`qa-frontend-node:10` job failed in incremental_webpack_compiler.js:11

qa-frontend-node:10 job failed

Failure:

$ NODE_OPTIONS="--max-old-space-size=3584" NODE_ENV=production webpack --config config/webpack.config.js
/builds/gitlab-org/gitlab/config/helpers/incremental_webpack_compiler.js:11
  enabled = false;
          ^
SyntaxError: Unexpected token =

The same line enabled = false also exists on line 23.

This job passed in qa-frontend-node:latest.

Instance class fields are only supported in node 12.4.0 onwards. https://node.green/#ESNEXT-candidate--stage-3--instance-class-fields