There are two broad kinds of errors you can run into when generating: one kind is thrown earlier in the AutoRest pipeline and has to do with malformed swaggers (see our main docs for more information). The other kind is thrown by the Typescript generator itself.
The general AutoRest errors are thrown like this
FATAL: Error: Enum types of 'object' and format 'undefined' are not supported. Correct your input (HdiNodeTypes).
Error: Plugin modelerfour reported failure.
While the Typescript generator throws Typescript errors, such as:
ERROR: [main.Process:52] Typescript generator raised an exception
Traceback (most recent call last):
...
Unexpected value type: FakeValueType
Error: Plugin codegen reported failure.
Both of these issues should give you enough information to fix the error. If not, please let us know in either the main repo, or in the Typescript repo. Also let us know if you believe there are erroneous errors being thrown.
Our main docs show you how to pass in flags (--verbose / --debug) to get more debugging logs for your AutoRest calls.
If you'd like to actually debug through our code, you need to first clone the v6 branch of our repo, then include flag --typescript.debugger on our command line. You should now be able to step through the Typescript generator's code base.