CLI ships with optional chaining operators, unsupported by Node 12

bundle exec rake appmap:swagger
rake aborted!
AppMap::CommandError: Command failed: ["node", "/Users/ptrdvrk/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/appmap-0.65.1/node_modules/@appland/appmap/src/cli.js", "swagger"]; stderr: /Users/ptrdvrk/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/appmap-0.65.1/node_modules/@appland/appmap/src/agentInstaller/javaAgentInstaller.js:160
stderr:       projectSection?.appendChild(doc.createElement('build'));
stderr:                      ^
stderr:
stderr: SyntaxError: Unexpected token .
stderr:     at Module._compile (internal/modules/cjs/loader.js:703:23)
stderr:     at Object.Module._extensions..js (internal/modules/cjs/loader.js:770:10)
stderr:     at Module.load (internal/modules/cjs/loader.js:628:32)
stderr:     at Function.Module._load (internal/modules/cjs/loader.js:555:12)
stderr:     at Module.require (internal/modules/cjs/loader.js:666:19)
stderr:     at require (internal/modules/cjs/helpers.js:16:16)
stderr:     at Object.<anonymous> (/Users/ptrdvrk/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/appmap-0.65.1/node_modules/@appland/appmap/src/cli.js:31:28)
stderr:     at Module._compile (internal/modules/cjs/loader.js:759:30)
stderr:     at Object.Module._extensions..js (internal/modules/cjs/loader.js:770:10)
stderr:     at Module.load (internal/modules/cjs/loader.js:628:32)
/Users/ptrdvrk/.rbenv/versions/2.7.2/bin/bundle:23:in `load'
/Users/ptrdvrk/.rbenv/versions/2.7.2/bin/bundle:23:in `<main>'
Tasks: TOP => appmap:swagger
(See full trace by running task with --trace)

Reproduce the failure with bundle exec rake appmap:swagger, then inspect node_modules/@appland/appmap/src/agentInstaller/javaAgentInstaller.js around line 160 and the CLI entry point mentioned in the trace. Done means the Swagger task loads and runs successfully under Node 12 without an unsupported syntax error.