Type Inference
In TypeScript, several places where type inference is used to provide type information when there is no explicit type annotation. The type of the x variable is inferred to be a number. This inference occurs when variables and members are initialized, set parameter default values are, and determine function return types. For example, let x: number. In most cases, type inference is straightforward. In the following sections, we’ll explore some nuances in how types are inferred. For example, let x: (number | null)[]
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