When utilizing the @Prop decorator in TypeScript, the compiler throws an error prompting the need to initialize the prop

Currently, I am utilizing Vue in combination with TypeScript along with the 'vue-property-decorator' package.

When attempting to utilize a prop as shown below:

@Prop({ default: '' }) private type: string

An error is triggered by the TS compiler stating: 

Property 'type' has no initializer and is not definitely assigned in the constructor.

However, if I provide an initialization like this:

@Prop({ default: '' }) private type: string = ''

A warning appears in the browser console:

vue.runtime.esm.js?ff9b:587 [Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "type"

In such a situation, what steps should I take to prevent any errors or warnings?

The only solution that comes to mind is setting 

"strictPropertyInitialization": false
in tsconfig.json, although I would prefer to avoid doing so if feasible.

Thank you!

typescriptvue.jsvuejs2vue-componenttslint

Answer №1

The error message you are encountering is caused by TypeScript's implementation of Strict Class Initialization, which was introduced in version 2.7. The official release notes for TypeScript 2.7 explain how to resolve this issue using the definite assignment operator (!). To rectify your specific situation, you can use the following code snippet:

@Prop({ default: '' }) private type!: string

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