index.js
function (value, type) {
   if (!isValidType(type)) {
      throw Error('Invalid type supplied.');   
   }  
   if (!isOfType(value, type)) {
      argName = getNameForValue(value);
      typeName = getNameForType(type);
      throw Error('Expected ' + argName + ' to be an instance of ' + typeName + '.');
   }
}
function (value, type) {
   if (!isValidType(type)) {
      throw Error('Invalid type supplied.');   
   }  
   if (!isOfType(value, type)) {
      argName = getNameForValue(value);
      typeName = getNameForType(type);
      throw Error('Expected ' + argName + ' to be an instance of ' + typeName + '.');
   }
}
function ( value , type ) { if ( ! isValidType ( type ) ) { throw Error ( 'Invalid type supplied.' ) ; } if ( ! isOfType ( value , type ) ) { argName = getNameForValue ( value ) ; typeName = getNameForType ( type ) ; throw Error ( 'Expected ' + argName + ' to be an instance of ' + typeName + '.' ) ; } }
Asserts that the supplied value is of the supplied type.
@param {?} value
@param {type} types
Asserts that the supplied value is of the supplied type .