saadeghi/daisyui · error · Error

css must be a string

Error message

css must be a string

What it means

Mirror of the html type check: if css is defined but not a string (number, array, object, or null), the script throws. null for css is treated as a bad type, not as absent.

Source

Thrown at packages/tailwind-play-share/index.mjs:170

      let parsed
      try {
        parsed = JSON.parse(stdin)
      } catch (error) {
        throw new Error(`stdin must be JSON with html and css strings: ${error.message}`)
      }
      html = parsed.html
      css = parsed.css
    }
  }

  if (html === undefined && css === undefined) {
    throw new Error("Provide HTML/CSS using arguments, files, or JSON on stdin")
  }
  if (html !== undefined && typeof html !== "string") {
    throw new Error("html must be a string")
  }
  if (css !== undefined && typeof css !== "string") {
    throw new Error("css must be a string")
  }

  return { html: html ?? "", css: css ?? "" }
}

async function isExecutable(filePath) {
  try {
    await access(filePath, process.platform === "win32" ? fsConstants.F_OK : fsConstants.X_OK)
    return true
  } catch {
    return false
  }
}

async function resolveExecutable(candidate) {
  if (!candidate) return undefined

  if (isAbsolute(candidate) || candidate.includes("/") || candidate.includes("\\")) {

View on GitHub (pinned to 42b09e637e)

Solutions

1. Ensure the css field is a JSON string.
2. Omit the css key if you have no CSS.
3. Coerce css to a string before emitting JSON.

Example fix

# before
echo '{"html":"<div/>","css":null}' | bun .../index.mjs
# after
echo '{"html":"<div/>","css":""}' | bun .../index.mjs

if (css !== undefined && typeof css !== 'string') {
  throw new Error('css must be a string')
}

const isOptionalString = (v) => v === undefined || typeof v === 'string'

When it happens

Trigger: Piping JSON like `{"css":42}`, `{"css":{"import":true}}`, or `{"css":null}`.

Common situations: Producer serializes an object/number for css; null intended to mean 'no css'.

Related errors

• html must be a string
• stdin must be JSON with html and css strings: ${error.messag
• Provide HTML/CSS using arguments, files, or JSON on stdin
• --timeout must be a positive number of milliseconds
• --timeout must be a positive number of milliseconds

AI-assisted analysis of saadeghi/daisyui@42b09e637e (2026-08-13). Data as JSON: /api/errors/b1e8633f3935a306. Report an issue: GitHub.