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Dynamic Typing with No Type

Explore how TypeScript manages dynamic typing using the any type, custom finite types, enums with numeric and string values, and the void type for functions. Understand type inference and how these features help maintain type safety in Angular applications when working with legacy code or loosely typed data.

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Sometimes, it is hard to infer the data type from the information we have at any given point, especially when we are porting legacy code to TypeScript or integrating loosely typed third-party libraries and modules. TypeScript supplies us with a convenient type for these cases. The any type is compatible with all the other existing types, so we can type any data value with it and assign any value to it later:

TypeScript 4.9.5
let distance: any;
distance = '1000km';
distance = 1000;
const distances: any[] = ['1000km', 1000];

However, great power comes with great responsibility. If we bypass the convenience of static type checking, we are opening the door to type errors when piping data through our modules. It is up to us to ensure type safety throughout our application.

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