language: unflattenLanguageSpec: no lonely '_' keys

This might be a crude implementation, but keeps language results
from including {_: 'some string...'} objects that don't have any
other keys, even when preventing so causes a mismatch with the
reference spec/layout. (Of course, the "mismatch" is only
presentationally and not semantically, and we already make other
presentational differences because we output JSON and not YAML
in this function.)

1 files changed, 6 insertions, 0 deletions

diff --git a/src/data/language.js b/src/data/language.js
index a149e19f..f91e123d 100644
--- a/src/data/language.js
+++ b/src/data/language.js
@@ -110,6 +110,12 @@ export function unflattenLanguageSpec(flat, reference) {
         return {[firstKey]: result};
       }
 
+      const resultKeys = Object.keys(result);
+      if (resultKeys.length === 1 && resultKeys[0] === '_') {
+        delete ownNode[firstKey];
+        return {[firstKey]: result._};
+      }
+
       if (refKeys.length > 1) {
         return withEntries(result, entries =>
           entries.map(([key, value]) => [`${firstKey}.${key}`, value]));