Add support for indirect default export declarations

src/config-parser.js

@@ -56,14 +56,32 @@ class ConfigParser {
   // Return the configuration object or null.
   findConfigurationObject(ast) {
     // Try to find a default export
-    var defaultExport = ast.body.find(
-      node => node.type === 'ExportDefaultDeclaration' && node.declaration.type === 'ObjectExpression'
-    )
-    if (defaultExport) {
-      core.info('Found configuration object in default export declaration')
+    var defaultExport = ast.body.find(node => node.type === 'ExportDefaultDeclaration')
+
+    // Direct default export
+    if (defaultExport && defaultExport.declaration.type === 'ObjectExpression') {
+      core.info('Found configuration object in direct default export declaration')
       return defaultExport.declaration
     }
 
+    // Indirect default export
+    else if (defaultExport && defaultExport.declaration.type === 'Identifier') {
+      const identifierName = defaultExport && defaultExport.declaration.name
+      const identifierDefinition = ast.body.find(
+        node =>
+          node.type === 'VariableDeclaration' &&
+          node.declarations.length == 1 &&
+          node.declarations[0].type === 'VariableDeclarator' &&
+          node.declarations[0].id.type === 'Identifier' &&
+          node.declarations[0].id.name === identifierName &&
+          node.declarations[0].init.type === 'ObjectExpression'
+      )
+      if (identifierDefinition) {
+        core.info('Found configuration object in indirect default export declaration')
+        return identifierDefinition.declarations[0].init
+      }
+    }
+
     // Try to find a module export
     var moduleExport = ast.body.find(
       node =>

src/config-parser.test.js

@@ -12,7 +12,6 @@ const cases = [
   //
   // Default export
   //
-
   {
     property: 'property',
     source: `export default {}`,
@@ -90,6 +89,30 @@ const cases = [
     expected: `export default { a2: false, a1: { a2: "value", a3: [12]}}`
   },
 
+  //
+  // Indirect default export
+  //
+  {
+    property: 'property',
+    source: `const config = {}; export default config`,
+    expected: `const config = { property: "value"}; export default config`
+  },
+  {
+    property: 'property',
+    source: `var config = {}; export default config`,
+    expected: `var config = { property: "value"}; export default config`
+  },
+  {
+    property: 'a.b.c',
+    source: `var config = {}; export default config`,
+    expected: `var config = { a: { b: { c: "value"}}}; export default config`
+  },
+  {
+    property: 'a.b.c',
+    source: `var config = { a: { b: [], c: "hello"}}; export default config`,
+    expected: `var config = { a: { b: { c: "value"}, c: "hello"}}; export default config`
+  },
+
   //
   // Direct module exports
   //