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[jest-expo] fix jest-preset mutating react-native preset #9051

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Dec 3, 2020
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3 changes: 2 additions & 1 deletion packages/jest-expo/jest-preset.js
Original file line number Diff line number Diff line change
@@ -1,8 +1,9 @@
'use strict';

const cloneDeep = require('lodash/cloneDeep');
const isEqual = require('lodash/isEqual');
// Derive the Expo Jest preset from the React Native one
const jestPreset = require('react-native/jest-preset');
const jestPreset = cloneDeep(require('react-native/jest-preset'));

// transform
if (!jestPreset.transform) {
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