Refinement of object works and it doesn't

[lll000111]

I created a few tiny examples, one per demo function:

Playground link

In particular, these two:

function demoV1(thing: unknown): void {
    if (thing === null || typeof thing !== 'object') {
        throw new Error('not an object');
    }

    // ERROR: thing is object || null
    const obj: object = thing;
}

function demoV2(thing: unknown): void {
    if (typeof thing !== 'object') {
        throw new Error('not an object');
    }

    if (thing === null) {
        throw new Error('not an object');
    }

    // WORKS
    const obj: object = thing;
}

So... TypeScript does not understand an or operator "||" to test twp things in the same if()?

[lll000111]

Okay... so I found that the order of the individual tests matters, which is just as strange so I see no reason to close the issue.

Playground link

function demoV1(thing: unknown): void {
    if (typeof thing !== 'object' || thing === null) {
        throw new Error('not an object');
    }

    // WORKS
    const obj: object = thing;
}

function demoV2(thing: unknown): void {
    if (thing === null) {
        throw new Error('not an object');
    }

    if (typeof thing !== 'object') {
        throw new Error('not an object');
    }

     // ERROR: thing is object || null
    const obj: object = thing;
}

[jack-williams]

Duplicate of #28131