code: function evalModule( source, context ) {
  
      const argumentKeys = Object.keys( context );
      const argumentValues = argumentKeys.map( argument => context[ argument ] );
  
      const sandbox = { exports: {} };
      argumentKeys.push( "module", "exports", source );
      argumentValues.push( sandbox, sandbox.exports );
  
      Function( ...argumentKeys )( ...argumentValues );
  
      return sandbox.exports;
  
  }
docs: `eval` the given source as a CommonJS module, using properties found in `context` as top-level variables.
  
  Based on `vm.runInContext` found in Node.js, this is a cross-env solution.