This article explains how to filter arrays in TypeScript while maintaining correct types. It demonstrates how to create a type guard to ensure that the filtered array only contains the desired type. It also discusses the downsides of type guards and compares them to assertion functions.
When working with optional parameters in TypeScript, you may encounter the error message "undefined cannot be assigned to a specific type." This happens because optional parameters can either be `undefined` or of a specified type. To avoid this error, you can use several techniques.
GitHub workflows are a great way to set up a continuous integration pipeline. You can define jobs within a workflow and use GitHub's runners to execute those jobs. These runners can be hosted on GitHub's infrastructure or your own. In this tutorial, you'll learn how to use a matrix strategy to run jobs concurrently using different runner images.
The `noUncheckedIndexedAccess` compiler option in TypeScript helps catch potential errors when accessing arrays or tuples with undefined or out-of-bounds indices. Enabling this option ensures that developers handle cases where indexed accesses can result in undefined values.
Branded types in TypeScript can help catch programming errors early by ensuring that values meet certain criteria before they are used. To create a branded type, you add a readonly property to an existing type. Branded types are especially useful when combined with assertion functions, which validate inputs and assert the branded type after successful validation.