function blanker (input, start, end) {
    return input.substring(start, end).replace(/[^\n\r]/g, ' ');
}
Setting imports to empty can cause source maps to break.
This is because some imports could span across multiple lines when importing named exports.
To bypass this problem, this function will replace all text except line breaks with spaces.
This will preserve the lines so source maps function correctly.
Source maps are ideally the better way to solve this, but trying to maintain performance.

@param {string} input
@param {number} start
@param {number} end
@return {string}