Svelte compiler parse/walk type errors

[nvlang]

Describe the bug

Looking at the Svelte compiler docs, I'd expect the following to work just fine:

import { parse, walk } from "svelte/compiler";

const ast = parse("content");

// `walk(ast, {` doesn't fare much better either
walk(ast.html, {
    enter: (node) => {
        if (node.type === "Text") {
            this.skip();
        }
    },
    leave: () => {},
});

However, tsc throws a bunch of type errors (see below).

Reproduction

https://github.com/nvlang/svelte-bug

Logs

index.ts:6:6 - error TS2345: Argument of type 'TemplateNode' is not assignable to parameter of type 'Node'.
  Type 'Text' is not assignable to type 'Node'.
    Type 'Text' is missing the following properties from type 'Property': key, value, kind, method, and 2 more.

6 walk(ast.html, {
       ~~~~~~~~

index.ts:8:13 - error TS2367: This comparison appears to be unintentional because the types '"CatchClause" | "ClassBody" | "Identifier" | "Literal" | "MethodDefinition" | "PrivateIdentifier" | "Program" | "Property" | "PropertyDefinition" | "SpreadElement" | "Super" | ... 59 more ... | "VariableDeclaration"' and '"Text"' have no overlap.

8         if (node.type === "Text") {
              ~~~~~~~~~~~~~~~~~~~~

index.ts:9:13 - error TS2532: Object is possibly 'undefined'.

9             this.skip();
              ~~~~


Found 3 errors in the same file, starting at: index.ts:6

System Info

System:
  OS: macOS 14.3.1
  CPU: ...
  Memory: ...
  Shell: 5.9 - /bin/zsh
Binaries:
  Node: 21.7.0 - /usr/local/bin/node
  Yarn: 1.22.21 - /usr/local/bin/yarn
  npm: 10.5.0 - /usr/local/bin/npm
  pnpm: 8.15.4 - ~/Library/pnpm/pnpm
Browsers:
  Brave Browser: 120.1.61.109
  Chrome: 122.0.6261.112
  Edge: 122.0.2365.80
  Safari: 17.3.1
npmPackages:
  svelte: ^4.2.7 => 4.2.12

Severity

annoyance