When using package managers like pnpm or yarn v3 with the pnpm linker, the current check for methods that come from this library doesn't work. The reason is that path.resolve(signature.declaration.getSourceFile().fileName is a path like node_modules/typescript-is/index.d.ts, but path.resolve(path.join(__dirname, '..', '..', 'index.d.ts')) looks like this node_modules/.store/typescript-is-virtual-6354fcdb88/node_modules/typescript-is/index.d.ts. The former folder is a symlink to the latter.
Using fs.realpathSync we can resolve the symlinked path to the real one and make sure the transformer works in these contexts.
I threw in some caching for the lookup via PartialVisitorContext.canonicalPaths, if this isn't desired, it also works using fs directly.
When using package managers like
pnpmoryarn v3with thepnpmlinker, the current check for methods that come from this library doesn't work. The reason is thatpath.resolve(signature.declaration.getSourceFile().fileNameis a path likenode_modules/typescript-is/index.d.ts, butpath.resolve(path.join(__dirname, '..', '..', 'index.d.ts'))looks like thisnode_modules/.store/typescript-is-virtual-6354fcdb88/node_modules/typescript-is/index.d.ts. The former folder is a symlink to the latter.Using
fs.realpathSyncwe can resolve the symlinked path to the real one and make sure the transformer works in these contexts.I threw in some caching for the lookup via
PartialVisitorContext.canonicalPaths, if this isn't desired, it also works usingfsdirectly.