class Some<AttributeType = {
bar: string
}> {
foo(attrs: AttributeType) {
if (attrs.bar) {
console.log(attrs.bar)
}
}
}
Unable to run TypeScript code due to a specific error message:
Property 'bar' does not exist on type 'AttributeType'.
To enhance your code, try implementing the extends keyword instead of using =:
class Some<AttributeType extends { bar: string }>
You can find more information on this topic (here in TypeScript generic constraints document).
When you use the = syntax, you are providing a default generic parameter which limits the flexibility of your class usage like so:
let x: Some;
If you want to avoid this restriction, defining a constraint is necessary for ensuring that your generic type always includes the bar field.
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