jest-canvas-mock/lib/classes/ImageData.js

Mock a canvas in your jest tests.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
function _defineProperty(e, r, t) { return (r = _toPropertyKey(r)) in e ? Object.defineProperty(e, r, { value: t, enumerable: !0, configurable: !0, writable: !0 }) : e[r] = t, e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == typeof i ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != typeof t || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != typeof i) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
class ImageData {
  get width() {
    return this._width;
  }
  get height() {
    return this._height;
  }
  get data() {
    return this._data;
  }
  constructor(arr, w, h) {
    _defineProperty(this, "_width", 0);
    _defineProperty(this, "_height", 0);
    _defineProperty(this, "_data", null);
    if (arguments.length === 2) {
      if (arr instanceof Uint8ClampedArray) {
        if (arr.length === 0) throw new RangeError('Source length must be a positive multiple of 4.');
        if (arr.length % 4 !== 0) throw new RangeError('Source length must be a positive multiple of 4.');
        if (!Number.isFinite(w)) throw new RangeError('The width is zero or not a number.');
        if (w === 0) throw new RangeError('The width is zero or not a number.');
        this._width = w;
        this._height = arr.length / 4 / w;
        this._data = arr;
      } else {
        const width = arr;
        const height = w;
        if (!Number.isFinite(height)) throw new RangeError('The height is zero or not a number.');
        if (height === 0) throw new RangeError('The height is zero or not a number.');
        if (!Number.isFinite(width)) throw new RangeError('The width is zero or not a number.');
        if (width === 0) throw new RangeError('The width is zero or not a number.');
        this._width = width;
        this._height = height;
        this._data = new Uint8ClampedArray(width * height * 4);
      }
    } else if (arguments.length === 3) {
      if (!(arr instanceof Uint8ClampedArray)) throw new TypeError('First argument must be a Uint8ClampedArray when using 3 arguments.');
      if (arr.length === 0) throw new RangeError('Source length must be a positive multiple of 4.');
      if (arr.length % 4 !== 0) throw new RangeError('Source length must be a positive multiple of 4.');
      if (!Number.isFinite(h)) throw new RangeError('The height is zero or not a number.');
      if (h === 0) throw new RangeError('The height is zero or not a number.');
      if (!Number.isFinite(w)) throw new RangeError('The width is zero or not a number.');
      if (w === 0) throw new RangeError('The width is zero or not a number.');
      if (arr.length !== w * h * 4) throw new RangeError("Source doesn'n contain the exact number of pixels needed.");
      this._width = w;
      this._height = h;
      this._data = arr;
    } else {
      throw new TypeError('Wrong number of arguments provided.');
    }
  }
}
exports.default = ImageData;