Aseprite/LibreSprite script to export each tag as a spritesheet. Shortcut for doing `File > Export > Export Sprite Sheet` for every tag.

Export all Tags as Spritesheets.lua

local spr = app.sprite
if not spr then return print('No active sprite') end
local path, title = spr.filename:match("^(.+[/\\])(.-).([^.]*)$")

-- PREFERENCES
if not ExportScriptPreferences then
    ExportScriptPreferences = {}
end
if not ExportScriptPreferences[spr.filename] then
    ExportScriptPreferences[spr.filename] = {}
    ExportScriptPreferences[spr.filename].exportPath = "{title}-{tag}.png"
end


-- EXPORT
function Export(exportPath, layer)
    local p = app.fs.filePath(spr.filename)
    for _, tag in ipairs(spr.tags) do
        local subpath = exportPath:gsub('{tag}', tag.name):gsub('{title}', title)
        app.command.ExportSpriteSheet {
            ui = true,
            askOverwrite=true,
            type = SpriteSheetType.HORIZONTAL,
            textureFilename = app.fs.joinPath(p, subpath),
            -- dataFilename = tag .. '.json',
            -- dataFormat = SpriteSheetDataFormat.JSON_ARRAY,
            tag = tag.name,
            layer = layer,
        }
    end
end

-- UI
local data = Dialog { title="Exporter" }
    :entry { id="layer", label="Layer: ", text=app.layer.name }
    :entry { id="exportPath", label="Filename: ", text=ExportScriptPreferences[spr.filename].exportPath }
    :button { id="confirm", text="Save sheets" }
    :button { id="cancel", text="Cancel" }
    :show().data

if data.confirm then
    ExportScriptPreferences[spr.filename].exportPath = data.exportPath
    Export(data.exportPath, data.layer)
end