TypeScript error: 'Intl' has no exported member 'DateTimeFormatPart'

[h-h-h-h]

I'm just getting started with TypeScript and try to migrate a test project in VS Code to it.

I import this polyfill globally only in the entry point file with:

import 'temporal-polyfill/global'

Then, in other files, Temporal is unavailable. So, I tried this tsconfig.json:

{
  "include": [
    "./node_modules/temporal-polyfill/dist/global.d.ts"
  ]
}

Temporal is still unavailable and, for global.d.ts, this error is shown:

[line 9]     formatToParts(dateArg?: DateTimeFormatArg): Intl.DateTimeFormatPart[];
                                                              ^^^^^^^^^^^^^^^^^^
+------------------
| type Intl.DateTimeFormatPart = /*unresolved*/ any
| Namespace 'Intl' has no exported member 'DateTimeFormatPart'. ts(2694)
+--------------------

Also: Surely, it's not recommended to link to a file in node_modules. How is it done properly?

---

When I use this definition file in tsconfig.json instead, it works.

[h-h-h-h]

There's something strange going on, because, right after posting, the file from my last sentence stopped working with IteratorResult complained about.

I forgot to run npm install typescript --save-dev (oops). Still:

• The previously mentioned definitions file stays broken, although the typescript npm package contains IteratorResult.
• This repo's ./node_modules/temporal-polyfill/dist/global.d.ts isn't complained about, but Temporal still isn't available and wavily underlined, and its children on their own like ZonedDateTime are provided by intellisense (with source stated on the right of the box as "temporal-polyfill"), but wavily underlined with error "Cannot find name 'ZonedDateTime'. ts(2304)".

[arshaw]

Hi @h-h-h-h , this is happening because you have an old lib in your tsconfig. You can try adding lib: ['ES2020'] or add the Intl lib only like this.

It might actually be fixed in the most recent version (0.2.0) even without edits to lib because the typescript definitions access it in a possibly-safer way (globalThis.Intl.DateTimeFormatPart which might fallback to undefined). Would you mind giving 0.2.0 a spin?

[h-h-h-h]

Thank you, but I'm currently not working in the ecosystem anymore.