Consolidate vitest CI & coverage (#33808)

* Consolidate modules vitest coverage

* Use vite-common as base for modules vitest config

* Make knip happier

* Fix coverage paths

* Place modules unit tests alongside src

* Switch to defineProject for better type safety

* Consolidate vitest CI & coverage

Kills off vite-common

* Update comment

* Update lockfile

* Fix shared-components vitest config

* Soften eslint config for tests in modules

* Run eslint on modules/playwright dir too

* Make tsc happy

packages/module-api/package.json

@@ -37,14 +37,12 @@
         "coverage:diff": "diff-cover --config-file ../../diff-cover.toml coverage/lcov.info"
     },
     "devDependencies": {
-        "@element-hq/vite-common": "workspace:*",
         "@matrix-org/react-sdk-module-api": "^2.5.0",
         "@microsoft/api-extractor": "^7.49.1",
         "@types/node": "^22.10.7",
         "@types/react": "catalog:",
         "@types/react-dom": "catalog:",
         "@types/semver": "^7.5.8",
-        "@vitest/coverage-v8": "catalog:",
         "matrix-widget-api": "^1.17.0",
         "rollup-plugin-external-globals": "^0.13.0",
         "semver": "^7.6.3",

packages/module-api/vite.config.ts

@@ -7,43 +7,38 @@ Please see LICENSE files in the repository root for full details.
 
 import { dirname, resolve } from "node:path";
 import { fileURLToPath } from "node:url";
-import { defineConfig, mergeConfig } from "vitest/config";
+import { defineConfig } from "vitest/config";
 import dts from "unplugin-dts/vite";
 import externalGlobals from "rollup-plugin-external-globals";
-import baseConfig from "@element-hq/vite-common/vite.config";
 
 import packageJson from "./package.json" with { type: "json" };
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 
-export default mergeConfig(
-    baseConfig,
-    defineConfig({
-        build: {
-            lib: {
-                entry: resolve(__dirname, "src/index.ts"),
-                name: "element-web-plugin-engine",
-                fileName: "element-web-plugin-engine",
-            },
-            outDir: "lib",
-            target: "esnext",
-            sourcemap: true,
+export default defineConfig({
+    build: {
+        lib: {
+            entry: resolve(__dirname, "src/index.ts"),
+            name: "element-web-plugin-engine",
+            fileName: "element-web-plugin-engine",
         },
-        plugins: [
-            dts(),
-            externalGlobals({
-                // Reuse React from the host app
-                react: "window.React",
-            }),
-        ],
-        define: {
-            // We cannot use `process.env.npm_package_version` as when building element-web with module-api set to `workspace`
-            // this would contain the version of element-web rather than that of the module-api.
-            __VERSION__: JSON.stringify(packageJson.version),
-            // Use production mode for the build as it is tested against production builds of Element Web,
-            // this is required for React JSX versions to be compatible.
-            process: { env: { NODE_ENV: "production" } },
-        },
-    }),
-    true,
-);
+        outDir: "lib",
+        target: "esnext",
+        sourcemap: true,
+    },
+    plugins: [
+        dts(),
+        externalGlobals({
+            // Reuse React from the host app
+            react: "window.React",
+        }),
+    ],
+    define: {
+        // We cannot use `process.env.npm_package_version` as when building element-web with module-api set to `workspace`
+        // this would contain the version of element-web rather than that of the module-api.
+        __VERSION__: JSON.stringify(packageJson.version),
+        // Use production mode for the build as it is tested against production builds of Element Web,
+        // this is required for React JSX versions to be compatible.
+        process: { env: { NODE_ENV: "production" } },
+    },
+});

packages/module-api/vitest.config.ts

@@ -0,0 +1,20 @@
+/*
+Copyright 2025 New Vector Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+import { defineProject } from "vitest/config";
+
+import viteConfig from "./vite.config";
+
+export default defineProject({
+    test: {
+        environment: "node",
+        pool: "threads",
+        globals: false,
+        include: ["src/**/*.test.{ts,tsx}"],
+    },
+    define: viteConfig.define,
+});