Function useOuterVariableScopeInParameter

test/fixtures/snapshot/typescript.js:49575–49633

(result, location, lastLocation)

            }
        }
        function useOuterVariableScopeInParameter(result, location, lastLocation) {
            var target = ts.getEmitScriptTarget(compilerOptions);
            var functionLocation = location;
            if (ts.isParameter(lastLocation)
                && functionLocation.body
                && result.valueDeclaration
                && result.valueDeclaration.pos >= functionLocation.body.pos
                && result.valueDeclaration.end <= functionLocation.body.end) {
                // check for several cases where we introduce temporaries that require moving the name/initializer of the parameter to the body
                // - static field in a class expression
                // - optional chaining pre-es2020
                // - nullish coalesce pre-es2020
                // - spread assignment in binding pattern pre-es2017
                if (target >= 2 /* ScriptTarget.ES2015 */) {
                    var links = getNodeLinks(functionLocation);
                    if (links.declarationRequiresScopeChange === undefined) {
                        links.declarationRequiresScopeChange = ts.forEach(functionLocation.parameters, requiresScopeChange) || false;
                    }
                    return !links.declarationRequiresScopeChange;
                }
            }
            return false;
            function requiresScopeChange(node) {
                return requiresScopeChangeWorker(node.name)
                    || !!node.initializer && requiresScopeChangeWorker(node.initializer);
            }
            function requiresScopeChangeWorker(node) {
                switch (node.kind) {
                    case 214 /* SyntaxKind.ArrowFunction */:
                    case 213 /* SyntaxKind.FunctionExpression */:
                    case 256 /* SyntaxKind.FunctionDeclaration */:
                    case 171 /* SyntaxKind.Constructor */:
                        // do not descend into these
                        return false;
                    case 169 /* SyntaxKind.MethodDeclaration */:
                    case 172 /* SyntaxKind.GetAccessor */:
                    case 173 /* SyntaxKind.SetAccessor */:
                    case 296 /* SyntaxKind.PropertyAssignment */:
                        return requiresScopeChangeWorker(node.name);
                    case 167 /* SyntaxKind.PropertyDeclaration */:
                        // static properties in classes introduce temporary variables
                        if (ts.hasStaticModifier(node)) {
                            return target < 99 /* ScriptTarget.ESNext */ || !useDefineForClassFields;
                        }
                        return requiresScopeChangeWorker(node.name);
                    default:
                        // null coalesce and optional chain pre-es2020 produce temporary variables
                        if (ts.isNullishCoalesce(node) || ts.isOptionalChain(node)) {
                            return target < 7 /* ScriptTarget.ES2020 */;
                        }
                        if (ts.isBindingElement(node) && node.dotDotDotToken && ts.isObjectBindingPattern(node.parent)) {
                            return target < 4 /* ScriptTarget.ES2017 */;
                        }
                        if (ts.isTypeNode(node))
                            return false;
                        return ts.forEachChild(node, requiresScopeChangeWorker) || false;
                }
            }