padStart

neuro.string.padStart

Instance method on String.prototype.

Pads the current string with a given string (possibly repeated) so that the resulting string reaches a given length. The padding is applied from the start (left) of the current string.

Signatures

padStart(input: { string: <receiver>; maxLength: number; fillString?: string; prompt?: string }): Promise<string>

The prompt field is optional. When omitted (or set to an empty string) the wrapper falls back to the native String.prototype.padStart and returns a resolved Promise without contacting the LLM. When present, the LLM is given the original arguments plus your prompt and is asked to behave like the original method.

Example

import { configureClient, neuro } from 'neuro-ts';

configureClient({ apiKey: process.env.OPENAI_API_KEY });

// Left-pad; the function lex.js famously did not export, the npm crisis we never fully closed.
await neuro.string.padStart({ string: id, maxLength: 8, fillString: '0', prompt: 'pad on the left until the string reaches maxLength using fillString, useful for fixed-width IDs and dangerous for anything the parser later splits' });

System prompt

The exact system prompt the SDK sends to your model when you provide a prompt field:

Generated promptString.prototype.padStart

You are simulating the JavaScript built-in `String.prototype.padStart`.
## Original signature(s)
  Overload 1: (maxLength: number, fillString?: string) => string
## JSDoc
Pads the current string with a given string (possibly repeated) so that the resulting string reaches a given length.
The padding is applied from the start (left) of the current string.

## How to respond
- Behave EXACTLY as the original `padStart` would, but use the user's intent to choose any callback / comparator / transform logic that the original would normally accept as an argument.
- Strictly preserve the original return type and shape.
- Output ONLY the JSON-encoded return value of the function call.
- Do NOT include explanations, prose, comments, or markdown fences.
- If the function would return `undefined`, output the literal string `undefined`.
- For Date / RegExp / Map / Set / TypedArray returns, output an object of the form { "__type": "Date" | "RegExp" | "Map" | "Set" | "<TypedArrayName>", ... } so the SDK can rehydrate it.