Localize require

Created by: andreypopp

Make require inside scopedEval to resolve modules againt current module's filename. This way we can require functions from other modules.

Allows to do require(...) calls inside macro bodies:

macro sql {
  case { _ $expr:expr } => {
    var parser = require('sql-parser');
    return parser.parse(#{$expr}.token.value);
  } 
}

This is very useful when you want to embed some other language inside JS (via ES6 tagged template strings for example), see sweet-jsx or sweet-sql for example.