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Fix Node.js 4 support with Proxy #5489

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Feb 7, 2018
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Fix Node.js 4 support with Proxy #5489

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4 changes: 4 additions & 0 deletions packages/jest-util/src/create_process_object.js
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Expand Up @@ -17,6 +17,10 @@ const BLACKLIST = new Set(['env', 'mainModule', '_events']);
// mimic it (see https://nodejs.org/api/process.html#process_process_env).

function createProcessEnv() {
if (typeof Proxy === 'undefined') {
return deepCyclicCopy(process.env);
}

// $FlowFixMe: Apparently Flow does not understand that this is a prototype.
const proto: Object = Object.getPrototypeOf(process.env);
const real = Object.create(proto);
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