prescientmoon/moonythm
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Tight -> narrow

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prescientmoon 2025-06-19 13:36:45 +02:00
parent 1aa6356e14
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content/echoes/ts-array-variance-standup.dj
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@ -69,7 +69,7 @@ const nums: number[] = [0]
nums.push("oops") // type error!
```
The issue is that (informally), at every point, TypeScript keeps track of the tightest type possible for the variables involved. That is, `nums` has type `number[]`, hence the type mismatch. Still, we can guide TypeScript into widening said "tightest type" with a type annotation, thus recreating the bug without any new functions:
The issue is that (informally), at every point, TypeScript keeps track of the most narrow type possible for the variables involved. That is, `nums` has type `number[]`, hence the type mismatch. Still, we can guide TypeScript into widening said "most narrow type" with a type annotation, thus recreating the bug without any new functions:
```ts
const nums: number[] = [0]