There are times when you may want to simply call a perform, but you do not need anything output (including storing a worth for later use). In that scenario, you merely have to return Bogus from the operate.
inside the imported file, imports as regular, but when the CSS is created, "reference" selectors (and also any media queries containing only reference selectors) aren't output. reference styles will not likely demonstrate up within your generated CSS unless the reference models are applied as mixins or extended.
The "father or mother selectors" operator has a range of uses. Essentially any time you may need the selectors of your nested rules for being merged in other means compared to the default. By way of example A different usual use of your & is to produce repetitive class names:
Lengthen can be put into a ruleset's body applying &:prolong(selector) syntax. Putting increase right into a physique is a shortcut for putting it into every single selector of that ruleset.
Mixins are a little bit more functional as maps as a result of namespacing and the ability to overload mixins.
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The default conduct of @import statements. This means the file is imported only once and subsequent import statements for that file will probably be disregarded.
Mixins duplicate each of the Houses right into a selector, which can cause unnecessary duplication. Thus you can use extends in place of mixins to move the selector up to the Homes you would like to utilize, which leads to less CSS getting produced.
Observe that prior to v2.0.0, only variables that have been declared in the root or present scope have been regarded as Which only The existing file and calling documents were viewed as when seeking a variable.
Get of pseudo-lessons does matter. Selectors backlink:hover:frequented and hyperlink:visited:hover match a similar set of things, but prolong treats them as different:
Occasionally, you may want to change the actions of a mixin, dependant on the parameters you go to it. Let's begin with anything fundamental:
Notice: unlocking variables into scope by means of a identified as mixin is deprecated. Use home / variable accessors.
This means, this would toss an error in 2.x, as functions had to be part of the worth of the house or variable assignment:
Namespacing your mixins like this cuts down conflicts with other library mixins or user mixins, but can also be a method to "Arrange" teams of mixins.