test: reduce memory footprint (#12517)

* test: reduce memory footprint

* test: use new ts config

Co-authored-by: Rhys Arkins <rhys@arkins.net>

jest.config.ts

@@ -36,6 +36,7 @@ const config: InitialOptionsTsJest = {
   testRunner: 'jest-circus/runner',
   globals: {
     'ts-jest': {
+      tsconfig: '<rootDir>/tsconfig.spec.json',
       diagnostics: false,
       isolatedModules: true,
     },

tsconfig.spec.json

@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig",
+  "compilerOptions": {
+    "allowJs": false,
+    "checkJs": false
+  }
+}