identifier expected in typescript

In TypeScript, an identifier is a name given to a variable, function, class or any other user-defined item. It is used to identify the item uniquely in the program. An identifier must follow a specific set of rules and guidelines.

To declare an identifier with an expected type in TypeScript, you can use the following syntax:

index.ts
let variableName: expectedType;
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For example, if you want to declare a variable named age with an expected type of number, you would write:

index.ts
let age: number;
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You can then assign a value to the variable later in your code:

index.ts
age = 30;
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Alternatively, you can declare and initialize the variable in one statement:

index.ts
let age: number = 30;
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If you try to assign a value to the variable that is not of the expected type, TypeScript will raise a compilation error. This helps catch type-related errors early on in the development process.