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Solution for the error "Function implementation is missing or not immediately following the declaration" - LearnShareIT

Solution for the error “Function implementation is missing or not immediately following the declaration”

This article discusses TypeScript’s error “Function implementation is missing or not immediately following the declaration”. To fix this problem, you need to correct the syntax errors in the program or add the function implementation. Check out the information below for detailed instructions.

Why does this error occur?

You will receive the error message: “Function implementation is missing or not immediately following the declaration” in TypeScript when you make a syntax error or declare a function without an implementation.

Let’s see the examples below of some typical cases that cause this error.

The first case is due to not declaring any methods in advance but writing code directly in the body of the class.

class Student {
    console.log('Student information');
}

Missing the implementation of the function can also cause errors.

function monthlySalary(base: number, coff: number, bonus: number): number;

The last case is because of declaring a method in an abstract class without its implementation.

abstract class Staff {
    abstract baseSalary: number;
    abstract coefficient: number;
    increaseSalary(): number;
}

Error:

Function implementation is missing or not immediately following the declaration.

Solved – Function implementation is missing or not immediately following the declaration

To work around this problem, you need to correct the syntax errors in the program or provide an implementation for the function.

Let’s see for each specific case how we can solve this error.

In the first situation, we must declare at least one method for the class, then do the code inside that method.

class Student {
    studentName: string;
    studentID: string;

    constructor(name: string, id: string) {
        this.studentName = name;
        this.studentID = id;
    }

    getInfor() {
        console.log("Student information");
        console.log("Name: " + this.studentName);
        console.log("ID: " + this.studentID);
    }
}

const student = new Student("Julian", "20221281");
student.getInfor();

Output:

Student information
Name: Julian
ID: 20221281

As you can see, the error no longer occurs after moving the code inside the method to process.

In the next case, we need to add the function implementation to eliminate the error.

function monthlySalary(base: number, coff: number, bonus: number): number {
    return base * coff + bonus;
}

console.log(monthlySalary(3000, 1.8, 500));

Output:

5900

You can do the same with the last case as in the second example.

abstract class Staff {
    abstract baseSalary: number;
    abstract coefficient: number;
    abstract bonus: number;

    increaseSalary(): number {
        return this.baseSalary * this.coefficient + this.bonus;
    }
}

Alternatively, you can convert that method to an abstract method:

abstract class Staff {
    abstract baseSalary: number;
    abstract coefficient: number;
    abstract bonus: number;
    abstract increaseSalary(): number;
}

Summary

To sum up, we just explained to you what causes the error “Function implementation is missing or not immediately following the declaration” in TypeScript. To fix this problem, you need to correct the syntax errors in the program or add the function implementation. Hopefully, this article will be helpful to you.

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