[BUG] Custom error imports are erased at compilation causing runtime errors

[FredTreg]

Describe the bug
When using the construct Assert<type, ThrowError<MyInputError>> the import { MyInputError } from 'somewhere' statement gets removed at compilation time.

Generated code will fail with MyInputError is not defined at runtime.

Playground link
Compare this playground and this playground

In the first playground, you can see the import being removed, in the second playground it remains because the InputError class is used directly at line 4: this is the current workaround I found to make it work.

Expected behavior
One can use custom error classes when using Assert without having to create fake statements.

Additional context

• ts-runtime-checks: 0.4.1
• typescript: 5.2.2 (ESM)

[GoogleFeud]

This issue turned out to be more difficult than I thought, it will be resolved, but maybe in the next patch. There are two ways to fix this error:

Turn on the verbatimModuleSyntax typescript options (5.0 and up, only works with CommonJS)

Or using require directly:

import { MyError } = require("./path");