warning egg-bin > espower-typescript > espower-source > espower > escallmatch > call-matcher > core-js@2.6.11: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
warning eslint > file-entry-cache > flat-cache > circular-json@0.3.3: CircularJSON is in maintenance only, flatted is its successor.
[3/5] Fetching packages...
info There appears to be trouble with your network connection. Retrying...
error An unexpected error occurred: "https://registry.yarnpkg.com/babel-plugin-transform-es2015-modules-umd/-/babel-plugin-transform-es2015-modules-umd-6.24.1.tgz: ETIMEDOUT".
info If you think this is a bug, please open a bug report with the information provided in "/usr/src/app/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
The command '/bin/sh -c yarn install' returned a non-zero code: 1
section_end:1587539974:build_script
section_start:1587539974:after_script
section_end:1587539974:after_script
section_start:1587539974:upload_artifacts_on_failure
section_end:1587539974:upload_artifacts_on_failure
ERROR: Job failed: exit status 1