Fix build steps

Author: pjquirk

.gitignore

@@ -1 +1,3 @@
-node_modules
+.DS_Store
+node_modules/
+lib/

package.json

@@ -37,7 +37,8 @@
   "main": "dist/index.js",
   "private": true,
   "scripts": {
-    "build": "ncc build src/main.ts",
+    "build": "tsc",
+    "pack": "ncc build",
     "test": "jest"
   }
 }

tsconfig.json

@@ -2,6 +2,8 @@
   "compilerOptions": {
     "target": "es2018",
     "moduleResolution": "node",
+    "outDir": "./lib",                        /* Redirect output structure to the directory. */
+    "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
     "strict": true,
     "forceConsistentCasingInFileNames": true
   },