microsoft / microsoft/TypeScript

Support conditional compilation

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#449 98 comments 120 reactions 0 assignees View on GitHub

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Description

On codeplex this was a popular feature request:

https://typescript.codeplex.com/workitem/111
https://typescript.codeplex.com/workitem/1926

Personally I think preprocessor directives like #if, #elif, #else #endif with possibility to specify symbol to compiler would be very useful.
And a way to mark function (or ambient function declaration) as Conditional (something like [ConditionalAattribute](http://msdn.microsoft.com/en-us/library/system.diagnostics.conditionalattribute%28v=vs.110%29.aspx) in C#) would be great improvement too.
I have lot's of `console.log` like function calls that decrease performance of my application and ability to easily remove all calls to this function would be great.

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Review the two linked CodePlex feature requests and the discussion on this issue before defining the scope. Decide whether conditional compilation, compiler symbols, conditional functions, or all of them are required, then establish acceptance criteria for supported directives and removable calls.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
compilers
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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