一行で書けた。暗号みたいだが。
uniqueId = ((i) -> -> i++)(0)
console.log uniqueId()
console.log uniqueId()
console.log uniqueId()
console.log uniqueId()
console.log uniqueId()
もちろん、TypeScriptでも可。
typescript
var uniqueId = (i => () => i++)(0);
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