(0, object.property)() produces TS2695

[dead-claudia]

TypeScript Version: 3.0.0-dev.201xxxxx

Search Terms: Left side of comma operator is unused and has no side effects

(This only brought 7 results in total at the time of writing.)

Code

let list = [() => { }];
(0, list[0])();
let object = {fn: () => { }};
(0, object.fn)();

Expected behavior: It to type-check without errors - this is a common idiom to invoke functions without setting this to the property it's on, and it's fairly broadly used.

Actual behavior: TS2695: Left side of comma operator is unused and has no side effects on both calls

Playground Link: https://www.typescriptlang.org/play/index.html?ssl=3&ssc=11&pln=3&pc=5#code/DYUwLgBMCWDOkF4IG0AUBKCCB8EDeEAvgLoDcAUKgAwA0UcYyVx6GFokA9gEYBWIAY0T4AZgDsAXBAxZcBQoQrU6PfkIB041ulJA

Related Issues: #12978 #33646

[ilogico]

void 0 :)

[ajafff]

Fix is up at #35878

[MattShaile]

Any chance we can get this PR merged?

[shicks]

The PR was dropped because the author seemed to have abandoned it. I'd be willing to push it through if there's interest.