unify typescript version and rollup plugins (#921)

packages/rrweb-player/rollup.config.js

@@ -5,7 +5,7 @@ import livereload from 'rollup-plugin-livereload';
 import { terser } from 'rollup-plugin-terser';
 import sveltePreprocess from 'svelte-preprocess';
 import webWorkerLoader from 'rollup-plugin-web-worker-loader';
-import typescript from '@rollup/plugin-typescript';
+import typescript from 'rollup-plugin-typescript2';
 import pkg from './package.json';
 import css from 'rollup-plugin-css-only';
 
@@ -64,6 +64,7 @@ export default entries.map((output) => ({
     resolve({
       browser: true,
       dedupe: ['svelte'],
+      extensions: ['.js', '.ts', '.svelte'],
     }),
 
     commonjs(),