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.
TypeScript has two concepts: type annotations and type inference. Type annotations involve explicitly specifying the type of a parameter or variable, while type inference occurs when TypeScript automatically determines the type based on the implementation.
TypeScript has a structural type system, which means that types are compatible based on their shape or structure rather than their names. This allows you to interchangeably use types with different names but identical properties. You can assign one type to another if they share the same properties, including optional properties.
TypeScript 4.9 introduces the "satisfies" operator, which allows us to verify that the type of an expression matches a specific type. This operator can be used to narrow down a union type and provide more precise type checking. In the example given, the "satisfies" operator is used to restrict the keys and values of a record type.
Downleveling is the process of converting modern TypeScript code into an older version of JavaScript. This allows developers to target older JavaScript environments that may not support the latest features.