Angular · Senior · Question 20 of 75

What is the difference between `providers` and `viewProviders` in a component?

✓Correct answer: viewProviders are visible to the component's own view but not to content projected into it
2viewProviders are created once per application
3They are synonyms

Explanation

Use viewProviders to keep an internal service private, so components passed in through <ng-content> by the parent can't accidentally inject it.

Further reading

Angular: Hierarchical injectors ↗

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