Prepare Webhook URL

To create an incoming webhook, go to https://api.slack.com/apps, and create a new app, and an incoming webhook from there.

Go to GitHub, and Settings > Secrets > Actions > Repository secrets, and create SLACK_WEBHOOK_URL to test.

How to Develop

Switch to pre branch:

$ git checkout pre

Install the dependencies

$ npm install

Build the typescript and run tests

$ npm run all

Git push to run GitHub Actions.

$ git push origin pre

Send PR from pre branch to main branch, and merge it.

Update version in package.json.

Send PR from pre branch to main branch, and merge it. Send PR from main branch to v3 branch, and merge it.

Add a tag with a release version.

$ git tag v3.x.x
$ git push origin refs/tags/v3.x.x

Edit > Update release with Publish this Action to the GitHub Marketplace checked.