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Mint 0.8.0 Friday, March 13th, 2020

Mint 0.8.0 has been released!

This release comes with new language features, bug fixes and additions to the standard library.

There are 122 commits since 0.7.1 by 6 contributors.

Let’s review some highlights in this release. But don’t miss out on the rest of the release changelog which has a lot of valuable information.


In this release React has been replaced with Preact as the underlying runtime. This means that the size of the generated JavaScript is a lot smaller!

These are the results for the Mint implementation of RealWorld (GZipped version is 65% smaller):

To see a more real world use here are the results for the frontend of Base API (GZipped version is 30% smaller):


This release introduces tuples, datastructures which contains a fixed set values, where each value can have a different type.

try {
  {first, second, third} =
    {"First Value", 10, true}


Check out its documentation here , and the corresponding issue here .


It is now possible to declare constants in stores , modules and components.

module Math {
  const PI = 3.141592653589793

Constants can be accessed like variables inside the scope of the entity which defined them and from outside they can be accessed with the following syntax:


Array pattern matching

It is now possible to pattern match array in case expressions.

case (["A", "B", "C"]) {
  [] => ""                /* Empty array  */
  ["a"] => ""             /* Array with only one specific element */
  [a] => ""               /* Array with only one element */
  [a, b] => ""            /* Array with only two elements  */
  [a, ...middle, b] => "" /* Array at least with three elements */
  [...head, tail] => ""   /* Array at least two elements */
  [head, ...tail] => ""   /* Array at least two elements */
  [...items] => ""        /* Items would be the array */
  => ""                   /* Fallback as usual */

Additions to the Standard Library

The following functions has been added to the standard library which ships with Mint:

  • Clipboard.set
  • FileSize.format
  • Provider.MediaQuery
  • Provider.Resize
  • Provider.Shortcuts
  • Dom.containedInSelector
  • Dom.getAttribute
  • Dom.setStyle
  • Dom.focus
  • Dom.getElementFromPoint
  • String.trim
  • String.withDefault
  • Window.prompt
  • Window.getScrollbarWidth
  • Maybe.andThen
  • Math.random

External Assets

It is now possible to add external stylesheets (CSS) alongside with external javascripts , each is compiled into a single file (one for stylesheets one for JavaSctipts).

More information in issues and PRs #151 #155 #183


CSS rules with multiple selectors are now compiled separately into their own rules:

p {
  color: red;

now compiles as:

div {
  color: red;

p {
  color: red;

This is needed because most browsers will skip rules containing invalid selectors like this one:

&::-ms-thumb {
  background-color: red;
  cursor: pointer;
  height: 20px;
  width: 20px;
  border: 0;

Next steps

Please update your Mint and report any issues. We will keep moving forward and start the development focusing on 0.9.0.