how to make synchronous call in typescript

To learn more, see our tips on writing great answers. Also, create a new folder named src inside the typescript folder.. Simplify Async Callback Functions using Async/Await. Ex: a sample ajax call Check if the asynchronous request is false, this would be the reason . Consider the code block below, which illustrates three different Promises that will execute in parallel. finalized) as the standard for JavaScript on June 27th, 2017. let data = await this.service.getDataSynchronous (url) console.log (data) } Note : The await keyword can only be used inside an async function. This is the wrong tool for most tasks! OK, that out of the way, how do I make it so that I could: The examples (or lack thereof) all use libraries and/or compilers, both of which are not viable for this solution. That is, you can only await inside an async function. If all the calls are dependent on . rev2023.3.3.43278. source$.subscribe({ next: doSomething, error: doSomethingElse, complete: lol }). So all you just need to do is installing Node.js 8 and enjoy all power which async/await brings us. TypeScript: Documentation - More on Functions If you preorder a special airline meal (e.g. Best practice to call a Async method from a Synchronous method in .Net In a client application you will find that sync-request causes the app to hang/freeze. The point, however, is that now, instead of returning the string itself as we do in findAssetSync, findAssetAsync returns a promise.. To use top-level await in TypeScript, you have to set the target compiler option to es2017 or higher. You could fix this by returning the result of the Promise chain, because Mocha recognizes if a test returns a Promise and then waits until that Promise is settled (unless there is a timeout). By using Async functions you can even apply unit tests to your functions. Start using ts-sync-request in your project by running `npm i ts-sync-request`. And before . So unless you the reader have an unavoidable situation like the OP (or, in my case, are writing a glorified shell script with no callbacks, events, etc. As pointed at the very beginning of this article, Node.js 7.6 was released a few months ago (and Node.js 8, which is a major version, was released just a few weeks ago), bringing us default support and coverage for async/await. One of the few cases in which a synchronous request does not usually block execution is the use of XMLHttpRequest within a Worker. This works, however it requires the client to call the init method right after it creates an instance of the class, which means 2 lines of code instead of one. I suggest you use rxjs operators instead of convert async calls to Promise and use await. Unfortunately not.

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