plugin.ts

import { Application, IPlugin } from '@phosphor/application';

import { Widget } from '@phosphor/widgets';

import { IJupyterWidgetRegistry } from '@jupyter-widgets/base';

import { MODULE_VERSION, MODULE_NAME } from './version';

const EXTENSION_ID = 'matplotlib-jupyter:main';

/**
 * The plugin.
 */
const jupyterMatplotlibPlugin: IPlugin<Application<Widget>, void> = {
    id: EXTENSION_ID,
    requires: [IJupyterWidgetRegistry],
    activate: activateWidgetExtension,
    autoStart: true,
} as unknown as IPlugin<Application<Widget>, void>;
// the "as unknown as ..." typecast above is solely to support JupyterLab 1
// and 2 in the same codebase and should be removed when we migrate to Lumino.

export default jupyterMatplotlibPlugin;

/**
 * Activate the widget extension.
 */
function activateWidgetExtension(
    app: Application<Widget>,
    registry: IJupyterWidgetRegistry,
): void {
    registry.registerWidget({
        name: MODULE_NAME,
        version: MODULE_VERSION,
        exports: (): any => import('./index'),
    });
}