@ampproject/rollup-plugin-closure-compiler
Version:
Rollup + Google Closure Compiler
28 lines (27 loc) • 1.24 kB
TypeScript
/**
* Copyright 2018 The AMP HTML Authors. All Rights Reserved.
*
* 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.
*/
import { ChunkTransform } from '../../transform';
import MagicString from 'magic-string';
export default class ConstTransform extends ChunkTransform {
name: string;
/**
* When outputting ES2017+ code there is neglagible differences between `const` and `let` for runtime performance.
* So, we replace all usages of `const` with `let` to enable more variable folding.
* @param code source following closure compiler minification
* @return code after removing the strict mode declaration (when safe to do so)
*/
pre(fileName: string, source: MagicString): Promise<MagicString>;
}