Change manifest path dynamically (both rails and npm package)

[h0jeZvgoxFepBQ2C]

Hi,

is there any way to change the manifest.json path dynamically (based on branch name and Rails.env)?
We have this, but this only works for the ruby side, not the npm side as it seems:

::BRANCH_NAME = `git rev-parse --abbrev-ref HEAD | sed 's/\//_/g'`.chomp.parameterize

class Shakapacker::Configuration
  # old_public_output_path = instance_method(:public_output_path)

  # define_method(:public_output_path) do
  #   public_path.join(fetch(:public_output_path), File.read(Rails.root.join(".asset-version")).strip) +  "/"
  # end
  old_public_manifest_path = instance_method(:public_manifest_path)

  define_method(:public_manifest_path) do
    # puts "Running node with " + ENV["NODE_ENV"].to_s
    @webpack_config_public_manifest_path ||= Rails.root.join("config", "asset-manifests", Rails.env, ::BRANCH_NAME, "shakapacker-manifest.json")
  end

  old_manifest_path = instance_method(:manifest_path)

  define_method(:manifest_path) do
    # puts "Running node with " + ENV["NODE_ENV"].to_s
    @webpack_config_manifest_path ||= Rails.root.join("config", "asset-manifests", Rails.env, ::BRANCH_NAME, "shakapacker-manifest.json")
  end
end

Is there any better way? Since only the config-yml is loaded, but there is no other way I saw? afaik?

Thank you!

[tomdracz]

By default, you can set manifest path per environment in the shakapacker.yml

shakapacker/lib/install/config/shakapacker.yml

Lines 29 to 30 in f902e18

	# Location for manifest.json, defaults to {public_output_path}/manifest.json if unset
	# manifest_path: public/packs/manifest.json

- Only that is supported easily.

If you want to amend the output path for NPM package further, you would have to play around with the webpack config, example below how to amend the manifest output path:

const { generateWebpackConfig } = require('shakapacker');
const path = require('path');

const customConfig = {
  resolve: {
    extensions: ['.css', 'js'],
  },
};

const generatedConfig = generateWebpackConfig(customConfig);

// Generate manifest JSON path here
const manifestPath = path.resolve(
  __dirname,
  '../../public/packs/other_manifest.json'
);

generatedConfig.plugins.forEach((plugin) => {
  if (plugin.constructor.name === 'WebpackAssetsManifest') {
    plugin.options.output = manifestPath;
  }
});

module.exports = generatedConfig;

[h0jeZvgoxFepBQ2C]

Thanks this works fine so far!