refactor: Add back parentheses to function snippets.

close #4

Author: t7yang

README.md

@@ -75,14 +75,18 @@ No parentheses can make function snippet more flexible for generator function, g
 |  `tcf` | try/catch/finally          | `try {$1} catch $2 {$3} finally {$0}`                                                                                               |
 
 ### Functions
-| Prefix | Desc                                           | Body                     |
-| -----: | ---------------------------------------------- | ------------------------ |
-|    `f` | function                                       | `function $1 {$0}`       |
-|   `fa` | async function                                 | `async function $1 {$0}` |
-|   `af` | arrow function (ES2015)                        | `$1 => $0`               |
-|  `afa` | async arrow function (ES2015)                  | `async $1 => $0`         |
-| `iife` | immediately-invoked function expression (IIFE) | `($2)($1)$0`             |
-|   `pd` | parameter destructuring with type (TypeScript) | `${0:param} : ${1:type}` |
+| Prefix | Desc                                           | Body                           |
+| -----: | ---------------------------------------------- | ------------------------------ |
+|    `f` | function                                       | `function $1($2) {$0}`         |
+|    `f` | function (TypeScript)                          | `function $1($2)$3 {$0}`       |
+|   `fa` | async function                                 | `async function $1($2) {$0}`   |
+|   `fa` | async function (TypeScript)                    | `async function $1($2)$3 {$0}` |
+|   `af` | arrow function (ES2015)                        | `($1) => $0`                   |
+|   `af` | arrow function (ES2015 - TypeScript)           | `$1($2)$3 => $0`               |
+|  `afa` | async arrow function (ES2015)                  | `async ($1) => $0`             |
+|  `afa` | async arrow function (ES2015 - TypeScript)     | `async $1($2)$3 => $0`         |
+| `iife` | immediately-invoked function expression (IIFE) | `($2)($1)$0`                   |
+|   `pd` | parameter destructuring with type (TypeScript) | `${0:param} : ${1:type}`       |
 
 ### Iterables
 | Prefix | Desc             | Body                               |

snippets/javascript.json

@@ -109,22 +109,22 @@
 
   "function": {
     "prefix": "f",
-    "body": "function $1 {$0}",
+    "body": "function $1($2) {$0}",
     "description": "function"
   },
   "async function": {
     "prefix": "fa",
-    "body": "async function $1 {$0}",
+    "body": "async function $1($2) {$0}",
     "description": "async function"
   },
   "arrow function (ES2015)": {
     "prefix": "af",
-    "body": "$1 => $0",
+    "body": "($1) => $0",
     "description": "arrow function (ES2015)"
   },
   "async arrow function (ES2015)": {
     "prefix": "afa",
-    "body": "async $1 => $0",
+    "body": "async ($1) => $0",
     "description": "async arrow function (ES2015)"
   },
   "immediately-invoked function expression (IIFE)": {

snippets/typescript.json

@@ -109,22 +109,22 @@
 
   "function": {
     "prefix": "f",
-    "body": "function $1 {$0}",
+    "body": "function $1($2)$3 {$0}",
     "description": "function"
   },
   "async function": {
     "prefix": "fa",
-    "body": "async function $1 {$0}",
+    "body": "async function $1($2)$3 {$0}",
     "description": "async function"
   },
   "arrow function (ES2015)": {
     "prefix": "af",
-    "body": "$1 => $0",
+    "body": "$1($2)$3 => $0",
     "description": "arrow function (ES2015)"
   },
   "async arrow function (ES2015)": {
     "prefix": "afa",
-    "body": "async $1 => $0",
+    "body": "async $1($2)$3 => $0",
     "description": "async arrow function (ES2015)"
   },
   "immediately-invoked function expression (IIFE)": {