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Custom metadata implementation #62

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With the third argument FNMetaImpl of Object.extend the constructor of a metadata class can be specified. Instances of that class will be used to represent metadata for the newly created class and for any subclass created from it:

sap.ui.base.Object.extend(sClassName, oClassInfo?, FNMetaImpl?) : function

With the changes of the pull request, it possible to set this metadata class with jsdoc or decorators :

Typescript

import UI5Object from "sap/ui/base/Object"
/** @metadata some.namespace.CustomMetadata */
class TestClass extends UI5Object {
   // implementation
}

Result

sap.ui.define(["some/namespace/CustomMetadata", "sap/ui/base/Object"], function(MetadataObject, Object) {
  const TestClass = UI5Object.extend("some.namespace.TestClass", {
    // implementation
  }, MetadataObject);
  return TestClass;
}

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