Add types for auth-header (#29779)

* Add types for auth-header

* Address Feedback

types/auth-header/auth-header-tests.ts

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+import * as auth from 'auth-header';
+
+const basic: string = auth.format('Basic');
+const basic2: string = auth.format({scheme: 'Basic'});
+
+const parsed: {scheme: string, token: null | string | string[]} = auth.parse('');

types/auth-header/index.d.ts

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+// Type definitions for auth-header 1.0
+// Project: https://github.com/izaakschroeder/auth-header
+// Definitions by: ForbesLindesay <https://github.com/ForbesLindesay>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
+
+type Params =
+    | Array<[string, string | ReadonlyArray<string>]>
+    | {[key: string]: string | ReadonlyArray<string>};
+export {Params};
+
+export interface TokenOptions {
+    scheme: string;
+    token?: string;
+    params?: Params;
+}
+
+export interface Token {
+    scheme: string;
+    params: {[key: string]: string | string[]};
+    token: null | string | string[];
+}
+
+export function format(token: TokenOptions): string;
+export function format(scheme: string, token?: string, params?: Params): string;
+
+export function parse(header: string): Token;

types/auth-header/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",
+        "auth-header-tests.ts"
+    ]
+}

types/auth-header/tslint.json

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