Typescript: Migrate @storybook/csf-tools to strict TS

code/lib/csf-tools/src/ConfigFile.ts

@@ -447,7 +447,7 @@ export class ConfigFile {
 
   appendValueToArray(path: string[], value: any) {
     const node = this.valueToNode(value);
-    this.appendNodeToArray(path, node);
+    if (node) this.appendNodeToArray(path, node);
   }
 
   appendNodeToArray(path: string[], node: t.Expression) {

code/lib/csf-tools/src/babelParse.ts

@@ -13,7 +13,7 @@ function parseWithFlowOrTypescript(source: string, parserOptions: babelParser.Pa
   // Merge the provided parserOptions with the custom parser plugins
   const mergedParserOptions = {
     ...parserOptions,
-    plugins: [...parserOptions.plugins, ...parserPlugins],
+    plugins: [...(parserOptions.plugins ?? []), ...parserPlugins],
   };
 
   return babelParser.parse(source, mergedParserOptions);

code/lib/csf-tools/src/getStorySortParameter.ts

@@ -105,7 +105,7 @@ export const getStorySortParameter = (previewCode: string) => {
           node.declaration.declarations.forEach((decl) => {
             if (t.isVariableDeclarator(decl) && t.isIdentifier(decl.id)) {
               const { name: exportName } = decl.id;
-              if (exportName === 'parameters') {
+              if (exportName === 'parameters' && decl.init) {
                 const paramsObject = stripTSModifiers(decl.init);
                 storySort = parseParameters(paramsObject);
               }

code/lib/csf-tools/tsconfig.json

@@ -1,7 +1,7 @@
 {
   "extends": "../../tsconfig.json",
   "compilerOptions": {
-    "strict": false
+    "strict": true
   },
   "include": ["src/**/*"]
 }