Maximum call stack size exceeded Error in TypeScript

avatar

Borislav Hadzhiev

Last updated: Mar 15, 2022

banner

Photo from Unsplash

Maximum call stack size exceeded Error in TypeScript #

The "RangeError: Maximum call stack size exceeded" occurs when a function is being called so many times that the invocations exceed the call stack limit. To solve the error, track down the cause or specify a base case that has to be met to exit the recursion.

maximum call stack size exceeded

Here is an example of how the error occurs.

index.ts
class Employee { protected _country = 'Germany'; get country(): string { // ⛔️ Error: RangeError: Maximum call stack size exceeded return this.country; // 👈️ should be this._country } } const emp = new Employee(); console.log(emp.country);

The problem in the code snippet above is that the country getter function keeps calling itself until the invocations exceed the call stack limit.

Here is another example of how the error occurs.

index.ts
function example() { example(); } // ⛔️ Error: RangeError: Maximum call stack size exceeded example();

The most common cause of the error is having a function that keeps calling itself.

To solve the error in the example with the class getter, we have to access the property by prefixing it with an underscore, instead of calling the getter.

index.ts
class Employee { protected _country = 'Germany'; get country(): string { return this._country; } }

To solve the error when working with functions, we have to specify a condition at which the function stops calling itself.

index.ts
let counter = 0; function example(num: number) { if (num < 0) { return; } counter += 1; example(num - 1); } example(3); console.log(counter); // 👉️ 4

This time we check if the function was invoked with a number that is less than 0 on every invocation.

If the number is less than 0, we simply return from the function so we don't exceed the call stack limit.

If the passed-in value is not less than zero, we call the function with the passed in value minus 1, which keeps us moving toward the case where the if check is satisfied.

A recursive function calls itself until a condition is met. If there is no condition to be met in your function, it will call itself until the maximum call stack size is exceeded.

You might also get this error if you have an infinite loop that calls a function somewhere.

index.ts
function sum(a: number, b: number) { return a + b; } while (true) { sum(10, 10); }
Our while loop keeps calling the function and since we don't have a condition that would exit the loop we eventually exceed the call stack limit.

This works in a very similar way to a function calling itself without a base condition. The same would be the case if you were using a for loop.

Here's an example of how to specify a condition that has to be met to exit the loop.

index.ts
function sum(a: number, b: number) { return a + b; } let total = 0; for (let i = 10; i > 0; i--) { total += sum(5, 5); } console.log(total); // 👉️ 100

If the i variable is equal to or less than 0, the condition in the for loop is not satisfied, so we exit the loop.

If you can't track exactly where your error occurs, look at the error message in your browser's console or your terminal (if using Node.js).

maximum call stack size exceeded

The screenshot above shows that the error occurred on line 5 in the index.ts file.

Conclusion #

The "RangeError: Maximum call stack size exceeded" occurs when a function is being called so many times that the invocations exceed the call stack limit. To solve the error, track down the cause or specify a base case that has to be met to exit the recursion.

I wrote a book in which I share everything I know about how to become a better, more efficient programmer.
book cover
You can use the search field on my Home Page to filter through all of my articles.