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Function derefLayers

derefLayers(layers: LayerWithRef[]): LayerSpecification[]
The input is not modified. The output may contain references to portions of the input.
Parameters
- layers: LayerWithRef[]
  array of layers, some of which may contain ref properties whose value is the id of another property
Returns LayerSpecification[]
a new array where such layers have been augmented with the 'type', 'source', etc. properties from the parent layer, and the ref property has been removed.

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