Function assertType

static/vuejs/vue.common.js:1393–1415

* Assert the type of a value

(value, type)

 * Assert the type of a value
 */
function assertType (value, type) {
  var valid;
  var expectedType = getType(type);
  if (expectedType === 'String') {
    valid = typeof value === (expectedType = 'string');
  } else if (expectedType === 'Number') {
    valid = typeof value === (expectedType = 'number');
  } else if (expectedType === 'Boolean') {
    valid = typeof value === (expectedType = 'boolean');
  } else if (expectedType === 'Function') {
    valid = typeof value === (expectedType = 'function');
  } else if (expectedType === 'Object') {
    valid = isPlainObject(value);
  } else if (expectedType === 'Array') {
    valid = Array.isArray(value);
  } else {
    valid = value instanceof type;
  }
  return {
    valid: valid,
    expectedType: expectedType
  }
}

/**
 * Use function string name to check built-in types,