This PR fixes redux dev tools which broke due to the webpack 4 upgrade. The `process.node.ENV` variable is no longer defined, so I define the new `WEBPACK_MODE` variable and use its value to set redux dev tools or not.
@kristw @mistercrunch @xtinec @michellethomas @graceguo-supercat [ Full content available at: https://github.com/apache/incubator-superset/pull/5855 ] This message was relayed via gitbox.apache.org for [email protected]
