read-excel-file/modules/types/Integer.js

Read `*.xlsx` files of moderate size in a web browser or on a server.

import InvalidError from './InvalidError.js';
import NumberType from './Number.js';
export default function Integer(value) {
  value = NumberType(value);
  if (!isInteger(value)) {
    throw new InvalidError('not_an_integer');
  }
  return value;
}
export function isInteger(x) {
  // https://stackoverflow.com/questions/14636536/how-to-check-if-a-variable-is-an-integer-in-javascript
  return (x | 0) === x;
}
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