in compiler/src/transform/expand-generics.ts [136:160]
function expandType (name: TypeName, params: ValueOf[]): TypeName {
if (name.namespace === '_builtins') {
return name
}
const type = getType(name)
switch (type.kind) {
case 'enum':
// Nothing to do
return addIfNotSeen(type.name, () => type)
case 'type_alias':
return expandTypeAlias(type, params)
case 'request':
return expandRequest(type, params)
case 'response':
return expandResponse(type, params)
case 'interface':
return expandInterface(type, params)
}
}