Override ember-cli's tsconfig.json see: ember-cli/ember-cli#10611 and ember-cli/ember-cli#10613 and ember-cli/ember-cli#10612

Author: NullVoxPopuli

files/test-app-overrides/tsconfig.json

@@ -0,0 +1,25 @@
+{
+  "extends": "@tsconfig/ember/tsconfig.json",
+  "glint": {
+    "environment": ["ember-loose", "ember-template-imports"]
+  },
+  "compilerOptions": {
+    "skipLibCheck": true,
+    "noEmit": true,
+    "noEmitOnError": false,
+    "declaration": false,
+    "declarationMap": false,
+    // The combination of `baseUrl` with `paths` allows Ember's classic package
+    // layout, which is not resolvable with the Node resolution algorithm, to
+    // work with TypeScript.
+    "baseUrl": ".",
+    "paths": {
+      "<%= testAppInfo.packageName %>/tests/*": ["tests/*"],
+      "<%= testAppInfo.packageName %>/*": ["app/*"],
+      "*": ["types/*"]
+    },
+    "types": [
+      "ember-source/types",
+    ]
+  }
+}