Use rollup for bundling.

package.json

@@ -4,15 +4,20 @@
   "description": "This is a sample plugin for Obsidian (https://obsidian.md)",
   "main": "main.js",
   "scripts": {
-    "dev": "tsc --project tsconfig.json -w",
-    "build": "tsc --project tsconfig.json"
+    "dev": "rollup --config rollup.config.js -w",
+    "build": "rollup --config rollup.config.js"
   },
   "keywords": [],
   "author": "",
   "license": "MIT",
   "devDependencies": {
-    "obsidian": "https://github.com/obsidianmd/obsidian-api/tarball/master",
+    "@rollup/plugin-commonjs": "^15.1.0",
+    "@rollup/plugin-node-resolve": "^9.0.0",
+    "@rollup/plugin-typescript": "^6.0.0",
     "@types/node": "^14.14.2",
+    "obsidian": "https://github.com/obsidianmd/obsidian-api/tarball/master",
+    "rollup": "^2.32.1",
+    "tslib": "^2.0.3",
     "typescript": "^4.0.3"
   }
 }

rollup.config.js

@@ -0,0 +1,19 @@
+import typescript from '@rollup/plugin-typescript';
+import {nodeResolve} from '@rollup/plugin-node-resolve';
+import commonjs from '@rollup/plugin-commonjs';
+
+export default {
+  input: 'main.ts',
+  output: {
+    dir: '.',
+    sourcemap: 'inline',
+    format: 'cjs',
+    exports: 'default'
+  },
+  external: ['obsidian'],
+  plugins: [
+    typescript(),
+    nodeResolve({browser: true}),
+    commonjs(),
+  ]
+};

tsconfig.json

@@ -3,11 +3,12 @@
     "baseUrl": ".",
     "inlineSourceMap": true,
     "inlineSources": true,
-    "module": "CommonJS",
+    "module": "ESNext",
     "target": "es5",
     "allowJs": true,
     "noImplicitAny": true,
     "moduleResolution": "node",
+    "importHelpers": true,
     "lib": [
       "dom",
       "es5",