Preprocess string in C/GLSL-preprocessor fashion
npm install prepr> Preprocess any string in C/GLSL-preprocessor fashion.

``js
import prepr from 'prepr';
prepr(
#define A 2;
#ifdef A
var a = A;
#endif
#if A > 40
//too far
#elif A < 1
//too close
#else
//about right
#endif
var b = myVar;
var c = myMacro('xyz');, {
myVar: 1,
myMacro: function (arg) { return arg; }
});
// ↓
var a = 2;
//about right
var b = 1;
var c = 'xyz';``
The primary purpose is to preprocess code for glsl-transpiler, so some C-preprocessor functionality is absent, but the project is welcome to forks and PRs.
* compile-js-like-c — another C preprocessor for js.