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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.

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/*
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 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0
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 * The Original Code is Rhino code, released
 * May 6, 1999.
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 * The Initial Developer of the Original Code is
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 * the Initial Developer. All Rights Reserved.
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 *   Google Inc.
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package com.google.javascript.rhino;

import org.jspecify.nullness.Nullable;

/**
 * The {@code StaticScope} interface must be implemented by any object that defines variables for
 * the purposes of static analysis. It is distinguished from the {@code Scriptable} class that Rhino
 * normally uses to represent a run-time scope.
 *
 */
public interface StaticScope {
  /**
   * Returns the root node associated with this scope. May be null.
   */
  Node getRootNode();

  /** Returns the scope enclosing this one or null if none. */
  StaticScope getParentScope();

  /**
   * Returns any defined slot within this scope for this name.  This call
   * continues searching through parent scopes if a slot with this name is not
   * found in the current scope.
   * @param name The name of the variable slot to look up.
   * @return The defined slot for the variable, or {@code null} if no
   *         definition exists.
   */
  StaticSlot getSlot(String name);

  /** Like {@code getSlot} but does not recurse into parent scopes. */
  StaticSlot getOwnSlot(String name);

  /**
   * Returns the topmost slot containing this name, or null if no slots do. May return true in cases
   * where {@link #getSlot} returns null, though. Do not rely on this method if you need an actual
   * slot.
   *
   * 

This method is intended for use while scopes are still being built, hence the name * 'eventual' declaration. Once scope building is complete, the scope returned from this method * must be equivalent to "getSlot(name).getScope()" or null */ default @Nullable StaticScope getTopmostScopeOfEventualDeclaration(String name) { StaticSlot slot = getOwnSlot(name); if (slot != null) { return slot.getScope(); } return getParentScope() != null ? getParentScope().getTopmostScopeOfEventualDeclaration(name) : null; } }





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