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I am getting an error with this javascript function definition in Azure. I am defining this within an Azure function for use by the exported function.
async function getData() {
var data = await postRequest();
return data;
};
Below is the error I am getting in the console. Is async await syntax not supported in Azure functions?
If yes, how would I implement an async call (such as a REST call made with node-rest-client).
2018-01-05T10:50:55.448 Function started (Id=a4995e6f-141a-46bb-becf-
468f49f7505d)
2018-01-05T10:50:55.565 Exception while executing function:
Functions.MyFunctionName. mscorlib: One or more errors occurred.
D:\home\site\wwwroot\MyFunctionName\index.js:90
async function getData() {
^^^^^^^^
SyntaxError: Unexpected token function
at createScript (vm.js:56:10)
at Object.runInThisContext (vm.js:97:10)
at Module._compile (module.js:542:28)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
at eval (eval at compileFunc (D:\Program Files (x86)\SiteExtensions\Functions\1.0.11388\bin\edge\double_edge.js:34:28), <anonymous>:1:80).
2018-01-05T10:50:55.673 Function completed (Failure, Id=a4995e6f-141a-46bb-becf-468f49f7505d, Duration=221ms)
522
Prevent problems. The code should be async without any blocking calls is the suggested programming practice for function app. The function apps' runtime allows us to make the call async and returns the result in which we can just 'await' and handle exceptions seamlessly.
An async method runs synchronously until it reaches its first await expression, at which point the method is suspended until the awaited task is complete. In the meantime, control returns to the caller of the method, as the example in the next section shows.
The async keyword turns a method into an async method, which allows you to use the await keyword in its body. When the await keyword is applied, it suspends the calling method and yields control back to its caller until the awaited task is complete. await can only be used inside an async method.
An async function is a function declared with the async keyword, and the await keyword is permitted within it. The async and await keywords enable asynchronous, promise-based behavior to be written in a cleaner style, avoiding the need to explicitly configure promise chains.
For javascript async syntax support you need to install the latest version of the cli along side with node v8.x
npm i -g azure-functions-core-tools@core
Additionally you'll need to enable the beta runtime on azure so it also works when deploying.
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