**Describe the bug** In a Svelte project, Storybook fails to generate a component documentation when it contains nested inline arrow functions (i.e. `() => () => {}`). **To Reproduce** Steps to reproduce the behavior: 1. Create a simple Svelte project with Storybook. You can bootstrap one using `npx degit chromaui/intro-storybook-svelte-template taskbox` for example; 2. Install dependencies; 3. Run storybook (`npm run storybook` or `yarn storybook`); 4. In any Svelte file, add an arrow function like in the "Code snippets" section below in one of the components; 5. You should see an error in the console (see "Additional context"). Additionally, the component documentation will be empty. **Expected behavior** There should be no error **Code snippets** ```svelte ``` **System** ``` Binaries: Node: 14.8.0 Yarn: 1.22.10 npm: 6.14.7 npmPackages: @storybook/addon-docs: ^6.1.21 => 6.1.21 @storybook/addon-essentials: ^6.1.21 => 6.1.21 @storybook/addon-links: ^6.1.21 => 6.1.21 @storybook/svelte: ^6.1.21 => 6.1.21 ``` **Additional context** The following error is displayed by Webpack during the build: ``` TypeError: nodes.forEach is not a function at Parser.parseBodyRecursively (/node_modules/sveltedoc-parser/lib/v3/parser.js:251:15) at /node_modules/sveltedoc-parser/lib/v3/parser.js:331:38 at Array.forEach () at /node_modules/sveltedoc-parser/lib/v3/parser.js:311:27 at Array.forEach () at Parser.parseBodyRecursively (/node_modules/sveltedoc-parser/lib/v3/parser.js:251:15) at Parser.parseScriptBlock (/node_modules/sveltedoc-parser/lib/v3/parser.js:571:14) at /node_modules/sveltedoc-parser/lib/v3/parser.js:72:22 at Array.forEach () at Parser.__walk (/node_modules/sveltedoc-parser/lib/v3/parser.js:71:36) at /node_modules/sveltedoc-parser/lib/v3/parser.js:56:22 ``` This error occurs in [`sveltedoc-parser`](https://github.com/alexprey/sveltedoc-parser) in versions `<4.1.0`. Storybook uses version `3.0.5`, and forcing the dependency to `^4.1.0` seem to solve the issue.

Svelte component documentation not generated when using inline arrow functions (`() => () => {}`) #14162

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