refactor: update _splitPrefixDesc

Author: MichaelCurrin

src/prepareCommitMsg.ts

@@ -41,9 +41,17 @@ export function _cleanJoin(first: string, second: string) {
  * Require a colon to exist to detect type prefix. i.e. 'ci' will be considered a description, but
  * 'ci:' will be considered a prefix. This keeps the check simpler as we don't have to match against
  * every type and we don't have to check if we are part of a word e.g. 'circus'.
+ *
+ * Now also supports Jira number e.g. '[ABCD-123] my description'.
  */
 function _splitPrefixDesc(value: string) {
-  const [prefix, description] = value.includes(":") ? value.split(":") : ["", value];
+  let prefix: string, description: string
+
+  if (value.includes(":")) {
+    [prefix, description] = value.split(":")
+  } else {
+    [prefix, description] = ["", value]
+  }
 
   return { prefix, description }
 }