different-ai/openwork · error · InterpreterRuntimeError

String.${name} is not available in CodeMode.

Error message

String.${name} is not available in CodeMode.

What it means

CodeMode only whitelists the String statics fromCharCode and fromCodePoint. Any other String.* static (e.g. String.raw, String.fromCharCode-adjacent helpers) is rejected by the sandbox to keep the exposed API surface minimal.

Source

Thrown at packages/codemode/src/stdlib/string.ts:49

  "search",
  "localeCompare",
  "normalize",
])

export const stringStatics = new Set(["fromCharCode", "fromCodePoint"])

export const invokeStringStatic = (name: string, args: Array<unknown>, node: AstNode): unknown => {
  const codes = args.map((arg) => {
    if (typeof arg !== "number") throw new InterpreterRuntimeError(`String.${name} expects number arguments.`, node)
    return arg
  })
  switch (name) {
    case "fromCharCode":
      return String.fromCharCode(...codes)
    case "fromCodePoint":
      return String.fromCodePoint(...codes)
    default:
      throw new InterpreterRuntimeError(`String.${name} is not available in CodeMode.`, node)
  }
}
import { type AstNode, InterpreterRuntimeError } from "../interpreter/model.js"

View on GitHub (pinned to 2b7df46e8a)

Solutions

  1. Use only fromCharCode or fromCodePoint.
  2. Replace String.raw with an explicitly escaped string literal.
  3. Build the needed helper in plain CodeMode code (e.g. a template literal instead of String.raw).

Example fix

// before
const p = String.raw`\n\t`
// after
const p = "\\n\\t"
Defensive patterns

Strategy: validation

Validate before calling

const stringStatics = new Set(["fromCharCode", "fromCodePoint"])
if (!stringStatics.has(name)) throw new TypeError(`String.${name} unsupported in CodeMode`)

Type guard

const isAllowedStringStatic = (name) => ["fromCharCode", "fromCodePoint"].includes(name)

Try / catch

try { v = String.raw`\n` } catch { v = "\\n" }

Prevention

When it happens

Trigger: Calling `String.raw`...`` or any static other than fromCharCode/fromCodePoint on the sandbox String object.

Common situations: Copying normal JS snippets into CodeMode that rely on String.raw or other statics; assuming the sandbox mirrors full ECMAScript.

Related errors

AI-assisted analysis of different-ai/openwork@2b7df46e8a (2026-09-01). Data as JSON: /api/errors/b51c83f2690ea8d8. Report an issue: GitHub.