As I am still fairly new to writing questions, I apologise for possible misvoicing.

The problem: I have a vue app with typescript.

export default {
    methods: {
        setProgram: (program: Program)=>{
            this.program = program // TS2532: Object is possibly 'undefined'.
            this.step++ // TS2532: Object is possibly 'undefined'.
        }
    },
    ...
}

While I really like this feature of typescript, I really am sure, that "this" will not be undefined in this case.

How can I calm typescript down regarding the use of "this"?

Thank you very much everyone, have a great day ahead!

Best Dom.

As I am still fairly new to writing questions, I apologise for possible misvoicing.

The problem: I have a vue app with typescript.

export default {
    methods: {
        setProgram: (program: Program)=>{
            this.program = program // TS2532: Object is possibly 'undefined'.
            this.step++ // TS2532: Object is possibly 'undefined'.
        }
    },
    ...
}

While I really like this feature of typescript, I really am sure, that "this" will not be undefined in this case.

How can I calm typescript down regarding the use of "this"?

Thank you very much everyone, have a great day ahead!

Best Dom.

• javascript
• typescript
• vue.js
• vuejs3

• TypeScript Support - Basic Usage – Phil Commented Nov 24, 2021 at 22:53
• Yep, already set the remended configuration. Still doesn't work ... – Dominik Zi Commented Nov 24, 2021 at 23:00
• I specifically meant the Vue.extend({ ... }) bit, ie export default Vue.extend({ methods: { ... } }) – Phil Commented Nov 24, 2021 at 23:06
• Okay, just tried that. Unfortunately still the same ... – Dominik Zi Commented Nov 24, 2021 at 23:12
• I mean even if I did if(this!=undefined) this.program = program it will give me this error ... – Dominik Zi Commented Nov 24, 2021 at 23:24

1 Answer 1

Got it!

"this" might be undefined if used inside lambda function :)

just change

setProgram: (program: Program) => {

to:

setProgram: function (program: Program) {

and it works ...