Add type annotations (#562)

pyscriptjs/src/components/pyscript.ts

@@ -5,6 +5,7 @@ import {
     loadedEnvironments,
     mode,
     pyodideLoaded,
+    type Environment,
 } from '../stores';
 import { addClasses, htmlDecode } from '../utils';
 import { BaseEvalElement } from './base';
@@ -12,7 +13,7 @@ import type { PyodideInterface } from '../pyodide';
 
 // Premise used to connect to the first available pyodide interpreter
 let pyodideReadyPromise;
-let environments;
+let environments: Record<Environment['id'], Environment> = {};
 let currentMode;
 
 pyodideLoaded.subscribe(value => {