types: add types of whatwg-encoding (#43328)

* types: add types of whatwg-encoding

* rename to tests

types/whatwg-encoding/index.d.ts

@@ -0,0 +1,10 @@
+// Type definitions for whatwg-encoding 1.0
+// Project: https://github.com/jsdom/whatwg-encoding
+// Definitions by: fengkx <https://github.com/fengkx>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+export function decode(buffer: Buffer, fallbackEncodingName: string): string;
+export function labelToName(label: string): string | null;
+export function isSupported(name: string): boolean;
+export function getBOMEncoding(buffer: Buffer): string | null;

types/whatwg-encoding/tsconfig.json

@@ -0,0 +1,16 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": ["index.d.ts", "whatwg-encoding-tests.ts"]
+}

types/whatwg-encoding/tslint.json

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

types/whatwg-encoding/whatwg-encoding-tests.ts

@@ -0,0 +1,17 @@
+import whatwgEncoding = require('whatwg-encoding');
+
+console.assert(whatwgEncoding.labelToName('latin1') === 'windows-1252');
+console.assert(whatwgEncoding.labelToName('  CYRILLic ') === 'ISO-8859-5');
+
+console.assert(whatwgEncoding.isSupported('IBM866'));
+
+// Not supported by the Encoding Standard
+console.assert(!whatwgEncoding.isSupported('UTF-32'));
+
+// In the Encoding Standard, but this package can't decode it
+console.assert(!whatwgEncoding.isSupported('x-mac-cyrillic'));
+
+console.assert(whatwgEncoding.getBOMEncoding(Buffer.from([0xfe, 0xff])) === 'UTF-16BE');
+console.assert(whatwgEncoding.getBOMEncoding(Buffer.from([0x48, 0x69])) === null);
+
+console.assert(whatwgEncoding.decode(Buffer.from([0x48, 0x69]), 'UTF-8') === 'Hi');