node/lib/cluster.js

// Copyright Joyent, Inc. and other Node contributors.
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//
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'use strict';

const {
  ObjectPrototypeHasOwnProperty: ObjectHasOwn,
} = primordials;

const childOrPrimary = ObjectHasOwn(process.env, 'NODE_UNIQUE_ID') ? 'child' : 'primary';
module.exports = require(`internal/cluster/${childOrPrimary}`);