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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 2017 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.
 */

'require base';


/**
 * Whether to assume ES5 is available.  This enables removing several
 * internal polyfills, which must otherwise be detected at runtime.
 * @define {boolean}
 */
$jscomp.ASSUME_ES5 = false;

/**
 * Whether to skip the conformance check and simply use the polyfill always.
 * @define {boolean}
 */
$jscomp.ASSUME_NO_NATIVE_MAP = false;

/**
 * Whether to skip the conformance check and simply use the polyfill always.
 * @define {boolean}
 */
$jscomp.ASSUME_NO_NATIVE_SET = false;

/**
 * Whether to provide an incorrect but tiny Math.fround polyfill that just
 * returns the number given.  This is usually okay to do, particularly if
 * `Math.fround` is only used to allow the JavaScript engine to use faster
 * 32-bit float operations, but could cause problems if program logic is
 * dependent on floats being truncated consistently.
 * @define {boolean}
 */
$jscomp.SIMPLE_FROUND_POLYFILL = false;

/**
 * Whether to isolate all injected polyfills from global state. This is not
 * on by default, as it bloats code size, but is useful when code needs to
 * operate on untrusted third_party sites. It relies on a compiler pass to
 * rewrite potential polyfill accesses.
 * @define {boolean}
 */
$jscomp.ISOLATE_POLYFILLS = false;

/**
 * Should we unconditionally override a native Promise implementation with our
 * own?
 * @define {boolean}
 */
$jscomp.FORCE_POLYFILL_PROMISE = false;

/**
 * Override the native Promise implementation if unhandledrejection event is not
 * supported.
 * @define {boolean}
 */
$jscomp.FORCE_POLYFILL_PROMISE_WHEN_NO_UNHANDLED_REJECTION = false;

/**
 * Whether to instrument async/await and monkey-patch language built-ins to
 * propagate AsyncContext.
 * @define {boolean}
 */
$jscomp.INSTRUMENT_ASYNC_CONTEXT = true;