Add array findlast and findlastindex

package.json

@@ -1,52 +1,53 @@
 {
-  "name": "@github/browser-support",
-  "version": "1.2.2",
-  "description": "Polyfills and Capable Browser detection",
-  "homepage": "https://github.github.io/browser-support",
-  "bugs": {
-    "url": "https://github.com/github/browser-support/issues"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/github/browser-support.git"
-  },
-  "license": "MIT",
-  "author": "GitHub Inc.",
-  "contributors": [
-    "Keith Cirkel (https://keithcirkel.co.uk/)",
-    "Kristján Oddsson <[email protected]>"
-  ],
-  "type": "module",
-  "main": "lib/index.js",
-  "module": "lib/index.js",
-  "files": [
-    "lib"
-  ],
-  "scripts": {
-    "build": "tsc --build",
-    "lint": "eslint . --ignore-path .gitignore",
-    "pretest": "npm run build",
-    "test": "npm run lint && karma start test/karma.config.cjs",
-    "prepack": "npm run build",
-    "postpublish": "npm publish --ignore-scripts --@github:registry='https://npm.pkg.github.com'"
-  },
-  "prettier": "@github/prettier-config",
-  "devDependencies": {
-    "@github/prettier-config": "^0.0.4",
-    "@typescript-eslint/eslint-plugin": "^5.11.0",
-    "@typescript-eslint/parser": "^5.11.0",
-    "chai": "^4.3.0",
-    "chromium": "^3.0.3",
-    "eslint": "^8.8.0",
-    "eslint-plugin-github": "^4.1.1",
-    "karma": "^6.1.1",
-    "karma-chai": "^0.1.0",
-    "karma-chai-spies": "^0.1.4",
-    "karma-chrome-launcher": "^3.1.0",
-    "karma-mocha": "^2.0.1",
-    "karma-mocha-reporter": "^2.2.5",
-    "mocha": "^9.2.0",
-    "tslib": "^2.1.0",
-    "typescript": "^4.7.4"
-  }
+    "name": "@github/browser-support",
+    "version": "1.2.2",
+    "description": "Polyfills and Capable Browser detection",
+    "homepage": "https://github.github.io/browser-support",
+    "bugs": {
+        "url": "https://github.com/github/browser-support/issues"
+    },
+    "repository": {
+        "type": "git",
+        "url": "git+https://github.com/github/browser-support.git"
+    },
+    "license": "MIT",
+    "author": "GitHub Inc.",
+    "contributors": [
+        "Keith Cirkel (https://keithcirkel.co.uk/)",
+        "Kristj\u00e1n Oddsson <[email protected]>"
+    ],
+    "type": "module",
+    "main": "lib/index.js",
+    "module": "lib/index.js",
+    "files": [
+        "lib"
+    ],
+    "scripts": {
+        "build": "tsc --build",
+        "lint": "eslint . --ignore-path .gitignore",
+        "pretest": "npm run build",
+        "test": "npm run lint && karma start test/karma.config.cjs",
+        "prepack": "npm run build",
+        "postpublish": "npm publish --ignore-scripts --@github:registry='https://npm.pkg.github.com'"
+    },
+    "prettier": "@github/prettier-config",
+    "devDependencies": {
+        "@github/prettier-config": "^0.0.4",
+        "@types/node": "^20.3.1",
+        "@typescript-eslint/eslint-plugin": "^5.11.0",
+        "@typescript-eslint/parser": "^5.11.0",
+        "chai": "^4.3.0",
+        "chromium": "^3.0.3",
+        "eslint": "^8.8.0",
+        "eslint-plugin-github": "^4.1.1",
+        "karma": "^6.1.1",
+        "karma-chai": "^0.1.0",
+        "karma-chai-spies": "^0.1.4",
+        "karma-chrome-launcher": "^3.1.0",
+        "karma-mocha": "^2.0.1",
+        "karma-mocha-reporter": "^2.2.5",
+        "mocha": "^9.2.0",
+        "tslib": "^2.1.0",
+        "typescript": "^5.1.3"
+    }
 }

src/abortsignal-abort.ts

@@ -12,22 +12,16 @@ declare global {
 
 /*#__PURE__*/
 export function isSupported(): boolean {
-  return (
-    'abort' in AbortSignal &&
-    // @ts-expect-error `.abort`
-    typeof AbortSignal.abort === 'function'
-  )
+  return 'abort' in AbortSignal && typeof AbortSignal.abort === 'function'
 }
 
 /*#__PURE__*/
 export function isPolyfilled(): boolean {
-  // @ts-expect-error `.abort`
   return AbortSignal.abort === abortSignalAbort
 }
 
 export function apply(): void {
   if (!isSupported()) {
-    // @ts-expect-error `.abort`
     AbortSignal.abort = abortSignalAbort
   }
 }

src/abortsignal-timeout.ts

@@ -12,22 +12,16 @@ declare global {
 
 /*#__PURE__*/
 export function isSupported(): boolean {
-  return (
-    'abort' in AbortSignal &&
-    // @ts-expect-error `.timeout`
-    typeof AbortSignal.timeout === 'function'
-  )
+  return 'abort' in AbortSignal && typeof AbortSignal.timeout === 'function'
 }
 
 /*#__PURE__*/
 export function isPolyfilled(): boolean {
-  // @ts-expect-error `.timeout`
   return AbortSignal.timeout === abortSignalTimeout
 }
 
 export function apply(): void {
   if (!isSupported()) {
-    // @ts-expect-error `.timeout`
     AbortSignal.timeout = abortSignalTimeout
   }
 }

src/array-findlast.ts

@@ -0,0 +1,26 @@
+export function arrayFindLast<T>(
+  this: T[],
+  pred: (this: T[], value: T, i: number, array: T[]) => boolean,
+  recv = this
+): T | void {
+  for (let i = this.length; i > 0; i -= 1) {
+    if (pred.call(recv, this[i], i, this)) return this[i]
+  }
+}
+
+/*#__PURE__*/
+export function isSupported(): boolean {
+  return 'findLast' in Array.prototype && typeof Array.prototype.findLast === 'function'
+}
+
+/*#__PURE__*/
+export function isPolyfilled(): boolean {
+  return Array.prototype.findLast === arrayFindLast
+}
+
+export function apply(): void {
+  if (!isSupported()) {
+    const defn = {value: arrayFindLast, writable: true, configurable: true}
+    Object.defineProperty(Array.prototype, 'findLast', defn)
+  }
+}

src/array-findlastindex.ts

@@ -0,0 +1,31 @@
+export function arrayFindLastIndex<T>(
+  this: T[],
+  pred: (this: T[], value: T, i: number, array: T[]) => boolean,
+  recv = this
+): number {
+  for (let i = this.length; i > 0; i -= 1) {
+    if (pred.call(recv, this[i], i, this)) return i
+  }
+  return -1
+}
+
+/*#__PURE__*/
+export function isSupported(): boolean {
+  return 'findLastIndex' in Array.prototype && typeof Array.prototype.findLastIndex === 'function'
+}
+
+/*#__PURE__*/
+export function isPolyfilled(): boolean {
+  return Array.prototype.findLastIndex === arrayFindLastIndex
+}
+
+export function apply(): void {
+  if (!isSupported()) {
+    const defn = {
+      value: arrayFindLastIndex,
+      writable: true,
+      configurable: true
+    }
+    Object.defineProperty(Array.prototype, 'findLastIndex', defn)
+  }
+}

src/crypto-randomuuid.ts

@@ -1,4 +1,4 @@
-export function randomUUID() {
+export function randomUUID(): `${string}-${string}-${string}-${string}-${string}` {
   const buf = new Uint32Array(4)
   crypto.getRandomValues(buf)
   let idx = -1
@@ -7,7 +7,7 @@ export function randomUUID() {
     const r = (buf[idx >> 3] >> ((idx % 8) * 4)) & 15
     const v = c === 'x' ? r : (r & 0x3) | 0x8
     return v.toString(16)
-  })
+  }) as `${string}-${string}-${string}-${string}-${string}`
 }
 
 declare global {

test/array-findlast.js

@@ -0,0 +1,29 @@
+import {apply, arrayFindLast, isPolyfilled, isSupported} from '../lib/array-findlast.js'
+
+describe('arrayFindLast', () => {
+  it('has standard isSupported, isPolyfilled, apply API', () => {
+    expect(isSupported).to.be.a('function')
+    expect(isPolyfilled).to.be.a('function')
+    expect(apply).to.be.a('function')
+    expect(isSupported()).to.be.a('boolean')
+    expect(isPolyfilled()).to.equal(false)
+  })
+
+  it('returns value that passes truthy', () => {
+    expect(arrayFindLast.call([1, 2, 3], v => v === 3)).to.equal(3)
+    const arr = [1, 2, 3]
+    const recv = {}
+    expect(
+      arrayFindLast.call(
+        arr,
+        function (v, i, _arr) {
+          // eslint-disable-next-line @typescript-eslint/no-invalid-this
+          expect(this).to.equal(recv)
+          expect(_arr).to.equal(arr)
+          expect(v).to.equal(arr[i])
+        },
+        recv
+      )
+    )
+  })
+})

test/array-findlastindex.js

@@ -0,0 +1,29 @@
+import {apply, arrayFindLastIndex, isPolyfilled, isSupported} from '../lib/array-findlastindex.js'
+
+describe('arrayFindLastIndex', () => {
+  it('has standard isSupported, isPolyfilled, apply API', () => {
+    expect(isSupported).to.be.a('function')
+    expect(isPolyfilled).to.be.a('function')
+    expect(apply).to.be.a('function')
+    expect(isSupported()).to.be.a('boolean')
+    expect(isPolyfilled()).to.equal(false)
+  })
+
+  it('returns value that passes truthy', () => {
+    expect(arrayFindLastIndex.call([1, 2, 3], v => v === 3)).to.equal(2)
+    const arr = [1, 2, 3]
+    const recv = {}
+    expect(
+      arrayFindLastIndex.call(
+        arr,
+        function (v, i, _arr) {
+          // eslint-disable-next-line @typescript-eslint/no-invalid-this
+          expect(this).to.equal(recv)
+          expect(_arr).to.equal(arr)
+          expect(v).to.equal(arr[i])
+        },
+        recv
+      )
+    )
+  })
+})

tsconfig.json

@@ -1,18 +1,18 @@
 {
-    "include": ["src"],
-    "compilerOptions": {
-      "baseUrl": ".",
-      "declaration": true,
-      "declarationMap": true,
-      "esModuleInterop": true,
-      "experimentalDecorators": true,
-      "lib": ["es2021", "dom"],
-      "module": "ESNext",
-      "moduleResolution": "node",
-      "noEmit": false,
-      "outDir": "./lib",
-      "sourceMap": true,
-      "strict": true,
-      "target": "ES2020"
-    }
+  "include": ["src"],
+  "compilerOptions": {
+    "baseUrl": ".",
+    "declaration": true,
+    "declarationMap": true,
+    "esModuleInterop": true,
+    "experimentalDecorators": true,
+    "lib": ["es2023", "dom"],
+    "module": "ESNext",
+    "moduleResolution": "node",
+    "noEmit": false,
+    "outDir": "./lib",
+    "sourceMap": true,
+    "strict": true,
+    "target": "ES2020"
   }
+}