feat: fossil.username is a string now

README.md

@@ -102,14 +102,14 @@ about cloning from the extension.
   `"true"` — enabled
   `"false"` — disabled, manual refresh still available.
 
-`fossil.path { string / null }`
+`fossil.path { string }`
 
   * Specifies an explicit `fossil` file path to use.
   * This should only be used if `fossil` cannot be found automatically.
-  * The default behaviour is to search for `fossil` in commonly-known
-    install locations and on the PATH.
+  * The default behaviour is to search for `fossil` on the PATH.
+  * Takes effect immediately.
 
-`fossil.username { string / null }`
+`fossil.username { string }`
 
   * Specifies an explicit user to use for fossil commits.
   * This should only be used if the user is different than the fossil default user.

package.json

@@ -1061,12 +1061,8 @@
                     "description": "%config.path%"
                 },
                 "fossil.username": {
-                    "type": [
-                        "string",
-                        "null"
-                    ],
-                    "description": "%config.username%",
-                    "default": null
+                    "type": "string",
+                    "description": "%config.username%"
                 },
                 "fossil.confirmGitExport": {
                     "type": "string",

src/config.ts

@@ -6,7 +6,7 @@ interface ConfigScheme {
     ignoreMissingFossilWarning: boolean;
     path: UnvalidatedFossilExecutablePath;
     autoInOutInterval: number;
-    username: FossilUsername | null;
+    username: FossilUsername; // must be ignored when empty
     autoRefresh: boolean;
     enableRenaming: boolean;
     confirmGitExport: 'Automatically' | 'Never' | null;
@@ -58,7 +58,7 @@ class Config {
      * * This should only be used if the user is different
      *   than the fossil default user.
      */
-    get username(): FossilUsername | null {
+    get username(): FossilUsername {
         return this.get('username');
     }
 

src/openedRepository.ts

@@ -259,14 +259,14 @@ export class OpenedRepository {
     async commit(
         message: FossilCommitMessage,
         fileList: RelativePath[],
-        user: FossilUsername | null,
+        user: FossilUsername,
         newBranch: NewBranchOptions | undefined
     ): Promise<ExecResult> {
         // always pass a message, otherwise fossil
         // internal editor will spawn
         return this.exec([
             'commit',
-            ...(user ? ['--user-override', user] : []),
+            ...(user.length ? ['--user-override', user] : []),
             ...(newBranch
                 ? [
                       ...(newBranch.branch