build!: support Node.js 22, 24, and 26

.azure-pipelines/daily-ci-build.yml

@@ -46,7 +46,7 @@ extends:
               - task: NodeTool@0
                 displayName: Set up Node.js
                 inputs:
-                  versionSpec: '20.x'
+                  versionSpec: '22.x'
 
               - task: npm@1
                 displayName: Install dependencies

.github/workflows/build.yml

@@ -21,8 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [20.x, 22.x]
-        # Single version should work for compilation testing
+        node-version: [22.x, 24.x, 26.x]
 
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

CONTRIBUTING.md

@@ -6,6 +6,19 @@ All pull requests should be submitted against the **main** branch or a specific
 
 When a new package is about to be released, the release PR will be merged into `main`. The package will be generated from `main`.
 
+## Development prerequisites
+
+Use Node.js 22.x, 24.x, or 26.x. GitHub Actions builds all three supported versions; Azure daily-build and release pipelines use Node.js 22.x.
+
+Install dependencies and build all workspaces from the repository root:
+
+```shell
+npm ci
+npm run build
+```
+
+After building, run the integration tests with `npm test`. These tests call Microsoft Graph and require `TENANT_ID`, `CLIENT_ID`, `CLIENT_SECRET`, and `USER_ID` environment variables for a test tenant with appropriate permissions. GitHub Actions runs them only when its configured client secret is available.
+
 ## Commit message format
 
 To support our automated release process, pull requests are required to follow the [Conventional Commit](https://www.conventionalcommits.org/en/v1.0.0/)

README.md

@@ -8,6 +8,8 @@ Get started with the Microsoft Graph SDK for Typescript by integrating the [Micr
 
 ## 1. Installation
 
+Supported Node.js versions are 22.x, 24.x, and 26.x.
+
 ```shell
 # this will install the main package
 npm install @microsoft/msgraph-sdk