Given type Mapping = Record<'success' | 'error', React.ReactNode>.
How do I get the typescript.Type using the compiler API?
The symbol of Mapping has two properties as expected but each property symbol does not have a type.
In { success: React.ReactNode, error: React.ReactNode } you could get the type for each property by using checker.getTypeOfSymbolAtLocation(symbol, symbol.declarations[0]) but this doesn
t seem to work for mapped types
This works when providing either the name or type node of the type alias for the node argument of TypeChecker#getTypeOfSymbolAtLocation(symbol, node):
const mappingDec = sourceFile.statements[0] as ts.TypeAliasDeclaration;
const mappingType = typeChecker.getTypeAtLocation(mappingDec.name);
// then example use...
for (const prop of mappingType.getProperties()) {
const name = prop.getName();
const type = typeChecker.getTypeOfSymbolAtLocation(prop, mappingDec.name)
}