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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs. This binary checks for style issues such as incorrect or missing JSDoc usage, and missing goog.require() statements. It does not do more advanced checks such as typechecking.

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/*
 * Copyright 2014 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.javascript.jscomp.newtypes;

import java.util.Collection;

/**
 * A type that can contain properties,
 * such as an ObjectType, NominalType, or a Namespace.
 */
interface TypeWithProperties {
  /** Get the inferred type of the given property */
  JSType getProp(QualifiedName qname);

  /** Get the declared type of the given property */
  JSType getDeclaredProp(QualifiedName qname);

  /** Return whether this type contains any form of property */
  boolean mayHaveProp(QualifiedName qname);

  /** Return whether this type contains a required property */
  boolean hasProp(QualifiedName qname);

  /** Return whether this type contains a constant property */
  boolean hasConstantProp(QualifiedName qname);

  /**
   * Return all topmost subtypes of this type that have the given property.
   * If the type itself has the property then only this type is included in the result.
   */
  Collection getSubtypesWithProperty(QualifiedName qname);
}