init the awkward code

static/html/jspaint/cypress/plugins/index.js

@@ -0,0 +1,11 @@
+// This function is called when a project is opened or re-opened (e.g. due to
+// the project's config changing)
+
+const {
+	addMatchImageSnapshotPlugin,
+} = require("cypress-image-snapshot/plugin");
+module.exports = (on, config) => {
+	// `on` is used to hook into various events Cypress emits
+	// `config` is the resolved Cypress config
+	addMatchImageSnapshotPlugin(on, config);
+};