Function parseParameterWorker

test/fixtures/snapshot/typescript.js:33482–33511

(inOuterAwaitContext, allowAmbiguity)

            return parseParameterWorker(inOuterAwaitContext, /*allowAmbiguity*/ false);
        }
        function parseParameterWorker(inOuterAwaitContext, allowAmbiguity) {
            if (allowAmbiguity === void 0) { allowAmbiguity = true; }
            var pos = getNodePos();
            var hasJSDoc = hasPrecedingJSDocComment();
            // FormalParameter [Yield,Await]:
            //      BindingElement[?Yield,?Await]
            // Decorators are parsed in the outer [Await] context, the rest of the parameter is parsed in the function's [Await] context.
            var decorators = inOuterAwaitContext ? doInAwaitContext(parseDecorators) : parseDecorators();
            if (token() === 108 /* SyntaxKind.ThisKeyword */) {
                var node_1 = factory.createParameterDeclaration(decorators, 
                /*modifiers*/ undefined, 
                /*dotDotDotToken*/ undefined, createIdentifier(/*isIdentifier*/ true), 
                /*questionToken*/ undefined, parseTypeAnnotation(), 
                /*initializer*/ undefined);
                if (decorators) {
                    parseErrorAtRange(decorators[0], ts.Diagnostics.Decorators_may_not_be_applied_to_this_parameters);
                }
                return withJSDoc(finishNode(node_1, pos), hasJSDoc);
            }
            var savedTopLevel = topLevel;
            topLevel = false;
            var modifiers = parseModifiers();
            var dotDotDotToken = parseOptionalToken(25 /* SyntaxKind.DotDotDotToken */);
            if (!allowAmbiguity && !isParameterNameStart()) {
                return undefined;
            }
            var node = withJSDoc(finishNode(factory.createParameterDeclaration(decorators, modifiers, dotDotDotToken, parseNameOfParameter(modifiers), parseOptionalToken(57 /* SyntaxKind.QuestionToken */), parseTypeAnnotation(), parseInitializer()), pos), hasJSDoc);
            topLevel = savedTopLevel;
            return node;
        }
        function parseReturnType(returnToken, isType) {
            if (shouldParseReturnType(returnToken, isType)) {
                return allowConditionalTypesAnd(parseTypeOrTypePredicate);