Initial implementation, tests, readme

.editorconfig

@@ -0,0 +1,20 @@
+root = true
+
+[*]
+indent_style = tab
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+max_line_length = 150
+
+[CHANGELOG.md]
+indent_style = space
+indent_size = 2
+
+[*.json]
+max_line_length = off
+
+[Makefile]
+max_line_length = off

.eslintrc

@@ -0,0 +1,17 @@
+{
+	"root": true,
+
+	"extends": "@ljharb",
+
+	"globals": {
+		"DataView": false
+	},
+
+	"rules": {
+		"new-cap": ["error", {
+			"capIsNewExceptions": [
+				"GetIntrinsic",
+			],
+		}],
+	},
+}

.github/FUNDING.yml

@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: [ljharb]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: npm/is-typed-array
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/workflows/node-aught.yml

@@ -0,0 +1,18 @@
+name: 'Tests: node.js < 10'
+
+on: [pull_request, push]
+
+jobs:
+  tests:
+    uses: ljharb/actions/.github/workflows/node.yml@main
+    with:
+      range: '< 10'
+      type: minors
+      command: npm run tests-only
+
+  node:
+    name: 'node < 10'
+    needs: [tests]
+    runs-on: ubuntu-latest
+    steps:
+      - run: 'echo tests completed'

.github/workflows/node-harmony.yml

@@ -0,0 +1,19 @@
+name: 'Tests: node.js (harmony)'
+
+on: [pull_request, push]
+
+jobs:
+  tests:
+    uses: ljharb/actions/.github/workflows/node.yml@main
+    with:
+      range: '>=0.4 <16'
+      type: minors
+      command: npm run test:harmony
+      skip-ls-check: true
+
+  node:
+    name: 'node: harmony'
+    needs: [tests]
+    runs-on: ubuntu-latest
+    steps:
+      - run: 'echo tests completed'

.github/workflows/node-pretest.yml

@@ -0,0 +1,7 @@
+name: 'Tests: pretest/posttest'
+
+on: [pull_request, push]
+
+jobs:
+  tests:
+    uses: ljharb/actions/.github/workflows/pretest.yml@main

.github/workflows/node-tens.yml

@@ -0,0 +1,18 @@
+name: 'Tests: node.js >= 10'
+
+on: [pull_request, push]
+
+jobs:
+  tests:
+    uses: ljharb/actions/.github/workflows/node.yml@main
+    with:
+      range: '>= 10'
+      type: minors
+      command: npm run tests-only
+
+  node:
+    name: 'node >= 10'
+    needs: [tests]
+    runs-on: ubuntu-latest
+    steps:
+      - run: 'echo tests completed'

.github/workflows/rebase.yml

@@ -0,0 +1,9 @@
+name: Automatic Rebase
+
+on: [pull_request_target]
+
+jobs:
+  _:
+    uses: ljharb/actions/.github/workflows/rebase.yml@main
+    secrets:
+      token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/require-allow-edits.yml

@@ -0,0 +1,12 @@
+name: Require “Allow Edits”
+
+on: [pull_request_target]
+
+jobs:
+  _:
+    name: "Require “Allow Edits”"
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: ljharb/require-allow-edits@main

.gitignore

@@ -133,3 +133,5 @@ dist
 npm-shrinkwrap.json
 package-lock.json
 yarn.lock
+
+.npmignore

.npmrc

@@ -1 +1,3 @@
 package-lock=false
+allow-same-version=true
+message=v%s

.nycrc

@@ -0,0 +1,9 @@
+{
+	"all": true,
+	"check-coverage": false,
+	"reporter": ["text-summary", "text", "html", "json"],
+	"exclude": [
+		"coverage",
+		"test"
+	]
+}

CHANGELOG.md

@@ -0,0 +1,6 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

README.md

@@ -1,2 +1,69 @@
-# is-data-view
-Is this value a JS DataView? This module works cross-realm/iframe, does not depend on instanceof or mutable properties, and despite ES6 Symbol.toStringTag.
+# is-data-view <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
+
+[![github actions][actions-image]][actions-url]
+[![coverage][codecov-image]][codecov-url]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+[![npm badge][npm-badge-png]][package-url]
+
+Is this value a JS DataView? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.
+
+## Example
+
+```js
+var isDataView = require('is-data-view');
+var assert = require('assert');
+
+assert.equal(false, isDataView(undefined));
+assert.equal(false, isDataView(null));
+assert.equal(false, isDataView(false));
+assert.equal(false, isDataView(true));
+assert.equal(false, isDataView([]));
+assert.equal(false, isDataView({}));
+assert.equal(false, isDataView(/a/g));
+assert.equal(false, isDataView(new RegExp('a', 'g')));
+assert.equal(false, isDataView(new Date()));
+assert.equal(false, isDataView(42));
+assert.equal(false, isDataView(NaN));
+assert.equal(false, isDataView(Infinity));
+assert.equal(false, isDataView(new Number(42)));
+assert.equal(false, isDataView('foo'));
+assert.equal(false, isDataView(Object('foo')));
+assert.equal(false, isDataView(function () {}));
+assert.equal(false, isDataView(function* () {}));
+assert.equal(false, isDataView(x => x * x));
+assert.equal(false, isDataView([]));
+assert.equal(false, isDataView(new Int8Array()));
+assert.equal(false, isDataView(new Uint8Array()));
+assert.equal(false, isDataView(new Uint8ClampedArray()));
+assert.equal(false, isDataView(new Int16Array()));
+assert.equal(false, isDataView(new Uint16Array()));
+assert.equal(false, isDataView(new Int32Array()));
+assert.equal(false, isDataView(new Uint32Array()));
+assert.equal(false, isDataView(new Float32Array()));
+assert.equal(false, isDataView(new Float64Array()));
+assert.equal(false, isDataView(new BigInt64Array()));
+assert.equal(false, isDataView(new BigUint64Array()));
+
+assert.ok(isDataView(new DataView(new ArrayBuffer(0))));
+```
+
+## Tests
+Simply clone the repo, `npm install`, and run `npm test`
+
+[package-url]: https://npmjs.org/package/is-data-view
+[npm-version-svg]: https://versionbadg.es/inspect-js/is-data-view.svg
+[deps-svg]: https://david-dm.org/inspect-js/is-data-view.svg
+[deps-url]: https://david-dm.org/inspect-js/is-data-view
+[dev-deps-svg]: https://david-dm.org/inspect-js/is-data-view/dev-status.svg
+[dev-deps-url]: https://david-dm.org/inspect-js/is-data-view#info=devDependencies
+[npm-badge-png]: https://nodei.co/npm/is-data-view.png?downloads=true&stars=true
+[license-image]: https://img.shields.io/npm/l/is-data-view.svg
+[license-url]: LICENSE
+[downloads-image]: https://img.shields.io/npm/dm/is-data-view.svg
+[downloads-url]: https://npm-stat.com/charts.html?package=is-data-view
+[codecov-image]: https://codecov.io/gh/inspect-js/is-data-view/branch/main/graphs/badge.svg
+[codecov-url]: https://app.codecov.io/gh/inspect-js/is-data-view/
+[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/is-data-view
+[actions-url]: https://github.com/inspect-js/is-data-view/actions

index.js

@@ -0,0 +1,45 @@
+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+
+var $ArrayBuffer = GetIntrinsic('%ArrayBuffer%');
+var $DataView = GetIntrinsic('%DataView%', true);
+
+var callBound = require('call-bind/callBound');
+
+var $dataViewBuffer = callBound('DataView.prototype.buffer', true);
+
+var isTypedArray = require('is-typed-array');
+
+// node <= 0.10, < 0.11.4 has a nonconfigurable own property instead of a prototype getter
+module.exports = function isDataView(x) {
+	if (!x || typeof x !== 'object' || !$DataView || isTypedArray(x)) {
+		return false;
+	}
+
+	if ($dataViewBuffer) {
+		try {
+			$dataViewBuffer(x);
+			return true;
+		} catch (e) {
+			return false;
+		}
+	}
+
+	/*
+	 * try {
+	 * new $DataView(x); // eslint-disable-line no-new
+	 * x is an ArrayBuffer
+	 * } catch (e) {
+	 */
+	if (
+		('getInt8' in x)
+			&& typeof x.getInt8 === 'function'
+			&& x.getInt8 === new $DataView(new $ArrayBuffer(1)).getInt8
+	) {
+		return true;
+	}
+	// }
+
+	return false;
+};

package.json

@@ -1,14 +1,27 @@
 {
 	"name": "is-data-view",
 	"version": "0.0.0",
-	"description": "Is this value a JS DataView? This module works cross-realm/iframe, does not depend on instanceof or mutable properties, and despite ES6 Symbol.toStringTag.",
+	"description": "Is this value a JS DataView? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.",
 	"main": "index.js",
 	"exports": {
 		".": "./index.js",
 		"./package.json": "./package.json"
 	},
 	"scripts": {
-		"test": "echo \"Error: no test specified\" && exit 1"
+		"prepack": "npmignore --auto --commentLines=autogenerated",
+		"prepublishOnly": "safe-publish-latest",
+		"prepublish": "not-in-publish || npm run prepublishOnly",
+		"prelint": "evalmd README.md",
+		"lint": "eslint --ext=js,mjs .",
+		"pretest": "npm run lint",
+		"tests-only": "nyc tape 'test/**/*.js'",
+		"test": "npm run tests-only",
+		"posttest": "aud --production",
+		"version": "auto-changelog && git add CHANGELOG.md",
+		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""
+	},
+	"funding": {
+		"url": "https://github.com/sponsors/ljharb"
 	},
 	"repository": {
 		"type": "git",
@@ -28,5 +41,46 @@
 	"bugs": {
 		"url": "https://github.com/inspect-js/is-data-view/issues"
 	},
-	"homepage": "https://github.com/inspect-js/is-data-view#readme"
+	"homepage": "https://github.com/inspect-js/is-data-view#readme",
+	"dependencies": {
+		"is-typed-array": "^1.1.12"
+	},
+	"devDependencies": {
+		"@ljharb/eslint-config": "^21.1.0",
+		"aud": "^2.0.3",
+		"auto-changelog": "^2.4.0",
+		"available-typed-arrays": "^1.0.5",
+		"es-value-fixtures": "^1.4.2",
+		"eslint": "=8.8.0",
+		"evalmd": "^0.0.19",
+		"for-each": "^0.3.3",
+		"has-tostringtag": "^1.0.0",
+		"in-publish": "^2.0.1",
+		"make-arrow-function": "^1.2.0",
+		"make-generator-function": "^2.0.0",
+		"npmignore": "^0.3.0",
+		"nyc": "^10.3.2",
+		"object-inspect": "^1.12.3",
+		"safe-publish-latest": "^2.0.0",
+		"tape": "^5.6.5"
+	},
+	"testling": {
+		"files": "test/index.js"
+	},
+	"engines": {
+		"node": ">= 0.4"
+	},
+	"auto-changelog": {
+		"output": "CHANGELOG.md",
+		"template": "keepachangelog",
+		"unreleased": false,
+		"commitLimit": false,
+		"backfillLimit": false,
+		"hideCredit": true
+	},
+	"publishConfig": {
+		"ignore": [
+			".github/workflows"
+		]
+	}
 }