At the time of writing, I believe that Heroku installed only the production dependencies by default, ignoring the development dependencies under devDependencies. npm install --only=dev had to be added for the project to build correctly. I think this default behavior has been changed so it may no longer be needed!
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At the time of writing, I believe that Heroku installed only the production dependencies by default, ignoring the development dependencies under devDependencies.
npm install --only=devhad to be added for the project to build correctly. I think this default behavior has been changed so it may no longer be needed!