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ReferenceType has undefined type

See original GitHub issue

I get the an undefined error trying to parse MyType.

import { View, ViewStyle, StyleProp } from 'react-native';
export type MyType = StyleProp<ViewStyle>

TypeError: Cannot read property 'getId' of undefined
    at ReferenceType.getId (/Users/awinograd/programming/ts-json-schema-generator/dist/src/Type/ReferenceType.js:12:26)                                                                                    
    at (.types.map (/Users/awinograd/programming/ts-json-schema-generator/dist/src/Type/UnionType.js:11:25)                                                                                                
    at Array.map (<anonymous>)
    at UnionType.getId (/Users/awinograd/programming/ts-json-schema-generator/dist/src/Type/UnionType.js:10:33)                                                                                            
    at ids.join.<.context.getArguments.map (/Users/awinograd/programming/ts-json-schema-generator/dist/src/CircularReferenceNodeParser.js:33:78)                                                           
    at Array.map (<anonymous>)
    at CircularReferenceNodeParser.createCacheKey (/Users/awinograd/programming/ts-json-schema-generator/dist/src/CircularReferenceNodeParser.js:33:61)                                                    
    at CircularReferenceNodeParser.createType (/Users/awinograd/programming/ts-json-schema-generator/dist/src/CircularReferenceNodeParser.js:13:26)                                                        
    at ChainNodeParser.createType (/Users/awinograd/programming/ts-json-schema-generator/dist/src/ChainNodeParser.js:17:50)                                                                                
    at ExpressionWithTypeArgumentsNodeParser.createType (/Users/awinograd/programming/ts-json-schema-generator/dist/src/NodeParser/ExpressionWithTypeArgumentsNodeParser.js:23:41)

So far, I’ve figured out that getId is called in createType before the returned value is actually set on the reference on the same line in CircularReferenceNodeParser

https://github.com/vega/ts-json-schema-generator/blob/c0f13a0c8aa01a4bba22c0e46de33585677a39b0/src/CircularReferenceNodeParser.ts#L26