From f846326bb3878eb936e6dc271fdb8491b96ddeb0 Mon Sep 17 00:00:00 2001
From: SuperOleg39 <o.drapeza@tinkoff.ru>
Date: Tue, 21 Feb 2023 04:30:39 +0300
Subject: [PATCH] feat: handle TTFB from web-vitals without transform (#221)

---
 package-lock.json |  4 ++--
 src/observe.ts    | 11 ++++-------
 2 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 4df5722..e9752ef 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "perfume.js",
-  "version": "8.2.0",
+  "version": "8.3.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "perfume.js",
-      "version": "8.2.0",
+      "version": "8.3.0",
       "license": "MIT",
       "dependencies": {
         "web-vitals": "^3.1.0"
diff --git a/src/observe.ts b/src/observe.ts
index 4d19b47..de3c8f8 100644
--- a/src/observe.ts
+++ b/src/observe.ts
@@ -14,14 +14,11 @@ import { po } from './performanceObserver';
 import { initResourceTiming } from './resourceTiming';
 
 export const initPerformanceObserver = (): void => {
-  // @ts-ignore
   onTTFB(report => {
-    // Calculate the request time by subtracting from TTFB
-    // everything that happened prior to the request starting.
-    // @ts-ignore
-    report.value = report.value - report.entries[0].requestStart;
-    // @ts-ignore
-    logMetric(report);
+    if (report.value > 0) {
+      // @ts-ignore
+      logMetric(report);
+    }
   }, config.reportOptions.ttfb);
   // @ts-ignore
   onCLS(report => logMetric(report), config.reportOptions.cls);