Is it feasible to alter the TypeScript interface for the default JavaScript object (JSON)?

When dealing with cyclic objects, JSON.stringify() can break (as mentioned in https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Cyclic_object_value)

An alternative solution suggested in the same article is to use 'cycle.js', which introduces two additional methods to the global JSON object - .decycle() & .retrocycle() for handling cyclic objects during stringification.

While this method works well, TypeScript might throw errors unless specific workarounds like //@ts-ignore or using JSON['retrocycle']() are implemented, although they may not be aesthetically pleasing.

Is there a way to create a custom "JSON.d.ts" file to override the default TypeScript interface for the global JSON object?

javascriptjsontypescripttypesinterface

Answer №1

It's interesting to see the back and forth on why this post was closed and then reopened. After gathering information from various sources, I have put together a solution for those who may be curious:

To start, create a .d.ts typefile in a folder called src/custom_types:

The file path would be src/custom_types/JSON.d.ts

Within JSON.d.ts:

export declare global {
    interface JSON {
            decycle(object: any, replacer?: any): string;
            retrocycle(something: any): any;
    }
}

In your tsconfig.json file:

{
  "compilerOptions": {
    ...
    "baseUrl": ".",
    ...
    "paths" : {
      ...
    "*" : ["src/custom_types/*"],
    }
  },
  "typeRoots": [
    ....
    "src/custom_types/",
    ],
}

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