custom_nodes/ComfyUI-Easy-Use/ComfyUI-Easy-Use-Frontend/src/extensions/saveImage.js

import { app, applyTextReplacements } from "@/composable/comfyAPI";

const extraNodes = ["easy imageSave", "easy fullkSampler", "easy kSampler", "easy kSamplerTiled","easy kSamplerInpainting", "easy kSamplerDownscaleUnet", "easy kSamplerSDTurbo","easy detailerFix"]

app.registerExtension({
    name: "Comfy.EasyUse.SaveImageExtraOutput",
    async beforeRegisterNodeDef(nodeType, nodeData, app) {
        if (extraNodes.includes(nodeData.name)) {
            const onNodeCreated = nodeType.prototype.onNodeCreated;
            // When the SaveImage node is created we want to override the serialization of the output name widget to run our S&R
            nodeType.prototype.onNodeCreated = function () {
                const r = onNodeCreated ? onNodeCreated.apply(this, arguments) : undefined;

                const widget = this.widgets.find((w) => w.name === "filename_prefix" || w.name === 'save_prefix');
                widget.serializeValue = () => {
                    return applyTextReplacements(app, widget.value);
                };

                return r;
            };
        } else {
            // When any other node is created add a property to alias the node
            const onNodeCreated = nodeType.prototype.onNodeCreated;
            nodeType.prototype.onNodeCreated = function () {
                const r = onNodeCreated ? onNodeCreated.apply(this, arguments) : undefined;

                if (!this.properties || !("Node name for S&R" in this.properties)) {
                    this.addProperty("Node name for S&R", this.constructor.type, "string");
                }

                return r;
            };
        }
    },
});