vitest-webgl-canvas-mock/src/mock/createImageBitmap.js

Mock both 2D and WebGL contexts in Vitest.

import { vi } from 'vitest';
import ImageBitmap from '../classes/ImageBitmap.js';

export default vi.fn(function createImageBitmap(img, sx, sy, sWidth, sHeight, options) {
  var length = arguments.length;
  return new Promise((resolve, reject) => {
    if (length === 0) return reject(new TypeError('Failed to execute \'createImageBitmap\' on \'Window\': 1 argument required, but only 0 present.'));
    if (length === 3 || length === 4) return reject(new TypeError('Failed to execute \'createImageBitmap\' on \'Window\': Valid arities are: [1, 2, 5, 6], but ' + length +' arguments provided.'));
    let validImage = false;
    if (img instanceof HTMLImageElement) validImage = true;
    if (img instanceof HTMLVideoElement) validImage = true;
    if (img instanceof HTMLCanvasElement) validImage = true;
    // checking constructor name is the only reliable way to verify the object's constructing class is "blob-like"
    if (img instanceof Blob || (img && img.constructor && img.constructor.name === "Blob")) validImage = true;
    if (img instanceof ImageBitmap) validImage = true;
    if (img instanceof ImageData) validImage = true;
    if (!validImage) return reject(new TypeError('Failed to execute \'createImageBitmap\' on \'Window\': The provided value is not of type \'(HTMLImageElement or SVGImageElement or HTMLVideoElement or HTMLCanvasElement or Blob or ImageData or ImageBitmap or OffscreenCanvas)\''));
    if (length >= 2) {
      let index = 6;
      if (length === 2) {
        index = 2;
        options = sx;
      }
      if (length === 5) options = null;
      if (options !== null && options !== void 0) {
        if (typeof options !== 'object') throw new TypeError('Failed to execute \'createImageBitmap\' on \'Window\': parameter ' + index + ' (\'options\') is not an object.');
      }
    }

    if (length >= 5) {
      sWidth = Number(sWidth);
      sHeight = Number(sHeight);
      if (sWidth === 0 || !Number.isFinite(sWidth)) return reject(new RangeError('The crop rect width is 0.'));
      if (sHeight === 0 || !Number.isFinite(sHeight)) return reject(new RangeError('The crop rect height is 0.'));
      sWidth = Math.abs(sWidth);
      sHeight = Math.abs(sHeight);
    } else {
      sWidth = img.width || 1;
      sHeight = img.height || 1;
    }
    return resolve(new ImageBitmap(sWidth, sHeight));
  });
});