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This pull request lays some foundations for the Introduce JavaScript testing framework task mentioned in the Feature Ideas.
As a first step to ensure the quality of the JavaScript code, this pull request forces ESlint to be run during the CI. In the future once some JavaScript tests are included in the project, it will be very simple to extend the CI to also run the tests: just add another line similar to
npm run lint
totools/ci.sh
and we're good to go.The pull request also fixes all the current simple ESlint failures and disables some others. In the future, I expect to re-activate some of the disabled rules and add more linting rules, e.g. for Vue, but for now I wanted to keep the changes small.
To make it easier to have access to all the CI requirements (Python, Node, etc.), this pull request also moves the Travis CI to be fully based on the Docker image so that we're in full control of the CI environment and can also very easily run the exact same CI steps which Travis executes locally as a developer.