Use get-tsconfig to parse resolved tsconfigs

Author: peschee

package-lock.json

@@ -60,6 +60,7 @@
     "@mdn/browser-compat-data": "^4.0.0",
     "@web/dev-server-core": "^0.7.0",
     "esbuild": "^0.19.11",
+    "get-tsconfig": "^4.7.2",
     "parse5": "^6.0.1",
     "ua-parser-js": "^1.0.33"
   },

package.json

@@ -18,6 +18,7 @@ import {
   setTextContent,
 } from '@web/dev-server-core/dist/dom5';
 import { parse as parseHtml, serialize as serializeHtml } from 'parse5';
+import { parseTsconfig } from 'get-tsconfig';
 
 import { getEsbuildTarget } from './getEsbuildTarget.js';
 
@@ -61,7 +62,8 @@ export class EsbuildPlugin implements Plugin {
     this.config = config;
     this.logger = logger;
     if (this.esbuildConfig.tsconfig) {
-      this.tsconfigRaw = await promisify(fs.readFile)(this.esbuildConfig.tsconfig, 'utf8');
+      const parsedTsconfig = await parseTsconfig(this.esbuildConfig.tsconfig);     
+      this.tsconfigRaw = parsedTsconfig ? JSON.stringify(parsedTsconfig) : await promisify(fs.readFile)(this.esbuildConfig.tsconfig, 'utf8');
     }
   }