refactor: replace boolean maybeNotEsm with parseGoal

src/ExportMap.js

@@ -44,12 +44,9 @@ export default class ExportMap {
     this.imports = new Map();
     this.errors = [];
     /**
-     * true when we are still unsure if
-     * the module is ESM, happens when the module
-     * contains dynamic `import()` but no other
-     * ESM import/export
+     * type {'ambiguous' | 'Module' | 'Script'}
      */
-    this.maybeNotEsm = false;
+    this.parseGoal = 'ambiguous';
   }
 
   get hasDefault() { return this.get('default') != null; } // stronger than this.has
@@ -413,8 +410,8 @@ ExportMap.parse = function (path, content, context) {
     },
   });
 
-  const maybeNotEsm = !unambiguous.isModule(ast);
-  if (maybeNotEsm && !hasDynamicImports) return null;
+  const unambiguouslyEsm = unambiguous.isModule(ast);
+  if (!unambiguouslyEsm && !hasDynamicImports) return null;
 
   const docstyle = (context.settings && context.settings['import/docstyle']) || ['jsdoc'];
   const docStyleParsers = {};
@@ -718,7 +715,9 @@ ExportMap.parse = function (path, content, context) {
     m.namespace.set('default', {}); // add default export
   }
 
-  m.maybeNotEsm = maybeNotEsm;
+  if (unambiguouslyEsm) {
+    m.parseGoal = 'Module';
+  }
   return m;
 };
 

src/rules/named.js

@@ -40,7 +40,7 @@ module.exports = {
       }
 
       const imports = Exports.get(node.source.value, context);
-      if (imports == null || imports.maybeNotEsm) {
+      if (imports == null || imports.parseGoal === 'ambiguous') {
         return;
       }
 
@@ -97,7 +97,7 @@ module.exports = {
         // return if it's not a string source
         || source.type !== 'Literal'
         || variableExports == null
-        || variableExports.maybeNotEsm
+        || variableExports.parseGoal === 'ambiguous'
       ) {
         return;
       }