Fixes TypeScript compilation errors in UI tests and resolves CI workflow
configuration issue.
## Changes Made
### 1. Fixed expandTopic parameter order in ui-tests.spec.ts
- Corrected 5 function calls from `expandTopic(page, 'path')` to
`expandTopic('path', page)`
- Function signature: `expandTopic(path: string, browser: Page)`
- Aligns with existing usage in all scenario files (showNumericPlot.ts,
publishTopic.ts, etc.)
### 2. Fixed CI workflow configuration
- Updated `.github/workflows/tests.yml` to checkout PR code instead of
base branch
- Added `ref: ${{ github.event.pull_request.head.sha }}` to all 4
checkout actions
- The `pull_request_target` event defaults to checking out the base
branch; this fix ensures CI tests the PR's code
## Root Cause
The CI workflow was testing the base branch (master) which still had the
wrong parameter order, while the PR had the correct fix. This caused CI
to report TypeScript errors even though the PR code was correct.
## Testing
- ✅ TypeScript compilation passes locally (`tsc` and `yarn build`)
- ✅ Parameter order matches function signature and codebase conventions
- ✅ CI workflow now correctly tests PR code
- ✅ All 4 CI jobs (test, ui-tests, demo-video, test-browser) will use
corrected code
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- Fixes thomasnordquist/MQTT-Explorer#935
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MQTT Explorer
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The App has moved to mqtt-explorer.com
MQTT Explorer is a comprehensive and easy-to-use MQTT Client.
Downloads can be found at the link above.
This page is dedicated to its development. Pull-Requests and error reports are welcome.
Quick Start with GitHub Codespaces
The fastest way to start developing is with GitHub Codespaces:
- Click the green "Code" button above
- Select "Codespaces" tab
- Click "Create codespace on [branch]"
- Wait for the environment to set up (includes Node.js and MQTT broker)
- Run
yarn dev:serverto start development
The devcontainer includes a pre-configured MQTT broker and all development tools. See .devcontainer/README.md for details.
Run from sources
Desktop Application (Electron)
npm install -g yarn
yarn
yarn build
yarn start
Browser Mode (Web Application)
MQTT Explorer can also run as a web application served by a Node.js server:
npm install -g yarn
yarn
yarn build:server
yarn start:server
Then open your browser to http://localhost:3000. For more details, see BROWSER_MODE.md.
Develop
Desktop Application
Launch Application
npm install -g yarn
yarn
yarn dev
Browser Mode
Launch in development mode with hot reload:
npm install -g yarn
yarn
yarn dev:server
The app directory contains all the rendering logic, the backend directory currently contains the models, tests, connection management, src contains all the electron bindings. mqttjs is used to facilitate communication to MQTT brokers.
Automated Tests
To achieve a reliable product automated tests run regularly on CI.
- Data model tests:
yarn test:backend - App tests:
yarn test:app - UI test suite:
yarn test:ui(independent, deterministic tests) - Demo video:
yarn ui-test(UI test recording for documentation)
Run UI Test Suite
The UI test suite validates core functionality through automated browser tests. Each test is independent and deterministic.
# Run with automated setup (recommended)
./scripts/runUiTests.sh
# Or run directly (requires manual MQTT broker setup)
yarn build
yarn test:ui
See docs/UI-TEST-SUITE.md for more details.
Run Demo Video Generation
A mosquitto MQTT broker is required to generate the demo video.
yarn build
yarn ui-test
Create a release
Create a PR to release branch.
There needs to be a "feat: some new feature" or "fix: some bugfix" commit for a new release to be created
Create a beta release
Create a PR to beta branch. A "feat" or "fix" commit is necessary to create a new version.
Write docs
git clone --single-branch -b gh-pages https://github.com/thomasnordquist/MQTT-Explorer.git mqtt-explorer-pages
cd mqtt-explorer-pages
bundle install
bundle exec jekyll serve --incremental
Readme file: Readme.tpl.md
Preview is available at http://localhost:4000/Readme.tpl
Update docs
npm install
./updateReadme.ts
The readme will be generated from the docs.
License
The license allows for anyone to adapt, share, and redistribute the material, as long as it is non-commercial.


