ts setup

ts/.gitignore

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+/node_modules/
+/dist/
+/coverage/

ts/jest.config.js

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+/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
+module.exports = {
+  preset: "ts-jest/presets/default",
+  testEnvironment: "node",
+  collectCoverage: true,
+  verbose: true,
+  testPathIgnorePatterns: ["/node_modules/"],
+  roots: ["<rootDir>/tests"],
+  testTimeout: 90000,
+  resolver: "ts-jest-resolver",
+};

ts/package.json

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+{
+  "name": "serum-dev-tools",
+  "version": "1.0.0",
+  "description": "developer tooling suite for building on serum",
+  "main": "./dist/index.js",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "author": "Sayantan Karmakar",
+  "license": "MIT",
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "rm -rf dist/; tsc",
+    "test": "jest"
+  },
+  "devDependencies": {
+    "@types/jest": "^27.4.1",
+    "jest": "^27.5.1",
+    "ts-jest": "^27.1.4",
+    "ts-jest-resolver": "^2.0.0",
+    "typescript": "^4.6.3"
+  }
+}

ts/src/index.ts

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+export const hello_world = (x: number) => {
+  return `hello ${x}`;
+};

ts/tests/dev.spec.ts

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+import { hello_world } from "../src/index";
+describe("Serum Dev Tools", () => {
+  test("sample test", () => {
+    expect(hello_world(2)).toBe("hello 2");
+  });
+});

ts/tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es2015",
+    "declaration": true,
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "include": ["src/**/*"]
+}