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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 2008 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 org.jspecify.nullness.Nullable;

/** All warnings should be reported as errors. */
public final class StrictWarningsGuard extends WarningsGuard {
  private static final long serialVersionUID = 1L;

  static final DiagnosticType UNRAISABLE_WARNING =
      DiagnosticType.warning("JSC_UNRAISABLE_WARNING", "{0}");

  @Override
  public @Nullable CheckLevel level(JSError error) {
    if (error.getType() == UNRAISABLE_WARNING) {
      return null;
    }
    return error.getDefaultLevel().isOn() ? CheckLevel.ERROR : null;
  }

  @Override
  protected int getPriority() {
    return WarningsGuard.Priority.STRICT.value; // applied last
  }
}