feat(@formatjs/cli): add --output-empty-json option

Output file with empty [] if src has no messages. For build systems like bazel that relies on specific output mapping, not writing out a file can cause issues.

Author: Long Ho

packages/cli/README.md

@@ -42,5 +42,6 @@ Options:
                                                         `intl.formatMessage({ id: 'foo', defaultMessage: 'bar',
                                                         description: 'baz'})` (default: false)
   --ignore                                              List of glob paths to **not** extract translations from.
+  --output-empty-json                                   Output file with empty [] if src has no messages. For build systems like bazel that relies on specific output mapping, not writing out a file can cause issues.
   -h, --help                                            output usage information
 ```

packages/cli/src/cli.ts

@@ -98,6 +98,11 @@ async function main(argv: string[]) {
       ].join(''),
       false
     )
+    .option(
+      '--output-empty-json',
+      'Output file with empty [] if src has no messages. For build systems like bazel that relies on specific output mapping, not writing out a file can cause issues.',
+      false
+    )
     .option(
       '--ignore <files>',
       'List of glob paths to **not** extract translations from.'
@@ -122,6 +127,7 @@ async function main(argv: string[]) {
         removeDefaultMessage: cmdObj.removeDefaultMessage,
         additionalComponentNames: cmdObj.additionalComponentNames,
         extractFromFormatMessageCall: cmdObj.extractFromFormatMessageCall,
+        outputEmptyJson: cmdObj.outputEmptyJson,
       });
       process.exit(0);
     });