Function isForInVariableForNumericPropertyNames

test/fixtures/snapshot/typescript.js:75200–75220

* Return true if given node is an expression consisting of an identifier (possibly parenthesized) * that references a for-in variable for an object with numeric property names.

(expr)

         * that references a for-in variable for an object with numeric property names.
         */
        function isForInVariableForNumericPropertyNames(expr) {
            var e = ts.skipParentheses(expr);
            if (e.kind === 79 /* SyntaxKind.Identifier */) {
                var symbol = getResolvedSymbol(e);
                if (symbol.flags & 3 /* SymbolFlags.Variable */) {
                    var child = expr;
                    var node = expr.parent;
                    while (node) {
                        if (node.kind === 243 /* SyntaxKind.ForInStatement */ &&
                            child === node.statement &&
                            getForInVariableSymbol(node) === symbol &&
                            hasNumericPropertyNames(getTypeOfExpression(node.expression))) {
                            return true;
                        }
                        child = node;
                        node = node.parent;
                    }
                }
            }
            return false;
        }
        function checkIndexedAccess(node, checkMode) {
            return node.flags & 32 /* NodeFlags.OptionalChain */ ? checkElementAccessChain(node, checkMode) :
                checkElementAccessExpression(node, checkNonNullExpression(node.expression), checkMode);