As I continue to explore the integration of TypeScript with Vue, I have encountered a query about the declaration found in the Vue property decorator documentation.
@Prop({ default: 'default value' }) readonly propB!: string
As I continue to explore the integration of TypeScript with Vue, I have encountered a query about the declaration found in the Vue property decorator documentation.
@Prop({ default: 'default value' }) readonly propB!: string
In this particular scenario, the use of the bang operator is crucial because the property propB is guaranteed to have a value due to the decorator filling it in. TypeScript may not be aware of this, so without an explicit value assignment, it assumes a type signature of string | undefined. By adding the exclamation mark, you are informing TypeScript that propB will never be undefined, thereby simplifying the signature to just string.
This approach is necessary when working in a strict TypeScript environment, which is highly recommended for best practices.
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