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type of given value and throw if does not pass\nfunction type(actual, T) {\n  var errors = [];\n  // currentStack = [];\n\n  if (!isType(actual, T, errors)) {\n    // console.log(JSON.stringify(errors, null, '  '));\n    // TODO(vojta): print \"an instance of\" only if T starts with uppercase.\n    var msg = 'Expected an instance of ' + prettyPrint(T) + ', got ' + prettyPrint(actual) + '!';\n    if (errors.length) {\n      msg += '\\n' + formatErrors(errors);\n    }\n\n    throw new Error(msg);\n  }\n  return actual;\n}\n\nfunction returnType(actual, T) {\n  var errors = [];\n  // currentStack = [];\n\n  if (!isType(actual, T, errors)) {\n    // console.log(JSON.stringify(errors, null, '  '));\n    // TODO(vojta): print \"an instance of\" only if T starts with uppercase.\n    var msg = 'Expected to return an instance of ' + prettyPrint(T) + ', got ' + prettyPrint(actual) + '!';\n    if (errors.length) {\n      msg += '\\n' + formatErrors(errors);\n    }\n\n    throw new Error(msg);\n  }\n\n  return actual;\n}\n\n\n// TODO(vojta): define these with DSL?\nvar string = define('string', function(value) {\n  return typeof value === 'string';\n});\n\n// function string() {}\n// string.assert = function(value) {\n//   return typeof value === 'string';\n// };\n\nvar boolean = define('boolean', function(value) {\n  return typeof value === 'boolean';\n});\n// function boolean() {}\n// boolean.assert = function(value) {\n//   return typeof value === 'boolean';\n// };\n\nvar number = define('number', function(value) {\n  return typeof value === 'number';\n});\n// function number() {}\n// number.assert = function(value) {\n//   return typeof value === 'number';\n// };\n\n\nfunction arrayOf(...types) {\n  return assert.define('array of ' + types.map(prettyPrint).join('/'), function(value) {\n    if (assert(value).is(Array)) {\n      for (var item of value) {\n        assert(item).is(...types);\n      }\n    }\n  });\n}\n\nfunction structure(definition) {\n  var properties = Object.keys(definition);\n  return assert.define('object with properties ' + properties.join(', '), function(value) {\n    if (assert(value).is(Object)) {\n      for (var property of properties) {\n        assert(value[property]).is(definition[property]);\n      }\n    }\n  })\n}\n\n\n\n// I'm sorry, bad global state... to make the API nice ;-)\nvar currentStack = [];\n\nfunction fail(message) {\n  currentStack.push(message);\n}\n\nfunction define(classOrName, check) {\n  var cls = classOrName;\n\n  if (typeof classOrName === 'string') {\n    cls = function() {};\n    cls.__assertName = classOrName;\n  }\n\n  cls.assert = function(value) {\n    // var parentStack = currentStack;\n\n    // currentStack = [];\n\n    return check(value);\n\n    // if (currentStack.length) {\n    //   parentStack.push(currentStack)\n    // }\n    // currentStack = parentStack;\n  };\n\n  return cls;\n}\n\n\n\nfunction assert(value) {\n  return {\n    is: function is(...types) {\n      // var errors = []\n      var allErrors = [];\n      var errors;\n\n      for (var type of types) {\n        errors = [];\n\n        if (isType(value, type, errors)) {\n          return true;\n        }\n\n        // if no errors, merge multiple \"is not instance of \" into x/y/z ?\n        allErrors.push(prettyPrint(value) + ' is not instance of ' + prettyPrint(type))\n        if (errors.length) {\n          allErrors.push(errors);\n        }\n      }\n\n      // if (types.length > 1) {\n      //   currentStack.push(['has to be ' + types.map(prettyPrint).join(' or '), ...allErrors]);\n      // } else {\n        currentStack.push(...allErrors);\n      // }\n      return false;\n    }\n  };\n}\n\n\n// PUBLIC API\n\n// asserting API\n\n// throw if no type provided\nassert.type = type;\n\n// throw if odd number of args\nassert.argumentTypes = assertArgumentTypes;\nassert.returnType = returnType;\n\n\n// define AP;\nassert.define = define;\nassert.fail = fail;\n\n// primitive value type;\nassert.string = string;\nassert.number = number;\nassert.boolean = boolean;\n\n// custom types\nassert.arrayOf = arrayOf;\nassert.structure = structure;\n\n\nexport {assert}\n","\n            for (var $__placeholder__0 = [], $__placeholder__1 = 0;\n                 $__placeholder__2 < arguments.length; $__placeholder__3++)\n              $__placeholder__4[$__placeholder__5] = arguments[$__placeholder__6];","\n        for (var $__placeholder__0 =\n                 $__placeholder__1[\n                     $traceurRuntime.toProperty(Symbol.iterator)](),\n                 $__placeholder__2;\n             !($__placeholder__3 = $__placeholder__4.next()).done; ) {\n          $__placeholder__5;\n          $__placeholder__6;\n        }","void 0","$traceurRuntime.spread($__placeholder__0)","\n        $__export($__placeholder__0, $__placeholder__1)\n      ","return {\n      setters: $__placeholder__0,\n      execute: $__placeholder__1\n    }","$__export($__placeholder__0, $__placeholder__1);"]}