[html] Add types for html (#43956)

types/html/html-tests.ts

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+import { prettyPrint } from 'html';
+
+prettyPrint('<h2><strong>Hello, <a href="http://example.com">World</a>!</strong></h2>'); // $ExpectType string
+prettyPrint('<h2><strong>Hello, <a href="http://example.com">World</a>!</strong></h2>', {}); // $ExpectType string
+prettyPrint('<h2><strong>Hello, <a href="http://example.com">World</a>!</strong></h2>', {
+    brace_style: 'collapse',
+    indent_scripts: 'keep',
+    indent_size: 2,
+    indent_char: ' ',
+    max_char: 5,
+    unformatted: [],
+});

types/html/index.d.ts

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+// Type definitions for html 1.0
+// Project: https://github.com/maxogden/commonjs-html-prettyprinter
+// Definitions by: Florian Keller <https://github.com/ffflorian>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export interface PrintOptions {
+    /**
+     * Put braces on the same line as control statements (`collapse`),
+     * or put braces on own line (Allman / ANSI style, `expand`),
+     * or just put end braces on own line (`end-expand`). Default: `collapse`.
+     */
+    brace_style?: 'collapse' | 'expand' | 'end-expand';
+    /** Default: `normal`. */
+    indent_scripts?: 'keep' | 'separate' | 'normal';
+    /** indentation size. Default: 4. */
+    indent_size?: number;
+    /** character to indent with. Default: " " (space). */
+    indent_char?: string;
+    /** Maximum amount of characters per line. Default: 70. */
+    max_char?: number;
+    /** list of tags, that shouldn't be reformatted. Defaults to inline tags. */
+    unformatted?: string[];
+}
+
+export function prettyPrint(htmlSource: string, options?: PrintOptions): string;

types/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",
+        "html-tests.ts"
+    ]
+}

types/html/tslint.json

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