Node formats node in canonical gofmt style and writes the result to dst.

The node type must be *ast.File, *printer.CommentedNode, []ast.Decl, []ast.Stmt, or assignment-compatible to ast.Expr, ast.Decl, ast.Spec, or ast.Stmt. Node does not modify node. Imports are not sorted for nodes representing partial source files (i.e., if the node is not an *ast.File or a *printer.CommentedNode not wrapping an *ast.File).

The function may return early (before the entire result is written) and return a formatting error, for instance due to an incorrect AST.