index-cjs.js

const {
  matcherHint,
  printExpected,
  printReceived,
} = require("jest-matcher-utils");
const getType = require("jest-get-type");

const toBeType = (received, expected) => {
  const type = getType(received);
  const pass = type === expected;
  const message = pass
    ? () =>
        matcherHint(".not.toBeType", "value", "type") +
        "\n\n" +
        `Expected value to be of type:\n` +
        `  ${printExpected(expected)}\n` +
        `Received:\n` +
        `  ${printReceived(received)}\n`
    : () =>
        matcherHint(".toBeType", "value", "type") +
        "\n\n" +
        `Expected value to be of type:\n` +
        `  ${printExpected(expected)}\n` +
        `Received:\n` +
        `  ${printReceived(received)}\n` +
        `type:\n` +
        `  ${printReceived(type)}`;

  return { pass, message };
};

const wrapped = {
  toBeType,
};

const extend = (expect) => {
  expect.extend(wrapped);
};

exports.toBeType = toBeType;
exports.extend = extend;
exports.default = wrapped; // es6 compat
module.exports = wrapped;

// THIS ENABLES 'setupFilesAfterEnv' in jest config file
expect.extend({ toBeType });