Update configuration

.eslintrc.json

@@ -20,7 +20,7 @@
       "@typescript-eslint/ban-ts-comment": "error",
       "camelcase": "off",
       "@typescript-eslint/consistent-type-assertions": "error",
-      "@typescript-eslint/explicit-function-return-type": ["error", {"allowExpressions": true}],
+      // "@typescript-eslint/explicit-function-return-type": ["error", {"allowExpressions": true}],
       "@typescript-eslint/func-call-spacing": ["error", "never"],
       "@typescript-eslint/no-array-constructor": "error",
       "@typescript-eslint/no-empty-interface": "error",
@@ -42,8 +42,6 @@
       "@typescript-eslint/promise-function-async": "error",
       "@typescript-eslint/require-array-sort-compare": "error",
       "@typescript-eslint/restrict-plus-operands": "error",
-      "semi": "off",
-      "@typescript-eslint/semi": ["error", "never"],
       "@typescript-eslint/type-annotation-spacing": "error",
       "@typescript-eslint/unbound-method": "error"
     },

.prettierrc.yml

@@ -0,0 +1,12 @@
+semi: true
+overrides:
+  - files: '**/*.{ts,js}'
+    options:
+      trailingComma: 'es5'
+      tabWidth: 2
+      semi: true
+      singleQuote: true
+      quoteProps: 'as-needed'
+      bracketSpacing: true
+      bracketSameLine: true
+      arrowParens: 'avoid'

jest.config.ts

@@ -0,0 +1,11 @@
+module.exports = {
+  clearMocks: true,
+  roots: ['<rootDir>/src/', '<rootDir>/test/'],
+  transform: {
+    '^.+\\.tsx?$': 'babel-jest',
+  },
+  testRegex: '(/test/.*|\\.(test|spec))\\.[tj]sx?$',
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node', 'd.ts'],
+  testEnvironment: 'node',
+  verbose: true,
+};