Try Go to source definition
This command will try to jump to the original JavaScript implementation of a function/symbol, even for code under node_modules.
JavaScript is a very dynamic language though, so we can’t figure out the source location in every case. If you aren’t getting results for a common library, please file an issue against TypeScript so we can investigate adding support
For faster and more accurate results, libraries can bundle declaration maps that map from .d.ts files back to source .ts (or .js) files. However many libraries currently do not include these