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Migrate 'nextjs-with-mongodb' example to TypeScript

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	`1`	`+import { MongoClient } from "mongodb";`
	`2`	`+`
	`3`	`+if (!process.env.MONGODB_URI) {`
	`4`	`+ throw new Error('Invalid/Missing environment variable: "MONGODB_URI"');`
	`5`	`+}`
	`6`	`+`
	`7`	`+const uri = process.env.MONGODB_URI;`
	`8`	`+const options = {};`
	`9`	`+`
	`10`	`+let client;`
	`11`	`+let clientPromise: Promise<MongoClient>;`
	`12`	`+`
	`13`	`+if (process.env.NODE_ENV === "development") {`
	`14`	`+ // In development mode, use a global variable so that the value`
	`15`	`+ // is preserved across module reloads caused by HMR (Hot Module Replacement).`
	`16`	`+ let globalWithMongo = global as typeof globalThis & {`
	`17`	`+ _mongoClientPromise?: Promise<MongoClient>;`
	`18`	`+ };`
	`19`	`+`
	`20`	`+ if (!globalWithMongo._mongoClientPromise) {`
	`21`	`+ client = new MongoClient(uri, options);`
	`22`	`+ globalWithMongo._mongoClientPromise = client.connect();`
	`23`	`+ }`
	`24`	`+ clientPromise = globalWithMongo._mongoClientPromise;`
	`25`	`+} else {`
	`26`	`+ // In production mode, it's best to not use a global variable.`
	`27`	`+ client = new MongoClient(uri, options);`
	`28`	`+ clientPromise = client.connect();`
	`29`	`+}`
	`30`	`+`
	`31`	`+// Export a module-scoped MongoClient promise. By doing this in a`
	`32`	`+// separate module, the client can be shared across functions.`
	`33`	`+export default clientPromise;`

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