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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 2011 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 static com.google.common.base.Preconditions.checkState;

import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.errorprone.annotations.Immutable;
import java.io.Serializable;
import java.util.List;
import org.jspecify.nullness.Nullable;

/**
 * Options for how to manage dependencies between input files.
 *
 * 

Dependency information is pulled out from the JS code by looking for import and export * primitives (like ES import and export statements, Closure Library's goog.module, goog.provide and * goog.require calls, or CommonJS require calls). The compiler can optionally use this information * to sort input files in dependency order and/or prune unnecessary input files. * *

Also see {@link CodingConvention#extractClassNameIfProvide(Node, Node)} and {@link * CodingConvention#extractClassNameIfRequire(Node, Node)}, which affect what the compiler considers * to be goog.provide and goog.require statements. */ @AutoValue @Immutable public abstract class DependencyOptions implements Serializable { /** Describes how the compiler should manage dependencies. */ public enum DependencyMode { /** All input files will be included in the compilation in the order they were specified in. */ NONE, /** All input files will be included in the compilation in dependency order. */ SORT_ONLY, /** * Input files that are transitive dependencies of the entry points will be included in the * compilation in dependency order. All other input files will be dropped. * *

In addition to the explicitly defined entry points, moochers (see below) are implicit * entry points. */ PRUNE_LEGACY, /** * Input files that are transitive dependencies of the entry points will be included in the * compilation in dependency order. All other input files will be dropped. * *

All entry points must be explicitly defined. */ PRUNE; } /** Returns the dependency management mode. */ public abstract DependencyMode getMode(); /** Returns the list of explicit entry points. */ public abstract ImmutableList getEntryPoints(); /** Returns whether dependency management is enabled. */ public boolean needsManagement() { return getMode() != DependencyMode.NONE; } /** * Returns whether files should be sorted. * *

If true, the input files should be sorted in dependency order. Otherwise, input files should * not be reordered. */ public boolean shouldSort() { return getMode() != DependencyMode.NONE; } /** * Returns whether files should be pruned. * *

If true, an input file should be excluded from the compilation if it is not a transitive * dependency of an entry point. Otherwise, all input files should be included. */ public boolean shouldPrune() { return getMode() == DependencyMode.PRUNE_LEGACY || getMode() == DependencyMode.PRUNE; } /** * Returns whether moochers should be dropped. * *

A moocher is a strong file that does not goog.provide a namespace and is not a goog.module, * ES module or CommonJS module. Weak files are never considered moochers. * *

If true, moochers should not be considered implicit entry points. */ public boolean shouldDropMoochers() { return getMode() == DependencyMode.PRUNE; } /** Returns a {@link DependencyOptions} using the {@link DependencyMode#NONE} mode. */ public static DependencyOptions none() { return new AutoValue_DependencyOptions(DependencyMode.NONE, ImmutableList.of()); } /** Returns a {@link DependencyOptions} using the {@link DependencyMode#SORT_ONLY} mode. */ public static DependencyOptions sortOnly() { return new AutoValue_DependencyOptions(DependencyMode.SORT_ONLY, ImmutableList.of()); } /** * Returns a {@link DependencyOptions} using the {@link DependencyMode#PRUNE_LEGACY} mode with the * given entry points. * * @deprecated Prefer {@link #pruneForEntryPoints(Iterable)} with a complete list of entry points. */ @Deprecated public static DependencyOptions pruneLegacyForEntryPoints( Iterable entryPoints) { return new AutoValue_DependencyOptions( DependencyMode.PRUNE_LEGACY, ImmutableList.copyOf(entryPoints)); } /** * Returns a {@link DependencyOptions} using the {@link DependencyMode#PRUNE} mode with the given * entry points. */ public static DependencyOptions pruneForEntryPoints(Iterable entryPoints) { checkState( !Iterables.isEmpty(entryPoints), "DependencyMode.PRUNE requires at least one entry point"); return new AutoValue_DependencyOptions(DependencyMode.PRUNE, ImmutableList.copyOf(entryPoints)); } /** * A helper function for validating dependency management flags and converting them into a {@link * DependencyOptions} object. * *

Returns null when no dependency management flags have been specified. * *

TODO(tjgq): Simplify this once we deprecate and remove all legacy flags and standardize on * --dependency_mode and --entry_point. */ public static @Nullable DependencyOptions fromFlags( @Nullable DependencyMode dependencyModeFlag, List entryPointFlag, List closureEntryPointFlag, String commonJsEntryModuleFlag, boolean manageClosureDependenciesFlag, boolean onlyClosureDependenciesFlag) { boolean hasEntryPoint = commonJsEntryModuleFlag != null || !entryPointFlag.isEmpty() || !closureEntryPointFlag.isEmpty(); if (!hasEntryPoint && onlyClosureDependenciesFlag) { throw new FlagUsageException("--only_closure_dependencies requires --entry_point."); } if (!hasEntryPoint && dependencyModeFlag == DependencyMode.PRUNE) { throw new FlagUsageException("--dependency_mode=PRUNE requires --entry_point."); } if (hasEntryPoint && (dependencyModeFlag == DependencyMode.NONE || dependencyModeFlag == DependencyMode.SORT_ONLY)) { throw new FlagUsageException( "--dependency_mode=" + dependencyModeFlag + " cannot be used with --entry_point, --closure_entry_point or " + "--common_js_entry_module."); } if (!entryPointFlag.isEmpty() && !closureEntryPointFlag.isEmpty()) { throw new FlagUsageException("--closure_entry_point cannot be used with --entry_point."); } if (commonJsEntryModuleFlag != null && (!entryPointFlag.isEmpty() || !closureEntryPointFlag.isEmpty())) { throw new FlagUsageException( "--common_js_entry_module cannot be used with either --entry_point or " + "--closure_entry_point."); } if (manageClosureDependenciesFlag && onlyClosureDependenciesFlag) { throw new FlagUsageException( "--only_closure_dependencies cannot be used with --manage_closure_dependencies."); } if (manageClosureDependenciesFlag && dependencyModeFlag != null) { throw new FlagUsageException( "--manage_closure_dependencies cannot be used with --dependency_mode."); } if (onlyClosureDependenciesFlag && dependencyModeFlag != null) { throw new FlagUsageException( "--only_closure_dependencies cannot be used with --dependency_mode."); } DependencyMode dependencyMode; if (dependencyModeFlag == DependencyMode.PRUNE || onlyClosureDependenciesFlag) { dependencyMode = DependencyMode.PRUNE; } else if (dependencyModeFlag == DependencyMode.PRUNE_LEGACY || manageClosureDependenciesFlag || hasEntryPoint) { dependencyMode = DependencyMode.PRUNE_LEGACY; } else if (dependencyModeFlag != null) { dependencyMode = dependencyModeFlag; } else { return null; } ImmutableList.Builder entryPointsBuilder = ImmutableList.builder(); if (commonJsEntryModuleFlag != null) { entryPointsBuilder.add(ModuleIdentifier.forFile(commonJsEntryModuleFlag)); } for (String entryPoint : entryPointFlag) { entryPointsBuilder.add(ModuleIdentifier.forFlagValue(entryPoint)); } for (String closureEntryPoint : closureEntryPointFlag) { entryPointsBuilder.add(ModuleIdentifier.forClosure(closureEntryPoint)); } switch (dependencyMode) { case NONE: return DependencyOptions.none(); case SORT_ONLY: return DependencyOptions.sortOnly(); case PRUNE_LEGACY: return DependencyOptions.pruneLegacyForEntryPoints(entryPointsBuilder.build()); case PRUNE: return DependencyOptions.pruneForEntryPoints(entryPointsBuilder.build()); } throw new AssertionError("Invalid DependencyMode"); } }





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