From 2e1b3f94ad3620c87d8f5587576628a56556054e Mon Sep 17 00:00:00 2001
From: Timo Tijhof <krinklemail@gmail.com>
Date: Tue, 26 Jun 2018 18:22:26 +0100
Subject: [PATCH] mediawiki.inspect: Fix exception when calling mw.inspect() a
 second time

In mediawiki.js, the mw.inspect() method is defined to lazy-load the
'mediawiki.inspect' module, and then call mw.inspect.runReports().

The problem is that, mediawiki.inspect.js, re-creates mw.inspect as a plain
object, which blows away the mw.inspect() function that was there.

Calling it a second time threw "TypeError: inspect is not a function".

Fix this by making mediawiki.inspect.js extend the function object,
instead of re-defining it.

Bug: T197810
Change-Id: I61aa965f3e1fd0a1c9f9d98310632b4a8d5e1683
---
 resources/src/mediawiki.inspect.js | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/resources/src/mediawiki.inspect.js b/resources/src/mediawiki.inspect.js
index cf94083676..e2030c9e55 100644
--- a/resources/src/mediawiki.inspect.js
+++ b/resources/src/mediawiki.inspect.js
@@ -1,5 +1,5 @@
 /*!
- * Tools for inspecting page composition and performance.
+ * The mediawiki.inspect module.
  *
  * @author Ori Livneh
  * @since 1.22
@@ -9,7 +9,19 @@
 
 ( function ( mw, $ ) {
 
-	var inspect,
+	// mw.inspect is a singleton class with static methods
+	// that itself can also be invoked as a function (mediawiki.base/mw#inspect).
+	// In JavaScript, that is implemented by starting with a function,
+	// and subsequently setting additional properties on the function object.
+
+	/**
+	 * Tools for inspecting page composition and performance.
+	 *
+	 * @class mw.inspect
+	 * @singleton
+	 */
+
+	var inspect = mw.inspect,
 		byteLength = require( 'mediawiki.String' ).byteLength,
 		hasOwn = Object.prototype.hasOwnProperty;
 
@@ -32,12 +44,6 @@
 		return bytes.toFixed( i > 0 ? 1 : 0 ) + units[ i ];
 	}
 
-	/**
-	 * @class mw.inspect
-	 * @singleton
-	 */
-	inspect = {};
-
 	/**
 	 * Return a map of all dependency relationships between loaded modules.
 	 *
@@ -332,6 +338,4 @@
 		mw.log( 'mw.inspect: reports are not available in debug mode.' );
 	}
 
-	mw.inspect = inspect;
-
 }( mediaWiki, jQuery ) );
-- 
2.20.1