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Seems to break with latest ember-cli-typescript

See original GitHub issue

I’m in the progress of trying embroider with our app.

Seems like something is breaking in regards to the latest TS version (via ember-cli-typescript):

unable to resolve babel plugin @babel/plugin-proposal-optional-chaining from

- broccoliBuilderErrorStack: Error: unable to resolve babel plugin @babel/plugin-proposal-optional-chaining from /tmp/embroider/13b7f6/project
    at PortableBabelConfig.resolveBabelPlugin (/path/to/project/node_modules/@embroider/core/src/portable-babel-config.js:74:27)
    at PortableBabelConfig.makePortable (/path/to/project/node_modules/@embroider/core/src/portable-babel-config.js:22:29)
    at /path/to/project/node_modules/@embroider/core/src/portable-plugin-config.js:64:55

The only usage of the babel plugin from our yarn.lock:

ember-cli-typescript@^3.1.1:
  version "3.1.1"
  resolved "https://registry.yarnpkg.com/ember-cli-typescript/-/ember-cli-typescript-3.1.1.tgz#a5a12ebf915e43ded7bf6bb460ecea4b67b0d95b"
  integrity sha512-HCjM5EZ29Yh94Jy/M2+MVkS9LdtOoGYtYLIcZ4F7umJaRJM67ku/xCyN/2r+uTeYTNdpJN9+HWx30a6yyAbfRA==
  dependencies:
    "@babel/plugin-proposal-nullish-coalescing-operator" "^7.4.4"
    "@babel/plugin-proposal-optional-chaining" "^7.6.0"
    "@babel/plugin-transform-typescript" "~7.7.0"

e-c-ts is adding the babel plugins like this:

https://github.com/typed-ember/ember-cli-typescript/blob/39e3b7f2f9cec078b69e732db15da4471af392c4/ts/addon.ts#L84

So maybe the issue is in ember-cli-babel-plugin-helpers adding the plugin in a way that embroider isn’t supporting: https://github.com/dfreeman/ember-cli-babel-plugin-helpers/blob/master/src/index.ts#L77