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Programming language: TypeScript
License: MIT License
Tags: Command Line Apps    
Latest version: v4.0.2

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themer takes a set of colors and generates editor themes, terminal themes, themes for other apps, and desktop/device wallpapers.

visual description

Table of Contents

Support themer


Don't love the command-line? Check out the Web UI.

mkdir my-dotfiles && cd my-dotfiles
npm install themer

If you do not keep your dotfiles under version control, you can simply install themer globally with npm -g install themer.

themer can also be used without installing, via npxโ€”see example below.


Pass themer a color set, as many templates as you wish, and an output directory.

themer \
  --colors <npm package name OR file> \
  --template <npm package name OR file> \
  [--template <npm package name OR file>...] \
  --out <directory>

Your generated theme files, as well as a README on how to install them, will be written to the output directory.

themer can create themes from your custom color sets (see "Create your own color set" below) or from color sets published on npm (see @themerdev/colors-default). The same is true for templates.

Example workflow

Say you wanted to generate a vim theme and desktop background using themer's default color set. First, install themer, the color set, and the templates:

cd my-dotfiles
npm install themer @themerdev/colors-default @themerdev/vim @themerdev/wallpaper-block-wave

Then edit your package.json:

  "scripts": {
    "build": "themer -c @themerdev/colors-default -t @themerdev/vim -t @themerdev/wallpaper-block-wave -o gen"

Then run your new script:

npm run build

Now check the gen/ folder for your generated themes. Here's the result:

example usage result

Example usage with npx

npx \
  -p themer \
  -p @themerdev/colors-default \
  -p @themerdev/vim \
  -p @themerdev/wallpaper-block-wave \
  themer \
  -c @themerdev/colors-default \
  -t @themerdev/vim \
  -t @themerdev/wallpaper-block-wave \
  -o output

Themer color sets

Original color sets

Name Dark Preview Light Preview
@themerdev/colors-default @themerdev/colors-default dark preview @themerdev/colors-default light preview
@themerdev/colors-finger-paint @themerdev/colors-finger-paint dark preview @themerdev/colors-finger-paint light preview
@themerdev/colors-green-as-a-whistle @themerdev/colors-green-as-a-whistle dark preview @themerdev/colors-green-as-a-whistle light preview
@themerdev/colors-monkey @themerdev/colors-monkey dark preview @themerdev/colors-monkey light preview
@themerdev/colors-night-sky @themerdev/colors-night-sky dark preview (dark only)
@themerdev/colors-polar-ice @themerdev/colors-polar-ice dark preview @themerdev/colors-polar-ice light preview
@themerdev/colors-right-in-the-teals @themerdev/colors-right-in-the-teals dark preview @themerdev/colors-right-in-the-teals light preview

Ports from third-party themes

Name Dark Preview Light Preview
@themerdev/colors-dracula @themerdev/colors-dracula dark preview (dark only)
@themerdev/colors-github-universe !themer/colors-github-universe preview (dark only)
@themerdev/colors-lucid @themerdev/colors-lucid dark preview @themerdev/colors-lucid light preview
@themerdev/colors-mojave @themerdev/colors-mojave dark preview @themerdev/colors-mojave light preview
@themerdev/colors-nova @themerdev/colors-nova preview (dark only)
@themerdev/colors-one @themerdev/colors-one dark preview @themerdev/colors-one light preview
@themerdev/colors-rivet @themerdev/colors-rivet dark preview @themerdev/colors-rivet light preview
@themerdev/colors-seti @themerdev/colors-seti dark preview (dark only)
@themerdev/colors-solarized @themerdev/colors-solarized dark preview @themerdev/colors-solarized light preview

Create your own color set

To create your own color set, create a JavaScript file that exports a colors object, like so:

module.exports.colors = {

  // A color set can have both light and dark variants, but is only required
  // to have one.
  dark: {

    // Colors can be defined in any valid CSS format.

    // accent0-7 should be the main accent colors of your theme. See the table
    // in the "Color mappings" section for how the colors will be used in your
    // new themes.
    accent0: '#FF4050',
    accent1: '#F28144',
    accent2: '#FFD24A',
    accent3: '#A4CC35',
    accent4: '#26C99E',
    accent5: '#66BFFF',
    accent6: '#CC78FA',
    accent7: '#F553BF',

    // shade0-7 should be shades of the same hue, with shade0 being the
    // background and shade7 being the foreground. If you omit the
    // intermediate shades (1 through 6), they will be calculated automatically
    // for you.
    shade0: '#282629',
    shade1: '#474247',
    shade2: '#656066',
    shade3: '#847E85',
    shade4: '#A29DA3',
    shade5: '#C1BCC2',
    shade6: '#E0DCE0',
    shade7: '#FFFCFF'


  // Same as above, except that shade0 should be the lightest and shade7 should
  // be the darkest.
  light: { ... },


Pro Tip: you can use themer's Web UI to more easily select your colors, then click the "Download" button to generate a colors.js file.

Then pass the path to your JS file to the --colors argument of themer.

themer -c path/to/my/colors.js ...

Color mappings

To help you choose colors for your own color set, this is approximately how most themer templates will utilize your colors:

Color Key Typical Usage Conventional Color*
accent0 error, VCS deletion Red
accent1 syntax Orange
accent2 warning, VCS modification Yellow
accent3 success, VCS addition Green
accent4 syntax Cyan
accent5 syntax Blue
accent6 syntax, caret/cursor
accent7 syntax, special Magenta
shade0 background color
shade1 UI
shade2 UI, text selection
shade3 UI, code comments
shade4 UI
shade5 UI
shade6 foreground text
shade7 foreground text

*Conventional color is suggested for consistency with ANSI color names in terminal themes, but is not a hard requirement.

See themer's Web UI for a more visual representation of the color mappings.


  • If you omit shade1 through shade6, themer will interpolate them automatically for you, using color-steps.
  • themer supports any valid CSS color format; that means you can use chartreuse, rgb(127, 255, 0), rgb(50%, 100%, 0%), #7FFF00, hsl(90, 100%, 50%), etc.
  • I would recommend checking your color set into your dotfiles repo. Once you've fine-tuned it, you might consider publishing it to npm for others to use! (If you do, consider naming your package starting with themer-colors- so that others can easily find it.)

Using base16 schemes with Themer

In place of a themer color set file or npm package, you can also provide themer with any base16 scheme YAML file.

themer --colors path/to/base16-scheme.yml ...

Refer to the base16 repository for a list of base16 schemes.

Themer templates






Create your own template

To create your own template, create a JavaScript file that exports a render function, like so:

module.exports.render = function (colors, options) {

  colors is an object that will have one or both keys: 'light' and
  'dark', each being an object with keys 'accent0' through 'accent7'
  and 'shade0' through 'shade7'.

  options is an object representing the original command-line args
  passed to themer. This allows you to add special arguments that
  will apply only to your template. An example of this is allowing a
  themer user to specify custom resolutions for rendering a wallpaper.

  This function should return an array of Promises, each Promise
  resolving to an object of the following structure:
    name: '<the name of the file to be written>', // can include subdirectories, too
    contents: <a Buffer of the contents of the file to be written>,


Your JS file can then be passed to a --template argument of themer. That's it!

Here's an example template render function that generates a Slack sidebar theme from a themer color set.

Once you've developed your template, consider publishing it on npm so that others can use it!


themer is inspired by trevordmiller/nova and chriskempson/base16.

Conceptually, themer is very similar to base16, but:

  1. It is lighter, and simpler to use.
  2. It is more easily extensible with your own color sets and templates.
  3. It integrates better with your dotfiles, especially if you keep them under version control.


For instructions on how to contribute to themer, see CONTRIBUTING.md and themer's code of conduct.

Themer's Web UI

If you'd prefer to develop your themes visually, check out themer's Web UI, an offline-ready Progressive Web App.