Change the default behavior of "@import" to only import once.

[ljharb]

• Change the default behavior of "@import" to only import once.
• Add @import-multiple if for some insane reason you want multiple imports.
• Continue to support @import-once for backwards compatibility.
• Fixes Import Each Less File Only Once #212.

[lukeapage]

I think there is a spacing issue here

[lukeapage]

just the one minor issue, otherwise its +1 from me. Will pull if no-one else disagrees.

[dmcass]

Just thought I'd note here the one insane reason that I can think of for wanting to import the same file more than once (and why I'm glad you're keeping @import-multiple). I'm not sure if this can be addressed in a different way, but if anyone has suggestions I'd love to hear them. Imports can contain variable assignments, and if you want different variable values at different scopes, using an import to reevaluate the values for the current scope is actually quite helpful.

Quick example:
dynamic.less

@bar: @foo * 6px;

main.less

@foo: 2;
@import "dynamic";

.baz {
    width: @foo;      /* 12px */
}

@media only screen and (min-width: 600px) {
    @foo: 5;
    @import "dynamic";

    .baz {
        width: @foo;  /* 30px */
    }
}

Also, this is 👍 from me.

[ljharb]

@dmcass thanks for the explanation - personally I'd think that's way too much logic in CSS, and I'd rather have dynamic.less have @bar: 6px; and then in all the clients use @foo * @bar and then use @import-once. But to each their own, as long as there's a sane default.

[dmcass]

@ljharb totally agree for the example I gave, but that's much simpler than the actual case where I would use something like that, when multiple variables and mixins change values based on another one with much more complicated math.

[matthew-dean]

I see the theoretical case here, but to me, the complexity it adds just lends more weight to importing once, so that no one ever ever does this. ;-)

[Soviut]

I'd have to agree. Especially if an @import-multiple construct is created as a fallback.

[lukeapage]

pushed to 1.4.0