Migrate to vitest

.claude/agents/engineer.md

@@ -146,7 +146,7 @@ Modified files: [list from Step 2]
 Run these checks:
 
 1. `npm run build` (builds all packages in dependency order via tsc + esbuild)
-2. `npm test` (runs Jest tests across all packages)
+2. `npm test` (runs Vitest tests across all packages)
 3. `npm run lint` (ESLint + Prettier check)
 
 For single-package changes, you may scope:

.claude/agents/pr-reviewer.md

@@ -67,7 +67,7 @@ Run the full build and test suite:
 # Build all packages (tsc + esbuild, respects dependency order)
 npm run build
 
-# Run all tests (Jest across all packages)
+# Run all tests (Vitest across all packages)
 npm test
 
 # Lint check (ESLint + Prettier)

.devcontainer/devcontainer.json

@@ -2,16 +2,14 @@
   "name": "Exceptionless.JavaScript",
   "image": "mcr.microsoft.com/vscode/devcontainers/typescript-node:latest",
   "extensions": [
-    "andys8.jest-snippets",
     "dbaeumer.vscode-eslint",
     "editorconfig.editorconfig",
     "esbenp.prettier-vscode",
-    "firsttris.vscode-jest-runner",
-    "hbenl.vscode-test-explorer",
     "juancasanova.awesometypescriptproblemmatcher",
     "ryanluker.vscode-coverage-gutters",
-    "streetsidesoftware.code-spell-checker"
+    "streetsidesoftware.code-spell-checker",
+    "vitest.explorer"
   ],
   "forwardPorts": [3000],
-  "postCreateCommand": "npm install"
+  "postCreateCommand": "npm ci"
 }

.github/workflows/build.yml

@@ -23,7 +23,20 @@ jobs:
         with:
           fetch-depth: 0
       - name: Build Reason
-        run: "echo ref: ${{github.ref}} event: ${{github.event_name}}"
+        shell: bash
+        run: |
+          branch=${GITHUB_REF##*/}.
+          if [[ "$branch" = "main." ]]; then
+            branch=""
+          elif [[ "$branch" = "master." ]]; then
+            branch=""
+          elif [[ "${GITHUB_REF}" = refs/tags* ]]; then
+            branch=""
+          elif [[ "${GITHUB_REF}" = refs/pull* ]]; then
+            branch=""
+          fi
+          echo "GIT_BRANCH_SUFFIX=$branch" >> $GITHUB_ENV
+          echo "ref: $GITHUB_REF event: $GITHUB_EVENT_NAME branch_suffix: $branch"
       - name: Setup Node.js environment
         uses: actions/setup-node@v6
         with:
@@ -37,18 +50,29 @@ jobs:
       - name: Setup .NET SDK for MinVer
         uses: actions/setup-dotnet@v5
         with:
-          dotnet-version: "8.0.x"
-      - name: Set Min Version
-        uses: Stelzi79/action-minver@3.0.1
-        id: version
-        with:
-          minimum-major-minor: 3.0
-          tag-prefix: v
+          dotnet-version: "10.0.x"
       - name: Build Version
+        id: version
+        shell: bash
         run: |
+          dotnet tool install --global minver-cli --version 7.0.0
+          version=$(minver --tag-prefix v --default-pre-release-identifiers "preview.${GIT_BRANCH_SUFFIX}0" --minimum-major-minor 3.0)
+
+          # If on a non-main branch, insert branch name before the height (last numeric segment)
+          if [ -n "$GIT_BRANCH_SUFFIX" ]; then
+            branch_name="${GIT_BRANCH_SUFFIX%.}"
+            if [[ "$version" != *"$branch_name"* ]]; then
+              version=$(echo "$version" | sed -E "s/\.([0-9]+)$/.${GIT_BRANCH_SUFFIX}\1/")
+            fi
+          fi
+
+          echo "version=$version" >> $GITHUB_OUTPUT
+          echo "Version: $version"
+          echo "### Version: $version" >> $GITHUB_STEP_SUMMARY
+
           npm install --global replace-in-files-cli
-          replace-in-files --string="3.0.0-dev" --replacement=${{steps.version.outputs.version}} packages/core/src/configuration/Configuration.ts
-          replace-in-files --string="3.0.0-dev" --replacement=${{steps.version.outputs.version}} **/package*.json
+          replace-in-files --string="3.0.0-dev" --replacement=$version packages/core/src/configuration/Configuration.ts
+          replace-in-files --string="3.0.0-dev" --replacement=$version **/package*.json
           npm ci
       - name: Build
         run: npm run build
@@ -62,14 +86,19 @@ jobs:
         env:
           NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
       - name: Setup GitHub CI Node.js environment
-        if: github.event_name != 'pull_request' && matrix.os == 'ubuntu-latest'
+        if: github.event_name != 'pull_request' && startsWith(github.ref, 'refs/heads/') && matrix.os == 'ubuntu-latest' && contains(steps.version.outputs.version, '-')
         uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node_version }}
           registry-url: "https://npm.pkg.github.com"
           scope: "@exceptionless"
       - name: Push GitHub CI Packages
-        if: github.event_name != 'pull_request' && matrix.os == 'ubuntu-latest'
-        run: npm publish --workspaces --access public
+        if: github.event_name != 'pull_request' && startsWith(github.ref, 'refs/heads/') && matrix.os == 'ubuntu-latest' && contains(steps.version.outputs.version, '-')
+        shell: bash
+        run: |
+          TAG_BRANCH="${GIT_BRANCH_SUFFIX%.}"
+          TAG_BRANCH="${TAG_BRANCH:-main}"
+          TAG_BRANCH="${TAG_BRANCH//\//-}"
+          npm publish --workspaces --access public --tag "ci-${TAG_BRANCH}" || true
         env:
           NODE_AUTH_TOKEN: ${{secrets.GITHUB_TOKEN}}

.vscode/extensions.json

@@ -1,14 +1,12 @@
 {
   "recommendations": [
-    "andys8.jest-snippets",
     "davidanson.vscode-markdownlint",
     "dbaeumer.vscode-eslint",
     "editorconfig.editorconfig",
     "esbenp.prettier-vscode",
-    "firsttris.vscode-jest-runner",
-    "hbenl.vscode-test-explorer",
     "juancasanova.awesometypescriptproblemmatcher",
     "ryanluker.vscode-coverage-gutters",
-    "streetsidesoftware.code-spell-checker"
+    "streetsidesoftware.code-spell-checker",
+    "vitest.explorer"
   ]
 }

.vscode/launch.json

@@ -14,27 +14,27 @@
       "name": "Test",
       "request": "launch",
       "type": "node",
-      "program": "${workspaceFolder}/node_modules/.bin/jest",
-      "args": ["--runInBand"],
+      "program": "${workspaceFolder}/node_modules/.bin/vitest",
+      "args": ["--run"],
       "console": "integratedTerminal",
       "internalConsoleOptions": "neverOpen",
       "disableOptimisticBPs": true,
       "windows": {
-        "program": "${workspaceFolder}/node_modules/jest/bin/jest"
+        "program": "${workspaceFolder}/node_modules/vitest/vitest.mjs"
       },
       "cwd": "${workspaceRoot}"
     },
     {
       "name": "Test Current File",
       "request": "launch",
       "type": "node",
-      "program": "${workspaceFolder}/node_modules/.bin/jest",
-      "args": ["${fileBasenameNoExtension}"],
+      "program": "${workspaceFolder}/node_modules/.bin/vitest",
+      "args": ["--run", "${fileBasenameNoExtension}"],
       "console": "integratedTerminal",
       "internalConsoleOptions": "neverOpen",
       "disableOptimisticBPs": true,
       "windows": {
-        "program": "${workspaceFolder}/node_modules/jest/bin/jest"
+        "program": "${workspaceFolder}/node_modules/vitest/vitest.mjs"
       },
       "cwd": "${workspaceRoot}"
     }

.vscode/settings.json

@@ -36,6 +36,5 @@
     "webcompat"
   ],
   "eslint.validate": ["javascript", "typescript"],
-  "deno.enable": false,
-  "jest.jestCommandLine": "npm test --"
+  "deno.enable": false
 }

AGENTS.md

@@ -262,10 +262,10 @@ Before marking work complete, verify:
 
 ### Framework
 
-- **Jest** with **ts-jest** preset
-- **`@jest/globals`** for imports (`describe`, `test`, `expect`)
+- **Vitest** as the test runner
+- **`vitest`** for imports (`describe`, `test`, `expect`, `beforeEach`, `afterEach`)
 - **jsdom** test environment for browser packages, **node** for the node package
-- **jest-ts-webcompat-resolver** for ESM import resolution
+- **vitest.config.ts** at root defines test projects for each package
 
 ### Test Structure
 
@@ -288,8 +288,7 @@ packages/core/test/
 Follow the Arrange-Act-Assert pattern:
 
 ```typescript
-import { describe, test } from "@jest/globals";
-import { expect } from "expect";
+import { describe, test, expect } from "vitest";
 
 import { ExceptionlessClient } from "../src/ExceptionlessClient.js";
 
@@ -330,7 +329,7 @@ npm test --workspace=packages/browser
 npm run test:watch --workspace=packages/core
 
 # Run tests matching a pattern
-npx jest --testPathPattern="ExceptionlessClient"
+npx vitest --run --testNamePattern="ExceptionlessClient"
 ```
 
 ### Test Principles (FIRST)

eslint.config.mjs

@@ -1,13 +1,11 @@
 import eslint from "@eslint/js";
 import { defineConfig } from "eslint/config";
 import eslintConfigPrettier from "eslint-config-prettier";
-import jest from "eslint-plugin-jest";
+import vitest from "@vitest/eslint-plugin";
 import tseslint from "typescript-eslint";
 
 export default defineConfig(
-  {
-    ignores: ["**/dist/", "**/node_modules/", ".agents/", "example/", "jest-resolver.cjs"]
-  },
+  { ignores: ["**/dist/", "**/node_modules/", ".agents/", "example/"] },
   eslint.configs.recommended,
   {
     extends: tseslint.configs.recommendedTypeChecked,
@@ -36,12 +34,12 @@ export default defineConfig(
   eslintConfigPrettier,
   {
     files: ["**/test/**/*.ts"],
-    extends: [jest.configs["flat/recommended"]],
+    plugins: vitest.configs.recommended.plugins,
     rules: {
-      "jest/valid-title": "off",
-      "jest/valid-describe-callback": "off",
-      "jest/no-export": "off",
-      "jest/no-done-callback": "warn"
+      ...vitest.configs.recommended.rules,
+      "vitest/valid-title": "off",
+      "vitest/valid-describe-callback": "off",
+      "vitest/no-done-callback": "warn"
     }
   }
 );

example/react/package.json

@@ -9,8 +9,7 @@
   },
   "eslintConfig": {
     "extends": [
-      "react-app",
-      "react-app/jest"
+      "react-app"
     ]
   },
   "browserslist": {
@@ -26,7 +25,6 @@
     ]
   },
   "devDependencies": {
-    "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",
     "@testing-library/user-event": "^14.6.1",
     "@vitejs/plugin-react": "^6.0.1",