Below is my simplified TypeScript code snippet:
interface TimeoutOption {
category: 'timeout'
time: number
}
interface UserOption {
category: Parameters<typeof addEventListener>[0]
}
type MyDelayOptions = Array<TimeoutOption | UserOption>
function delay(options: MyDelayOptions) {
for (const option of options) {
if (option.category === 'timeout') {
timeout = setTimeout(() => {
// not relevant
}, option.time) // need to cast and do (option as TimeoutOption) to not get an error
}
}
}
To prevent a compilation error, I am currently using the type assertion mentioned in the comment. However, it should be clear to humans that if the category is 'timeout', then the option is of type TimeoutOption. How can I modify this without the need for a type assertion? Any suggestions for complete refactorings are appreciated.