logger: don't throw when color doesn't exist

Fixes #580

Author: gustavohenke

lib/logger.spec.ts

@@ -211,6 +211,16 @@ describe('#logCommandText()', () => {
         expect(logger.log).toHaveBeenCalledWith(`${chalk.blue('[1]')} `, 'foo', cmd);
     });
 
+    it('logs prefix using default color if prefixColor from command is not a valid color', () => {
+        const { logger } = createLogger({});
+        const cmd = new FakeCommand('', undefined, 1, {
+            prefixColor: 'fake.bold',
+        });
+        logger.logCommandText('foo', cmd);
+
+        expect(logger.log).toHaveBeenCalledWith(chalk.reset('[1]') + ' ', 'foo', cmd);
+    });
+
     it('logs prefix in gray dim if prefixColor from command does not exist', () => {
         const { logger } = createLogger({});
         const cmd = new FakeCommand('', undefined, 1, {

lib/logger.ts

@@ -12,7 +12,10 @@ const noColorChalk = new Chalk({ level: 0 });
 function getChalkPath(chalk: ChalkInstance, path: string): ChalkInstance | undefined {
     return path
         .split('.')
-        .reduce((prev, key) => (prev as unknown as Record<string, ChalkInstance>)[key], chalk);
+        .reduce(
+            (prev, key) => prev && (prev as unknown as Record<string, ChalkInstance>)[key],
+            chalk,
+        );
 }
 
 export class Logger {