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chore: add babel plugin to make sure Jest is unaffected by fake Promi…
…se implementations (#7225)
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/** | ||
* Copyright (c) 2014-present, Facebook, Inc. All rights reserved. | ||
* | ||
* This source code is licensed under the MIT license found in the | ||
* LICENSE file in the root directory of this source tree. | ||
*/ | ||
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'use strict'; | ||
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// This plugin exists to make sure that we use a `Promise` that has not been messed with by user code. | ||
// Might consider extending this to other globals as well in the future | ||
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module.exports = ({template}) => { | ||
const promiseDeclaration = template(` | ||
var Promise = global[Symbol.for('jest-native-promise')] || global.Promise; | ||
`); | ||
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return { | ||
name: 'jest-native-promise', | ||
visitor: { | ||
ReferencedIdentifier(path, state) { | ||
if (path.node.name === 'Promise' && !state.injectedPromise) { | ||
state.injectedPromise = true; | ||
path | ||
.findParent(p => p.isProgram()) | ||
.unshiftContainer('body', promiseDeclaration()); | ||
} | ||
}, | ||
}, | ||
}; | ||
}; |
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