allow custom tsconfig file (#14)

Author: Akumzy

package-lock.json

@@ -33,5 +33,8 @@
   },
   "peerDependencies": {
     "typescript": "*"
+  },
+  "prettier":{
+    "semi": true
   }
 }

package.json

@@ -1,5 +1,6 @@
 export type Config = Partial<{
   outDir: string;
+  tsConfigFile?: string;
   esbuild: {
     entryPoints?: string[];
     minify?: boolean;

src/config.ts

@@ -9,12 +9,8 @@ import { Config, readUserConfig } from "./config";
 
 const cwd = process.cwd();
 
-function getTSConfig() {
-  const tsConfigFile = ts.findConfigFile(
-    cwd,
-    ts.sys.fileExists,
-    "tsconfig.json"
-  );
+function getTSConfig(_tsConfigFile = "tsconfig.json") {
+  const tsConfigFile = ts.findConfigFile(cwd, ts.sys.fileExists, _tsConfigFile);
   if (!tsConfigFile) {
     throw new Error(`tsconfig.json not found in the current directory! ${cwd}`);
   }
@@ -50,7 +46,7 @@ function esBuildSourceMapOptions(tsConfig: TSConfig) {
 }
 
 function getBuildMetadata(userConfig: Config) {
-  const { tsConfig, tsConfigFile } = getTSConfig();
+  const { tsConfig, tsConfigFile } = getTSConfig(userConfig.tsConfigFile);
 
   const outDir = userConfig.outDir || tsConfig.options.outDir || "dist";