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Node says that cluster.isMaster is deprecated and we should use cluster.isPrimary. But, while isMaster is returning me true without problem, I getting undefined when I try cluster.isPrimary:

const cluster = require("cluster");

console.log(cluster.isPrimary); /// undefined

console.log(cluster.isMaster); /// true

Why is this happening?

bahejam379
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4 Answers4

4

Make sure you are on at least Node version 16.0.0

you can see this by running this command in your terminal:

node --version
about14sheep
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  • i'm in the current LTS, version 14.18.1 – bahejam379 Oct 17 '21 at 21:15
  • as per node documentation isPrimary was added in version 16.0.0 of nodejs. You should update your node version to the latest release to use that functionality. isPrimary docs: https://nodejs.org/api/cluster.html#cluster_cluster_isprimary nodejs download: https://nodejs.org/en/ – about14sheep Oct 17 '21 at 22:01
4

Use node v16+ and add "esModuleInterop": true into tsconfig.json file.

Ion Leu
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In Node 18, I imported the module as suggested in an example from the official docs:

import cluster from 'node:cluster';

I do have Typescript 4.2, and I do have the "esModuleInterop": true flag set in tsconfig.json and worked.

Mariano Ruiz
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0

I used this statement and with node v19 and works for me:

import cluster, { Worker } from 'cluster'
Tyler2P
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Manmath Waghmare
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