Function load

packages/melonjs/src/loader/loader.js:538–598

(asset, onload, onerror)

 * @category Assets
 */
export function load(asset, onload, onerror) {
	// make sure all parsers have been initialized
	if (parserInitialized === false) {
		initParsers();
	}

	// strip url() wrapper for fontface assets so baseURL can be prepended to the raw path
	if (asset.type === "fontface" && typeof asset.src === "string") {
		const urlMatch = asset.src.match(/^url\(\s*['"]?(.*?)['"]?\s*\)$/);
		if (urlMatch) {
			asset.src = urlMatch[1];
		}
	}

	// transform the url if necessary (skip for local() font sources and data URIs)
	if (
		typeof baseURL[asset.type] !== "undefined" &&
		typeof asset.src === "string" &&
		!asset.src.startsWith("local(") &&
		!asset.src.startsWith("data:")
	) {
		asset.src = baseURL[asset.type] + asset.src;
	}

	const parser = parsers.get(asset.type);

	if (typeof parser === "undefined") {
		throw new Error("load : unknown or invalid resource type : " + asset.type);
	}

	const settings = {
		nocache: nocache,
		crossOrigin: crossOrigin,
		withCredentials: withCredentials,
	};

	// Promise form: with no callbacks, resolve once the asset (and any
	// sub-resources) have loaded — for a one-off `await loader.load(asset)`.
	// The legacy callback form below still returns the resource count.
	if (onload === undefined && onerror === undefined) {
		return new Promise((resolve, reject) => {
			// parser returns the amount of asset to be loaded (usually 1, more
			// if it splits into several); 0 means already cached → resolve now.
			const count = parser.call(
				this,
				asset,
				() => {
					resolve();
				},
				reject,
				settings,
			);
			if (count === 0) {
				resolve();
			}
		});
	}