[ZETA-6483]: add dependency type logic (#10)

* ZETA-6483: Add more unit tests.

* ZETA-6483: Wire up dependency type.

Author: CharlieGreenman

src/npm/npm-install/npm-install.ts

@@ -1,3 +1,4 @@
+import { determineDependencyType } from "../../utils/dependency-type/dependency-type";
 import { extractPackageName } from "../../utils/command-search/command-search";
 import { getNameAndVersion } from "../../utils/version/version";
 import {morphCode, EditInput} from "@codemorph/core";
@@ -7,6 +8,7 @@ export async function npmInstallCodemorph(commandText: string, packageJsonString
   const {name, version} = await getNameAndVersion(packageName);
   const packageJsonParsed = JSON.parse(packageJsonString);
   const packageJsonDependencies = packageJsonParsed && packageJsonParsed.dependencies;
+  const dependencyType = determineDependencyType(commandText);
 
   const editInput: EditInput = {
     fileType: 'json',
@@ -15,7 +17,7 @@ export async function npmInstallCodemorph(commandText: string, packageJsonString
     edits: [
       {
         nodeType: 'editJson' as any,
-        valueToModify: '/dependencies',
+        valueToModify: `/${dependencyType}`,
         codeBlock: {
           ...packageJsonDependencies,
           [name]: version

src/utils/dependency-type/dependency-type.spec.ts

@@ -0,0 +1,27 @@
+import { determineDependencyType } from "./dependency-type";
+
+describe('determineDependencyType', () => {
+  it('should return dev dependency type based on the command text', () => {
+    const commandText = 'npm install @angular/core react --save-dev';
+    const result = determineDependencyType(commandText);
+    expect(result).toEqual('devDependencies')
+  });
+
+  it('should return dependencies type based on --save flag', () => {
+    const commandText = 'npm install @angular/core react --save';
+    const result = determineDependencyType(commandText);
+    expect(result).toEqual('dependencies');
+  });
+  
+  it('should return optionalDependencies type based on --save-optional flag', () => {
+    const commandText = 'npm install @angular/core react --save-optional';
+    const result = determineDependencyType(commandText);
+    expect(result).toEqual('optionalDependencies');
+  });
+
+  it('should return dependencies if no dependency type', () => {
+    const commandText = 'npm install @angular/core react';
+    const result = determineDependencyType(commandText);
+    expect(result).toEqual('dependencies');
+  });
+});

src/utils/dependency-type/dependency-type.ts

@@ -0,0 +1,22 @@
+export function determineDependencyType(commandText: string): string | undefined {
+  const regexPattern = /--save(-dev|-optional)?/;
+  const match = commandText.match(regexPattern);
+  const saveFlag = match && match[0];
+  if(match) {
+    let saveLocation: string;
+    switch (saveFlag) {    
+      case '--save-dev':
+        saveLocation = 'devDependencies';
+        break;
+      case '--save-optional':
+        saveLocation = 'optionalDependencies';
+        break;
+      default:
+        saveLocation = 'dependencies';
+        break;
+    }
+    return saveLocation;
+  } else {
+    return 'dependencies';
+  }
+}