Looking at the AST [0], this doesn't seem to be the case. Since Typescript already supports decorators in other contexts, it successfully parses everything and identifies the decorator to boot. Since you're working in a preprocessor context anyway, there's a number of options to make all of this work well together.
[0] https://ts-ast-viewer.com/#code/GYVwdgxgLglg9mABMOcAUBKRBvAU...