

CommonJS vs ES Modules in Node.js — syntax, how Node chooses the module system, dynamic import, top-level await, CJS/ESM interop, and common pitfalls.
javascript modules esm commonjs node

Node.js Runtime

How to use the Node.js runtime — REPL, running scripts, CLI flags, ESM vs CJS modules, built-in node: modules, the process object, and modern globals like fetch and structuredClone.
javascript node runtime cli esm cjs modules