[App Service] az webapp create/list-runtimes: Change Node.js 26 runtime identifier

[aamos-company]

🤖 PR Validation — ️✔️ All clear

Breaking Changes	Tests
️✔️ None	️✔️ 130/130

az webapp create,  az webapp list-runtimes

Description

Use  NODE|26 as the standard Node.js 26 runtime identifier for both Windows and Linux App Service plans by dropping LTS / -lts from the identifier. LTS is lifecycle metadata, not part of the Node version itself. Existing identifiers for Node.js 24 and earlier remain unchanged and supported.

Previously:

Testing Guide

azdev test TestStackRuntimeNodeStandardization
azdev style appservice

The added tests verify:

• Node 26 displays as  NODE|26  on both platforms.
• Linux configuration is exactly  NODE|26 .
• Windows configuration remains  ~26 .
•  NODE|26-lts  and  NODE|26LTS  resolve successfully.
• Node 24 identifiers remain unchanged.
• Current and LTS API entries are deduplicated.
• GitHub Actions returns  NODE|26  and version  26.x .

---

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• The PR title and description has followed the guideline in Submitting Pull Requests.

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• I adhere to the Error Handling Guidelines.

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[microsoft-github-policy-service]

Thank you for your contribution aamos-company! We will review the pull request and get back to you soon.

[Yong Zhang (yonzhan)]

AppService

[aamos-company]

recognizes these case-insensitive forms:
NODE|26
NODE|26-lts
NODE|26LTS

All become:
NODE|26'

For all versions >=26

[aamos-company]

If the stacks API returns:

NODE|26-lts

the resulting runtime object is:

display_name: NODE|26
configs:
linux_fx_version: NODE|26
github_actions_version: 26.x

[aamos-company]

Note:
az webapp config set --linux-fx-version NODE|26-lts
 --linux-fx-version NODE|26-lts bypasses runtime resolution and sends that value directly as  linuxFxVersion in the ARM update request

It's made clear in the help output that --runtime canonicalizes the input. This is not the same case for the --linux-fx-version which is taken as a raw string. I am hesitant to change that, but open to feedback. From my understanding of the email thread, ARM will continue to accept lts so this should not be an issue.

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[Copilot]

Pull request overview

This PR standardizes the Node.js 26 App Service runtime identifier to NODE|26 (dropping -lts / LTS) across az webapp create, az webapp list-runtimes, and GitHub Actions runtime handling, while keeping older Node identifiers unchanged for compatibility.

Changes:

• Standardize Node 26 runtime names during stack parsing and runtime resolution so NODE|26-lts/NODE|26LTS map to NODE|26.
• Deduplicate stack entries after parsing to avoid duplicated runtimes (notably when API returns both “current” and “LTS” variants).
• Add/adjust tests to validate Node 26 standardization, legacy Node behavior, and GitHub Actions runtime normalization.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/azure-cli/azure/cli/command_modules/appservice/tests/latest/test_webapp_commands_thru_mock.py	Updates GitHub Actions runtime test expectations and adds new regression tests for Node 26 runtime standardization/deduping.
src/azure-cli/azure/cli/command_modules/appservice/custom.py	Implements Node 26 runtime name standardization, stack deduplication, and ensures GitHub Actions/runtime info paths return standardized names.

---

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/azp run

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Successfully started running 3 pipeline(s).

[azure-client-tools-agent]

Live test results — azdev test --live --series (changed test files only)

✅ PASS

Selectors: test_webapp_commands_thru_mock (module)
PR head ref: developer/amberamos/standardizenode
PR head sha: 1fe15cb4c24134eaf01df9ce836cf29407277fa4
PR base ref: dev
New test files in PR: false

Changed test files run

src/azure-cli/azure/cli/command_modules/appservice/tests/latest/test_webapp_commands_thru_mock.py

Workflow run: https://github.com/Azure/issue-sentinel/actions/runs/32222174307

Last 80 lines of azdev output

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azure-cli/src/azure-cli/azure/cli/command_modules/appservice/tests/latest/test_webapp_commands_thru_mock.py::TestStackRuntimeNodeStandardization::test_node_26_transition_identifiers_are_deduplicated PASSED [ 89%]
azure-cli/src/azure-cli/azure/cli/command_modules/appservice/tests/latest/test_webapp_commands_thru_mock.py::TestStackRuntimeNodeStandardization::test_node_26_uses_standard_identifier_on_both_platforms PASSED [ 90%]
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azure-cli/src/azure-cli/azure/cli/command_modules/appservice/tests/latest/test_webapp_commands_thru_mock.py::TestStackRuntimeJavaSELinux::test_get_java_runtimes_from_container_settings_reads_mapping PASSED [ 97%]
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- generated xml file: /home/runner/work/issue-sentinel/issue-sentinel/test-output/results.xml -
============================== 86 passed in 2.54s ==============================

Posted by agent-assist live-test workflow.

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CI Summary

This PR currently has failing checks that need attention before it can be merged:

• ❌ Azure.azure-cli (Build) — the build check failed. See: https://github.com/Azure/azure-cli/runs/95977751452
• ❌ Check the Format of Pull Request Title and Content — the PR title/description doesn't meet the required format. See: https://github.com/Azure/azure-cli/runs/95977747704

Please review the linked check logs, address the build failure, and update the PR title/description to match the required format (see the PR template and title guidelines). Once fixed, CI will re-run automatically.

[Teresa Ritorto (teresaritorto)]

/azp run

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