build: adapt ts and jest config

jest.config.js

@@ -1,14 +1,8 @@
 module.exports = {
-    "preset": "jest-preset-angular",
-    "resetMocks": true,
-    "setupFilesAfterEnv": [
-        "<rootDir>/src/setup-jest.ts"
-    ],
-    "testMatch": [
-        "**/+(*.)+(spec|test).+(ts)?(x)"
-    ],
-    "coverageReporters": [
-        "html",
-        "lcov"
-    ]
-};
+    preset: 'jest-preset-angular',
+    resetMocks: true,
+    setupFilesAfterEnv: ['<rootDir>/src/setup-jest.ts'],
+    testMatch: ['**/+(*.)+(spec|test).+(ts)?(x)'],
+    coverageReporters: ['html', 'lcov'],
+    transformIgnorePatterns: ['node_modules/(?!.*.mjs$|@datorama/akita)'],
+};

tsconfig.json

@@ -8,7 +8,7 @@
         "moduleResolution": "node",
         "emitDecoratorMetadata": true,
         "experimentalDecorators": true,
-        "target": "es5",
+        "target": "es6",
         "typeRoots": ["node_modules/@types"],
         "lib": ["es2017", "es2016", "es2015", "dom"],
         "resolveJsonModule": true,