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https://github.com/thelounge/thelounge
synced 2024-11-15 00:37:13 +00:00
fd14b4a172
TS type assertions need to be avoided.
The following trivial example demonstrates why
```
type Person = {
name: string;
isBad: boolean;
};
function makePerson(): Person {
const p: Person = {name: 'whatever'} as Person
p.isBad = false
return p // theoretically we are now good, p is a Person
}
```
Should the type ever change though, TS will happily trot along
```
type Person = {
name: string;
isBad: boolean;
omgHowCouldYou: number;
};
function makePerson(): Person {
const p: Person = {name: 'whatever'} as Person
p.isBad = true
return p // p is *not* a Person, omgHowCouldYou is missing
}
```
But we pinky swore to the compiler that p is in fact a Person.
In other words, the types are now wrong and you will fail during
runtime.
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|---|---|---|
| .. | ||
| command-line | ||
| models | ||
| plugins | ||
| types | ||
| client.ts | ||
| clientManager.ts | ||
| config.ts | ||
| helper.ts | ||
| identification.ts | ||
| index.d.ts | ||
| index.ts | ||
| log.ts | ||
| server.ts | ||
| tsconfig.json | ||