Function findParentNode

packages/expr/src/autocomplete.ts:543–556

* Finds the parent of child node in the provided AST.

(child: AnyNode, ast: Expression)

 * Finds the parent of child node in the provided AST.
 */
function findParentNode(child: AnyNode, ast: Expression): AnyNode | undefined {
    let foundParent: AnyNode | undefined;

    walk.ancestor(ast, {
        [child.type]: (node: AcornNode, _state: undefined, ancestors: AnyNode[]) => {
            if (node.start === child.start && node.end === child.end) {
                // The parent is the second last ancestor in the stack (last one is the actual node)
                foundParent = ancestors[ancestors.length - 2];
            }
        },
    });

    return foundParent;
}

function isSupportedMemberProperty(node: Expression | PrivateIdentifier | Super) {
    return node.type === 'Identifier' || node.type === 'Literal';