Enumerated type alias in Typescript

Within my typings file, I have the following:

declare namespace Somatic {
    enum PropType {
        html,
        object,
        css
    }
}

In a separate file named index.ts, I create a shorter alias for this enum like so:

type PropType = Somatic.PropType;

Afterwards, I attempt to utilize the aliased enum type within a switch statement :

switch (propType) {
    case PropType.html:
        break;
    .
    .
    .
    }

However, Typescript fails to recognize the values of the aliased enum type. What could be causing this issue?

Answer №1

It is advisable to utilize the import keyword instead of type:

import PropType = Somatic.PropType;

For more information on import alias declarations, click here.

** Please note that this syntax will not function if you are utilizing babel-plugin-transform-typescript because it is a typescript-only form of import. Generally, using namespaces is discouraged.

Answer №2

When working with TypeScript, it's important to understand that an enum serves as both a type and a map. To properly handle this, it is recommended to create separate aliases for the type and the map:

type CustomTypeEnum = Example.CustomType;
const CustomType = Example.CustomType;

Answer №3

In essence, a definition file serves the purpose of specifying the type of pre-existing code. TypeScript Enums are essentially numerical values, but it's probable that the original code you're working with doesn't rely on actual numbers. A more effective approach might involve utilizing string replacements instead;

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