TypeScript class method returning this type but causing implementing method chaining
I'm sure I'm missing something obvious here, but I'm working with an scenario with method chaining in my TypeScript class. I have a class `Calculator` where I'm trying to implement fluent interfaces. My methods are supposed to return `this`, but when I chain them, I'm getting unexpected results. Here's a simplified version of my code: ```typescript class Calculator { private value: number; constructor() { this.value = 0; } public add(num: number): this { this.value += num; return this; } public subtract(num: number): this { this.value -= num; return this; } public multiply(num: number): this { this.value *= num; return this; } public getValue(): number { return this.value; } } const calc = new Calculator(); const result = calc.add(5).subtract(3).multiply(2).getValue(); console.log(result); // Expected output: 4 ``` However, when I run this code, I get the output as `0` instead of `4`. I've tried debugging by checking the value after each operation, but it seems that the `value` is never updated in the method chain. I also ensured that the return type for each method is `this`, but it doesn’t seem to help. I’m using TypeScript version 4.4.3. Any thoughts on what might be going wrong here? Could it be an scenario with how TypeScript handles the `this` type in chained methods? Any help would be greatly appreciated!