Pulumi's use of TypeScript for cloud infrastructure development is praised for its robust type system and early error detection capabilities, which enhance productivity. A core innovation in Pulumi's programming model is the introduction of a complex type system that allows for expressing dependencies as a type called Input<T>, which encompasses various data states like promises and dependency information. This flexibility benefits data producers but can complicate data consumption, leading to cumbersome code structures known as the "programming Pyramid of Doom." To address this, Pulumi developed an advanced TypeScript function that recursively unwraps all layers of these complex types, simplifying code by converting deeply nested data into more manageable forms. This solution leverages TypeScript's advanced features like Union, Mapped, Conditional, and Inferred Types, allowing for expressive and type-safe handling of intricate data dependencies. The implementation not only reduces code complexity but also maintains TypeScript's type-checking support, significantly improving code readability and maintainability.