From e2e246afd38dad4ee78d45143fe58e7d878c313c Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Tue, 14 May 2019 23:48:50 -0500
Subject: [PATCH] version detection: `detect`: only warn once

Closes #2276.
---
 lib/util/version.js   | 10 ++++++++--
 tests/util/version.js |  1 +
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/util/version.js b/lib/util/version.js
index f311d7b84b..f28288afd9 100644
--- a/lib/util/version.js
+++ b/lib/util/version.js
@@ -9,15 +9,20 @@ const error = require('./error');
 
 let warnedForMissingVersion = false;
 
+function resetWarningFlag() {
+  warnedForMissingVersion = false;
+}
+
 function detectReactVersion() {
   try {
     const reactPath = resolve.sync('react', {basedir: process.cwd()});
     const react = require(reactPath);
     return react.version;
   } catch (e) {
-    if (e.code === 'MODULE_NOT_FOUND') {
+    if (!warnedForMissingVersion && e.code === 'MODULE_NOT_FOUND') {
       error('Warning: React version was set to "detect" in eslint-plugin-react settings, ' +
         'but the "react" package is not installed. Assuming latest React version for linting.');
+      warnedForMissingVersion = true;
       return '999.999.999';
     }
     throw e;
@@ -107,5 +112,6 @@ function testFlowVersion(context, methodVer) {
 
 module.exports = {
   testReactVersion,
-  testFlowVersion
+  testFlowVersion,
+  resetWarningFlag
 };
diff --git a/tests/util/version.js b/tests/util/version.js
index cf0eaf034c..5eacb4633f 100644
--- a/tests/util/version.js
+++ b/tests/util/version.js
@@ -15,6 +15,7 @@ describe('Version', () => {
     process.chdir(base);
     sinon.stub(console, 'error');
     expectedErrorArgs = [];
+    versionUtil.resetWarningFlag();
   });
 
   afterEach(() => {