Conditional compilation

[dead-claudia]

Conditional compilation would be fantastic, in my opinion, for things like imports. I would really appreciate something like this:

@if DEBUG
@define HAS_ASSERT
import assert from "assert";
@elif RELEASE
import aRandomModule from "my-cool-module";
@else
@undef FOO
@endif

Not asking for macros (there's not nearly as much of a use case in TypeScript as in e.g. C/C++), but merely having an if-else/define/undef preprocessor would be incredibly helpful.

[weswigham]

Dupe of #449 ?

[jesseschalken]

Just import all the things you could need and decide what to use at runtime.

At best all you'd be saving with condition compilation is the overhead of an import.

[dead-claudia]

Size is a reason to prefer conditional importing and compilation,
particularly in the case of the browser.

On Sun, Sep 6, 2015, 09:58 Jesse Schalken notifications@github.com wrote:

Just import all the things you could need and decide what to use at
runtime.

At best all you'd be saving with condition compilation is the overhead of
an import.

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#4671 (comment)
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[yortus]

I made a proposal with a working implementation in #4691