FizzBuzz with TypeScript

typescript/Dockerfile

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+FROM node:16-alpine
+
+CMD ["sh"]
+
+ENV PATH=${PATH}:/app/node_modules/.bin
+
+RUN apk add --no-cache entr just
+
+WORKDIR /app
+
+USER node
+

typescript/fizzbuzz/.gitignore

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+/*.js
+/node_modules/

typescript/fizzbuzz/FizzBuzz.test.ts

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+let FizzBuzz = require("./FizzBuzz");
+
+it.each([
+  [1, "1"],
+  [2, "2"],
+  [4, "4"],
+  [7, "7"],
+  [8, "8"],
+])("should return %s as '%s'", (input: number, expected: string) => {
+  expect(FizzBuzz(input)).toBe(expected);
+});
+
+it.each([3, 6, 9])("should return %s as 'Fizz'", (input: number) => {
+  expect(FizzBuzz(input)).toBe("Fizz");
+});
+
+it.each([5, 10, 20])("should return %s as 'Buzz'", (input: number) => {
+  expect(FizzBuzz(input)).toBe("Buzz");
+});
+
+it.each([15, 30, 45])("should return %s as 'FizzBuzz'", (input: number) => {
+  expect(FizzBuzz(input)).toBe("FizzBuzz");
+});

typescript/fizzbuzz/FizzBuzz.ts

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+module.exports = (input: number): string => {
+  if (input % 3 == 0 && input % 5 == 0) {
+    return "FizzBuzz";
+  }
+
+  if (input % 3 == 0) {
+    return "Fizz";
+  }
+
+  if (input % 5 == 0) {
+    return "Buzz";
+  }
+
+  return input.toString();
+};

typescript/fizzbuzz/justfile

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+default:
+  just --list
+
+clean:
+  rm *.js -f
+
+compile: clean
+  tsc *.ts
+
+test: compile
+  jest *.test.js
+
+test-watch:
+  ls *.ts | entr -r just test

typescript/fizzbuzz/package.json

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+{
+  "devDependencies": {
+    "@types/jest": "^29.0.3",
+    "jest": "^29.0.3",
+    "prettier": "^2.7.1"
+  },
+  "dependencies": {
+    "tsc": "^2.0.4",
+    "typescript": "^4.8.3"
+  }
+}