Type guard against 'unknown' fails to narrow down to 'object' when using an if statement with the OR condition

[wil93]

TypeScript Version: 3.9.2

Search Terms: null object unknown

Code

declare const data: unknown;

if (data === null || typeof data !== 'object') {
    throw Error();
}

data;

Expected behavior: the 'data' const should be of type object.

Actual behavior: the 'data' const is recognized as type object | null.

Notice that if I split the above condition into two separate if statements, then it works as expected.

Playground Link:

Version showcasing the bug: https://www.typescriptlang.org/play/#code/CYUwxgNghgTiAEYD2A7AzgF3sKGoC54BXFAaxSQHcUBuAKDoEsAzeAChz3gF5f4UiECPAA+I+BgCeABxBJWnKPACEfAORIARgCtwGNQEp4AbzrxzEgBYwq8AKIwbMNgfoBfBoppA

And here's the (working) version with separate if statements: https://www.typescriptlang.org/play/#code/CYUwxgNghgTiAEYD2A7AzgF3sKGoC54BXFAaxSQHcUBuAKDoEsAzeACgwE8AHEJVnHngBCALyj4AciQAjAFbgMkgJTwA3nXhb4GABYwq8AKIwDMNsvoBfBi3aCo8cRJREIEVRu079hk2YtrBgcaIA

Related Issues: none found

[jack-williams]

This is a duplicate of #28131, just with the logic negated.

[wil93]

Right, it's the same issue.