src/vs/editor/browser/viewParts/minimap/minimapPreBaked.ts/decodeData
const decodeData = (str: string) => {
	const output = new Uint8ClampedArray(str.length / 2);
	for (let i = 0; i < str.length; i += 2) {
		output[i >> 1] = (charTable[str[i]] << 4) | (charTable[str[i + 1]] & 0xF);
	}

	return output;
};