TypeError: (0 , slack_notify_1.default) is not a function

[adamdry]

This line:
const slack = SlackNotify(MY_SLACK_WEBHOOK_URL)

Gives the error TypeError: (0 , slack_notify_1.default) is not a function

This is the full class, inside a nestjs app:

import { Injectable } from '@nestjs/common'
import { ConfigService } from '@nestjs/config'
import { EnvVariableName } from '../../common/enum/EnvVariableName'
import SlackNotify from 'slack-notify'

@Injectable()
export class SlackNotifier {

    public constructor(configService: ConfigService) {
        const MY_SLACK_WEBHOOK_URL = 'https://hooks.slack.com/services/RANDOMCHARS'
        const slack = SlackNotify(MY_SLACK_WEBHOOK_URL)
    }

    public sendMsg(msg: string) {
        // this.slack.send(msg)
    }
}

[movses]

I had same issue.
Was forced to downgrade to 2.0.2 and add typings manually using this answer.
https://stackoverflow.com/questions/41292559/could-not-find-a-declaration-file-for-module-module-name-path-to-module-nam/51320328#51320328

[andrewchilds]

I was able to reproduce this locally with a vanilla nestjs install. After a bit of research, I found that adding "esModuleInterop": true to the project tsconfig.json file resolves this issue. See https://stackoverflow.com/a/61530428/440094 for more detail.

I've tried to make slack-notify available both as a CJS and ESM module. If anyone knows of another way to configure package.json that continues to provide support for both formats, while also resolving this issue without needing to add esModuleInterop flag, please chime in here.

[rohithadg]

Me too having same issue. I tried above workaround but no luck.
Does anyone has workaround?

[JayBox325]

I think this is the same issue I'm coming up against here on my Next 13 / react 18 app.

My code:

import SlackNotify from 'slack-notify'

export default function NotifySlack() {
    const MY_SLACK_WEBHOOK_URL = 'https://hooks.slack.com/services/xxx/yyy/zzz'
    const slack = SlackNotify(MY_SLACK_WEBHOOK_URL)

    slack.send('Hello!')
        .then(() => {
            console.log('notified slack!')
        }).catch((err) => {
            console.error('slack error', err)
        })
}

This is throwing the following in the browser when I fire this function: slack error TypeError: The "listener" argument must be of type Function. Received type object

This issue here is the only one that I seem to find when I try and find a solution, hopefully this is something simple to resolve.