TypeScript allows specifying the return type of functions:
function delay(ms: number): Promise<void> {
return new Promise( resolve => setTimeout(resolve, ms) )
}
Somewhat frequently, I forget to await a function that returns a Promise:
let waited = 0
while (accessible === false && waited < MAX_DELAY) {
waited += DELAY_MS
delay(DELAY_MS) // oh no, this won't work correctly
accessible = await this.dbAccessible()
}
TypeScript (tsserver) does warn me if I await an expression that isn't a promise
'await' has no effect on the type of this expression
Can I make tsserver (or something else, like a linter) warn me if I fail to await an expression that is a promise? I know this is sometimes valid (and I have used it), but it's less common in my experience than forgetting to await a promise that I meant to await.