react-docx/src/utils/is.js

React Reconciler for DOCX - build Docx with JSX

/// IS helper from
/// https://github.com/react-spring/react-three-fiber
export const is = {
  obj: (a) => a === Object(a) && !is.arr(a),
  fun: (a) => typeof a === "function",
  str: (a) => typeof a === "string",
  num: (a) => typeof a === "number",
  und: (a) => a === void 0,
  arr: (a) => Array.isArray(a),
  equ(a, b) {
    // Wrong type or one of the two undefined, doesn't match
    if (typeof a !== typeof b || !!a !== !!b) return false;
    // Atomic, just compare a against b
    if (is.str(a) || is.num(a) || is.obj(a)) return a === b;
    // Array, shallow compare first to see if it's a match
    // eslint-disable-next-line eqeqeq
    if (is.arr(a) && a == b) return true;
    // Last resort, go through keys
    let i;
    for (i in a) if (!(i in b)) return false;
    for (i in b) if (a[i] !== b[i]) return false;
    return is.und(i) ? a === b : true;
  },
};