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Accessing Interface Keys as an Array in TypeScript
TypeScript interfaces are commonly used to define the structure of objects with specific properties. However, there may be instances when you need to obtain an array of property keys from an interface. This allows for easier iteration and manipulation of interface data.
Obtaining Interface Keys as an Array
As of TypeScript 2.3, custom transformers provide a powerful mechanism for extending the language. One notable transformer, ts-transformer-keys, can be employed to extract interface keys into an array.
Using the ts-transformer-keys Transformer
To utilize the ts-transformer-keys transformer, follow these steps:
Install the transformer:
npm install ts-transformer-keys
Create a TypeScript configuration file (tsconfig.json):
<code class="json">{ "compilerOptions": { "plugins": [ { "name": "ts-transformer-keys" } ] } }</code>
In your TypeScript code:
<code class="typescript">import { keys } from 'ts-transformer-keys'; interface IMyTable { id: number; title: string; createdAt: Date; isDeleted: boolean; } const IMyTableKeys = keys<IMyTable>(); // ['id', 'title', 'createdAt', 'isDeleted']</code>
The IMyTableKeys variable now contains an array of all interface keys.
Advantages of Custom Transformers
Custom transformers offer several benefits:
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