Cannot find module 'undici-types' or its corresponding type declarations

[everdimension]

I updated from 0.33 to 1.2.1 and seeing this error when bundling my project:

Cannot find module 'undici-types' or its corresponding type declarations.

1 import { type RequestInit as UndiciRequestInit } from 'undici-types';

I see that this dependency is indeed referenced in source code:

ky/source/types/request.ts

Line 1 in 58b5c4a

import {type RequestInit as UndiciRequestInit} from 'undici-types';

But at the same time it's not present in package dependencies:

ky/package.json

Lines 56 to 76 in 58b5c4a

	"devDependencies": {
	"@sindresorhus/tsconfig": "^4.0.0",
	"@type-challenges/utils": "^0.1.1",
	"@types/body-parser": "^1.19.2",
	"@types/busboy": "^1.5.0",
	"@types/express": "^4.17.17",
	"@types/node": "^20.5.7",
	"ava": "^5.3.1",
	"body-parser": "^1.20.2",
	"busboy": "^1.6.0",
	"del-cli": "^5.1.0",
	"delay": "^6.0.0",
	"expect-type": "^0.16.0",
	"express": "^4.18.2",
	"pify": "^6.1.0",
	"playwright": "^1.40.1",
	"raw-body": "^2.5.2",
	"tsx": "^4.7.0",
	"typescript": "^5.2.2",
	"xo": "^0.56.0"
	},

Why is there a dependency on a third-party package in source code?
If it is necessary, ideally it should be bundled into the build so that consumer packages do not need to install a third-party dependency only for types.

Alternatively, if this is the only usage of this type, maybe it can be inlined into the source code?