Alternative to TexturePacker (https://www.codeandweb.com/texturepacker)

iPker node module make packages png files from yours multiple sprites to optimise your game, it also give you the json information to unpack the images in game.

npm install ipker

node node_modules/ipker/ipker.js ./path/assets/images

To change some parameters you can add a configuration file named "iPker_conf.json"

{
    "outName" : "game",
    "writeFolderName" : false,
    "outPath" : "./game/assets/images",
    "assetFileMaker" :{
        "outName" : "ASSETS.ts",
        "outPath" : "./game/src/generated",
        "language" : "ts",
        "data" : {
            "module" : "GAME",
            "className" :"ASSETS"
         }
}

All fields are facultative

change the default generated files name "sprite_sheet"

change the images keys names by adding or not the repository name

change the output path for generated files

If you use typescript, ou can generate an extra file containing keys definitions as static constant

/* GENERATED FROM IPKER */
module GAME {
		export  class ASSETS {

				static BAR_EMPTY : string = "bar/empty.png";
				static BAR_FULL : string = "bar/full.png";
				static BAR_LIFE_ICONE : string = "bar/life_icone.png";
        }
}

You can use Ipker without node and npm by downloading an executable version (https://devrocket.itch.io/ipker)

https://devrocket.itch.io/ipker