fix(ivy): ngcc - show logging via CLI by default (#29686)

The new logger implementation caused a regression where
by default the ngcc CLI did not output any logging messages.

PR Close #29686

integration/ngcc/test.sh

@@ -7,7 +7,9 @@ PATH=$PATH:$(npm bin)
 ivy-ngcc --help
 
 # node --inspect-brk $(npm bin)/ivy-ngcc -f esm2015
-ivy-ngcc
+# Run ngcc and check it logged compilation output as expected
+ivy-ngcc | grep 'Compiling'
+if [[ $? != 0 ]]; then exit 1; fi
 
 # Did it add the appropriate build markers?
 
@@ -60,7 +62,12 @@ ivy-ngcc
   if [[ $? != 0 ]]; then exit 1; fi
 
 # Can it be safely run again (as a noop)?
-ivy-ngcc
+# And check that it logged skipping compilation as expected
+ivy-ngcc | grep 'Skipping'
+if [[ $? != 0 ]]; then exit 1; fi
+
+# Check that running it with logging level error outputs nothing
+ivy-ngcc -l error | grep '.' && exit 1
 
 # Does running it with --formats fail?
 ivy-ngcc --formats fesm2015 && exit 1

packages/compiler-cli/ngcc/main-ngcc.ts

@@ -60,14 +60,14 @@ if (require.main === module) {
   const propertiesToConsider: string[] = options['p'];
   const targetEntryPointPath = options['t'] ? options['t'] : undefined;
   const compileAllFormats = !options['first-only'];
-  const logLevel = options['l'] as keyof typeof LogLevel;
+  const logLevel = options['l'] as keyof typeof LogLevel | undefined;
   try {
     mainNgcc({
       basePath: baseSourcePath,
       propertiesToConsider,
       targetEntryPointPath,
       compileAllFormats,
-      logger: new ConsoleLogger(LogLevel[logLevel]),
+      logger: logLevel && new ConsoleLogger(LogLevel[logLevel]),
     });
     process.exitCode = 0;
   } catch (e) {