smartquote

What are smart quotes?

Smart quotes are the curly or sloped quotation marks used in typography. Straight "dumb" quotes are a typewriter-era limitation and shouldn’t be used in user-facing text.

Why this exists

Some LLMs (all Anthropic models, for instance) are incapable of outputting smart quotes, even when explicitly asked—and Anthropic has confirmed this won’t be fixed anytime soon. This package provides a streaming transform for AI output and an ESLint rule/autofix for vibe-coded JSX/TSX.

Usage

import { streamText } from "ai";
import { anthropic } from "@ai-sdk/anthropic";
import { smartQuoteTransform } from "smartquote/ai-sdk";

const result = streamText({
  model: anthropic("claude-sonnet-4-5"),
  prompt: "How do I print Hello World in JS?",
  experimental_transform: smartQuoteTransform(),
});

import { smartQuoteTransform } from "smartquote";

const response = await fetch("/api/stream");
const transformed = response.body
  .pipeThrough(new TextDecoderStream())
  .pipeThrough(smartQuoteTransform());

import { smartQuoteAsyncIterable } from "smartquote";

for await (const chunk of smartQuoteAsyncIterable(stream)) {
  process.stdout.write(chunk);
}

// eslint.config.js
import { plugin } from 'smartquote/eslint';

export default [{
  plugins: { smartquote: plugin },
  rules: { 'smartquote/smart-quotes': 'error' }
}];