babel-jest-assertions/dist/utils/looks-like.js

Babel plugin that adds the number of assertions found in each test with expect.assertions(n)

const looksLike = (a, b) => {
  return a && b && Object.keys(b).every(bKey => {
    const bVal = b[bKey];
    const aVal = a[bKey];
    if (typeof bVal === 'function') {
      return bVal(aVal);
    }
    return isPrimitive(bVal) ? bVal === aVal : looksLike(aVal, bVal);
  });
};

const isPrimitive = val => val == null || /^[sbn]/.test(typeof val);

module.exports = looksLike;