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fix: Guard against process not being defined (#911)

Webpack 5 doesn't shim Node's process object by default anymore. Only instances of process.env.NODE_ENV are replaced statically. This means that unguarded checks of process.env will crash in browser environments (such as Karma).

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- index.js

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`‎src/index.js‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -5,7 +5,7 @@ import {cleanup} from './pure'`
`5`	`5`	`// this ensures that tests run in isolation from each other`
`6`	`6`	// if you don't like this then either import the `pure` module
`7`	`7`	`// or set the RTL_SKIP_AUTO_CLEANUP env variable to 'true'.`
`8`		`-if (!process.env.RTL_SKIP_AUTO_CLEANUP) {`
	`8`	`+if (typeofprocess==="undefined"\|\|!process.env?.RTL_SKIP_AUTO_CLEANUP) {`
`9`	`9`	`// ignore teardown() in code coverage because Jest does not support it`
`10`	`10`	`/* istanbul ignore else */`
`11`	`11`	`if (typeof afterEach === 'function') {`

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Commit 8a1c8e9

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`‎src/index.js‎`

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