style(commit.ts): format code with prettier

refactor(commit.ts): add types to commit function parameters
fix(git.ts): handle empty string returned from getStagedFiles function

refactor(mergeStrings.ts): remove unnecessary blank line and add missing semicolon

src/commands/commit.ts

@@ -60,7 +60,12 @@ ${chalk.grey('——————————————————')}`
   });
 
   if (isCommitConfirmedByUser && !isCancel(isCommitConfirmedByUser)) {
-    const { stdout } = await execa('git', ['commit', '-m', commitMessage, ...extraArgs]);
+    const { stdout } = await execa('git', [
+      'commit',
+      '-m',
+      commitMessage,
+      ...extraArgs
+    ]);
 
     outro(`${chalk.green('✔')} successfully committed`);
 
@@ -83,8 +88,10 @@ ${chalk.grey('——————————————————')}`
   } else outro(`${chalk.gray('✖')} process cancelled`);
 };
 
-
-export async function commit(extraArgs=[], isStageAllFlag = false) {
+export async function commit(
+  extraArgs: string[] = [],
+  isStageAllFlag: Boolean = false
+) {
   if (isStageAllFlag) {
     const changedFiles = await getChangedFiles();
 
@@ -123,7 +130,6 @@ export async function commit(extraArgs=[], isStageAllFlag = false) {
       isStageAllAndCommitConfirmedByUser &&
       !isCancel(isStageAllAndCommitConfirmedByUser)
     ) {
-
       await commit(extraArgs, true);
       process.exit(1);
     }
@@ -153,7 +159,10 @@ export async function commit(extraArgs=[], isStageAllFlag = false) {
   );
 
   const [, generateCommitError] = await trytm(
-    generateCommitMessageFromGitDiff(await getDiff({ files: stagedFiles }), extraArgs)
+    generateCommitMessageFromGitDiff(
+      await getDiff({ files: stagedFiles }),
+      extraArgs
+    )
   );
 
   if (generateCommitError) {