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metabuilder/.github/prompts/implement/backend/3-impl-lua-script.prompt.md
2026-01-03 20:17:49 +00:00

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# Write Lua Business Logic
Add business logic as a sandboxed Lua script:
## Create Script
Location: `packages/{pkg}/seed/scripts/` or `src/lib/lua-snippets.ts`
```lua
-- Sandbox restrictions: NO os, io, require, loadfile
function validateInput(value)
if not value or value == "" then
return false, "Value required"
end
return true, nil
end
```
## Register Script
```typescript
renderer.registerLuaScript('validate_input', {
code: luaCode,
parameters: [{ name: 'value', type: 'string' }],
returnType: 'boolean'
})
```
## Execute Script
```typescript
const result = await renderer.executeLuaScript('validate_input', [userInput])
```
## When to Use Lua
- Validation rules
- Data transformation
- Conditional rendering logic
- Business rules that change frequently