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Swim UI Toolkit

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The Swim UI toolkit implements a massively real-time user interface toolkit. Procedural styling, and a unified view hierarchy, make it easy to consistently animate—and efficiently render—mixed HTML, SVG, and Canvas components, enabling uniform tweening of everything from HTML attributes, to CSS styles, SVG and Canvas drawings, and custom parameters. Swim UI is a part of the Swim System framework.


The Swim UI toolkit consists of the following component libraries:

  • @swim/ui – umbrella package that depends on, and re-exports, all Swim UI libraries.
  • @swim/angle – dimensional angle types with unit-aware algebraic operators, conversions, and parsers.
  • @swim/length – DOM-relative length types with unit-aware algebraic operators, conversions, and parsers.
  • @swim/color – RGB and HSL color types with color-space-aware operators, conversions, and parsers.
  • @swim/font – CSS font property types and parsers.
  • @swim/transform – CSS and SVG compatible transform types with unit-aware algebraic operators and parsers.
  • @swim/interpolate – interpolator types for blending between values, such as numbers, dates, angles, lengths, colors, transforms, shapes, arrays, structures, and other interpolators.
  • @swim/scale – scale types that map numeric and temporal input domains to interpolated output ranges, with support for continuous domain clamping, domain solving, range unscaling, and interpolation between scales.
  • @swim/transition – transition types that specify duration, ease, interpolator, and lifecycle callback parameters for tween animations.
  • @swim/animate – property-managing animator types that efficiently tween values between discrete state changes.
  • @swim/dom – CustomEvent and ResizeObserver polyfills.
  • @swim/style – CSS style types and universal style value parser.
  • @swim/render – renderable graphic types for SVG and Canvas compatible path drawing contexts, and Canvas compatible rendering contexts.
  • @swim/constraint – incremental solver for systems of linear layout constraints.
  • @swim/view – unified HTML, SVG, and Canvas view hierarchy, with integrated controller architecture, animated procedural styling, and constraint-based layouts.
  • @swim/shape – canvas shape views, with animated geometry and style properties.
  • @swim/typeset – canvas typesetting views, with animated text, layout, font, and style properties.
  • @swim/gesture – multitouch gesture recognizers, with kinematic surface modeling.

Swim UI builds on the Swim Core framework; it has no additional dependencies.



For an npm-managed project, npm install @swim/ui to make it a dependency. TypeScript sources will be installed into node_modules/@swim/ui/main. Transpiled JavaScript and TypeScript definition files install into node_modules/@swim/ui/lib/main. And a pre-built UMD script, which bundles all @swim/ui component libraries, can be found in node_modules/@swim/ui/dist/main/swim-ui.js.


Browser applications can load swim-ui.js, along with its swim-core.js dependency, from the Swim CDN.

<script src=""></script>
<script src=""></script>

Alternatively, the standalone swim-system.js script may be loaded from the Swim CDN, which bundles @swim/ui along with all other @swim/system frameworks.

<script src=""></script>



@swim/ui can be imported as an ES6 module from TypeScript and other ES6-compatible environments. All component libraries are re-exported, in their entirety, from the top-level @swim/ui namespace.

import * as swim from "@swim/ui";


@swim/ui can also be used with CommonJS-compatible module systems. All component libraries are re-exported, in their entirety, from the top-level @swim/ui namespace.

var swim = require("@swim/ui");


When loaded by a web browser, the swim-ui.js script adds all component library exports to the global swim namespace. The swim-ui.js script requires that swim-core.js has already been loaded.

The swim-system.js script also adds all @swim/ui component library exports to the global swim namespace, making it a drop-in replacement for swim-ui.js when additional @swim/system frameworks are needed.


Note: swim-ui-js can be built against the currently checked out swim-core-js sources by compiling it from the parent swim-system-js directory.


Install build dependencies:

swim-ui-js $ npm install

Build script

Use the bin/build.js script to build the Swim UI toolkit. The build script supports compile, test, doc, and watch commands, described below. All build script commands take an optional --projects (-p) option to restrict the build to a comma-separated list of projects.

Each project supports multiple output targets; typical targets for a project include main, to build the main sources, and test, to build the test sources. A specific target can be built for a project by appending a colon (:) and the target name to the project name. For example, to build just the main sources of the util project, pass -p util:main to the build script.

Most build commands take a --devel (-d) option to expedite development builds by skipping the minification step.

Run bin/build.js help to see a complete list of build commands. Run bin/build.js <command> --help to see a list of options supported by a particular build command.

Compiling sources

Use the compile build script command to compile, bundle, and minify TypeScript sources into JavaScript universal module definitions, output to the dist subdirectory of each project. To compile all targets, of all projects, run:

swim-ui-js $ bin/build.js compile

To compile a subset of projects and targets, include a --projects (-p) option, with a comma-separated list of $project:($target)? specifiers. For example, to build the main target of the color project, and all targets of the transition project, run:

swim-ui-js $ bin/build.js compile -p color:main,transition

Running tests

Use the test build script command to compile and run unit tests. For example, to compile and test the style project, run:

swim-ui-js $ bin/build.js test -p style

Continuous development builds

Use the watch build script command to automatically rebuild projects when dependent source files change. For example, to continuously recompile the main target of the render project when any source file in the project–or in one of the project's transitive local dependencies–changes, run:

swim-ui-js $ bin/build.js watch -p render:main

Pass the --devel (-d) option to expedite recompilation by skipping the minification step. Add the --test (-t) option to automatically run unit tests after each successful compilation. For example, to continuosly compile and test the font project, bypassing minification, and skipping generation of the main script, run:

swim-ui-js $ bin/build.js watch -p font:test -d -t
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