in src/tms_service.ts [353:361]
async getSpriteSheetJsonPath(isRetina: boolean = false): Promise<string> {
const spriteSheetRootPath = await this._getSpriteSheetRootPath();
if (spriteSheetRootPath) {
const suffix = isRetina ? '@2x' : '';
return spriteSheetRootPath + suffix + '.json';
} else {
return '';
}
}