fix: Remove Storybook parameters if story is present

storybook-addon-export-to-codesandbox/src/plugins/fullsource.ts

@@ -1,5 +1,6 @@
 import * as Babel from '@babel/core';
 import modifyImportsPlugin from './modifyImports';
+import removeStorybookParameters from './removeStorybookParameters';
 
 export const PLUGIN_NAME = 'storybook-stories-fullsource';
 
@@ -44,7 +45,7 @@ export default function (babel: typeof Babel, options: BabelPluginOptions): Babe
           const transformedCode = babel.transformSync(path.node.init.value, {
             ...state.file.opts,
             comments: false,
-            plugins: [[modifyImportsPlugin, options]],
+            plugins: [[modifyImportsPlugin, options], removeStorybookParameters],
           }).code;
 
           path.get('init').replaceWith(t.stringLiteral(transformedCode));

storybook-addon-export-to-codesandbox/src/plugins/removeStorybookParameters.ts

@@ -0,0 +1,33 @@
+import * as Babel from '@babel/core';
+
+export const PLUGIN_NAME = 'babel-plugin-remove-storybook-parameters';
+
+/**
+ * This plugin finds Storybook "parameters" assignment and removes it, if it contains "story" key.
+ * The reason for this is that sometimes "story" is not a hardcoded string, but it is imported from
+ * a markdown file, which results in story being undefined and CodeSandbox example not working.
+ *
+ * Since we dont actually need Storybook parameters in the CodeSandbox anyway,
+ * the easiest thing to do is to remove it altogether.
+ */
+export default function removeStorybookParameters(babel: typeof Babel): Babel.PluginObj {
+  const { types: t } = babel;
+
+  return {
+    name: PLUGIN_NAME,
+    visitor: {
+      Identifier(path) {
+        if (path.node.name === 'story') {
+          const parentPath = path.findParent(
+            path =>
+              path.isAssignmentExpression() &&
+              t.isMemberExpression(path.node.left) &&
+              t.isIdentifier(path.node.left.property) &&
+              path.node.left.property.name === 'parameters',
+          );
+          parentPath?.remove();
+        }
+      },
+    },
+  };
+}