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User-env-compile was a Heroku Labs feature that added experimental support for having an app’s config vars be present in the environment during slug compilation.
Features added through Heroku Labs are experimental and subject to change.
user-env-compile has been deprecated and replaced by the ENV_DIR argument to buildpack compile scripts. Buildpacks maintained by Heroku have been updated to use this new argument by default to export the app’s the environment as needed during builds. Maintainers of 3rd party buildpacks in use by apps with
user-env-compile enabled have been notified to make updates for this change.