joplin/packages/app-desktop/integration-tests/resources/test-plugins/multipleEditorPlugins.js

// Allows referencing the Joplin global:
/* eslint-disable no-undef */

// Allows the `joplin-manifest` block comment:
/* eslint-disable multiline-comment-style */

/* joplin-manifest:
{
	"id": "org.joplinapp.plugins.example.editorPlugin",
	"manifest_version": 1,
	"app_min_version": "3.1",
	"name": "JS Bundle test",
	"description": "JS Bundle Test plugin",
	"version": "1.0.0",
	"author": "",
	"homepage_url": "https://joplinapp.org"
}
*/

const registerEditorPlugin = async (editorViewId) => {
	const editors = joplin.views.editors;
	await editors.register(editorViewId, {
		async onSetup(view) {
			await editors.setHtml(
				view,
				`<div id="frame-summary">
					Editor plugin:
					<code id="view-id-base">${editorViewId}</code>
					for view handle: <code>${encodeURI(view)}</code>
				</div>`,
			);
		},
		async onActivationCheck(_event) {
			// Always enable
			return true;
		},
	});
};

joplin.plugins.register({
	onStart: async function() {
		// Register two different editor plugins:
		await registerEditorPlugin('test-editor-plugin-1');
		await registerEditorPlugin('test-editor-plugin-2');
	},
});