Method extractFunction

src/extraction/tree-sitter.ts:1517–1609

* Extract a function

(node: SyntaxNode, nameOverride?: string)

   * Extract a function
   */
  private extractFunction(node: SyntaxNode, nameOverride?: string): void {
    if (!this.extractor) return;

    // If the language provides getReceiverType and this function has a receiver
    // (e.g., Rust function_item inside an impl block), extract as method instead
    if (this.extractor.getReceiverType?.(node, this.source)) {
      this.extractMethod(node);
      return;
    }

    // nameOverride is supplied only for explicitly-named anonymous functions the
    // caller resolved itself (e.g. arrow values of exported-const object members
    // — SvelteKit actions). Inline-object arrows reached by the general walker
    // get no override, so they still fall through to the <anonymous> skip below.
    let name = nameOverride ?? extractName(node, this.source, this.extractor);
    // For arrow functions and function expressions assigned to variables,
    // resolve the name from the parent variable_declarator.
    // e.g. `export const useAuth = () => { ... }` — the arrow_function node
    // has no `name` field; the name lives on the variable_declarator.
    if (
      !nameOverride &&
      name === '<anonymous>' &&
      (node.type === 'arrow_function' || node.type === 'function_expression')
    ) {
      const parent = node.parent;
      if (parent?.type === 'variable_declarator') {
        const varName = getChildByField(parent, 'name');
        if (varName) {
          name = getNodeText(varName, this.source);
        }
      }
    }
    if (name === '<anonymous>') {
      // Don't emit a node for the anonymous wrapper itself, but still visit its
      // body: AMD/RequireJS and CommonJS module wrappers (`define([], function(){…})`,
      // `(function(){…})()`) hold named inner functions and calls that would
      // otherwise be lost — the dispatcher set skipChildren, so nothing else
      // descends into this subtree. (#528)
      const body = this.extractor.resolveBody?.(node, this.extractor.bodyField)
        ?? getChildByField(node, this.extractor.bodyField);
      if (body) {
        this.visitFunctionBody(body, '');
      }
      return;
    }

    // Check for misparse artifacts (e.g. C++ macros causing "namespace detail" functions)
    // Skip the node but still visit the body for calls and structural nodes
    if (this.extractor.isMisparsedFunction?.(name, node)) {
      const body = this.extractor.resolveBody?.(node, this.extractor.bodyField)
        ?? getChildByField(node, this.extractor.bodyField);
      if (body) {
        this.visitFunctionBody(body, '');
      }
      return;
    }

    const docstring = getPrecedingDocstring(node, this.source);