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When the Cedar stack was first released, it ushered in a new era of polyglot development by enabling developers to run programs on Heroku, not just in Ruby, but also with a multitude of different languages. Instead of being designed with a set of popular languages in mind, Cedar was built to be language agnostic, with a buildpack used as a script to set up the run time for that language or framework on Heroku. Heroku provides a number of supported, open-source buildpacks, as shown in the examples in previous chapters. For a complete list, see https://devcenter.heroku.com/articles/buildpacks#default-buildpacks.
However, Heroku’s creators realized that developers of less mainstream or esoteric languages would also want their programs to leverage Heroku’s rapid scalability and increased developer productivity. Obviously, developing supported buildpacks in every language that exists is not a very scalable plan (or a good use of Heroku’s resources). Therefore, they instead built in the capability ...