migrate the package to ESM

.github/workflows/run-tests.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x, 18.x, 19.x]
+        node-version: [20.x, 21.x]
 
     name: Node ${{ matrix.node-version }}
 

package.json

@@ -7,17 +7,23 @@
     "url": "https://github.com/supercharge/queue-datastructure/issues"
   },
   "devDependencies": {
-    "@supercharge/eslint-config-typescript": "~2.0.0",
-    "@supercharge/tsconfig": "~3.1.0",
-    "@types/jest": "~27.5.1",
-    "eslint": "~8.15.0",
-    "jest": "~28.1.0",
-    "ts-jest": "~28.0.2",
-    "typescript": "~4.6.4"
+    "@supercharge/eslint-config-typescript": "~4.0.0",
+    "@supercharge/tsconfig": "~7.0.0",
+    "c8": "~8.0.1",
+    "eslint": "~8.53.0",
+    "expect": "~29.7.0",
+    "typescript": "~5.2.2",
+    "uvu": "~0.5.6"
   },
   "files": [
-    "dist/src"
+    "dist"
   ],
+  "main": "dist/index.js",
+  "exports": {
+    ".": "./dist/index.js"
+  },
+  "type": "module",
+  "types": "dist",
   "homepage": "https://github.com/supercharge/queue-datastructure",
   "keywords": [
     "queue",
@@ -27,7 +33,6 @@
     "superchargejs"
   ],
   "license": "MIT",
-  "main": "dist/src",
   "publishConfig": {
     "access": "public"
   },
@@ -41,10 +46,8 @@
     "lint": "eslint src --ext .js,.ts",
     "lint:fix": "eslint src --ext .js,.ts --fix",
     "list:tests": "jest --listTests",
-    "test": "npm run build && npm run lint && npm run test:run",
-    "test:run": "jest --config=jest.config.js",
-    "test:single": "lab --transform node_modules/lab-transform-typescript --assert @hapi/code --leaks --lint --id",
-    "test:types": "tsc"
-  },
-  "types": "dist/src"
+    "test": "npm run build && npm run lint && npm run test:run ",
+    "test:run": "c8 --include=dist uvu --ignore helpers",
+    "posttest": "c8 report --reporter=html"
+  }
 }

src/index.ts

@@ -1,3 +1,3 @@
 'use strict'
 
-export * from './queue'
+export { Queue } from './queue.js'

src/iterator.ts

@@ -1,4 +1,3 @@
-'use strict'
 
 export class QueueIterator<T> implements IterableIterator<T> {
   /**
@@ -37,7 +36,7 @@ export class QueueIterator<T> implements IterableIterator<T> {
    */
   next (): IteratorResult<T> {
     return this.pointer < this.items.length
-      ? { done: false, value: this.items[this.pointer++] }
+      ? { done: false, value: this.items[this.pointer++] as T }
       : { done: true, value: undefined }
   }
 }

src/queue.ts

@@ -1,6 +1,5 @@
-'use strict'
 
-import { QueueIterator } from './iterator'
+import { QueueIterator } from './iterator.js'
 
 export class Queue<T> implements Iterable<T> {
   /**

test/queue.js

@@ -0,0 +1,142 @@
+
+import { test } from 'uvu'
+import { expect } from 'expect'
+import { Queue } from '../dist/index.js'
+
+test('creates an empty new Queue', () => {
+  const queue = new Queue()
+
+  expect(queue.size()).toEqual(0)
+  expect(queue.peek()).toBeUndefined()
+})
+
+test('creates a new Queue() from an array', () => {
+  const queue = new Queue([1, 2])
+
+  expect(queue.size()).toEqual(2)
+  expect(queue.dequeue()).toEqual(1)
+})
+
+test('enqueue', () => {
+  const queue = new Queue(1, 2)
+  queue.enqueue(3)
+  expect(queue.size()).toEqual(3)
+
+  queue.enqueue(4, 5)
+  expect(queue.size()).toEqual(5)
+  expect(queue.peek()).toEqual(1)
+
+  queue.enqueue(...[6, 7])
+  expect(queue.size()).toEqual(7)
+})
+
+test('dequeue', () => {
+  const queue = new Queue(1)
+  expect(queue.dequeue()).toEqual(1)
+  expect(queue.size()).toEqual(0)
+  expect(queue.dequeue()).toBeUndefined()
+})
+
+test('peek', () => {
+  const queue = new Queue(1, 2, 3)
+  const item = queue.peek()
+  expect(item).toEqual(1)
+  expect(queue.size()).toEqual(3)
+})
+
+test('size', () => {
+  expect(
+    new Queue(1, 2).size()
+  ).toEqual(2)
+})
+
+test('items', () => {
+  expect(
+    new Queue(1, 2, 3).items()
+  ).toEqual([1, 2, 3])
+
+  expect(
+    new Queue([1, 2, 3]).items()
+  ).toEqual([1, 2, 3])
+
+  expect(
+    new Queue()
+      .enqueue(1, 2)
+      .enqueue(3)
+      .enqueue(...[4, 5, 6])
+      .items()
+  ).toEqual([1, 2, 3, 4, 5, 6])
+})
+
+test('isEmpty', () => {
+  const queue = new Queue(1)
+  expect(queue.isEmpty()).toBe(false)
+
+  queue.dequeue()
+  expect(queue.isEmpty()).toBe(true)
+})
+
+test('isNotEmpty', () => {
+  const queue = new Queue(1)
+  expect(queue.isNotEmpty()).toBe(true)
+  expect(queue.isEmpty()).toBe(false)
+
+  queue.dequeue()
+  expect(queue.isNotEmpty()).toBe(false)
+  expect(queue.isEmpty()).toBe(true)
+})
+
+test('clear', () => {
+  const queue = new Queue(1)
+  expect(queue.isEmpty()).toBe(false)
+
+  queue.clear()
+  expect(queue.isEmpty()).toBe(true)
+})
+
+test('for..of', () => {
+  const queue = new Queue(1, 2, 3)
+  const items = []
+
+  for (const item of queue) {
+    items.push(item)
+  }
+
+  expect(items).toEqual([1, 2, 3])
+})
+
+test('Symbol.iterator', () => {
+  const queue = new Queue(1, 2, 3)
+
+  const iterable = queue[Symbol.iterator]()
+  expect(iterable.next).toBeInstanceOf(Function)
+
+  const items = []
+
+  for (const item of iterable) {
+    items.push(item)
+  }
+
+  expect(items).toEqual([1, 2, 3])
+})
+
+test('Symbol.iterator is iterable', () => {
+  const queue = new Queue(1, 2, 3)
+
+  const iterable = queue[Symbol.iterator]()
+  expect(iterable.next).toBeInstanceOf(Function)
+
+  const items = []
+
+  items.push(iterable.next().value)
+  expect(items).toEqual([1])
+
+  // Continue with same iterable
+  for (const item of iterable) {
+    items.push(item)
+  }
+
+  expect(items).toEqual([1, 2, 3])
+})
+
+test.run()

tsconfig.json

@@ -2,15 +2,13 @@
   "extends": "@supercharge/tsconfig",
   "compilerOptions": {
     "outDir": "./dist",
-    "lib": [
-      "es2017"
-    ]
   },
   "include": [
     "./**/*"
   ],
   "exclude": [
     "./node_modules",
-    "./dist"
+    "./dist",
+    "./test",
   ]
 }