Repository navigation
Refinement of object works and it doesn't #32301
Description
I created a few tiny examples, one per demo function:
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()?
Activity
lll000111 commentedon Jul 8, 2019
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
jack-williams commentedon Jul 8, 2019
Duplicate of #28131