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    1.4.0 • Public • Published

    JigSass Tools typography

    NPM version Build Status Dependency Status

    A REM-based typographic system with support for responsive vertical rhythms, named-sizes and flexible modular scales.
    Inspired by accoutrement-scale


    Using npm:

    npm i -S jigsass-tools-typography


    @import 'path/to/jigsass-tools-typography/scss/index';

    jigsass-tools-typography is based on a typographic system that sets the font-size of the html element to a fourth of the desired line-height, which will then serve as the base-unit for establishing and maintaining a vertical rhythm. It then sets the font-size of the body element to the base font size, and its line-height to 4rem.

    By default, the base font size is set at 16px, while the vertical rhythm is at 6px, giving us a default line-height 1.5 times the default font-size (24px).

    All sizes can be defined on a per-breakpoint level. jigsass-tools-typography depends on jigsass-tools-mq to manage media-queries and breakpoints definitions.

    A good place to start at, is by defining these two sizes and other the other jigsass-tools-typography configuration variables so that they match your project's settings and design:

    // Default output unit, where applicable 
    $jigsass-defaule-unit: rem;
    // Should a pixel fallback be included for rem values 
    $jigsass-rem-px-fallback: false;
    // User-defined ratios for building modular scales. 
    // Extends the default map 
    $jigsass-ratios: (
      some-ratio: 1.273;
    $jigsass-default-ratio: major-second;
    // Extends the default map of named-sizes. 
    $jigsass-sizes: (
      // ** Override defaults ** //
      // Will be set as the font-size of the `html` element
      // and used as the basic unit of vertical rhythm.
      rhythm-unit: (
        default: 6px,   // In `default` breakpoint.
        medium: 7px     // In `medium` breakpoint.
      // Will be used to set the `font-size` of the `body` element.
      body: (
        default: 16px,  // In `default` breakpoint.
        medium: 18px,   // In `medium`breakpoint.
      // The minimum amount of pixels above and below text lines
      min-line-padding: (default: 2px), 
      // ** Named sizes ** //
      headline: (
       default: body 3 golden,  // format: base (named-size or number) [exponent [ratio]]

    The sizes are then easily available, converted into the unit of your choice:

    @include jigsass-set-baseline;
    .headline {
      @include jigsass-font-size(headline, $bps: all, $unit: rem);
      padding-right: jigsass-get-size(rhythm-unit, $unit: rem);

    In depth documentation of jigsass-tools-typography features can be found in the sassdoc directory, or online at


    Documentation of JigSass Tools typography's Sass features is generated by SassDoc.

    Run gulp serve:sassdoc to fire up a live server serving the documentation.

    To generate documentation from annotation in the source code, run gulp sass:doc.

    To disable the generation of sass documentation, create an empty noSassDoc file at the root jigsass-tools-typography directory.


    It is a best practice for JigSass modules to not automatically generate css on @import, but rather have to user explicitly enable the generation of specific styles from the module.

    Contributions in the form of pull-requests, issues, bug reports, etc. are welcome. Please feel free to fork, hack or modify JigSass Tools typography in any way you see fit.

    Writing documentation

    Good documentation is crucial for scalability and maintainability. When writing your module, please do make sure that both its Sass functionality (functions, mixins, variables and placeholder selectors), as well as the CSS it generates (selectors, concepts, usage exmples, etc.) are well documented.

    As mentioned above, the Sass is documented using SassDoc (Documention).

    Running tests

    gulp lint will, well, lint the contents scss files in the scss directory.

    gulp test with run module's test using Mocha and Sassaby.

    gulp tdd will watch both the Sass files and the test specs for changes, and will run tests automatically upon them.

    Writing tests

    JigSass Tools typography tests are written using Sassaby and Mocha. Spec files are located in the test directory.

    Mocha allows us to place a call to before() in the root of any test file and it will be run once, before all the other tests in every test_*.js file. We can also require() files and assign them to the global object to make them available to all test_*.js files.

    jigsass-tools-typography uses a file called helper.js can be used to set up mocha globals requires and before().

    In addition to Sassaby's testing functions, jigsass-tools-typography makes a few Sass functions available to the test suite, for use inside Sassaby tests:

    jig-var-equals($value, $var) -> {boolean}
    Check if a variable equals a value.
    $value {*}: A value to compare the value of $var to.
    $var {*}: The variable to test
    jig-var-type-is($type, $var) -> {boolean}
    Check if a variable is of a certain type.
    $type {string}: A type to compare with the type of $var.
    $var {*}: The variable to test
    jig-map-key-equals($value, $map, $keys...) -> {boolean}
    Check if a map's key is assigned a cerain value.
    $value {*}: A value to compare the value of a key in $map with.
    $map {map}: The map to test.
    $keys... {arglist}: A recursive chain of keys.
    jig-map-key-type-is($type, $map, keys...) -> {boolean}
    Check if a map's key is of a certain type
    $type {string}: A type to compare with the type of $var.
    $map {map}: The map to test.
    $keys... {arglist}: A recursive chain of keys.

    File structure

    ┬ ./
    ├─┬ scss/ 
    │ └─ index.scss # The module's importable file. 
    ├── sassdoc/    # Generated documentation  
    │               # of the module's sass features 
    └─┬─ test/
      ├─┬ helpers/
      │ │
      │ ├── importer.scss       # Used for easilty importing tested scss files 
      │ │
      │ └── _test_helpers.scss  # JigSass's assertion helpers, 
      │                         # for use inside Sassaby tests. 
      ├── helper.js              # Used for defining global `before()` 
      │                          # functions and requiring modules. 
      └── test_jigsass-tools-typography # Specs. Mocha will automatically  
                                        # run all javascript files located 
                                        # in the `test` directory. 

    License: MIT


    npm i jigsass-tools-typography

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