To do that, update the Settings - User file or your project settings with the following: "typescript_tsdk": "/node_modules/typescript/lib" This is typically useful for trying out nightly builds, prototyping with custom builds, or compatibility with node_modules-free package managers like Yarn 2. This plugin can be configured to load an alternate version of TypeScript. See more information in our Tips and Known Issues wiki page. If the node_path setting is present, this will override the PATH environment variable and the plug-in will use the value of the node_path setting as the node executable to run. The plug-in looks for node in the PATH environment variable (which is inherited from Sublime). The plug-in uses Node.js to run the TypeScript server. In TypeScript 3.7 we introduced uncalled function checks to report an error when you’ve forgotten to call a function.The plugin uses an IO wrapper around the TypeScript language services to provide an enhanced Sublime Text experience when working with TypeScript code. Uncalled Function Checks in Conditional Expressions you honestly don’t have the time to decide which of these options is better.you are in the middle of an upgrade between two different versions of TypeScript, and a line of code errors in one version but not another.you have a larger project and new errors have appeared in code with no clear owner.you’re in a reasonably-sized project with a proactive team that wants to remove suppression comments as soon affected code is valid again.you expect a fix to be coming in fairly quickly and you just need a quick workaround.you’re writing test code where you actually want the type system to error on an operation.While it’s entirely up to you and your team, we have some ideas of which to pick in certain situations. You might be tempted to switch existing // comments over to // and you might be wondering which is appropriate for future code. In some ways // can act as a suppression comment, similar to // difference is that // will do nothing if the following line is error-free. We’d like to extend a big thanks to Josh Goldberg, the contributor who implemented this feature.įor more information, you can take a look at the ts-expect-error pull request. The function’s types declare that it takes two strings so that other TypeScript users can get type-checking errors, but it also does a runtime check (maybe only in development builds) to give JavaScript users a helpful error. Imagine that we’re writing a library in TypeScript and we’re exporting some function called doStuff as part of our public API. While there’s still room for improvement, we hope this work translates to a snappier experience for everyone! // Comments TypeScript 3.9 addresses this issue by changing the internals of how the compiler and language service caches file lookups. We heard from the Visual Studio Code team that when renaming a file, just figuring out which import statements needed to be updated could take between 5 to 10 seconds. We also have some changes to file renaming functionality in editor scenarios. In total, we believe we’ve achieved around a 40% reduction in material-ui’s compile time! We’ve dived deep here, with a series of different pull requests that optimize certain pathological cases involving large unions, intersections, conditional types, and mapped types.Įach of these pull requests gains about a 5-10% reduction in compile times on certain codebases. Our team has been focusing on performance after observing extremely poor editing/compilation speed with packages like material-ui and styled-components. TypeScript 3.9 ships with many new speed improvements. We’ll be experimenting more with the feature, but we won’t be shipping it as part of this release. We initially anticipated shipping awaited in TypeScript 3.9, but as we’ve run early TypeScript builds with existing codebases, we’ve realized that the feature needs more design work before we can roll it out to everyone smoothly.Īs a result, we’ve decided to pull the feature out of our main branch until we feel more confident. This goal of this type operator is to accurately model the way that Promise unwrapping works in JavaScript. If you’ve been following our issue tracker and design meeting notes, you might be aware of some work around a new type operator called awaited. If you’ve been stuck on older versions of TypeScript due to issues around Promises, we encourage you to give 3.9 a shot! What About the awaited Type? Thanks to a pull request from Jack Bates, this has been fixed with improvements in our inference process in TypeScript 3.9. The fact that sealExhibit contained an undefined somehow poisoned type of lion to include undefined.
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