From fcaa34edf8f915f7ab7a5020212277cadda9cc22 Mon Sep 17 00:00:00 2001
From: XYShaoKang <38753204+XYShaoKang@users.noreply.github.com>
Date: Sat, 4 Sep 2021 10:56:38 +0800
Subject: [PATCH] chore(front-end): fix jest reporter
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

修复因 jest 使用 stderr 输出警告而导致的 CI 执行失败
https://github.com/microsoft/rushstack/issues/1329
---
 apps/front-end/jest.config.js      |  1 +
 apps/front-end/src/JestReporter.js | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 apps/front-end/src/JestReporter.js

diff --git a/apps/front-end/jest.config.js b/apps/front-end/jest.config.js
index f127687..3a8c1a6 100644
--- a/apps/front-end/jest.config.js
+++ b/apps/front-end/jest.config.js
@@ -2,6 +2,7 @@
 const config = {
   verbose: true,
   setupFilesAfterEnv: ['<rootDir>/src/setupTests.ts'],
+  reporters: ['./src/JestReporter.js'],
   testMatch: ['**/src/**/*.test.ts?(x)'],
   transform: {
     '^.+\\.[jt]sx?$': 'babel-jest',
diff --git a/apps/front-end/src/JestReporter.js b/apps/front-end/src/JestReporter.js
new file mode 100644
index 0000000..ede71b3
--- /dev/null
+++ b/apps/front-end/src/JestReporter.js
@@ -0,0 +1,28 @@
+// This doesn't have types for some reason
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const { DefaultReporter } = require('@jest/reporters')
+
+/**
+ * The purpose of this custom reporter is to prevent Jest from logging to stderr
+ * when there are no errors.
+ */
+class JestReporter extends DefaultReporter {
+  _isLoggingError = false
+
+  log(message) {
+    if (this._isLoggingError) {
+      process.stderr.write(message + '\n')
+    } else {
+      process.stdout.write(message + '\n')
+    }
+  }
+
+  printTestFileFailureMessage(...args) {
+    this._isLoggingError = true
+    super.printTestFileFailureMessage(...args)
+    this._isLoggingError = false
+  }
+}
+
+// jest needs this format
+module.exports = JestReporter