Initial configuration

.eslintignore

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+# don't ever lint node_modules
+node_modules
+# don't lint nyc coverage output
+coverage
+
+# ignore generated files
+**/*.js
+**/*.d.ts
+**/*.js.map

.eslintrc.js

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+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    tsconfigRootDir: __dirname, // this is the reason this is a .js file
+    project: ['./tsconfig.json'],
+  },
+  plugins: [
+    '@typescript-eslint',
+    'prettier',
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:@typescript-eslint/recommended-requiring-type-checking',
+    'prettier', // disables rules from the above that conflict with prettier
+    'plugin:prettier/recommended', // adds prettier rules
+  ],
+  rules: {
+    '@typescript-eslint/no-empty-interface': 'off',
+    'prettier/prettier': 'error',
+  },
+};

.gitignore

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+.idea
+node_modules
+coverage
+
+*.js
+*.js.map
+*.d.ts
+
+!.eslintrc.js
+!jest.config.js

.prettierrc

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+{
+  "printWidth": 120,
+  "singleQuote": true,
+  "trailingComma": "all"
+}

.travis.yml

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+language: node_js
+node_js:
+ - "10"
+ - "12"
+ - "14"
+ - "node"
+script:
+ - npm run build
+ - npm run lint
+ - npm run test
+cache: npm

jest.config.js

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+module.exports = {
+  "globals": {
+    "ts-jest": {
+      "tsConfig": "tsconfig.json"
+    }
+  },
+  "transform": {
+    "^.+\\.ts$": "ts-jest"
+  },
+  "testRegex": "/test/.*\\.ts$",
+  "moduleFileExtensions": [
+    "ts",
+    "js"
+  ],
+  "testEnvironment": "node",
+  "collectCoverage": true,
+  // either we don't build the test files (but then eslint needs a separate tsconfig) or we do this
+  "testPathIgnorePatterns": [
+    ".*\\.d\\.ts"
+  ],
+  "coveragePathIgnorePatterns": [
+    "/node_modules/"
+  ]
+};