Add type definitions for the i18n-abide package. (#29855)

* Add type definitions for the i18n-abide library.

* Fix test and tsconfig.

types/i18n-abide/i18n-abide-tests.ts

@@ -0,0 +1,38 @@
+import * as i18n from 'i18n-abide';
+
+const emptyAbideOptions: i18n.AbideOptions = {};
+const fullAbideOptions: i18n.AbideOptions = {
+    gettext_alias: 'gettext',
+    supported_languages: ['en-US'],
+    default_lang: 'en-US',
+    debug_lang: 'it-CH',
+    disable_locale_check: false,
+    translation_directory: 'l18n/',
+    logger: { warn(msg: string) {}, error(msg: string) {} },
+};
+
+i18n.abide(); // $ExpectType RequestHandler
+i18n.abide(emptyAbideOptions); // $ExpectType RequestHandler
+i18n.abide(fullAbideOptions); // $ExpectType RequestHandler
+
+i18n.parseAcceptLanguage(""); // $ExpectType { lang: string; quality: number; }[]
+
+i18n.bestLanguage([{lang: 'en-US', quality: 1.0}], ['en-US'], 'en-US'); // $ExpectType string
+
+i18n.localeFrom(); // $ExpectType string
+i18n.localeFrom(""); // $ExpectType string
+
+i18n.languageFrom(); // $ExpectType string
+i18n.languageFrom(""); // $ExpectType string
+
+i18n.normalizeLanguage(); // $ExpectType string
+i18n.normalizeLanguage(""); // $ExpectType string
+
+i18n.normalizeLocale(); // $ExpectType string
+i18n.normalizeLocale(""); // $ExpectType string
+
+i18n.format(""); // $ExpectType string
+i18n.format("", {}); // $ExpectType string
+i18n.format("", {}, false); // $ExpectType string
+
+i18n.getLocales(); // $ExpectType string[]

types/i18n-abide/index.d.ts

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+// Type definitions for i18n-abide 0.0
+// Project: https://github.com/mozilla/i18n-abide
+// Definitions by: Steven Bell <https://github.com/smbell>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+import { RequestHandler } from 'express';
+
+export function abide(options?: AbideOptions): RequestHandler;
+export function parseAcceptLanguage(header?: string): Array<{ lang: string, quality: number }>;
+export function bestLanguage(languages: Array<{ lang: string, quality: number}>, supported_languages: string[], defaultLanguage: string): string;
+export function localeFrom(language?: string): string;
+export function languageFrom(locale?: string): string;
+export function normalizeLanguage(language?: string): string;
+export function normalizeLocale(locale?: string): string;
+export function format(fmt: string, obj?: any, named?: boolean): string;
+export function getLocales(): string[];
+
+export interface AbideOptions {
+    gettext_alias?: string;
+    supported_languages?: string[];
+    default_lang?: string;
+    debug_lang?: string;
+    disable_locale_check?: boolean;
+    translation_directory?: string;
+    logger?: { warn(msg: string): void, error(msg: string): void };
+}

types/i18n-abide/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "i18n-abide-tests.ts"
+    ]
+}

types/i18n-abide/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }