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To avoid to have warnings and errors in Travis log, regarding Javascript lint, you can use the OCA Tools pylint-odoo.
git clone https://github.com/OCA/pylint-odoo cd pylint-odoo eslint --fix --config pylint_odoo/examples/.jslintrc $MY_MODULE_PATH
This command will fix most of the lint error syntax, and list the errors the tools can not fix automatically. You can then fix them manually.