Do you have an index.d.ts file available for canonical-json?

I am currently working on creating an index.d.ts file specifically for canonical-json. Below is my attempted code:

declare module 'canonical-json' {
    export function stringify(s: any): string;
}

I have also experimented with the following snippets:

declare namespace JSON {
  export function stringify(s:any):string;
}

export = JSON;

And

export as namespace JSON;
export const stringify: (o:any) => string;

However, I keep encountering the error message:

canonical_json_1.stringify is not a function

This issue persists across all three attempts that I have made.

For reference, here is the Stackblitz link: https://stackblitz.com/edit/typescript-cryptojs?file=src%2F%40types%2Fcanonical-json%2Findex.d.ts

javascripttypescriptnpmtypes

Answer №1

When dealing with a common js module, where the entire export is an object, you have multiple options for importing it. One approach is to use the specific syntax export =:

// src\@types\canonical-json\index.d.ts
declare module 'canonical-json' {
    function stringify(s: any): string;
    export = stringify;
}
// index.ts
import stringify = require('canonical-json');

Alternatively, you can enable "esModuleInterop": true to access the export as a default import:

// src\@types\canonical-json\index.d.ts
declare module 'canonical-json' {
    function stringify(s: any): string;
    export = stringify;
}
// index.ts
import stringify from 'canonical-json';

Another option is to define the module with just a default export, but remember to set "esModuleInterop": true since there is no actual default export in the module:

// src\@types\canonical-json\index.d.ts
declare module 'canonical-json' {
    export default function stringify(s: any): string;
}

// index.ts
import stringify from 'canonical-json';

Note: I tested these configurations in node, but they should work similarly in other environments as well.

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