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Heroku Ruby / Rails Cache Webpack + Yarn Between Deployments

I currently have a new ruby ​​/ rails application setup with webpacker. Each deployment in Heroku takes another 30+ seconds to reinstall yarn dependencies (performed yarn install).

remote:        [1/4] Resolving packages...
remote:        [2/4] Fetching packages...
remote:        info fsevents@1.1.3: The platform "linux" is incompatible with this module.
remote:        info "fsevents@1.1.3" is an optional dependency and failed compatibility check. Excluding it from installation.
remote:        [3/4] Linking dependencies...
remote:        warning "babel-loader@7.1.2" has incorrect peer dependency "babel-core@6 || 7 || ^7.0.0-alpha || ^7.0.0-beta || ^7.0.0-rc".
remote:        warning "babel-loader@7.1.2" has incorrect peer dependency "webpack@2 || 3".
remote:        warning "compression-webpack-plugin@1.1.2" has incorrect peer dependency "webpack@^2.0.0 || ^3.0.0".
remote:        warning "extract-text-webpack-plugin@3.0.2" has incorrect peer dependency "webpack@^3.1.0".
remote:        warning "file-loader@1.1.5" has incorrect peer dependency "webpack@^2.0.0 || ^3.0.0".
remote:        warning "postcss-cssnext@3.0.2" has incorrect peer dependency "caniuse-lite@^1.0.30000697".
remote:        warning "rails-erb-loader@5.2.1" has incorrect peer dependency "webpack@^2.0.0 || >= 3.0.0-rc.0 || ^3.0.0".
remote:        warning "sass-loader@6.0.6" has incorrect peer dependency "node-sass@^4.0.0".
remote:        warning "sass-loader@6.0.6" has incorrect peer dependency "webpack@^2.0.0 || >= 3.0.0-rc.0 || ^3.0.0".
remote:        warning "url-loader@0.6.2" has incorrect peer dependency "file-loader@*".
remote:        warning "webpack-manifest-plugin@1.3.2" has incorrect peer dependency "webpack@1 || 2 || 3".
remote:        warning "ajv-keywords@2.1.1" has incorrect peer dependency "ajv@^5.0.0".
remote:        warning "uglifyjs-webpack-plugin@0.4.6" has incorrect peer dependency "webpack@^1.9 || ^2 || ^2.1.0-beta || ^2.2.0-rc || ^3.0.0".
remote:        warning "babel-plugin-transform-vue-jsx@3.5.0" has incorrect peer dependency "babel-helper-vue-jsx-merge-props@^2.0.0".
remote:        warning "babel-plugin-transform-vue-jsx@3.5.0" has incorrect peer dependency "babel-plugin-syntax-jsx@^6.8.0".
remote:        warning "vue-loader@13.5.0" has incorrect peer dependency "css-loader@*".
remote:        warning "webpack-dev-server@2.9.7" has incorrect peer dependency "webpack@^2.2.0 || ^3.0.0".
remote:        warning "webpack-dev-middleware@1.12.2" has incorrect peer dependency "webpack@^1.0.0 || ^2.0.0 || ^3.0.0".
remote:        [4/4] Building fresh packages...
remote:        Done in 33.50s.
remote:        Webpacker is installed 🎉 🍰

I am currently using heroku/rubybuildpack on the stack heroku-16. Any easy way to make caching work the same as for bundler?

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Perhaps you can add a second nodejs buildpack in addition to the hero stack:

heroku buildpacks:add --index 1 heroku/nodejs

The nodejs buildpack node must support yarn caching as described here .

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