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Issues mixing babel versions

See original GitHub issue

The app is depending on 7.x \w decorators, but something is going sideways. Here is a stack trace (although I will debug more)

< Requires Babel "^7.0.0-0", but was loaded with "6.26.3". If you are sure you have a compatible version of @babel/core, it is likely that something in your build process is loading the wrong version. Inspect the stack trace of this error to look for the first entry that doesn't mention "@babel/core" or "babel-core" to see what is
 calling Babel.
<     at throwVersionError (/Users/spenner/l/pemberly-example-web_trunk/node_modules/@babel/helper-plugin-utils/lib/index.js:65:11)
<     at Object.assertVersion (/Users/spenner/l/pemberly-example-web_trunk/node_modules/@babel/helper-plugin-utils/lib/index.js:13:11)
<     at _default (/Users/spenner/l/pemberly-example-web_trunk/node_modules/@babel/plugin-proposal-decorators/lib/index.js:43:7)
<     at /Users/spenner/l/pemberly-example-web_trunk/node_modules/@babel/helper-plugin-utils/lib/index.js:19:12
<     at Function.memoisePluginContainer (/Users/spenner/src/embroider-build/embroider/node_modules/babel-core/lib/transformation/file/options/option-manager.js:113:13)
<     at Function.normalisePlugin (/Users/spenner/src/embroider-build/embroider/node_modules/babel-core/lib/transformation/file/options/option-manager.js:146:32)
<     at /Users/spenner/src/embroider-build/embroider/node_modules/babel-core/lib/transformation/file/options/option-manager.js:184:30
<     at Array.map (<anonymous>)
<     at Function.normalisePlugins (/Users/spenner/src/embroider-build/embroider/node_modules/babel-core/lib/transformation/file/options/option-manager.js:158:20)
<     at OptionManager.mergeOptions (/Users/spenner/src/embroider-build/embroider/node_modules/babel-core/lib/transformation/file/options/option-manager.js:234:36)
<     at OptionManager.init (/Users/spenner/src/embroider-build/embroider/node_modules/babel-core/lib/transformation/file/options/option-manager.js:368:12)
<     at File.initOptions (/Users/spenner/src/embroider-build/embroider/node_modules/babel-core/lib/transformation/file/index.js:212:65)
<     at new File (/Users/spenner/src/embroider-build/embroider/node_modules/babel-core/lib/transformation/file/index.js:135:24)
<     at Pipeline.transform (/Users/spenner/src/embroider-build/embroider/node_modules/babel-core/lib/transformation/pipeline.js:46:16)
<     at transpile (/Users/spenner/src/embroider-build/embroider/node_modules/babel-loader/lib/index.js:50:20)
<     at Object.module.exports (/Users/spenner/src/embroider-build/embroider/node_modules/babel-loader/lib/index.js:173:20)
< ERROR in ./assets/test.js