TS fails to recognize any additional properties added to the constant object

When working on a function that should return an object with properties 'a' and 'b', I am defining the object first and then adding values to it later:

const result = {};
result.a = 1;
result.b = 2;
return result;

However, TypeScript is showing me the following error message:

Type '{}' is missing the following properties from type 'Output': a, b ts(2739)

I believe TypeScript should understand that I will be adding the required fields to the constant object while the function is executing.

Answer №1

At runtime, the TypeScript compiler does not take into account any additional properties that are added. To work around this issue, you can use the as keyword like this:

const result = {} as { x: string, y: number };

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