MergedObject is a container that can store multiple MyClass instances as key-value pairs, where the key represents the variable name (e.g. Obj1) and the value is the corresponding MyClass instance. How can I define a type annotation for MergedObject?
class MyClass {
a: string;
constructor(a: string) {
this.a = a
}
}
const Obj1 = new MyClass('one')
const Obj2 = new MyClass('two')
const MergedObject = {
Obj1,
Obj2
}
When the contents of MergedObject are subject to change, treating it as you would a Map by actually utilizing a Map (specifically, a Map<string, MyClass>) might be a more suitable approach:
const MergedObject = new Map<string, MyClass>(
Object.entries({
Obj1,
Obj2,
})
);
If the content within does not change over time and remains static, there is no necessity for a type annotation; TypeScript will infer the type accurately from the initialization block:
const MergedObject = {
Obj1,
Obj2,
};
This choice also offers the added benefit of having strongly-typed keys (
"Obj1" | "Obj2"string). However, if flexibility is desired, one could opt for Record<string, MyClass>.
One option for type annotation is to use an object with a string index signature that contains MyClass values.
const MergedObject: Record<string, MyClass> = {
Obj1, Obj2
}
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