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content="1"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 29.1</span><div class="tocCollapsible_wXna theme-doc-toc-mobile tocMobile_Ojys"><button type="button" class="clean-btn tocCollapsibleButton_iI2p">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Environment Variables</h1></header><p>Jest sets the following environment variables:</p><h3 class="anchor anchorWithStickyNavbar_JmGV" id="node_env"><code>NODE_ENV</code><a href="#node_env" class="hash-link" aria-label="Direct link to node_env" title="Direct link to node_env"></a></h3><p>Set to <code>'test'</code> if it's not already set to something else.</p><h3 class="anchor anchorWithStickyNavbar_JmGV" id="jest_worker_id"><code>JEST_WORKER_ID</code><a href="#jest_worker_id" class="hash-link" aria-label="Direct link to jest_worker_id" title="Direct link to jest_worker_id"></a></h3><p>Each worker process is assigned a unique id (index-based that starts with 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