error log is here: https://gist.github.com/seandong/0b377af2ce75e8daa9273ca54a61a591
That looks like compilation error with your code.
It could be related to the release of Node.js v12 that happened on April 23rd, 2019.
Could you tell us what’s does your
node_js key looks like in your .travis.yml file?
node_js: node, could you try to replace it with
node_js: 11.14.0 (i.e. previous Node.js version) and let us know if it helps?