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Checks for existence of process before process.env for esm build #2409

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Checks for existence of process before process.env for esm build #2409

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3 changes: 2 additions & 1 deletion src/jsutils/instanceOf.js
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,8 @@ declare function instanceOf(

// See: https://expressjs.com/en/advanced/best-practice-performance.html#set-node_env-to-production
// See: https://webpack.js.org/guides/production/
export default process.env.NODE_ENV === 'production'
export default typeof process === 'undefined' ||
process.env.NODE_ENV === 'production'
? /* istanbul ignore next (See: https://github.com/graphql/graphql-js/issues/2317) */
// eslint-disable-next-line no-shadow
function instanceOf(value: mixed, constructor: mixed) {
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