naive module.parent implementation

Author: goto-bus-stop

index.js

@@ -114,6 +114,13 @@ function parseModule (row, index, rows) {
     })
   }
 
+  rows.forEach(function (p) {
+    var deps = Object.values(p.deps).map(String)
+    if (deps.includes(String(row.id)) && !row.parent) {
+      row.parent = p
+    }
+  })
+
   row.ast = ast
   row.isSimpleExport = isSimpleExport
   row.exportsName = moduleExportsName
@@ -163,6 +170,12 @@ function rewriteModule (row, i, rows) {
       // rewrite `typeof module` to `"object"`
       if (node.parent.type === 'UnaryExpression' && node.parent.operator === 'typeof') {
         node.parent.edit.update('"object"')
+      } else if (isModuleParent(node.parent)) {
+        if (row.entry) {
+          node.parent.edit.update('null')
+        } else {
+          node.parent.edit.update('({})')
+        }
       } else {
         renameIdentifier(node, moduleBaseName)
       }
@@ -398,6 +411,12 @@ function isModuleExports (node) {
     (node.property.type === 'Identifier' && node.property.name === 'exports' ||
       node.property.type === 'Literal' && node.property.value === 'exports')
 }
+function isModuleParent (node) {
+  return node.type === 'MemberExpression' &&
+    node.object.type === 'Identifier' && node.object.name === 'module' &&
+    (node.property.type === 'Identifier' && node.property.name === 'parent' ||
+      node.property.type === 'Literal' && node.property.value === 'parent')
+}
 function isRequire (node) {
   return node.type === 'CallExpression' &&
     node.callee.type === 'Identifier' && node.callee.name === 'require'

test/module-parent/app.js

@@ -0,0 +1,5 @@
+require('./child')
+
+if (module.parent) {
+  throw Error('should be entry point')
+}

test/module-parent/child.js

@@ -0,0 +1,5 @@
+if (module.parent) {
+  module.exports = 'required'
+} else {
+  module.exports = 'entry point'
+}