[bug] can't inject values that evaluate to false

[andrei-tatar]

Hello,

If I want to register a value of 0/null/false/empty string, it won't get resolved and it will fail.

Ex:
container.register({ token: 'foo', useValue: 0 });
container.resolve('foo') fails

The problem seems to be in container.ts : registerOne(provider).

if (provider.useValue) {
  registryData.instance = provider.useValue;
}

I would suggest replacing it with

if (provider.useValue !== void 0) {
  registryData.instance = provider.useValue;
}

or

if ('useValue' in provider) {
  registryData.instance = provider.useValue;
}

to support undefined values.

Also, maybe check if a provider is valid (has only one of useClass/useValue/useFactory set on something different than undefined).

Thanks

[basedalexander]

Hey! Thanks for submitting your bug report! Never thought such use case would come up. I'm gonna fix that today.

[andrei-tatar]

Glad to be helpful :)