Introducing modified TypeScript in an exis ng framework to im - prove error handling

Error messages in compilers is a topic that is often overlooked. The quality of the messages can have a big impact on development time and ease of learning. Another method used to speed up development is to build a domainspecific language (DSL). This thesis migrates an existing framework to use TypeScript in order to speed up development time with compile-time error handling. Alternative methods for implementing a DSL are evaluated based on how they affect the ability to generate good error messages. This is done using a proposed list of six usability heuristics for error messages. They are also used to perform heuristic evaluation on the error messages in the TypeScript compiler. This showed that it struggled with syntax errors but had semantic error messages with low amount of usability problems. Finally, a method for implementing a DSL and presenting its error messages is suggested. The evaluation of said method showed promise despite the existence of usability problems.