Add koa-redis type definitions (#16179)

types/koa-redis/index.d.ts

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+// Type definitions for koa-redis 3.0
+// Project: https://github.com/koajs/koa-redis
+// Definitions by: Nick Simmons <https://github.com/nsimmons>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import {ClientOpts} from 'redis';
+import {SessionStore} from 'koa-generic-session';
+
+declare namespace redisStore {
+    interface RedisOptions extends ClientOpts {
+        duplicate?: boolean;
+        client?: any;
+    }
+}
+
+declare function redisStore(options: redisStore.RedisOptions): SessionStore;
+export = redisStore;

types/koa-redis/koa-redis-tests.ts

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+import * as Koa from "koa";
+import {MemoryStore, Session} from "koa-generic-session";
+import session = require("koa-generic-session");
+import redisStore = require("koa-redis");
+
+const app = new Koa();
+
+app.use(session({
+    store: redisStore({
+      url: 'redis://url:123',
+      host: 'redisHost',
+      port: 123,
+      path: 'redis/path',
+      db: '2',
+      duplicate: false,
+      client: {}
+  })
+}));
+
+app.listen(80);

types/koa-redis/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "koa-redis-tests.ts"
+    ]
+}

types/koa-redis/tslint.json

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