@canutin/svelte-currency-input/dist/utils/repositionCursor.js

A fully-featured currency input component for Svelte 5 that handles formatting, localization, and validation

export const repositionCursor = ({ selectionStart, value, lastKeyStroke, stateValue, groupSeparator }) => {
    let cursorPosition = selectionStart;
    let modifiedValue = value;
    if (stateValue && cursorPosition) {
        const splitValue = value.split('');
        if (lastKeyStroke === 'Backspace' && stateValue[cursorPosition] === groupSeparator) {
            splitValue.splice(cursorPosition - 1, 1);
            cursorPosition -= 1;
        }
        if (lastKeyStroke === 'Delete' && stateValue[cursorPosition] === groupSeparator) {
            splitValue.splice(cursorPosition, 1);
            cursorPosition += 1;
        }
        modifiedValue = splitValue.join('');
        return { modifiedValue, cursorPosition };
    }
    return { modifiedValue, cursorPosition: selectionStart };
};