yarn-spinner-runner-ts/docs/shadow-lines.md

TypeScript parser, compiler, and runtime for Yarn Spinner 3.x with React adapter [NPM package](https://www.npmjs.com/package/yarn-spinner-runner-ts)

## Shadow Lines (Yarn Spinner)

Source: [docs.yarnspinner.dev — Shadow Lines](https://docs.yarnspinner.dev/write-yarn-scripts/advanced-scripting/shadow-lines)

### What it covers
- Author alternative versions of lines (e.g., localized/variant lines) without changing IDs.
- Useful for VO/loc updates while preserving references.

### Example (conceptual)
```yarn
title: Start
---

Narrator: Primary line content.
// Shadow line variants are managed by tooling to swap text without new IDs.
===
```