feat: add the ability to run with '--json' and output the result (#78)

* addition-of-json-flag

* Set output of npn audit

src/audit.ts

@@ -7,7 +7,7 @@ export class Audit {
   stdout = ''
   private status: number | null = null
 
-  public run(auditLevel: string, productionFlag: string): void {
+  public run(auditLevel: string, productionFlag: string, jsonFlag: string): void {
     try {
       const auditOptions: Array<string> = ['audit', '--audit-level', auditLevel]
 
@@ -15,6 +15,10 @@ export class Audit {
         auditOptions.push('--production')
       }
 
+      if (jsonFlag === 'true') {
+        auditOptions.push('--json')
+      }
+
       const result: SpawnSyncReturns<string> = spawnSync('npm', auditOptions, {
         encoding: 'utf-8',
         maxBuffer: SPAWN_PROCESS_BUFFER_SIZE

src/main.ts

@@ -30,10 +30,17 @@ export async function run(): Promise<void> {
       throw new Error('Invalid input: production_flag')
     }
 
+    const jsonFlag = core.getInput('json_flag', {required: false})
+    if (!['true', 'false'].includes(jsonFlag)) {
+      throw new Error('Invalid input: json_flag')
+    }
+
+
     // run `npm audit`
     const audit = new Audit()
-    audit.run(auditLevel, productionFlag)
+    audit.run(auditLevel, productionFlag, jsonFlag)
     core.info(audit.stdout)
+    core.setOutput('npm_audit', audit.stdout);
 
     if (audit.foundVulnerability()) {
       // vulnerabilities are found