In the ESM transition, this.sources was initialized as an empty array. This fixed a compiler error (class properties must be defined in the constructor) but caused a bug with applications expecting the sources to be null/undefined if setSources was never called. This change represents the original behavior, which will process filters in saveInternal if the sources array is not defined.
In the ESM transition,
this.sourceswas initialized as an empty array. This fixed a compiler error (class properties must be defined in the constructor) but caused a bug with applications expecting the sources to be null/undefined ifsetSourceswas never called. This change represents the original behavior, which will process filters insaveInternalif the sources array is not defined.