maxEntries support

README.md

@@ -31,6 +31,8 @@ which will be passed into `AxiosHarTracker` constructor:
 ```js
 const axiosTracker = new AxiosHarTracker(axios);
 ```
+The constructor takes an optional second object for creator configuration and an optional third argument ```maxEntries```, which will prevent
+the log from growing beyond that size.
 
 In order to perform an actual request use the axios.get/post/delete... call, examples:
 

src/axios-har-tracker.ts

@@ -42,15 +42,18 @@ export class AxiosHarTracker {
   private generatedHar: HarFile;
   private newEntry: NewEntry;
   private creatorConfig: AxiosHarTrackerCreatorConfig;
+  private maxEntries: number;
 
   constructor(
     axiosModule: AxiosInstance,
     creatorConfig: AxiosHarTrackerCreatorConfig = {
       name: "axios-har-tracker",
       version: "0.1.0",
-    }
+    },
+    maxEntries?:number
   ) {
     this.axios = axiosModule;
+    this.maxEntries = maxEntries;
     this.creatorConfig = creatorConfig;
     this.resetHar();
 
@@ -64,6 +67,7 @@ export class AxiosHarTracker {
         if (error.request) {
           this.newEntry.request = this.returnRequestObject(error.request);
           this.generatedHar.log.entries.push(this.newEntry);
+          this.pruneLog();
         }
         return Promise.reject(error);
       }
@@ -163,6 +167,13 @@ export class AxiosHarTracker {
   private pushNewEntryResponse(response) {
     this.newEntry.response = this.returnResponseObject(response);
     this.generatedHar.log.entries.push(this.newEntry);
+    this.pruneLog();
+  }
+
+  private pruneLog() {
+    if (this.maxEntries !== undefined && this.generatedHar.log.entries?.length > this.maxEntries) {
+     this.generatedHar.log.entries.shift();
+    }
   }
 
   private generateNewEntry() {

src/tests/multiple-calls.spec.ts

@@ -102,7 +102,17 @@ describe("axios-har-tracker e2e tests", () => {
     await fse.writeJson("./harfiles/example-500.har", generatedHar);
   });
 
-  it("Should collect multiple calls", async () => {
+  it("Should collect multiple calls up to a max of 4", async () => {
+
+    axiosTracker = new AxiosHarTracker(axios, undefined, 4);
+
+    //This one will get pruned
+    await axios.get("http://httpstat.us/200", {
+      params: {
+        test: 1,
+      },
+    });
+
     await axios.get("http://httpstat.us/200");
     try {
       await axios.get("http://httpstat.us/302");
@@ -125,8 +135,13 @@ describe("axios-har-tracker e2e tests", () => {
         "An expected error appears after call to http://httpstat.us/500"
       );
     }
+
     const generatedHar = axiosTracker.getGeneratedHar();
     const array = generatedHar.log.entries;
+
+    //5 requests were made but maxEntries is 4
+    expect(array.length).toEqual(4);
+
     expect(array[0].request).toMatchObject({
       method: "get",
       url: "http://httpstat.us/200",