Function transformAsyncFunctionBody

test/fixtures/snapshot/typescript.js:96225–96296

(node)

            return false;
        }
        function transformAsyncFunctionBody(node) {
            resumeLexicalEnvironment();
            var original = ts.getOriginalNode(node, ts.isFunctionLike);
            var nodeType = original.type;
            var promiseConstructor = languageVersion < 2 /* ScriptTarget.ES2015 */ ? getPromiseConstructor(nodeType) : undefined;
            var isArrowFunction = node.kind === 214 /* SyntaxKind.ArrowFunction */;
            var hasLexicalArguments = (resolver.getNodeCheckFlags(node) & 8192 /* NodeCheckFlags.CaptureArguments */) !== 0;
            // An async function is emit as an outer function that calls an inner
            // generator function. To preserve lexical bindings, we pass the current
            // `this` and `arguments` objects to `__awaiter`. The generator function
            // passed to `__awaiter` is executed inside of the callback to the
            // promise constructor.
            var savedEnclosingFunctionParameterNames = enclosingFunctionParameterNames;
            enclosingFunctionParameterNames = new ts.Set();
            for (var _i = 0, _a = node.parameters; _i < _a.length; _i++) {
                var parameter = _a[_i];
                recordDeclarationName(parameter, enclosingFunctionParameterNames);
            }
            var savedCapturedSuperProperties = capturedSuperProperties;
            var savedHasSuperElementAccess = hasSuperElementAccess;
            if (!isArrowFunction) {
                capturedSuperProperties = new ts.Set();
                hasSuperElementAccess = false;
            }
            var result;
            if (!isArrowFunction) {
                var statements = [];
                var statementOffset = factory.copyPrologue(node.body.statements, statements, /*ensureUseStrict*/ false, visitor);
                statements.push(factory.createReturnStatement(emitHelpers().createAwaiterHelper(inHasLexicalThisContext(), hasLexicalArguments, promiseConstructor, transformAsyncFunctionBodyWorker(node.body, statementOffset))));
                ts.insertStatementsAfterStandardPrologue(statements, endLexicalEnvironment());
                // Minor optimization, emit `_super` helper to capture `super` access in an arrow.
                // This step isn't needed if we eventually transform this to ES5.
                var emitSuperHelpers = languageVersion >= 2 /* ScriptTarget.ES2015 */ && resolver.getNodeCheckFlags(node) & (4096 /* NodeCheckFlags.AsyncMethodWithSuperBinding */ | 2048 /* NodeCheckFlags.AsyncMethodWithSuper */);
                if (emitSuperHelpers) {
                    enableSubstitutionForAsyncMethodsWithSuper();
                    if (capturedSuperProperties.size) {
                        var variableStatement = createSuperAccessVariableStatement(factory, resolver, node, capturedSuperProperties);
                        substitutedSuperAccessors[ts.getNodeId(variableStatement)] = true;
                        ts.insertStatementsAfterStandardPrologue(statements, [variableStatement]);
                    }
                }
                var block = factory.createBlock(statements, /*multiLine*/ true);
                ts.setTextRange(block, node.body);
                if (emitSuperHelpers && hasSuperElementAccess) {
                    // Emit helpers for super element access expressions (`super[x]`).
                    if (resolver.getNodeCheckFlags(node) & 4096 /* NodeCheckFlags.AsyncMethodWithSuperBinding */) {
                        ts.addEmitHelper(block, ts.advancedAsyncSuperHelper);
                    }
                    else if (resolver.getNodeCheckFlags(node) & 2048 /* NodeCheckFlags.AsyncMethodWithSuper */) {
                        ts.addEmitHelper(block, ts.asyncSuperHelper);
                    }
                }
                result = block;
            }
            else {
                var expression = emitHelpers().createAwaiterHelper(inHasLexicalThisContext(), hasLexicalArguments, promiseConstructor, transformAsyncFunctionBodyWorker(node.body));
                var declarations = endLexicalEnvironment();
                if (ts.some(declarations)) {