setup rollup, prettier, eslint

.eslintrc.js

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+module.exports = {
+  plugins: [
+    'import',
+    'unused-imports',
+    '@typescript-eslint'
+  ],
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    'ecmaVersion': 2017,
+    'sourceType': 'module',
+    'project': './tsconfig.json'
+  },
+  rules: {
+    'curly': ['error', 'all'],
+    'no-extra-label': 'error',
+    'no-unused-labels': 'error',
+    'new-parens': 'error',
+    'no-new-wrappers': 'error',
+    'no-debugger': 'error',
+    'no-duplicate-case': 'error',
+    'no-throw-literal': 'error',
+    'no-return-await': 'error',
+    'no-unsafe-finally': 'error',
+    'no-unused-expressions': [
+      'error',
+      {
+        'allowShortCircuit': true
+      }
+    ],
+    'no-var': 'error',
+    'object-shorthand': 'error',
+    'prefer-arrow-callback': [
+      'error',
+      {
+        'allowNamedFunctions': true
+      }
+    ],
+    'prefer-const': [
+      'error',
+      {
+        'destructuring': 'all'
+      }
+    ],
+    'no-array-constructor': 'error',
+    'import/no-default-export': 'error',
+    'import/no-duplicates': 'error',
+    'unused-imports/no-unused-imports-ts': 'error',
+    'default-case': 'error',
+    '@typescript-eslint/no-floating-promises': 'error'
+  }
+};

.gitignore

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+# Mac OS
+.DS_Store
+
+# Yarn
+node_modules
+yarn-error.log
+yarn-debug.log
+
+dist

.prettierrc.json

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+{
+  "singleQuote": true,
+  "printWidth": 80,
+  "trailingComma": "none",
+  "arrowParens": "avoid"
+}

package.json

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+{
+  "name": "exploring-pioneer",
+  "version": "1.0.0",
+  "description": "",
+  "author": "",
+  "license": "MIT",
+  "scripts": {
+    "prebuild": "tsc --emitDeclarationOnly --declaration -p tsconfig.json",
+    "build": "rollup -c",
+    "clean": "rm -rf dist",
+    "lint": "eslint -c .eslintrc.js '**/*.ts' --ignore-path '.gitignore'",
+    "prettier": "prettier --write",
+    "test": "test"
+  },
+  "main": "dist/index.cjs.js",
+  "module": "dist/index.esm.js",
+  "exports": {
+    "node": {
+      "require": "./dist/index.cjs.js",
+      "import": "./dist/index.esm.js"
+    },
+    "default": "./dist/index.esm.js"
+  },
+  "types": "./dist/types/index.d.ts",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/alchemyplatform/exploring-pioneer.git"
+  },
+  "files": [
+    "dist"
+  ],
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
+  },
+  "lint-staged": {
+    "**/*.ts": [
+      "yarn lint",
+      "yarn prettier",
+      "git add"
+    ]
+  },
+  "bugs": {
+    "url": "https://github.com/alchemyplatform/exploring-pioneer/issues"
+  },
+  "homepage": "https://github.com/alchemyplatform/exploring-pioneer#readme",
+  "dependencies": {
+    "axios": "^0.26.1",
+    "ethers": "^5.6.1",
+    "tslib": "^2.3.1"
+  },
+  "devDependencies": {
+    "@typescript-eslint/eslint-plugin": "^5.16.0",
+    "@typescript-eslint/parser": "^5.16.0",
+    "eslint": "^8.11.0",
+    "eslint-plugin-import": "^2.25.4",
+    "eslint-plugin-unused-imports": "^2.0.0",
+    "husky": "^7.0.4",
+    "lint-staged": "^12.3.7",
+    "prettier": "2.6.0",
+    "rollup": "^2.70.1",
+    "rollup-plugin-terser": "^7.0.2",
+    "rollup-plugin-typescript2": "^0.31.2",
+    "typescript": "^4.6.2"
+  }
+}

rollup.config.js

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+import pkg from './package.json';
+import typescriptPlugin from 'rollup-plugin-typescript2';
+import { terser } from 'rollup-plugin-terser';
+
+const allBuilds = {
+  input: 'src/index.ts',
+  output: [
+    {
+      file: pkg.main,
+      format: 'cjs',
+      sourcemap: true
+    },
+    {
+      file: pkg.module,
+      format: 'esm',
+      sourcemap: true
+    },
+  ],
+  external: [
+    ...Object.keys(pkg.dependencies || {})
+  ],
+  plugins: [
+    typescriptPlugin(),
+    terser()
+  ]
+};
+
+export default allBuilds;

src/index.ts

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+// import { BigNumber, ethers } from 'ethers';
+
+export class Alchemy {
+  // static num(): BigNumber {
+  //   return ethers.BigNumber.from(42);
+  // }
+  static foo(): string {
+    return 'hello';
+  }
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "declaration": true,
+    "outDir": "dist/types",
+    "forceConsistentCasingInFileNames": true,
+    "allowSyntheticDefaultImports": true,
+    "downlevelIteration": true,
+    "importHelpers": true,
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitReturns": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "strict": true,
+    "moduleResolution": "node",
+    "esModuleInterop": true,
+    "sourceMap": true,
+    "target": "es5",
+    "typeRoots": [
+      "node_modules/@types"
+    ]
+  },
+  "include": [
+    "src/**/*"
+  ],
+  "exclude": [
+    "dist/**/*",
+    "test/**/*"
+  ]
+}