Native printer panics when printing JSDoc AST nodes (emitJSDocNode not implemented) #65429

🔎 Search Terms

emitJSDocNode, "not implemented", printer JSDoc, printNode JSDoc, JSDoc AST node panic

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about this. It reproduces on current main of the native (Go) compiler: Printer.emitJSDocNode is still a stub.

⏯ Playground Link

N/A. This is about the native Go printer and the TypeScript 7 JS API (api.printer.printNode), which the Playground does not exercise.

💻 Code

var factory ast.NodeFactory
doc := factory.NewJSDoc(
	factory.NewNodeList([]*ast.Node{factory.NewJSDocText([]string{"This is a function description"})}),
	nil, /*tags*/
)
printer.NewPrinter(
	printer.PrinterOptions{NewLine: core.NewLineKindLF},
	printer.PrintHandlers{},
	nil,
).Emit(doc, nil) // panics: not implemented

The same panic is reachable from the JS API via api.printer.printNode(jsdocNode).

🙁 Actual behavior

The printer dispatches JSDoc node kinds to Printer.emitJSDocNode in tsc/internal/printer/printer.go, which is currently:

func (p *Printer) emitJSDocNode(node *ast.Node) {
	// !!!
	panic("not implemented")
}

so printing a JSDoc node panics.

🙂 Expected behavior

The printer should emit a formatted JSDoc comment, including its text and tags, like it does for other node kinds.

Additional information about the issue

I searched open and closed issues and PRs for this and found no other report or PR that implements JSDoc node emission. Open PR #64500 (synthetic comments and emit flags in the API) is related but does not implement emitJSDocNode.

This replaces #65057, which was closed because I did not use the issue template. Sorry about that, and thanks for pointing it out. A focused fix PR will be linked here.