yarn-spinner-runner-ts/docs/once.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)

## Once (Yarn Spinner)

Source: [docs.yarnspinner.dev — Once](https://docs.yarnspinner.dev/write-yarn-scripts/scripting-fundamentalsendonce)

### What it covers
- Ensure a section runs only the first time it’s reached.
- Useful for tutorials, first-time greetings, unique rewards.

### Example
```yarn
title: Start
---

<<once>>
    Guide: Welcome! This shows only once.
<<endonce>>

Guide: This shows every time.
===
```