Logger given to WebClient is destructively modified

[seratch]

Description

The Logger instance given to WebClient is destructively modified with a static name "WebClient" and also given logLevel.

• https://github.com/slackapi/node-slack-sdk/blob/%40slack/web-api%405.6.0/packages/web-api/src/WebClient.ts#L107
• https://github.com/slackapi/node-slack-sdk/blob/%40slack/web-api%405.6.0/packages/web-api/src/logger.ts#L19-L22

This particularly affects Bolt apps. The name of all the logs generated by Bolt apps is forcibly set as WebClient:{instanceId}.

I'll come up with a pull request suggesting a possible solution to address this issue.

What type of issue is this? (place an x in one of the [ ])

• bug
• enhancement (feature request)
• question
• documentation related
• testing related
• discussion

Requirements (place an x in each of the [ ])

• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've searched for any related issues and avoided creating a duplicate issue.

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Bug Report

Filling out the following details about bugs will help us solve your issue sooner.

Packages:

Select all that apply:

• @slack/web-api
• @slack/events-api
• @slack/interactive-messages
• @slack/rtm-api
• @slack/webhooks
• I don't know

Reproducible in:

package version: all
node version: any
OS version(s): any

Steps to reproduce:

A Bolt app as below reproduces the issue.

const { App } = require('@slack/bolt');
const { ConsoleLogger, LogLevel } = require('@slack/logger');
const logger = new ConsoleLogger();
const app = new App({
  logger: logger,
  token: process.env.SLACK_BOT_TOKEN,
  signingSecret: process.env.SLACK_SIGNING_SECRET
});

Expected result:

Already stated in the description.

Actual result:

Already stated in the description.

Attachments:

None.