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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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/*
 * 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;

import com.google.common.collect.ImmutableSet;
import com.google.javascript.rhino.Node;

/**
 * Adds runtime libraries to the beginning of the AST. Any libraries explicitly requested via the
 * {@link CompilerOptions#forceLibraryInjection} field.
 *
 * TODO(b/120486392): merge this pass with {@link InjectTranspilationRuntimeLibraries}.
 */
final class InjectRuntimeLibraries implements CompilerPass {
  private final AbstractCompiler compiler;
  private final ImmutableSet forceInjectedLibraries;

  InjectRuntimeLibraries(AbstractCompiler compiler, ImmutableSet forceInjectedLibraries) {
    this.compiler = compiler;
    this.forceInjectedLibraries = forceInjectedLibraries;
  }

  @Override
  public void process(Node externs, Node root) {
    injectLibraries();
  }

  private void injectLibraries() {
    for (String forced : this.forceInjectedLibraries) {
      compiler.ensureLibraryInjected(forced, true);
    }
  }
}