Update Jest to use Babel for export support in packages

rpg-dice-roller strikes again, with ES6 and ts-jest. Using Babel with TypeScript resolves the issue.

__tests__/utilities/WorldUtilities.tests.ts

@@ -0,0 +1,14 @@
+import World from "@/models/World";
+import { startNextMoment } from '@/utilities/WorldUtilities';
+
+const world = new World();
+
+test('World starts at moment 0', () => {
+	expect(world.currentMoment).toBe(0);
+});
+
+test('Starting next moment increments moment by 1', () => {
+	const startMoment = world.currentMoment;
+	startNextMoment(world);
+	expect(world.currentMoment).toBe(startMoment + 1);
+});

babel.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+	presets: [
+		['@babel/preset-env', {targets: {node: 'current'}}],
+		'@babel/preset-typescript',
+	]
+}

jest.config.js

@@ -1,26 +1,28 @@
+const modulesWithExport = ['rpg-dice-roller'].join('|');
 
 module.exports = {
-  preset: 'ts-jest',
   testEnvironment: 'node',
   roots: [
-    '<rootDir>'
+    '<rootDir>/src',
+    '<rootDir>/__tests__'
   ],
   modulePaths: [
     '<rootDir>'
   ],
   // An array of glob patterns indicating a set of files for which coverage information should be collected
   collectCoverageFrom: [
-    "<rootDir>/src/**/*.ts",
-    "!<rootDir>/src/**/*.d.ts"
+	"<rootDir>/src/**/*.ts",
+	// Exclude Vue.js main file.
+	"!<rootDir>/src/main.ts",
+	"!<rootDir>/src/**/*.d.ts",
+	'!**/node_modules/**',
+  ],
+  transformIgnorePatterns: [
+    `/node_modules/(?!${modulesWithExport})`
   ],
-
   // The directory where Jest should output its coverage files
   //coverageDirectory: "coverage",
-  /*moduleNameMapper: {
+  moduleNameMapper: {
     '^@/(.*)$': '<rootDir>/src/$1'
-  },*/
-  globals: {
-    'ts-jest': {
-    }
   }
 };

package.json

@@ -9,7 +9,8 @@
     "eslint": "eslint ./src --ext .js,.jsx,.ts,.tsx,.vue || (exit 0)",
     "docs": "typedoc --out docs src && http-server docs",
     "test": "jest",
-    "test:coverage": "jest --coverage"
+    "test:coverage": "jest --coverage",
+    "test:coverageWatch": "jest --coverage --watchAll"
   },
   "dependencies": {
     "@vue/eslint-config-typescript": "^5.0.2",
@@ -21,17 +22,20 @@
     "vue-property-decorator": "^9.0.0"
   },
   "devDependencies": {
+    "@babel/core": "^7.11.0",
+    "@babel/preset-env": "^7.11.0",
+    "@babel/preset-typescript": "^7.10.4",
     "@types/jest": "^26.0.8",
     "@typescript-eslint/eslint-plugin": "^3.7.1",
     "@typescript-eslint/parser": "^3.7.1",
     "@vue/cli-plugin-eslint": "^4.4.6",
     "@vue/cli-plugin-typescript": "^4.4.6",
     "@vue/cli-service": "^4.4.6",
+    "babel-jest": "^26.2.2",
     "eslint": "^7.5.0",
     "eslint-plugin-jsdoc": "^30.0.3",
     "eslint-plugin-vue": "^6.1.2",
     "jest": "^26.2.2",
-    "ts-jest": "^26.1.4",
     "typescript": "^3.9.7",
     "vue-template-compiler": "^2.6.11"
   }