Add tests & ESLint support

Author: Overk1lls

.eslintrc.js

@@ -0,0 +1,32 @@
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: 'tsconfig.json',
+    sourceType: 'module',
+  },
+  plugins: ['@typescript-eslint/eslint-plugin'],
+  extends: [
+    'plugin:@typescript-eslint/recommended',
+    'plugin:prettier/recommended',
+  ],
+  root: true,
+  env: {
+    node: true,
+    jest: true,
+  },
+  ignorePatterns: ['.eslintrc.js'],
+  rules: {
+    '@typescript-eslint/interface-name-prefix': 'off',
+    '@typescript-eslint/explicit-function-return-type': 'off',
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+    '@typescript-eslint/no-unused-vars': ['warn', { vars: 'all', args: 'after-used', ignoreRestSiblings: false }],
+    'prettier/prettier': ['error', {
+      singleQuote: true,
+      printWidth: 100,
+      endOfLine: "auto",
+    }],
+    eqeqeq: ['warn', 'always']
+  },
+};

babel.config.js

@@ -0,0 +1,10 @@
+module.exports = {
+  presets: [
+    ['@babel/preset-env', { targets: { node: 'current' } }],
+    '@babel/preset-typescript',
+  ],
+  plugins: [
+    ['@babel/plugin-proposal-decorators', { decoratorsBeforeExport: true }],
+    ['@babel/plugin-proposal-class-properties', { "loose": false }],
+  ],
+};

jest.config.js

@@ -0,0 +1,9 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  transform: {
+    '^.+\\.ts?$': 'ts-jest',
+    '\\.js$': '<rootDir>/node_modules/babel-jest',
+  },
+  transformIgnorePatterns: ['<rootDir>/node_modules/'],
+};