package.json's exports mapping does not include types field

[jeffposnick]

When trying to import the preact-router and preact-router/match modules from inside a project written using TypeScript 4.7+ with moduleResolution: "NodeNext", TypeScript is unable to find the corresponding type definitions.

If I manually modify node_modules/preact-router/package.json to add types fields to the preact-router and preact-router/match exports, then TypeScript will pick up the type definitions:

"exports": {
	".": {
		"module": "./dist/preact-router.mjs",
		"import": "./dist/preact-router.mjs",
		"require": "./dist/preact-router.js",
		"types": "./index.d.ts"
	},
	"./package.json": "./package.json",
	"./match": {
		"module": "./match/index.mjs",
		"import": "./match/index.mjs",
		"require": "./match/index.js",
		"types": "./match/index.d.ts"
	},
	"./match/package.json": "./match/package.json"
},

Can this module be published with the addition of those types fields in the exports section of package.json? I'm happy to file a PR to add them if that seems reasonable.

See developit/microbundle#990 for a related discussion about documenting this as part of microbundle's TypeScript guidance.