sketch of executable function context method ~ populates context props as vars into new scope ~ follows commonjs mod exports falafel

function-exec.js

// context, scopeName, scopeFunction
// context, 'exports', fn
function exec(context, fn) {
  
  var code = '"use strict";\n'; // need paranoid sandbox for non-strict runtimes

  for (var k in context) {
    if (context.hasOwnProperty(k)) {
      code = code + 'var ' + k + ' = context[\'' + k + '\'];\n';
    }
  }

  code = code + 'var exports = module.exports;\n';

  // prevent context leakage
  'context' in context || (code = code + 'var context = undefined;\n');
  'exec' in context || (code = code + 'var exec = undefined;\n');  
  code = code + '(' + fn.toString() + ').call(exports)' + ';\n';
  
  (Function('context', code))(context);
  
  return context;
};

// Content Security Policy w/o "script-src 'self' 'unsafe-eval';"

function execWith(context, fn) {
// thnk that this has to be built specifically from command line
}

// module api - strings to protect from aggressive minifiers
//var deps = { 'module': { 'exports': { 'property': 'property value' } } };
//deps['exports'] = deps['module']['exports'];
//deps['famousFace'] = { id: 'famousFace' };

var deps = (function() {

  var o = {
    // own
    'property': 'property value' 
  };
  
  var s = { 
    'module': { 'exports': o }
  };

  // static
  s['famousFace'] = { id: 'famousFace' };
  
  return s;
}());

function M() {

  // undecl = true; // use strict: ReferenceError: assignment to undeclared variable undecl

  console.log(M); // this function

  console.log('context: ' + context) // should be undefined
  console.log('exec: ' + exec) // should be undefined  
  console.log('fn: ' + typeof fn) // should be undefined
  console.log('code: ' + typeof code) // should be undefined
  console.log('k: ' + typeof k) // should be undefined

  // and finally the pay off
  console.log(famousFace) // should be { id: 'famousFace' }

  // commonjs api
  console.log('module.exports...');
  console.log(module.exports)
  console.log('exports...');
  console.log(exports);
  console.log('this...');
  console.log(this);
  console.log('exports is this? ' + (exports === this)); // should be true
}

//console.log(exec.toString())

exec.call(deps['exports'], deps, M);

var errorTest = {
    'module' : { 'exports' : {} },
    'exec': 'test', 'context': 'test'
};

exec.call({}, errorTest, function () {
  console.log('famousFace...');
  console.log(exports);
  console.log(typeof exec); // string
  console.log(typeof context); // string
  console.log(typeof famousFace); // undefined
  //console.log(famousFace); // should throw, "ReferenceError: famousFace is not defined"
});