Support require.addon() with no specifier

lex.h

@@ -47,7 +47,7 @@ bare_module_lexer__add_position (js_env_t *env, js_value_t *entry, size_t statem
 
 static inline int
 bare_module_lexer__add_import (js_env_t *env, js_value_t *imports, uint32_t *i, const utf8_t *source, size_t import_start, size_t specifier_start, size_t specifier_end, int type, js_value_t *names) {
-  assert(specifier_end > specifier_start);
+  assert(specifier_end >= specifier_start);
 
   int err;
 
@@ -89,7 +89,7 @@ bare_module_lexer__add_import (js_env_t *env, js_value_t *imports, uint32_t *i,
 
 static inline int
 bare_module_lexer__add_export (js_env_t *env, js_value_t *exports, uint32_t *i, const utf8_t *source, size_t export_start, size_t name_start, size_t name_end) {
-  assert(name_end > name_start);
+  assert(name_end >= name_start);
 
   int err;
 
@@ -483,6 +483,14 @@ bare_module_lexer__lex (js_env_t *env, js_value_t *imports, js_value_t *exports,
           }
         }
       }
+
+      // require\.addon\(\)
+      else if (c(0) == ')' && (type & bare_module_lexer_addon)) {
+        ss = se = i++;
+
+        err = bare_module_lexer__add_import(env, imports, &il, s, is, ss, se, type, names);
+        if (err < 0) goto err;
+      }
     }
 
     continue;

test.js

@@ -17,6 +17,13 @@ test('require("id")', (t) => {
   })
 })
 
+test('require.addon()', (t) => {
+  t.alike(lex('require.addon()'), {
+    imports: [{ specifier: '', type: REQUIRE | ADDON, names: [], position: [0, 14, 14] }],
+    exports: []
+  })
+})
+
 test('require.addon(\'id\')', (t) => {
   t.alike(lex('require.addon(\'./foo.bare\')'), {
     imports: [{ specifier: './foo.bare', type: REQUIRE | ADDON, names: [], position: [0, 15, 25] }],