[REGRESSION]: IISWebAppDeploymentOnMachineGroupV0 - globalThis is not defined

[jwdixon]

New issue checklist

• I searched for existing GitHub issues
• I read pipeline troubleshooting guide
• I checked how to collect logs

Task name

IISWebAppDeploymentOnMachineGroupV0

Breaking task version

0.274.0

Last working task version

0.269.0

Regression Description

When attempting to run the task IISWebAppDeploymentOnMachineGroupV0, it fails with the error "globalThis is not defined." The expectation is that running the task is successful.

Environment type (Please select at least one enviroment where you face this issue)

• Self-Hosted
• Microsoft Hosted
• VMSS Pool
• Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Azure DevOps Server Version (if applicable)

No response

Operation system

Windows Server 2012 R2

Relevant log output

2026-06-04T14:20:59.1822757Z ##[error]Unhandled: globalThis is not defined
2026-06-04T14:20:59.1872910Z ##[error]ReferenceError: globalThis is not defined
    at Object.<anonymous> (C:\azagent\A1\_work\_tasks\IISWebAppDeploymentOnMachineGroup_1b467810-6725-4b6d-accd-886174c09bba\0.274.2\node_modules\readable-stream\lib\ours\errors.js:15:24)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (C:\azagent\A1\_work\_tasks\IISWebAppDeploymentOnMachineGroup_1b467810-6725-4b6d-accd-886174c09bba\0.274.2\node_modules\readable-stream\lib\ours\util.js:7:5)
    at Module._compile (internal/modules/cjs/loader.js:778:30)

Full task logs with system.debug enabled

2026-06-04T14:20:56.7754069Z ##[section]Starting: IIS Web App Deploy
2026-06-04T14:20:57.0221621Z ==============================================================================
2026-06-04T14:20:57.0221868Z Task : IIS web app deploy
2026-06-04T14:20:57.0222032Z Description : Deploy a website or web application using Web Deploy
2026-06-04T14:20:57.0222176Z Version : 0.274.2
2026-06-04T14:20:57.0222340Z Author : Microsoft Corporation
2026-06-04T14:20:57.0222566Z Help : https://docs.microsoft.com/azure/devops/pipelines/tasks/deploy/iis-web-app-deployment-on-machine-group
2026-06-04T14:20:57.0222781Z ==============================================================================
2026-06-04T14:20:59.1822757Z ##[error]Unhandled: globalThis is not defined
2026-06-04T14:20:59.1872910Z ##[error]ReferenceError: globalThis is not defined
at Object. (C:\azagent\A1_work_tasks\IISWebAppDeploymentOnMachineGroup_1b467810-6725-4b6d-accd-886174c09bba\0.274.2\node_modules\readable-stream\lib\ours\errors.js:15:24)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Module.require (internal/modules/cjs/loader.js:692:17)
at require (internal/modules/cjs/helpers.js:25:18)
at Object. (C:\azagent\A1_work_tasks\IISWebAppDeploymentOnMachineGroup_1b467810-6725-4b6d-accd-886174c09bba\0.274.2\node_modules\readable-stream\lib\ours\util.js:7:5)
at Module._compile (internal/modules/cjs/loader.js:778:30)
2026-06-04T14:20:59.1876159Z ##[section]Finishing: IIS Web App Deploy

Repro steps

[v-abhishera]

Hi @jwdixon the fix has been made in 275 version of the task and the deployments will be completed by third week of June.

As a workaround could you please use the YAML pipeline with the 0.269.0 version of the task.

[manolerazvan]

Hello and thank you for reporting this issue. To narrow this done, could you share a few details about the agent that hit this ?

The globalThis is not defined error tells us the task was loaded under the Node 10 handler, which means either the agent doesn't have a newer Node handler installed, or it's configured to prefer Node 10. The Node version you have installed on the OS itself doesn't matter here, the agent uses its own bundled Node runtimes.

Could you help us confirm by answering the following:

1. Is this only happening on your self-hosted agent, or also on Microsoft-hosted? The log path C:\azagent\A1_work... looks self-hosted; we'd expect Microsoft-hosted to be unaffected because those images always have Node 16/20/24. If you can reproduce on a Microsoft-hosted job, please share that run too.
2. What is the agent version? You can find it at the top of the job log (look for Agent name: ... / Agent version: ...), or in Settings > About on the agent machine.
3. Which Node handlers are installed on the agent? On the agent box, please run:
   Get-ChildItem C:\azagent\A1\externals\ -Directory | Select-Object Name
   ``` We're looking for folders like node, `node10`, `node16`, `node20_1`, `node24`. If only `node` / `node10` is present, that's the cause > the agent is too old to have newer handlers.
4. Can you update the agent to the latest version? Newer agents ship newer Node handlers; in most cases this resolves the symptom without any change to your pipeline. Upgrade instructions: https://learn.microsoft.com/azure/devops/pipelines/agents/agents#update-agents.
5. Are you setting any of these in the environment or pipeline? AGENT_USE_NODE10, AGENT_USE_NODE, or a Demands: entry that pins Node, anything that would force the older handler.

Once we have the above, we can confirm whether this is fully fixed by task version 0.275.0 (which rolls back the archiver bump that introduced the Node-10-incompatible readable-stream@4) or whether you'll also need an agent update.