Duplicate from khanon/oai-proxy

Co-authored-by: anon <khanon@users.noreply.huggingface.co>

.env.example

@@ -0,0 +1,20 @@
+# Copy this file to .env and fill in the values.
+
+# Uncomment the following line and replace the value with your own secret key
+# to control access to the proxy server
+# PROXY_KEY=your-secret-key
+
+# Set your OpenAI API key below.
+OPENAI_KEY=sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+
+# You can also set a base-64 encoded JSON array of keys matching this schema:
+# Trial keys will be prioritized. GPT4-enabled keys are necessary to use GPT-4.
+# For example:
+# [
+#  { "key": "your-openai-key-1", "isTrial": true, "isGpt4": false },
+#  { "key": "your-openai-key-2", "isTrial": false, "isGpt4": false },
+#  { "key": "your-openai-key-3", "isTrial": false, "isGpt4": true }
+# ]
+# Encoded in base-64, this would look like:
+# OPENAI_KEYS=WwogeyAia2V5IjogInlvdXItb3BlbmFpLWtleS0xIiwgImlzVHJpYWwiOiB0cnVlLCAiaXNHcHQ0IjogZmFsc2UgfSwKIHsgImtleSI6ICJ5b3VyLW9wZW5haS1rZXktMiIsICJpc1RyaWFsIjogZmFsc2UsICJpc0dwdDQiOiBmYWxzZSB9LAogeyAia2V5IjogInlvdXItb3BlbmFpLWtleS0zIiwgImlzVHJpYWwiOiBmYWxzZSwgImlzR3B0NCI6IHRydWUgfQpd
+  

.gitattributes

@@ -0,0 +1,34 @@
+*.7z filter=lfs diff=lfs merge=lfs -text
+*.arrow filter=lfs diff=lfs merge=lfs -text
+*.bin filter=lfs diff=lfs merge=lfs -text
+*.bz2 filter=lfs diff=lfs merge=lfs -text
+*.ckpt filter=lfs diff=lfs merge=lfs -text
+*.ftz filter=lfs diff=lfs merge=lfs -text
+*.gz filter=lfs diff=lfs merge=lfs -text
+*.h5 filter=lfs diff=lfs merge=lfs -text
+*.joblib filter=lfs diff=lfs merge=lfs -text
+*.lfs.* filter=lfs diff=lfs merge=lfs -text
+*.mlmodel filter=lfs diff=lfs merge=lfs -text
+*.model filter=lfs diff=lfs merge=lfs -text
+*.msgpack filter=lfs diff=lfs merge=lfs -text
+*.npy filter=lfs diff=lfs merge=lfs -text
+*.npz filter=lfs diff=lfs merge=lfs -text
+*.onnx filter=lfs diff=lfs merge=lfs -text
+*.ot filter=lfs diff=lfs merge=lfs -text
+*.parquet filter=lfs diff=lfs merge=lfs -text
+*.pb filter=lfs diff=lfs merge=lfs -text
+*.pickle filter=lfs diff=lfs merge=lfs -text
+*.pkl filter=lfs diff=lfs merge=lfs -text
+*.pt filter=lfs diff=lfs merge=lfs -text
+*.pth filter=lfs diff=lfs merge=lfs -text
+*.rar filter=lfs diff=lfs merge=lfs -text
+*.safetensors filter=lfs diff=lfs merge=lfs -text
+saved_model/**/* filter=lfs diff=lfs merge=lfs -text
+*.tar.* filter=lfs diff=lfs merge=lfs -text
+*.tflite filter=lfs diff=lfs merge=lfs -text
+*.tgz filter=lfs diff=lfs merge=lfs -text
+*.wasm filter=lfs diff=lfs merge=lfs -text
+*.xz filter=lfs diff=lfs merge=lfs -text
+*.zip filter=lfs diff=lfs merge=lfs -text
+*.zst filter=lfs diff=lfs merge=lfs -text
+*tfevents* filter=lfs diff=lfs merge=lfs -text

.gitignore

@@ -0,0 +1,4 @@
+.vscode
+.env
+build
+node_modules

Dockerfile

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+FROM node:18-bullseye-slim
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+RUN npm run build
+
+EXPOSE 7860
+
+CMD [ "npm", "start" ]

README.md

@@ -0,0 +1,54 @@
+---
+title: oai-reverse-proxy
+emoji: 🔁
+colorFrom: green
+colorTo: purple
+sdk: docker
+pinned: false
+duplicated_from: khanon/oai-proxy
+---
+<!-- -->
+# OAI Reverse Proxy Server
+
+Simple reverse proxy server for the OpenAI API.
+
+## What is this?
+If you have an API key you want to share with a friend, you can use this to keep your key safe while still allowing them to generate text with the API.
+
+## Why?
+OpenAI keys have full account permissions. They can revoke themselves, generate new keys, modify spend quotas, etc. You absolutely should not share them.
+
+If you still want to share access to your key, you can put it behind this proxy to ensure it can't be used to do anything but generate text.  You can also set a separate key on the proxy to gatekeep access.
+
+## How to use
+
+### 1. Get an API key
+- Go to [OpenAI](https://openai.com/) and sign up for an account.
+
+### 2. Clone this Huggingface repository to your account
+- Go to [Huggingface](https://huggingface.co/) and sign up for an account.
+- Once logged in, click on the `+` button in the top right corner and select `Duplicate this Space`.
+
+![Duplicate Space](https://files.catbox.moe/3n6ubn.png)
+
+### 3. Set your OpenAI API key as a secret
+- Click the Settings button in the top right corner of your repository.
+- Scroll down to the `Repository Secrets` section and click `New Secret`.
+
+![Secrets](https://files.catbox.moe/irrp2p.png)
+
+- Enter `OPENAI_KEY` as the name and your OpenAI API key as the value.
+
+![New Secret](https://files.catbox.moe/ka6s1a.png)
+
+**Do not paste the key into `server.js`!** That file is public and anyone can see it. Leave it alone; it will load the key from the secret you just created.
+
+### 4. Deploy the server
+- Your server should automatically deploy when you add the secret, but if not you can select `Factory Reset` from that same Settings menu.
+
+### 5. Share the link
+- The Service Info section below should show the URL for your server. You can share this with anyone to safely give them access to your OpenAI API key.
+- Your friend doesn't need any OpenAI API key of their own, they just need your link.
+- However, if you want to protect access to the server, you can add another secret called `PROXY_KEY`.  This key will need to be passed in the Authentication header of every request to the server, just like an OpenAI API key.
+
+**Note:** The `keys` section in the serverinfo screen may not correctly identify keys as trial/paid/GPT-4 unless you use the more advanced configuration described in `.env.example`.

package-lock.json

@@ -0,0 +1,1629 @@
+{
+  "name": "oai-reverse-proxy",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
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+        "pino-http": "^8.3.3",
+        "showdown": "^2.1.0"
+      },
+      "devDependencies": {
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+        "@types/showdown": "^2.0.0",
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+    "node_modules/utils-merge": {
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+      "dev": true
+    },
+    "node_modules/vary": {
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+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
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+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/yn": {
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+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "dev": true,
+      "engines": {
+        "node": ">=6"
+      }
+    }
+  }
+}

package.json

@@ -0,0 +1,28 @@
+{
+  "name": "oai-reverse-proxy",
+  "version": "1.0.0",
+  "description": "Reverse proxy for the OpenAI API",
+  "scripts": {
+    "build": "tsc",
+    "start:dev": "nodemon --watch src --exec ts-node src/server.ts",
+    "start": "node build/server.js"
+  },
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "dotenv": "^16.0.3",
+    "express": "^4.18.2",
+    "http-proxy-middleware": "^3.0.0-beta.1",
+    "pino-http": "^8.3.3",
+    "showdown": "^2.1.0"
+  },
+  "devDependencies": {
+    "@types/cors": "^2.8.13",
+    "@types/express": "^4.17.17",
+    "@types/showdown": "^2.0.0",
+    "nodemon": "^2.0.22",
+    "ts-node": "^10.9.1",
+    "typescript": "^5.0.4"
+  }
+}

src/info-page.ts

@@ -0,0 +1,51 @@
+import { Request, Response } from "express";
+import showdown from "showdown";
+import { keys } from "./keys";
+
+export const handleInfoPage = (req: Request, res: Response) => {
+  // Huggingface puts spaces behind some cloudflare ssl proxy, so `req.protocol` is `http` but the correct URL is actually `https`
+  const host = req.get("host");
+  const isHuggingface = host?.includes("hf.space");
+  const protocol = isHuggingface ? "https" : req.protocol;
+  res.send(getInfoPageHtml(protocol + "://" + host));
+};
+
+function getInfoPageHtml(host: string) {
+  const keylist = keys.list();
+  const info = {
+    message: "OpenAI Reverse Proxy",
+    uptime: process.uptime(),
+    timestamp: Date.now(),
+    baseUrl: host,
+    kobold: host + "/proxy/kobold" + " (not yet implemented)",
+    openai: host + "/proxy/openai",
+    keys: {
+      all: keylist.length,
+      active: keylist.filter((k) => !k.isDisabled).length,
+      trial: keylist.filter((k) => k.isTrial).length,
+      gpt4: keylist.filter((k) => k.isGpt4).length,
+      proompts: keylist.reduce((acc, k) => acc + k.promptCount, 0),
+    },
+  };
+
+  const readme = require("fs").readFileSync("README.md", "utf8");
+  const readmeBody = readme.split("---")[2];
+  const converter = new showdown.Converter();
+  const html = converter.makeHtml(readmeBody);
+
+  const pageBody = `<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>OpenAI Reverse Proxy</title>
+  </head>
+  <body style="font-family: sans-serif; background-color: #f0f0f0; padding: 1em;"
+    ${html}
+    <hr />
+    <h2>Service Info</h2>
+    <pre>${JSON.stringify(info, null, 2)}</pre>
+  </body>
+</html>`;
+
+  return pageBody;
+}

src/keys.ts

@@ -0,0 +1,130 @@
+/* Manages OpenAI API keys. Tracks usage, disables expired keys, and provides
+round-robin access to keys. Keys are stored in the OPENAI_KEY environment
+variable, either as a single key, or a base64-encoded JSON array of keys.*/
+import { logger } from "./logger";
+import crypto from "crypto";
+
+/** Represents a key stored in the OPENAI_KEY environment variable. */
+type KeySchema = {
+  /** The OpenAI API key itself. */
+  key: string;
+  /** Whether this is a free trial key. These are prioritized over paid keys if they can fulfill the request. */
+  isTrial?: boolean;
+  /** Whether this key has been provisioned for GPT-4. */
+  isGpt4?: boolean;
+};
+
+/** Runtime information about a key. */
+export type Key = KeySchema & {
+  /** Whether this key is currently disabled. We set this if we get a 429 or 401 response from OpenAI. */
+  isDisabled?: boolean;
+  /** Threshold at which a warning email will be sent by OpenAI. */
+  softLimit?: number;
+  /** Threshold at which the key will be disabled because it has reached the user-defined limit. */
+  hardLimit?: number;
+  /** The maximum quota allocated to this key by OpenAI. */
+  systemHardLimit?: number;
+  /** The current usage of this key. */
+  usage?: number;
+  /** The number of prompts that have been sent with this key. */
+  promptCount: number;
+  /** The time at which this key was last used. */
+  lastUsed: number;
+  /** Key hash for displaying usage in the dashboard. */
+  hash: string;
+};
+
+const keyPool: Key[] = [];
+
+function init() {
+  const keyString = process.env.OPENAI_KEY;
+  if (!keyString?.trim()) {
+    throw new Error("OPENAI_KEY environment variable is not set");
+  }
+  let keyList: KeySchema[];
+  try {
+    const decoded = Buffer.from(keyString, "base64").toString();
+    keyList = JSON.parse(decoded) as KeySchema[];
+  } catch (err) {
+    logger.info("OPENAI_KEY is not base64-encoded JSON, assuming bare key");
+    // We don't actually know if bare keys are paid/GPT-4 so we assume they are
+    keyList = [{ key: keyString, isTrial: false, isGpt4: true }];
+  }
+  for (const key of keyList) {
+    const newKey = {
+      ...key,
+      isDisabled: false,
+      softLimit: 0,
+      hardLimit: 0,
+      systemHardLimit: 0,
+      usage: 0,
+      lastUsed: 0,
+      promptCount: 0,
+      hash: crypto
+        .createHash("sha256")
+        .update(key.key)
+        .digest("hex")
+        .slice(0, 6),
+    };
+    keyPool.push(newKey);
+
+    logger.info({ key: newKey.hash }, "Key added");
+  }
+  // TODO: check each key's usage upon startup.
+}
+
+function list() {
+  return keyPool.map((key) => ({
+    ...key,
+    key: undefined,
+  }));
+}
+
+function disable(key: Key) {
+  const keyFromPool = keyPool.find((k) => k.key === key.key)!;
+  if (keyFromPool.isDisabled) return;
+  keyFromPool.isDisabled = true;
+  logger.warn({ key: key.hash }, "Key disabled");
+}
+
+function anyAvailable() {
+  return keyPool.some((key) => !key.isDisabled);
+}
+
+function get(model: string) {
+  const needsGpt4Key = model.startsWith("gpt-4");
+  const availableKeys = keyPool.filter(
+    (key) => !key.isDisabled && (!needsGpt4Key || key.isGpt4)
+  );
+  if (availableKeys.length === 0) {
+    let message = "No keys available. Please add more keys.";
+    if (needsGpt4Key) {
+      message =
+        "No GPT-4 keys available. Please add more keys or use a non-GPT-4 model.";
+    }
+    logger.error(message);
+    throw new Error(message);
+  }
+
+  // Prioritize trial keys
+  const trialKeys = availableKeys.filter((key) => key.isTrial);
+  if (trialKeys.length > 0) {
+    logger.info({ key: trialKeys[0].hash }, "Using trial key");
+    trialKeys[0].lastUsed = Date.now();
+    return trialKeys[0];
+  }
+
+  // Otherwise, return the oldest key
+  const oldestKey = availableKeys.sort((a, b) => a.lastUsed - b.lastUsed)[0];
+  logger.info({ key: oldestKey.hash }, "Assigning key to request.");
+  oldestKey.lastUsed = Date.now();
+  return { ...oldestKey };
+}
+
+function incrementPrompt(keyHash?: string) {
+  if (!keyHash) return;
+  const key = keyPool.find((k) => k.hash === keyHash)!;
+  key.promptCount++;
+}
+
+export const keys = { init, list, get, anyAvailable, disable, incrementPrompt };

src/logger.ts

@@ -0,0 +1,3 @@
+import pino from "pino";
+
+export const logger = pino();

src/proxy/auth.ts

@@ -0,0 +1,16 @@
+import type { Request, Response, NextFunction } from "express";
+
+const PROXY_KEY = process.env.PROXY_KEY;
+
+export const auth = (req: Request, res: Response, next: NextFunction) => {
+  if (!PROXY_KEY) {
+    next();
+    return;
+  }
+  if (req.headers.authorization === `Bearer ${PROXY_KEY}`) {
+    delete req.headers.authorization;
+    next();
+  } else {
+    res.status(401).json({ error: "Unauthorized" });
+  }
+};

src/proxy/common.ts

@@ -0,0 +1,88 @@
+import { Request, Response } from "express";
+import * as http from "http";
+import * as httpProxy from "http-proxy";
+import { logger } from "../logger";
+import { keys } from "../keys";
+
+/** Handle and rewrite response to proxied requests to OpenAI */
+export const handleResponse = (
+  proxyRes: http.IncomingMessage,
+  req: Request,
+  res: Response
+) => {
+  const statusCode = proxyRes.statusCode || 500;
+  if (statusCode >= 400) {
+    let body = "";
+    proxyRes.on("data", (chunk) => (body += chunk));
+    proxyRes.on("end", () => {
+      let errorPayload: any = {
+        error: "Proxy couldn't parse error from OpenAI",
+      };
+      const canTryAgain = keys.anyAvailable()
+        ? "You can try again to get a different key."
+        : "There are no more keys available.";
+      try {
+        errorPayload = JSON.parse(body);
+      } catch (err) {
+        logger.error({ error: err }, errorPayload.error);
+        res.json(errorPayload);
+        return;
+      }
+
+      if (statusCode === 401) {
+        // Key is invalid or was revoked
+        logger.warn(
+          `OpenAI key is invalid or revoked. Keyhash ${req.key?.hash}`
+        );
+        keys.disable(req.key!);
+        const message = `The OpenAI key is invalid or revoked. ${canTryAgain}`;
+        errorPayload.proxy_note = message;
+      } else if (statusCode === 429) {
+        // Rate limit exceeded
+        // Annoyingly they send this for:
+        // - Quota exceeded, key is totally dead
+        // - Rate limit exceeded, key is still good but backoff needed
+        // - Model overloaded, their server is overloaded
+        if (errorPayload.error?.type === "insufficient_quota") {
+          logger.warn(`OpenAI key is exhausted. Keyhash ${req.key?.hash}`);
+          keys.disable(req.key!);
+          const message = `The OpenAI key is exhausted. ${canTryAgain}`;
+          errorPayload.proxy_note = message;
+        } else {
+          logger.warn(
+            { errorCode: errorPayload.error?.type },
+            `OpenAI rate limit exceeded or model overloaded. Keyhash ${req.key?.hash}`
+          );
+        }
+      }
+
+      res.status(statusCode).json(errorPayload);
+    });
+  } else {
+    // Increment key's usage count
+    keys.incrementPrompt(req.key?.hash);
+
+    Object.keys(proxyRes.headers).forEach((key) => {
+      res.setHeader(key, proxyRes.headers[key] as string);
+    });
+    proxyRes.pipe(res);
+  }
+};
+
+export const onError: httpProxy.ErrorCallback = (err, _req, res) => {
+  logger.error({ error: err }, "Error proxying to OpenAI");
+
+  (res as http.ServerResponse).writeHead(500, {
+    "Content-Type": "application/json",
+  });
+  res.end(
+    JSON.stringify({
+      error: {
+        type: "proxy_error",
+        message: err.message,
+        proxy_note:
+          "Reverse proxy encountered an error before it could reach OpenAI.",
+      },
+    })
+  );
+};

src/proxy/kobold.ts

@@ -0,0 +1,6 @@
+import { Request, Response, NextFunction } from "express";
+
+export const kobold = (req: Request, res: Response, next: NextFunction) => {
+  // TODO: Implement kobold
+  res.status(501).json({ error: "Not implemented" });
+};

src/proxy/openai.ts

@@ -0,0 +1,58 @@
+import { Request, Router } from "express";
+import * as http from "http";
+import { createProxyMiddleware, fixRequestBody } from "http-proxy-middleware";
+import { logger } from "../logger";
+import { Key, keys } from "../keys";
+import { handleResponse, onError } from "./common";
+
+/**
+ * Modifies the request body to add a randomly selected API key.
+ */
+const rewriteRequest = (proxyReq: http.ClientRequest, req: Request) => {
+  let key: Key;
+
+  try {
+    key = keys.get(req.body?.model || "gpt-3.5")!;
+  } catch (err) {
+    proxyReq.destroy(err as any);
+    return;
+  }
+
+  req.key = key;
+  proxyReq.setHeader("Authorization", `Bearer ${key.key}`);
+
+  if (req.method === "POST" && req.body) {
+    if (req.body?.stream) {
+      req.body.stream = false;
+      const updatedBody = JSON.stringify(req.body);
+      proxyReq.setHeader("Content-Length", Buffer.byteLength(updatedBody));
+      (req as any).rawBody = Buffer.from(updatedBody);
+    }
+
+    // body-parser and http-proxy-middleware don't play nice together
+    fixRequestBody(proxyReq, req);
+  }
+};
+
+const openaiProxy = createProxyMiddleware({
+  target: "https://api.openai.com",
+  changeOrigin: true,
+  on: {
+    proxyReq: rewriteRequest,
+    proxyRes: handleResponse,
+    error: onError,
+  },
+  selfHandleResponse: true,
+  logger,
+});
+
+const openaiRouter = Router();
+openaiRouter.post("/v1/chat/completions", openaiProxy);
+// openaiRouter.post("/v1/completions", openaiProxy); // TODO: Implement Davinci
+openaiRouter.get("/v1/models", openaiProxy);
+openaiRouter.use((req, res) => {
+  logger.warn(`Blocked openai proxy request: ${req.method} ${req.path}`);
+  res.status(404).json({ error: "Not found" });
+});
+
+export const openai = openaiRouter;

src/proxy/routes.ts

@@ -0,0 +1,18 @@
+/* Accepts incoming requests at either the /kobold or /openai routes and then
+routes them to the appropriate handler to be forwarded to the OpenAI API.
+Incoming OpenAI requests are more or less 1:1 with the OpenAI API, but only a
+subset of the API is supported. Kobold requests must be transformed into
+equivalent OpenAI requests. */
+
+import * as express from "express";
+import { auth } from "./auth";
+import { kobold } from "./kobold";
+import { openai } from "./openai";
+
+const router = express.Router();
+
+router.use(auth);
+router.use("/kobold", kobold);
+router.use("/openai", openai);
+
+export { router as proxyRouter };

src/server.ts

@@ -0,0 +1,40 @@
+import dotenv from "dotenv";
+dotenv.config();
+import express from "express";
+import cors from "cors";
+import pinoHttp from "pino-http";
+import { logger } from "./logger";
+import { keys } from "./keys";
+import { proxyRouter } from "./proxy/routes";
+import { handleInfoPage } from "./info-page";
+
+const PORT = process.env.PORT || 7860;
+
+const app = express();
+// middleware
+app.use(pinoHttp({ logger }));
+app.use(cors());
+app.use(
+  express.json({ limit: "10mb" }),
+  express.urlencoded({ extended: true, limit: "10mb" })
+);
+// routes
+app.get("/", handleInfoPage);
+app.use("/proxy", proxyRouter);
+// 500 and 404
+app.use((err: any, _req: unknown, res: express.Response, _next: unknown) => {
+  if (err.status) {
+    res.status(err.status).json({ error: err.message });
+  } else {
+    logger.error(err);
+    res.status(500).json({ error: "Internal server error" });
+  }
+});
+app.use((_req: unknown, res: express.Response) => {
+  res.status(404).json({ error: "Not found" });
+});
+// start server and load keys
+app.listen(PORT, () => {
+  logger.info(`Server listening on port ${PORT}`);
+  keys.init();
+});

src/types/custom.d.ts

@@ -0,0 +1,10 @@
+import { Express } from "express-serve-static-core";
+import { Key } from "../keys";
+
+declare global {
+  namespace Express {
+    interface Request {
+      key?: Key;
+    }
+  }
+}

tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+    "strict": true,
+    "target": "ES2020",
+    "module": "CommonJS",
+    "moduleResolution": "node",
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "skipLibCheck": true,
+    "skipDefaultLibCheck": true,
+    "outDir": "build"
+  },
+  "include": ["src"],
+  "exclude": ["node_modules"],
+  "files": ["src/types/custom.d.ts"]
+}