allow configuration file to be specified in the command (#15)

* allow configuration file to be specified in the command

* readme

Author: Yael Brodsky

README.md

@@ -44,7 +44,7 @@ Additionally, you can add it to your build scripts
   "name": "myproject",
   "version": "0.1.0",
   "scripts": {
-    "dev": "etsc" 
+    "dev": "etsc"
   }
 }
 ```
@@ -122,7 +122,15 @@ module.exports = {
 };
 ```
 
-All of the above fields are optional
+All of the above fields are optional.
+
+If you want to use different config files for different types of builds you can do so using the param `--config`. Example:
+
+```
+  "scripts": {
+    "build": "etsc --config=etsc.config.build.js"
+  }
+```
 
 ## License
 

package.json

@@ -24,12 +24,14 @@
   "devDependencies": {
     "@types/node": "^14.6.4",
     "@types/rimraf": "^3.0.0",
+    "@types/yargs": "^16.0.1",
     "typescript": "^4.0.2"
   },
   "dependencies": {
     "cpy": "^8.1.1",
     "esbuild": "^0.8.34",
-    "rimraf": "^3.0.2"
+    "rimraf": "^3.0.2",
+    "yargs": "^16.2.0"
   },
   "peerDependencies": {
     "typescript": "*"

src/index.ts

@@ -5,9 +5,13 @@ import { build } from "esbuild";
 import cpy from "cpy";
 import path from "path";
 import rimraf from "rimraf";
+import yargs from 'yargs/yargs';
+import { hideBin } from 'yargs/helpers';
+import { Argv } from 'yargs';
 import { Config, readUserConfig } from "./config";
 
 const cwd = process.cwd();
+const { argv } = yargs(hideBin(process.argv));
 
 function getTSConfig(_tsConfigFile = "tsconfig.json") {
   const tsConfigFile = ts.findConfigFile(cwd, ts.sys.fileExists, _tsConfigFile);
@@ -104,7 +108,9 @@ async function copyNonSourceFiles({
 }
 
 async function main() {
-  const config = await readUserConfig(path.resolve(cwd, "etsc.config.js"));
+  const configFilename = <string>argv?.config || 'etsc.config.js';
+
+  const config = await readUserConfig(path.resolve(cwd, configFilename));
 
   const { outDir, esbuildOptions, assetsOptions } = getBuildMetadata(config);