Returns a symbol for name.
If library is not a LibraryMirror or if name is a private identifier and library is null, throws an ArgumentError. If name is a private identifier, the symbol returned is with respect to library.
The following text is non-normative:
Using this method may result in larger output. If possible, use the const constructor of Symbol or symbol literals.
external static Symbol getSymbol(String name, [LibraryMirror library]);
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https://api.dart.dev/stable/2.5.0/dart-mirrors/MirrorSystem/getSymbol.html