Gets the export symbol of the symbol if its a local symbol with a corresponding export symbol. Otherwise returns the current symbol.

The following is from the compiler API documentation:

For example, at export type T = number;: - getSymbolAtLocation at the location T will return the exported symbol for T. - But the result of getSymbolsInScope will contain the local symbol for T, not the exported symbol. - Calling getExportSymbol on that local symbol will return the exported symbol.