Error message: The type 'string' in Typescript is not compatible with the specified type

When attempting to split a number value after converting it into a string, I encountered an error message stating: "Type ‘string’ is not assignable to type ‘number’".

Here is the code snippet causing the issue:

export const roundWithPrecision = (
  value: number,
  decimalPrecision: number,
): number => {
  let valueString: string | number = value
  let valueSplit = valueString.toString().split('')
  return valueSplit;
};

Answer №1

It seems like there may be an issue with the return type of the function - instead of returning a number as expected, it is returning a string.

export const roundWithPrecision = (
  value: number,
  decimalPrecision: number,
): number => {
  let valueString: string | number = value
  let valueSplit = valueString.toString().split('')
  return valueSplit*1;
};

Alternatively,

export const roundWithPrecision = (
  value: number,
  decimalPrecision: number,
): string => {
  let valueString: string | number = value
  let valueSplit = valueString.toString().split('')
  return valueSplit;
};

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