build: fix typescript config for test folders

This change fixes the errors in VS Code for the test files.

Author: NoNameProvided

test/tsconfig.json

@@ -0,0 +1,5 @@
+{
+  // This TS config is added for VS Code, so it understand the test files are
+  // using the tsconfig.spec.json file instead of the default one.
+  "extends": "../tsconfig.spec.json",
+}

tsconfig.json

@@ -5,7 +5,7 @@
     "target": "es2018",
     "lib": ["es2018"],
     "outDir": "build/node",
-    "rootDir": "./src",
+    "rootDirs": ["./src"],
     "strict": true,
     "sourceMap": true,
     "removeComments": false,

tsconfig.spec.json

@@ -1,6 +1,7 @@
 {
   "extends": "./tsconfig.json",
   "compilerOptions": {
+    "rootDirs": ["./src", "./test"],
     "strict": false,
     "strictPropertyInitialization": false,
     "sourceMap": false,