Switch multiple conditions type error

[Fi1osof]

Bug Report

🔎 Search Terms

switch undefined

🕗 Version & Regression Information

6.4 ~ 4.7.4 (latest)

⏯ Playground Link

Playground link with relevant code

💻 Code

type State = {
    foo: string
}

let state: State | undefined;

let result: boolean = false;

if (state) {

    state.foo === "sdfdsf"
    switch (true) {

        case state.foo === 'test':
        case state.foo === 'test':
            result = true;
            break;

        // Object is possibly 'undefined'.ts(2532)
        case state.foo === 'test':
        case state.foo === 'test':
            result = true;
            break;

        // Object is possibly 'undefined'.ts(2532)
        case state && state.foo === 'test':
        case state.foo === 'test':
            result = true;
            break;

        // Object is possibly 'undefined'.ts(2532)
        case state ? state.foo === 'test' : false:
        case state.foo === 'test':
            result = true;
            break;

    }

}

🙁 Actual behavior

Error Object is possibly 'undefined'.ts(2532)

🙂 Expected behavior

No error

[MartinJohns]

Duplicate of #37178.

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.