@shopify/jest-dom-mocks/build/cjs/match-media.js

Jest mocking utilities for working with the DOM

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

class MatchMedia {
  constructor() {
    this.originalMatchMedia = null;
  }
  mock(media = defaultMatcher) {
    if (this.originalMatchMedia !== null) {
      throw new Error('You tried to mock window.matchMedia when it was already mocked.');
    }
    this.originalMatchMedia = window.matchMedia;
    this.setMedia(media);
  }
  restore() {
    if (this.originalMatchMedia === null) {
      throw new Error('You tried to restore window.matchMedia when it was already restored.');
    }
    window.matchMedia = this.originalMatchMedia;
    this.originalMatchMedia = null;
  }
  isMocked() {
    return this.originalMatchMedia !== null;
  }
  setMedia(media = defaultMatcher) {
    this.ensureMatchMediaIsMocked();
    window.matchMedia = query => mediaQueryList(media(query));
  }
  ensureMatchMediaIsMocked() {
    if (this.originalMatchMedia === null) {
      throw new Error('You must call matchMedia.mock() before interacting with the mock matchMedia.');
    }
  }
}
function defaultMatcher() {
  return {
    media: '',
    addListener: noop,
    addEventListener: noop,
    removeListener: noop,
    removeEventListener: noop,
    onchange: noop,
    dispatchEvent: () => false,
    matches: false
  };
}
function mediaQueryList(values) {
  // Explictly state a return type as TypeScript does not attempt to shrink the
  // type when using Object spread. Without the explicit return type TypeScript
  // exports a type that exposes the internals of `MediaQueryList` (which
  // changed in TS 3.1.0).
  // This ensures that this function can be used in projects that use any
  // version of Typescript instead of only <3.1.0 or >= 3.1.0 depending on the
  // version that this library was compiled using.
  return {
    ...defaultMatcher(),
    ...values
  };
}
function noop() {}

exports["default"] = MatchMedia;
exports.mediaQueryList = mediaQueryList;