Add NonEmptyObject type

[kkmuffme]

Close #621

[kkmuffme]

@sindresorhus the failing test reports an error in an empty line? Could you please pinpoint me at what the issue is?

Looked at the .ts instead of the .d.ts by accident.

[sindresorhus]

The diff view shows the error inline. You should also always run npm test locally before pushing, which also shows the error description.

[sindresorhus]

Closing for lack of response.

[kkmuffme]

It's done this second :D

[kkmuffme]

@sindresorhus ha ha, I just fixed and finished it in exactly the second you closed it. Can you reopen & merge it please.

[sindresorhus]

You need to fix the merge conflicts.

[sindresorhus]

Tests are failing.

[kkmuffme]

Yeah, I decided to change the type as I realized it was behaving unexpectedly.

However now, the failing tests are not clear. The test has exactly the type I see in playground:
https://www.typescriptlang.org/play?target=99&module=1&jsx=0#code/JYWwDg9gTgLgBDAnmApnA3gCQIYGcBKKAjgK7BQoAmA0iorgDRyGnkoCCMAMinjAPIA7FEwCSuAKKlsAGwC+cAGZQIIOAHIkqALSKUuGOoDcAKBMoAHpFgJkaAHIRBE8En4AjAFYoAxjAA8ACpwljAogpS4cBBevjAAfHAAvHA4BMRkFDR0uEGJoeGRCFAkaAD8cMEAXMwZbJw8fEIoQUwA1nQQipXxpiZaaIH6MIF2AEzJGCYAkNhlNQZQwIIA5qbT7vNw7hAQMryCpnJ9lL4y2BRwPk4GCMNjNY7Oroge3n5Bw6OoY71mA3AJFZsBFvi1AokUsEChEogAKAB0SIuK1wNWWeigcHYAEpkokMSgsfgTHA4BVEcioKiakCwCDKGD-Ox4nikok6Qymfh4qS4DVoRYwrC4ISsfw+RV0HAANrUUWCOAdRBdOD8AC6NX4cvVcDkfJqwgAbkS+v07IDgREqJNOaC7P4BqqwgZfqYAVISLJJuJPbJ-OhsAsYEtVkZtlsdnsDnAAD5wEjWxTLKjhhTxwNbRbLFZxhNJlOUcPuGpR-YgtNMO2Mh1PFxgNyxD5DAxg37xP5mExAA issue is unrelated to this PR

[kkmuffme]

@sindresorhus all tests pass, please review again and merge it

[sindresorhus]

Thanks ;)