51 lines
1.7 KiB
JavaScript
51 lines
1.7 KiB
JavaScript
/* Copyright 2017 Mozilla Foundation
|
|
*
|
|
* 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.
|
|
*/
|
|
/* eslint-env node */
|
|
|
|
'use strict';
|
|
|
|
function isPDFJSDevCheck(test) {
|
|
// Is it something like `typeof __pdfjsdev_webpack__ === 'undefined'`?
|
|
return test.type === 'BinaryExpression' &&
|
|
(test.operator === '===' || test.operator === '!==' ||
|
|
test.operator === '==' || test.operator === '!=') &&
|
|
test.left.type === 'UnaryExpression' &&
|
|
test.left.operator === 'typeof' &&
|
|
test.left.argument.type === 'Identifier' &&
|
|
test.left.argument.name === '__pdfjsdev_webpack__' &&
|
|
test.right.type === 'Literal' && test.right.value === 'undefined';
|
|
}
|
|
|
|
function isPDFJSDevEnabled(test) {
|
|
return test.operator[0] === '!';
|
|
}
|
|
|
|
function BlockRequirePlugin() {}
|
|
|
|
BlockRequirePlugin.prototype.apply = function(compiler) {
|
|
compiler.plugin('compilation', function(compilation, data) {
|
|
data.normalModuleFactory.plugin('parser', function (parser, options) {
|
|
parser.plugin('statement if', function (ifNode) {
|
|
if (isPDFJSDevCheck(ifNode.test)) {
|
|
return isPDFJSDevEnabled(ifNode.test);
|
|
}
|
|
return undefined;
|
|
});
|
|
});
|
|
});
|
|
};
|
|
|
|
module.exports = BlockRequirePlugin;
|