Custom platform packages of V8Js for Heroku.
See Heroku documentation for details on what this is all about.
In order to use V8Js on Heroku you can (meanwhile) stick with the normal PHP buildpack.
You just have to set the HEROKU_PHP_PLATFORM_REPOSITORIES environment variable on your app,
depending on the stack you've chosen.
This will cause Heroku to fetch V8Js from "heroku-v8js" S3 bucket which is managed by @stesie (current maintainer of V8Js).
Within Heroku portal, choose your app and go to the Settings tab. In the section labeled Info you'll see which stack is currently activated, this should be either heroku-16 or cedar-14.
Then click the button Reveal Config Vars from the Config Variables section, add a new record with key HEROKU_PHP_PLATFORM_REPOSITORIES and
- for heroku-16 stack: https://heroku-v8js.s3.amazonaws.com/dist-heroku-16-stable/packages.json as value
- for cedar-14 stack: https://heroku-v8js.s3.amazonaws.com/dist-cedar-14-stable/packages.json
To find out which stack is currently active, use heroku apps:info.
Then if you're using the heroku-16 stack:
heroku config:set HEROKU_PHP_PLATFORM_REPOSITORIES="https://heroku-v8js.s3.amazonaws.com/dist-heroku-16-stable/packages.json"
Otherwise on cedar-14 type this:
heroku config:set HEROKU_PHP_PLATFORM_REPOSITORIES="https://heroku-v8js.s3.amazonaws.com/dist-cedar-14-stable/packages.json"