I'm troubleshooting an issue with my code:
class Base<T> {}
class Test {
prop: Base<any>;
createProp<T>() {
this.prop = new Base<T>();
}
}
const test = new Test();
test.createProp<{ a: number }>();
test.prop // Base<any> expected Base<{ a: number }>
After calling the createProp method with the generic parameter, the type of the prop property should be updated to the new type. However, currently, it remains as Base<any>. Is there a way to achieve this using TypeScript?
prop is specified as Base<any>, ensuring it will always remain a Base<any> even if assigned with a different type.
To achieve this behavior, it is necessary to make the class generic rather than just the method:
class Base<T> {}
class Test<T> {
prop: Base<T>;
createProp() {
this.prop = new Base<T>();
}
}
const test = new Test<{ a: number }>();
test.createProp();
test.prop
On the other hand, if one strongly prefers not to use a generic class, a type assertion can be applied instead:
class Base<T> {}
class Test {
prop: Base<any>;
createProp<T>() {
this.prop = new Base<T>();
}
}
const test = new Test();
test.createProp<{ a: number }>();
test.prop as Base<{ a: number }>
// --- or ---
<Base<{ a: number }>> test.prop
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