DATABASE_URL verification still attempted when datasource override provided in PrismaClient constructor

Bug description

https://www.prisma.io/docs/reference/tools-and-interfaces/prisma-client/constructor#datasources

When attempting to connect to the prisma client which is configured with an explicit datasource location:

const prisma = new PrismaClient({
  datasources: { postgresql: { url: "postgres://****:****@localhost:5432/****?schema=foo" } },
});
...
await prisma.$connect();

I get the following error:

(node:99546) UnhandledPromiseRejectionWarning: Error: error: Environment variable not found: DATABASE_URL.
  -->  schema.prisma:5
   | 
 4 | datasource postgresql {
 5 |   url      = env("DATABASE_URL")
   | 

Validation Error Count: 1
    at Oe.Yu.default.on.c (/Users/timleslie/src/prisma-issue/node_modules/@prisma/client/engine-core/src/NodeEngine.ts:591:29)
    at Oe.emit (events.js:197:13)
    at Oe.EventEmitter.emit (domain.js:439:20)
    at addChunk (_stream_readable.js:288:12)
    at readableAddChunk (_stream_readable.js:269:11)
    at Oe.Readable.push (_stream_readable.js:224:10)
    at Oe.Transform.push (_stream_transform.js:151:32)
    at Oe._pushBuffer (/Users/timleslie/src/prisma-issue/node_modules/@prisma/client/engine-core/src/byline.ts:116:17)
    at Oe._transform (/Users/timleslie/src/prisma-issue/node_modules/@prisma/client/engine-core/src/byline.ts:107:8)
    at Oe.Transform._read (_stream_transform.js:190:10)
(node:99546) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:99546) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

How to reproduce

// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

datasource postgresql {
  url      = env("DATABASE_URL")
  provider = "postgresql"
}

generator client {
  provider = "prisma-client-js"
}

model User {
  id       Int     @id @default(autoincrement())
  name     String?
}

Expected behavior

I would expect the client to never look for the DATABASE_URL environment variable if the override has been provided.

Environment & setup

• OS: OSX 10.15.6
• Database: PostgreSQL 12.2
• Node.js version: 12.11.0
• Prisma version: 2.7.1

[dpetrick]

This is fixed an will be in the 2.11 release.

[pantharshit00]

@DustinJSilk We are aware of this problem and we intent to tackle it in this sprint(bi weekly release schedule).

There are lot of pending issues so I wouldn’t guarantee it will 100% make it in the next release but we are aware that this is pain point.