Fix Help flag issue

src/__tests__/unit/util/args.test.ts

@@ -146,7 +146,7 @@ describe('util/args: ', () => {
       const result = parseArgs();
 
       expect(info).toHaveBeenCalledWith(HELP);
-      expect(result).toEqual(undefined);
+      expect(result).toEqual({});
     });
 
     it('returns manifest and output path.', () => {

src/index.ts

@@ -24,9 +24,13 @@ const impactEngine = async () => {
   const options = parseArgs();
 
   if (options) {
+    if (Object.keys(options).length === 0) {
+      return;
+    }
+
     const {inputPath, outputPath, paramPath} = options;
 
-    const {tree, context, parameters} = await load(inputPath, paramPath);
+    const {tree, context, parameters} = await load(inputPath!, paramPath);
     parameterize.combine(context.params, parameters);
     const pluginStorage = await initalize(context.initialize.plugins);
     const computedTree = await compute(tree, {context, pluginStorage});

src/types/process-args.ts

@@ -4,3 +4,9 @@ export interface ManifestProcessArgs {
   'override-params'?: string;
   help?: boolean;
 }
+
+export interface ProcessArgsOutputs {
+  inputPath?: string;
+  outputPath?: string;
+  paramPath?: string;
+}

src/util/args.ts

@@ -6,7 +6,7 @@ import {ERRORS} from './errors';
 
 import {CONFIG, STRINGS} from '../config';
 
-import {ManifestProcessArgs} from '../types/process-args';
+import {ManifestProcessArgs, ProcessArgsOutputs} from '../types/process-args';
 
 const {CliInputError} = ERRORS;
 
@@ -50,7 +50,7 @@ const prependFullFilePath = (filePath: string) => {
  *    If it is, then returns object containing full path.
  * 4. If params are missing or invalid, then rejects with `CliInputError`.
  */
-export const parseArgs = () => {
+export const parseArgs = (): ProcessArgsOutputs => {
   const {
     manifest,
     output,
@@ -60,7 +60,7 @@ export const parseArgs = () => {
 
   if (help) {
     console.info(HELP);
-    return;
+    return {};
   }
 
   if (manifest) {