How to Access Interface Keys as an Array in TypeScript?

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:

1. Install the transformer:

   npm install ts-transformer-keys

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2. Create a TypeScript configuration file (tsconfig.json):

   <code class="json">{
     "compilerOptions": {
       "plugins": [
         {
           "name": "ts-transformer-keys"
         }
       ]
     }
   }</code>

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3. 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>

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   The IMyTableKeys variable now contains an array of all interface keys.

Advantages of Custom Transformers

Custom transformers offer several benefits:

• Flexibility: They extend TypeScript's capabilities, allowing for custom transformations not covered by existing features.
• Type Safety: The generated code maintains type information, ensuring code correctness.
• Extensibility: Transformers can be combined or extended to create custom solutions for specific use cases.

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