Initial Commit

packages/testkit/testing/testing-dom/src/config/detect-environment.ts

@@ -0,0 +1,32 @@
+/**
+ * Detect the appropriate vitest `environment` for a package.
+ *
+ * Order of precedence:
+ * 1. Explicit override
+ * 2. Package depends on `react` / `react-dom` → `happy-dom`
+ * 3. Package depends on `jsdom` → `jsdom`
+ * 4. Default: `node`
+ */
+
+export type TestEnvironment = "node" | "happy-dom" | "jsdom";
+
+interface MinimalPackageJson {
+    dependencies?: Record<string, string>;
+    devDependencies?: Record<string, string>;
+    peerDependencies?: Record<string, string>;
+}
+
+export function detectEnvironment(
+    pkg: MinimalPackageJson,
+    override?: TestEnvironment
+): TestEnvironment {
+    if (override) return override;
+    const deps = {
+        ...(pkg.dependencies ?? {}),
+        ...(pkg.devDependencies ?? {}),
+        ...(pkg.peerDependencies ?? {}),
+    };
+    if ("react" in deps || "react-dom" in deps) return "happy-dom";
+    if ("jsdom" in deps) return "jsdom";
+    return "node";
+}