Class: Prefab::JavaScriptStub

Inherits:
Object
  • Object
show all
Defined in:
lib/prefab/javascript_stub.rb

Constant Summary collapse

LOG = 
Prefab::InternalLogger.new(self)

Instance Method Summary collapse

Constructor Details

#initialize(client = nil) ⇒ JavaScriptStub

Returns a new instance of JavaScriptStub.



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# File 'lib/prefab/javascript_stub.rb', line 7

def initialize(client = nil)
  @client = client || Prefab.instance
end

Instance Method Details

#bootstrap(context) ⇒ Object

Generate the JavaScript snippet to bootstrap the client SDK. This will include the configuration values that are permitted to be sent to the client SDK.

If the context provided to the client SDK is not the same as the context used to generate the configuration values, the client SDK will still generate a fetch to get the correct values for the context.

Any keys that could not be resolved will be logged as a warning to the console.



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# File 'lib/prefab/javascript_stub.rb', line 21

def bootstrap(context)
  configs, warnings = data(context)
  <<~JS
    window._prefabBootstrap = {
      configs: #{JSON.dump(configs)},
      context: #{JSON.dump(context)}
    }
    #{log_warnings(warnings)}
  JS
end

#generate_stub(context) ⇒ Object

Generate the JavaScript snippet to replace the client SDK. Use this to get ‘prefab.get` and `prefab.isEnabled` functions on the window object.

Only use this if you are not using the client SDK and do not need client-side context.

Any keys that could not be resolved will be logged as a warning to the console.



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# File 'lib/prefab/javascript_stub.rb', line 40

def generate_stub(context)
  configs, warnings = data(context)
  <<~JS
    window.prefab = window.prefab || {};
    window.prefab.config = #{JSON.dump(configs)};
    window.prefab.get = function(key) {
      return window.prefab.config[key];
    };
    window.prefab.isEnabled = function(key) {
      return window.prefab.config[key] === true;
    };
    #{log_warnings(warnings)}
  JS
end