Extend tcType

[CharlieSnowCode]

I am looking to write custom filters in TypeScript. Since we can only include JavaScript files in a project, I would like to have the JS function call a TS function. I started by implementing a new function in tc-types.d.ts When I call it from my custom .js file, I get intellisense, but when I run it I get "Error in Custom Filter: x - x is not a function".
Has anyone been able to add a .ts file to a project and use it from your custom filter?
Many thanks!

[rangav]

Hi @CharlieSnowCode, I haven't tried with typescript.

But can you try to compile the typescript file to a js file and attach the js file?

[CharlieSnowCode]

I compiled the TS file using 'tsc', now I get an error in the .ts file "duplicate function implementation". I then included the new .js file in the collection and get the same thing.

[rangav]

You need to compile ts to js file, then if you are using multiple files, then you need to bundle to single file.

[CharlieSnowCode]

I created a simple way to recreate the issue.

1. Create a TypeScript file (newTS.ts), with an exported function 'greet'
2. Import that function into the JavaScript (custom filter) file that is a part of my collection.
3. Call that new function from a Test
   Error is: 'import' and 'export' may appear only with 'sourceType: module'

So perhaps there is a limitation of the JS file that's included into a ThunderClient project, as the solution appears to be to mark that file as a 'module' and rename the file to have a .mjs extension.
Reference:
Contents of newTS.ts
export function greet(name: string) { console.log(Hello, ${name}!); }
Import function into JS file
import { greet } from './newTS';

[CharlieSnowCode]

Should I create a feature request for TypeScript support?
Thanks.

[rangav]

Please create a new feature request, I will look into it.