Function checkNestedBlockScopedBinding

test/fixtures/snapshot/typescript.js:71819–71871

(node, symbol)

            return ts.findAncestor(node, function (n) { return (!n || ts.nodeStartsNewLexicalEnvironment(n)) ? "quit" : ts.isIterationStatement(n, /*lookInLabeledStatements*/ false); });
        }
        function checkNestedBlockScopedBinding(node, symbol) {
            if (languageVersion >= 2 /* ScriptTarget.ES2015 */ ||
                (symbol.flags & (2 /* SymbolFlags.BlockScopedVariable */ | 32 /* SymbolFlags.Class */)) === 0 ||
                !symbol.valueDeclaration ||
                ts.isSourceFile(symbol.valueDeclaration) ||
                symbol.valueDeclaration.parent.kind === 292 /* SyntaxKind.CatchClause */) {
                return;
            }
            // 1. walk from the use site up to the declaration and check
            // if there is anything function like between declaration and use-site (is binding/class is captured in function).
            // 2. walk from the declaration up to the boundary of lexical environment and check
            // if there is an iteration statement in between declaration and boundary (is binding/class declared inside iteration statement)
            var container = ts.getEnclosingBlockScopeContainer(symbol.valueDeclaration);
            var isCaptured = isInsideFunctionOrInstancePropertyInitializer(node, container);
            var enclosingIterationStatement = getEnclosingIterationStatement(container);
            if (enclosingIterationStatement) {
                if (isCaptured) {
                    // mark iteration statement as containing block-scoped binding captured in some function
                    var capturesBlockScopeBindingInLoopBody = true;
                    if (ts.isForStatement(container)) {
                        var varDeclList = ts.getAncestor(symbol.valueDeclaration, 255 /* SyntaxKind.VariableDeclarationList */);
                        if (varDeclList && varDeclList.parent === container) {
                            var part = getPartOfForStatementContainingNode(node.parent, container);
                            if (part) {
                                var links = getNodeLinks(part);
                                links.flags |= 131072 /* NodeCheckFlags.ContainsCapturedBlockScopeBinding */;
                                var capturedBindings = links.capturedBlockScopeBindings || (links.capturedBlockScopeBindings = []);
                                ts.pushIfUnique(capturedBindings, symbol);
                                if (part === container.initializer) {
                                    capturesBlockScopeBindingInLoopBody = false; // Initializer is outside of loop body
                                }
                            }
                        }
                    }
                    if (capturesBlockScopeBindingInLoopBody) {
                        getNodeLinks(enclosingIterationStatement).flags |= 65536 /* NodeCheckFlags.LoopWithCapturedBlockScopedBinding */;
                    }
                }
                // mark variables that are declared in loop initializer and reassigned inside the body of ForStatement.
                // if body of ForStatement will be converted to function then we'll need a extra machinery to propagate reassigned values back.
                if (ts.isForStatement(container)) {
                    var varDeclList = ts.getAncestor(symbol.valueDeclaration, 255 /* SyntaxKind.VariableDeclarationList */);
                    if (varDeclList && varDeclList.parent === container && isAssignedInBodyOfForStatement(node, container)) {
                        getNodeLinks(symbol.valueDeclaration).flags |= 4194304 /* NodeCheckFlags.NeedsLoopOutParameter */;
                    }
                }
                // set 'declared inside loop' bit on the block-scoped binding
                getNodeLinks(symbol.valueDeclaration).flags |= 524288 /* NodeCheckFlags.BlockScopedBindingInLoop */;
            }
            if (isCaptured) {
                getNodeLinks(symbol.valueDeclaration).flags |= 262144 /* NodeCheckFlags.CapturedBlockScopedBinding */;
            }
        }
        function isBindingCapturedByNode(node, decl) {
            var links = getNodeLinks(node);
            return !!links && ts.contains(links.capturedBlockScopeBindings, getSymbolOfNode(decl));