JS & TS FeaturesLesson 39Free preview

Node Adv. TypeScript

This lesson is part of Node.js · All levels

Summary

Advanced TypeScript for Node includes generic, type guard, utility type, and decorator to build secure and easy-to-keep APIs. This ability allows you to create reusable types without sacrificing flexibility. The result is a clear data contract between modules in a large project.

Key points

Generic allows reusable types for many types of data
Type guard such as typeof and in securely narrow the type
Utility type (Partial, Pick, Omit) composes type from other types
Declaration file (.d.ts) bridges JavaScript packets without type

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