Mechanical shape extraction from a Lit 3 component source (.js/.ts).

Best-effort regex/scanner parsing — deliberately NOT a JavaScript parser. It recognizes the common Lit 3 declaration patterns and returns a plain JSON-able shape descriptor that Noizu.Tessera.FromLit.Generator turns into a tessera spec stub. Anything it cannot parse mechanically is surfaced in "warnings" — never silently dropped (a conversion tool that lies is worse than none).

Supported patterns:

• @customElement("tag") and customElements.define("tag", Class);
• @property({...}) / @state() decorated fields (multiline options, TS annotations, declare/accessor/visibility modifiers, literal defaults);
• static properties = {...} and static get properties() { return {...} } (option objects and name: Type shorthand, state: true entries);
• this.dispatchEvent(new CustomEvent("name", {detail: {...}, bubbles, composed})) and new Event("name") — detail key types are inferred from literal values, non-literal values become "any";
• <slot> / <slot name="..."> (unnamed slots become "default");
• static styles = css\...`(single, array, or getter form) — raw CSS text is captured;${...}` interpolation is flagged, not resolved.

Known limitations (warned, not guessed): computed defaults, custom converters / hasChanged, spread options, non-literal event names, interpolated styles, events constructed away from their dispatchEvent call, and templates nested inside ${...} interpolations.

Shape descriptor (string keys, JSON-encodable):

%{
  "source" => path | nil,
  "tag" => "my-element" | nil,
  "class_name" => "MyElement" | nil,
  "properties" => [
    %{"name" => "displayName", "kind" => "property" | "state" | "static",
      "type" => "string" | "integer" | "float" | "boolean" | "list" | "map" | "any",
      "source_type" => "String" | "number" | nil,
      "default" => literal | nil, "default_expression" => raw | nil,
      "attribute" => true | false | "custom-name", "reflect" => boolean}
  ],
  "events" => [
    %{"name" => "persona-select",
      "detail" => [%{"name" => "personaId", "type" => "string"}],
      "bubbles" => boolean, "composed" => boolean}
  ],
  "slots" => [%{"name" => "header"}],
  "styles" => ["raw css", ...],
  "warnings" => ["..."]
}