Add types for bcp-47 (#41195)

types/bcp-47/bcp-47-tests.ts

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+import bcp47 = require('bcp-47');
+
+const bcpParse = bcp47.parse;
+const bcpStringify = bcp47.stringify;
+
+const result: bcp47.Schema = bcpParse('en-US');
+
+const locale: string = bcpStringify(result);
+
+const schema: bcp47.Schema = {
+    language: 'en',
+    region: 'US'
+};
+
+bcpStringify(schema);
+
+const parseOptions: bcp47.ParseOptions = {
+    warning: (message: string, code: number, offset: number) => {},
+};
+
+bcpParse('en-US', parseOptions);

types/bcp-47/index.d.ts

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+// Type definitions for bcp-47 1.0
+// Project: https://github.com/wooorm/bcp-47#readme
+// Definitions by: Chris Barth <https://github.com/cjbarth>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export function parse(tag: string, options?: ParseOptions): Schema;
+export function stringify(schema: Schema): string;
+
+export interface ParseOptions {
+    warning?: (errorMessage: string, errorCode: ErrorCodes, offset: number) => void;
+    forgiving?: boolean;
+    normalize?: boolean;
+}
+
+export interface Schema {
+    language?: string;
+    extendedLanguageSubtags?: string[];
+    script?: string;
+    region?: string;
+    variants?: string[];
+    extensions?: LocaleExtension[];
+    privateuse?: string[];
+    regular?: string;
+    irregular?: string;
+}
+
+export interface LocaleExtension {
+    singleton: string;
+    extensions: string[];
+}
+
+export enum ErrorCodes {
+    errVariantTooLong = 1,
+    errExtensionTooLong = 2,
+    errTooManySubtags = 3,
+    errEmptyExtension = 4,
+    errPrivateUseTooLong = 5,
+    errExtraContent = 6,
+}

types/bcp-47/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",
+        "bcp-47-tests.ts"
+    ]
+}

types/bcp-47/tslint.json

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