50 lines
1.7 KiB
50 lines
1.7 KiB
/* Copyright 2017 Mozilla Foundation |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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/* eslint-env node */ |
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'use strict'; |
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function isPDFJSDevCheck(test) { |
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// Is it something like `typeof __pdfjsdev_webpack__ === 'undefined'`? |
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return test.type === 'BinaryExpression' && |
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(test.operator === '===' || test.operator === '!==' || |
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test.operator === '==' || test.operator === '!=') && |
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test.left.type === 'UnaryExpression' && |
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test.left.operator === 'typeof' && |
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test.left.argument.type === 'Identifier' && |
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test.left.argument.name === '__pdfjsdev_webpack__' && |
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test.right.type === 'Literal' && test.right.value === 'undefined'; |
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} |
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function isPDFJSDevEnabled(test) { |
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return test.operator[0] === '!'; |
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} |
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function BlockRequirePlugin() {} |
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BlockRequirePlugin.prototype.apply = function(compiler) { |
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compiler.plugin('compilation', function(compilation, data) { |
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data.normalModuleFactory.plugin('parser', function (parser, options) { |
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parser.plugin('statement if', function (ifNode) { |
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if (isPDFJSDevCheck(ifNode.test)) { |
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return isPDFJSDevEnabled(ifNode.test); |
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} |
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return undefined; |
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}); |
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}); |
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}); |
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}; |
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module.exports = BlockRequirePlugin;
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