Component Communication Interview Questions

Props are custom attributes for passing data from parent to child components. Defined using props option or defineProps. Support type checking, default values, and validation. Example: defineProps(['title']) or props: { title: String }.

Use $emit method or defineEmits to send events to parent components. Parents listen with v-on or @. Support event arguments. Example: emit('update', value) or this.$emit('update', value).

Provide/inject enables dependency injection between components. Parent provides data/methods, descendants inject them. Works across component layers. Alternative to prop drilling.

v-model creates two-way binding between parent and child. Combines prop and event. Component must emit update:modelValue event. Support custom v-model modifiers.

Refs provide direct access to child component instances. Use template ref attribute and ref(). Access methods and properties. Handle component communication.

Slots pass template content to child components. Support default and named slots. Enable component composition. Pass data back through scoped slots.

Define prop types, required status, default values. Use validator functions. Handle prop constraints. Support type checking. Example: prop: { type: String, required: true }.

Modifiers customize event handling. Include .prevent, .stop, .once. Chain multiple modifiers. Support custom modifiers. Example: @click.prevent.stop.

Watch props for changes. Handle prop updates. Support reactive props. Implement update logic. Example: watch(() => props.value).

attrs contains non-prop attributes passed to component. Access via $attrs or useAttrs(). Handle attribute inheritance. Support fallthrough attributes.

Create centralized event bus for component communication. Handle event subscription. Support event broadcasting. Implement event patterns.

Use promises or async/await. Handle loading states. Support error handling. Implement async patterns. Handle response handling.

Define methods using defineExpose. Access through template refs. Handle method calls. Support method parameters. Example: defineExpose({ method }).

Pass data to slot content. Access slot props. Handle slot scope. Support slot defaults. Example: v-slot='slotProps'.

Transform props before use. Handle computed props. Support prop formatting. Implement transformation logic. Handle prop updates.

Validate event payload. Define event contracts. Handle validation errors. Implement validation logic. Support event types.

Define injection types. Handle type safety. Support type inference. Implement type validation. Handle type errors.

Implement prop forwarding. Handle prop chains. Support inheritance patterns. Implement inheritance logic. Handle prop conflicts.

Create event processing middleware. Handle event transformation. Support middleware chain. Implement middleware patterns.

Test component interaction. Handle event testing. Support prop testing. Implement test utilities. Handle test scenarios.

Create complex communication systems. Handle advanced scenarios. Support pattern composition. Implement advanced strategies.

Optimize component interaction. Handle performance bottlenecks. Support optimization strategies. Implement performance patterns.

Handle secure communication. Implement data protection. Support security patterns. Handle sensitive data. Implement security measures.

Track component interaction. Handle performance monitoring. Support debugging tools. Implement monitoring strategies.

Design scalable communication systems. Handle system organization. Support architecture patterns. Implement design principles.

Implement version control for APIs. Handle backwards compatibility. Support version migration. Implement versioning strategies.

Create comprehensive documentation. Generate API docs. Support example usage. Implement documentation systems.

Implement deployment strategies. Handle environment configuration. Support production optimization. Implement deployment patterns.

Create comprehensive test suites. Handle integration testing. Support unit testing. Implement test strategies. Handle test coverage.