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Run JavaScript tests with built-in assertions and mocks for checking code behavior and dependency interactions.

Use a reactive document database and JavaScript query functions in a TypeScript backend.

Map twelve-step colour scales to interface roles and light or dark themes.

Parse CSS colour strings and build adjusted values in JavaScript.

A JavaScript font-reading, conversion and glyph-editing library.

An approachable JavaScript framework for building interactive user interfaces.

A free icon family with framework packages and a searchable JavaScript API.

One JavaScript and TypeScript test runner for browser, mobile, desktop, and extension workflows.

Highlight code with TextMate grammars and themes in a JavaScript rendering pipeline.

Build native desktop applications with a Go backend and a web-technology frontend.

Build native mobile interfaces with React components and a shared JavaScript or TypeScript application.

A mobile code editor for editing web and source files, previewing pages and using terminal or remote-file tools.

Interactive JavaScript study with projects and challenges

A programming book with language lessons and projects

Derive page backgrounds and gradients from the images they surround.

A JavaScript learning book with an online reading version

Use colour schemes and colour-space operations in D3 projects.

Convert colour values and collect palettes for design or code.

Outlined, filled and two-tone SVG icons for application interfaces.

Currency artwork with SVG, raster sizes and a machine-readable manifest.

Define JavaScript and TypeScript schemas that validate data and infer its types.

Unicode emoji artwork with a JavaScript text-to-image parser.

Install Node.js project dependencies with a package manager built for efficient storage and workspaces.

Format and lint web-project files with a shared command-line toolchain.