create new definitions for chai-html (#43688)

types/chai-html/chai-html-tests.ts

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+// tests taken from https://www.npmjs.com/package/chai-html
+
+import { use, expect } from 'chai';
+import * as chaiHtml from 'chai-html';
+
+use(chaiHtml);
+
+expect('<div><img /></div>').html.to.equal('<div><img></div>');
+expect('<h1>Hello World!</h1>').html.to.not.equal('<h1>Hallo Welt!</h1>');
+
+expect('<div><!--Comment--></div>').html.ignoringComments.to.equal('<div></div>');

types/chai-html/index.d.ts

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+// Type definitions for chai-html 1.3
+// Project: https://github.com/i-like-robots/chai-html
+// Definitions by: Alex <https://github.com/adjerbetian>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.0
+
+/// <reference types="chai" />
+
+declare global {
+    namespace Chai {
+        interface Assertion {
+            html: ChaiHtml.HtmlAssertion;
+        }
+    }
+}
+
+declare namespace ChaiHtml {
+    interface HtmlAssertion extends Chai.Assertion {
+        ignoringComments: Chai.Assertion;
+    }
+}
+
+declare const chaiHtml: Chai.ChaiPlugin;
+declare namespace chaiHtml {}
+export = chaiHtml;

types/chai-html/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "chai-html-tests.ts"
+    ]
+}

types/chai-html/tslint.json

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+{ "extends": "dtslint/dt.json" }