Simplify tsc setup

We don't need to build files to `lib` as jest compiles on the fly during
tests and `ncc` packages the action from typescript.

tsconfig.json

@@ -2,12 +2,12 @@
   "compilerOptions": {
     "target": "es6",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
-    "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,                           /* Enable all strict type-checking options. */
     "noImplicitAny": true,                    /* Raise error on expressions and declarations with an implied 'any' type. */
-    "esModuleInterop": true,                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
-    "moduleResolution": "node"
+    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    "moduleResolution": "node",
+    "noEmit": true,                           /* Do not emit compiler output files as we use ncc to package the action */
+    "forceConsistentCasingInFileNames": true  /* Error if requiring a file by a casing different from the casing on disk */
   },
   "include": ["src/**/*.ts"],
   "exclude": ["**/node_modules/**"]