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#tooling (21)

Cheat sheets (21)

Biome — One toolchain for lint, format, and import sorting

Rust-based all-in-one linter and formatter for JS/TS/JSON/CSS/GraphQL. Single binary, single config, 10-100x faster than ESLint+Prettier.
javascript biome linting formatting tooling

Bun — All-in-One JavaScript Runtime & Toolkit

Bun is a fast all-in-one JavaScript runtime, package manager, bundler, and test runner written in Zig — a drop-in replacement for Node.js and npm with built-in TypeScript and JSX support.
javascript runtime bun cli typescript tooling

Commander.js — Node.js Command-Line Interfaces

Build full-featured Node.js CLIs with positional arguments, typed options, subcommands, auto-generated help, lifecycle hooks, and a distributable bin in package.json.
javascript node cli commander tooling

Day.js — Tiny, immutable date library

Parse, format, manipulate, compare, and convert timezones for dates in JavaScript using Day.js — a 2 kB Moment-compatible alternative with a plugin-based architecture.
javascript dates time library tooling

Deno — Secure JavaScript & TypeScript Runtime

Deno is a secure, modern JavaScript and TypeScript runtime built on V8 with permission-based sandboxing, built-in TypeScript, a curated standard library on JSR, and a complete toolchain (fmt, lint, test, bench, compile).
javascript runtime deno typescript cli tooling

shellcheck — Shell Script Linter

Catch quoting bugs, missing checks, and POSIX portability mistakes in shell scripts. Covers every flag, severity levels, inline directives, CI/pre-commit integration, and the most common rules.
shellcheck shell scripting linting bash cli tooling web-researched

argparse — Stdlib CLI Argument Parser

Parse command-line arguments with Python's stdlib argparse module. Covers positional/optional args, subparsers, nargs, validation, mutually exclusive groups, FileType, env-var fallbacks, and argcomplete.
python stdlib cli scripting tooling

pdb — Python Debugger

Pause, inspect, and step through Python programs with pdb. Covers breakpoint(), command reference, post-mortem debugging, conditional breakpoints, and enhanced alternatives like ipdb, pdbpp, and pudb.
python pdb debugging stdlib repl tooling

pre-commit — Git Hooks for Linters and Formatters

Run linters, formatters, and validators automatically on every git commit. Covers .pre-commit-config.yaml, essential hooks (ruff, mypy, check-yaml), autoupdate, and CI integration.
python pre-commit git-hooks workflow ci code-quality tooling

TypeScript Project References — Composite Builds & Monorepos

Split a TypeScript codebase into composite sub-projects, build them incrementally in dependency order with tsc --build, and integrate the result with bundlers, Turborepo, and Nx.
typescript build monorepo tooling tsconfig

TypeScript Compiler API — Codegen, codemods, and AST walks

Drive the TypeScript compiler programmatically — parse SourceFiles, query the type checker, transform ASTs with the factory, and write codemods that scale across a monorepo.
typescript tooling advanced compiler codegen

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

type-fest — Community utility types for TypeScript

Sindre Sorhus's collection of essential TypeScript utility types — PartialDeep, ReadonlyDeep, SetOptional, RequireAtLeastOne, Merge, Tagged, JsonValue, Opaque, and dozens more — so you don't hand-roll them.
typescript library utility-types tooling

diff2html-cli — Beautiful HTML Diffs from the Terminal

Convert unified diffs and git diff output into styled HTML side-by-side or line-by-line diff views from the command line.
diff html cli tooling

ESLint

The standard JavaScript/TypeScript linter. Covers flat config (v9), legacy .eslintrc, running, rules, plugins, TypeScript integration, VS Code, and pre-commit hooks.
javascript eslint linting tooling

Prettier

Opinionated code formatter for JS/TS/CSS/HTML/JSON/Markdown. Covers config options, .prettierignore, VS Code integration, ESLint compatibility, lint-staged, and CI usage.
javascript prettier formatting tooling

Vite

Next-generation frontend build tool using native ES modules for near-instant dev server startup and Rollup for production bundles. Covers setup, config, HMR, env vars, assets, CSS, and plugins.
javascript vite build bundler tooling

Vitest

Vite-native unit test framework with a Jest-compatible API. Covers setup, writing tests, matchers, mocking, timers, async testing, coverage, and UI mode.
javascript vitest testing tooling

TypeScript Installation & Running

Install the TypeScript compiler, run .ts files without a build step using ts-node or tsx, and compile projects with tsc. Covers tsc flags, watch mode, and project references.
typescript installation tsc tooling

tsconfig.json Reference

Complete reference for tsconfig.json — compiler options for type checking, module resolution, output, paths, and JSX. Includes ready-to-use presets for Node 20, browser libraries, and Vite/React apps.
typescript tsconfig compiler tooling