Angular - Fundamentals
What will happen if you try to import a service without adding it to providers or using providedIn in Angular?
What will happen if you try to import a service without adding it to providers or using providedIn in Angular?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Recall Angular dependency injection rules
Services must be provided via providers array or providedIn to be injectable.Step 2: Consequence of missing provider
Without provider, Angular cannot create the service instance and throws an error at runtime.Final Answer:
Angular throws a runtime error when injecting the service -> Option BQuick Check:
Missing provider = runtime error = A [OK]
Quick Trick: Always provide services to avoid injection errors [OK]
Common Mistakes:
- Assuming Angular auto-provides services
- Thinking service works without provider
- Confusing tree-shaking with missing provider errors
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