Function initialize

packages/@ember/object/core.ts:72–172

(obj: CoreObject, properties?: unknown)

}

function initialize(obj: CoreObject, properties?: unknown) {
  let m = meta(obj);

  if (properties !== undefined) {
    assert(
      'EmberObject.create only accepts objects.',
      typeof properties === 'object' && properties !== null
    );

    assert(
      'EmberObject.create no longer supports mixing in other ' +
        'definitions, use .extend & .create separately instead.',
      !(properties instanceof Mixin)
    );

    let concatenatedProperties = obj.concatenatedProperties;
    let mergedProperties = obj.mergedProperties;

    let keyNames = Object.keys(properties);

    for (let keyName of keyNames) {
      // SAFETY: this cast as a Record is safe because all object types can be
      // indexed in JS, and we explicitly type it as returning `unknown`, so the
      // result *must* be checked below.
      let value: unknown = (properties as Record<string, unknown>)[keyName];

      assert(
        'EmberObject.create no longer supports defining computed ' +
          'properties. Define computed properties using extend() or reopen() ' +
          'before calling create().',
        !isClassicDecorator(value)
      );
      assert(
        'EmberObject.create no longer supports defining methods that call _super.',
        !(typeof value === 'function' && value.toString().indexOf('._super') !== -1)
      );
      assert(
        '`actions` must be provided at extend time, not at create time, ' +
          'when Ember.ActionHandler is used (i.e. views, controllers & routes).',
        !(keyName === 'actions' && ActionHandler.detect(obj))
      );

      let possibleDesc = descriptorForProperty(obj, keyName, m);
      let isDescriptor = possibleDesc !== undefined;

      if (!isDescriptor) {
        if (
          concatenatedProperties !== undefined &&
          concatenatedProperties.length > 0 &&
          concatenatedProperties.includes(keyName)
        ) {
          let baseValue = (obj as any)[keyName];
          if (baseValue) {
            value = makeArray(baseValue).concat(value);
          } else {
            value = makeArray(value);
          }
        }