Using the await function to wait on an asynchronous process as that top-level might result in a syntax error if other code tries to read results that haven’t yet been returned, and attempts to avoid that by using async main make code more complicated and harder to test or perform static analysis on. “If you’re running a module initializer - the top level of your code that runs when your module begins - that hasn’t always been regarded as asynchronous,” Palmer said. JavaScript has had asynchronous functions since ECMAScript 2017, but developers have to explicitly declare a function to be asynchronous. We asked two of the co-chairs of the TC39 committee that standardizes ECMAScript, Rob Palmer (head of Bloomberg’s JavaScript infrastructure and tooling team) and Brian Terlson (principal architect on the Azure SDK for TypeScript and JavaScript, and former editor of the spec) to pick out some of the most significant proposals - including major improvements to working with dates. But these proposals need to be tried out in an implementation to see how well they actually work in practice.įor instance, the proposal to be able to work backward through an array starting with the last element the way you can in Python is currently implemented as a polyfill, in an attempt to discover if it clashes with any commonly used JavaScript frameworks. And you can get an idea of what other features may make it into ECMAScript 2022 by looking at which have reached stage three, where the spec has been signed off and the tests have been passed. That will include all the new feature proposals that have reached stage four by March 2022 - proposals that have been signed off by the ECMAScript editors, passed the test suite and shipped in at least two implementations.Ī handful of proposals are already at that stage. JavaScript continues to evolve, and the next annual update to ECMAScript, which formally standardizes the JavaScript language, will be approved in July 2022. Here is the extension method: public static class JavascriptExtension ", ConfigurationManager.Editor’s Note: This article has been updated to clarify which private class proposals have already reached stage four. Note: this implementation caches the timestamp for 1 minute so we don't thrash the disk quite so much. I did this with an extension method, and using it in my CSHTML files. I solved this by tacking a last modified timestamp as a query parameter to the scripts.
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