What is the correct way to create a constructor in TypeScript?
I have been researching and trying different approaches, but it seems like the syntax has changed. Here is my latest attempt:
declare class Car {
constructor(public engine: string) {
this.engine = engine + "foo";
}
}
An implementation cannot be called in ambient contexts.
When you use declare, you are essentially defining a class type without any implementation. It is necessary to remove the declare in order for the code to compile correctly.
class Car {
constructor(public engine: string) {
this.engine = engine + "foo";
}
}
However, after compilation, the code looks like this:
var Car = (function () {
function Car(engine) {
this.engine = engine;
this.engine = engine + "foo";
}
return Car;
})();
This results in setting the engine property twice, which may not be your intended behavior. The engine property should be defined on the class rather than within the constructor.
class Car {
public engine: string;
constructor(engine: string) {
this.engine = engine + "foo";
}
}
Edit:
If you received an error about needing to use declare, it might be because of the .d.ts extension used for definition files. For proper JavaScript compilation, consider using just the .ts extension.
Edit 2:
declare class Car {
public engine;
constructor(engine: string);
}
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