import sql from 'mssql'; console.log(sql); // returns undefined-CodePudding

I am trying to create a CRUD in Nest.js with SQL Server. I have installed the following packages:

mssql

As you can see I get nothing in response and also my Nest.js server has crashed.

Complete log:

> cajero-backend@0.0.1 start C:\Users\carlo\Desktop\cajero\backend\cajero-backend
> nest start

[Nest] 11944  - 09/10/2021 16:11:32     LOG [NestFactory] Starting Nest application...
[Nest] 11944  - 09/10/2021 16:11:32     LOG [InstanceLoader] AppModule dependencies initialized  29ms
[Nest] 11944  - 09/10/2021 16:11:32     LOG [RoutesResolver] AppController {/}:  7ms
[Nest] 11944  - 09/10/2021 16:11:32     LOG [RouterExplorer] Mapped {/, GET} route  2ms
[Nest] 11944  - 09/10/2021 16:11:32     LOG [NestApplication] Nest application successfully started  1ms
SQL obj undefined
(node:11944) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'connect' of undefined
    at DatabaseService.getPool (C:\Users\carlo\Desktop\cajero\backend\cajero-backend\src\database\database.service.ts:19:28)
    at AppController.getHello (C:\Users\carlo\Desktop\cajero\backend\cajero-backend\src\app.controller.ts:15:13)
    at C:\Users\carlo\Desktop\cajero\backend\cajero-backend\node_modules\@nestjs\core\router\router-execution-context.js:38:29
    at InterceptorsConsumer.intercept (C:\Users\carlo\Desktop\cajero\backend\cajero-backend\node_modules\@nestjs\core\interceptors\interceptors-consumer.js:11:20)
    at C:\Users\carlo\Desktop\cajero\backend\cajero-backend\node_modules\@nestjs\core\router\router-execution-context.js:46:60
    at C:\Users\carlo\Desktop\cajero\backend\cajero-backend\node_modules\@nestjs\core\router\router-proxy.js:9:23
    at Layer.handle [as handle_request] (C:\Users\carlo\Desktop\cajero\backend\cajero-backend\node_modules\express\lib\router\layer.js:95:5)
    at next (C:\Users\carlo\Desktop\cajero\backend\cajero-backend\node_modules\express\lib\router\route.js:137:13)
    at Route.dispatch (C:\Users\carlo\Desktop\cajero\backend\cajero-backend\node_modules\express\lib\router\route.js:112:3)
    at Layer.handle [as handle_request] (C:\Users\carlo\Desktop\cajero\backend\cajero-backend\node_modules\express\lib\router\layer.js:95:5)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:11944) 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(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)
(node:11944) [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.

Something that grabbed my attention is that sql is undefined in database.service.ts How can I fix this? What am I doing wrong?

CodePudding user response：

try import * as sql from 'mssql';

CodePudding user response：

I just fixed it!

I added "esModuleInterop": true, in tsconfig.json and the problem was solved. Don't know why tho. Can someone please explain? :)