From 508233cd370c81beb738419ce78898b0ad4686f8 Mon Sep 17 00:00:00 2001
From: iamkun <5992643+manre57@users.noreply.github.com>
Date: Sat, 9 Jan 2021 15:49:09 +0800
Subject: [PATCH] fix: update devHelper to add dev warning setting locale
 before loading

---
 src/plugin/devHelper/index.js | 9 +++++++++
 test/plugin/devHelper.test.js | 6 ++++++
 2 files changed, 15 insertions(+)

diff --git a/src/plugin/devHelper/index.js b/src/plugin/devHelper/index.js
index 5bace11..b4fb3c6 100644
--- a/src/plugin/devHelper/index.js
+++ b/src/plugin/devHelper/index.js
@@ -16,6 +16,15 @@ export default (o, c, d) => {
       }
       return oldParse.bind(this)(cfg)
     }
+    const oldLocale = d.locale
+    d.locale = function (preset, object, isLocal) {
+      if (typeof object === 'undefined' && typeof preset === 'string') {
+        if (!d.Ls[preset]) {
+          console.warn(`Guessing you may want to use locale ${preset}, you have to load it before using it. https://day.js.org/docs/en/i18n/loading-into-nodejs`)
+        }
+      }
+      return oldLocale(preset, object, isLocal)
+    }
   }
 }
 
diff --git a/test/plugin/devHelper.test.js b/test/plugin/devHelper.test.js
index c0c6935..c69190a 100644
--- a/test/plugin/devHelper.test.js
+++ b/test/plugin/devHelper.test.js
@@ -32,3 +32,9 @@ it('Warning Enable customParseFormat plugin while passing the second format para
   dayjs('2020', 'YYYY')
   expect(consoleSpy).toHaveBeenCalledWith('To parse a date-time string like 2020 using the given format, you should enable customParseFormat plugin first. https://day.js.org/docs/en/parse/string-format')
 })
+
+it('Warning: Setting locale before loading locale', () => {
+  const consoleSpy = jest.spyOn(console, 'warn')
+  dayjs.locale('zh-cn')
+  expect(consoleSpy).toHaveBeenCalledWith('Guessing you may want to use locale zh-cn, you have to load it before using it. https://day.js.org/docs/en/i18n/loading-into-nodejs')
+})