From 8b7957250f6903757ffbf6d6b2073f73919e7356 Mon Sep 17 00:00:00 2001
From: Keith Cirkel <keithamus@github.com>
Date: Mon, 31 Jul 2017 12:36:29 +0100
Subject: [PATCH] feat: add javascript_not_expression switch

---
 README.md         | 9 +++++++++
 doc/switch.txt    | 9 +++++++++
 plugin/switch.vim | 5 +++++
 3 files changed, 23 insertions(+)

diff --git a/README.md b/README.md
index 5cc71c3..15121da 100644
--- a/README.md
+++ b/README.md
@@ -454,6 +454,15 @@ Object* foo = bar->baz;
   ```
   Switching to var from const or let is unsupported, since it's assumed to be an unlikely case.
 
+* Comparison to false vs negation operator
+  ``` javascript
+  if (foo == false) { }
+  if (!foo) {}
+
+  if (foo.has(bar) === false) {}
+  if (!foo.has(bar)) {}
+  ```
+
 ### Coffeescript arrows
 
 ``` coffeescript
diff --git a/doc/switch.txt b/doc/switch.txt
index 806823a..fa28b46 100644
--- a/doc/switch.txt
+++ b/doc/switch.txt
@@ -526,6 +526,15 @@ ES6-style variable declaraions (g:switch_builtins.javascript_es6_declarations)
 <
 Switching to var from const or let is unsupported, since it's assumed to be an unlikely case.
 
+Comparison to false vs negation operator (g:switch_builtins.javascript_not_expression)
+>
+    if (foo == false) { }
+    if (!foo) {}
+
+    if (foo.has(bar) === false) {}
+    if (!foo.has(bar)) {}
+<
+
 Coffeescript ~
 
 Arrows (g:switch_builtins.coffee_arrow):
diff --git a/plugin/switch.vim b/plugin/switch.vim
index 64812ea..439926f 100644
--- a/plugin/switch.vim
+++ b/plugin/switch.vim
@@ -121,6 +121,10 @@ let g:switch_builtins =
       \     '\<let\s\+': 'const ',
       \     '\<const\s\+': 'let ',
       \   },
+      \   'javascript_not_expression': {
+      \      '\<\([a-zA-z.()]\+\) === false': '!\1',
+      \      '!\<\([a-zA-z.()]\+\)':          '\1 === false',
+      \   },
       \   'coffee_arrow': {
       \     '^\(.*\)->': '\1=>',
       \     '^\(.*\)=>': '\1->',
@@ -205,6 +209,7 @@ autocmd FileType javascript let b:switch_definitions =
       \   g:switch_builtins.javascript_function,
       \   g:switch_builtins.javascript_arrow_function,
       \   g:switch_builtins.javascript_es6_declarations,
+      \   g:switch_builtins.javascript_not_expression,
       \ ]
 
 autocmd FileType coffee let b:switch_definitions =