fix: Add workaround when appName can't be read, fixes #418

docs/transports/file.md

@@ -125,4 +125,8 @@ Reads content of all log files.
 Be careful, if you use multiple log directories through overriding resolvePath,
 it won't return all the files.
 
+#### `setAppName(appName: string)`
+
+Overrides appName used for resolving the log path
+
 <!-- spech-dictionary whether -->

src/index.d.ts

@@ -261,6 +261,12 @@ declare namespace Logger {
      */
     resolvePathFn: (variables: PathVariables, message?: LogMessage) => string;
 
+    /**
+     * Override appName used for resolving log path
+     * @param appName
+     */
+    setAppName(appName: string): void;
+
     /**
      * Whether to write a log file synchronously. Default to true
      */

src/main/ElectronExternalApi.js

@@ -21,7 +21,9 @@ class ElectronExternalApi extends NodeExternalApi {
   getAppName() {
     let appName;
     try {
-      appName = this.electron.app?.name || this.electron.app?.getName();
+      appName = this.appName
+        || this.electron.app?.name
+        || this.electron.app?.getName();
     } catch {
       // fallback to default value below
     }

src/node/NodeExternalApi.js

@@ -21,7 +21,17 @@ class NodeExternalApi {
   }
 
   getAppName() {
-    return this.appName || this.getAppPackageJson()?.name;
+    const appName = this.appName || this.getAppPackageJson()?.name;
+    if (!appName) {
+      throw new Error(
+        'electron-log can\'t determine the app name. It tried these methods:\n'
+        + '1. Use `electron.app.name`\n'
+        + '2. Use productName or name from the nearest package.json`\n'
+        + 'You can also set it through log.transports.file.setAppName()',
+      );
+    }
+
+    return appName;
   }
 
   /**
@@ -181,6 +191,10 @@ class NodeExternalApi {
     });
   }
 
+  setAppName(appName) {
+    this.appName = appName;
+  }
+
   setPlatform(platform) {
     this.platform = platform;
   }

src/node/transports/file/index.js

@@ -54,6 +54,10 @@ function fileTransportFactory(
     resolvePathFn(vars) {
       return path.join(vars.libraryDefaultDir, vars.fileName);
     },
+
+    setAppName(name) {
+      logger.dependencies.externalApi.setAppName(name);
+    },
   });
 
   function transport(message) {