Added typings for CodeFlask (#39913)

* Added typings for CodeFlask

* Updated to match with Prismjs

types/codeflask/codeflask-tests.ts

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+import CodeFlask from 'codeflask';
+
+const flask = new CodeFlask(new HTMLElement(), {
+  language: 'js',
+  defaultTheme: false
+});
+
+flask.onUpdate((code) => { });
+
+flask.updateCode('Test');
+
+const code: string = flask.getCode();

types/codeflask/index.d.ts

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+// Type definitions for codeflask 1.4
+// Project: https://kazzkiq.github.io/CodeFlask/
+// Definitions by: Joachim Holwech <https://github.com/holwech>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+import { Languages } from 'prismjs';
+
+export default class CodeFlask {
+    constructor(selectorOrElement: string | HTMLElement, opts: options);
+    onUpdate(callback: (code: string) => void): void;
+    updateCode(newCode: string): void;
+    getCode(): string;
+    addLanguage(name: string, options: Languages): void;
+}
+
+export interface options {
+    language?: string;
+    rtl?: boolean;
+    tabSize?: number;
+    enableAutocorrect?: boolean;
+    lineNumbers?: boolean;
+    defaultTheme?: boolean;
+    areaId?: string;
+    ariaLabelledby?: string;
+    readonly?: boolean;
+    handleTabs?: boolean;
+    handleSelfClosingCharacters?: boolean;
+    handleNewLineIndentation?: boolean;
+}

types/codeflask/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es5",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "codeflask-tests.ts"
+    ]
+}

types/codeflask/tslint.json

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