Function deepMergeInputMapping

apps/sim/tools/params.ts:728–768

(
  llmInputMapping: Record<string, unknown> | undefined,
  userInputMapping: Record<string, unknown> | string | undefined
)

 * User-provided non-empty values take precedence.
 */
export function deepMergeInputMapping(
  llmInputMapping: Record<string, unknown> | undefined,
  userInputMapping: Record<string, unknown> | string | undefined
): Record<string, unknown> {
  // Parse user inputMapping if it's a JSON string
  let parsedUserMapping: Record<string, unknown> = {}
  if (typeof userInputMapping === 'string') {
    try {
      const parsed = JSON.parse(userInputMapping)
      if (isRecordLike(parsed)) {
        parsedUserMapping = parsed
      }
    } catch {
      // Invalid JSON, treat as empty
    }
  } else if (
    typeof userInputMapping === 'object' &&
    userInputMapping !== null &&
    !Array.isArray(userInputMapping)
  ) {
    parsedUserMapping = userInputMapping
  }

  // If no LLM mapping, return user mapping (or empty)
  if (!llmInputMapping || typeof llmInputMapping !== 'object') {
    return parsedUserMapping
  }

  // Deep merge: LLM values as base, user non-empty values override
  // If user provides empty object {}, LLM values fill all fields (intentional)
  const merged: Record<string, unknown> = { ...llmInputMapping }

  for (const [key, userValue] of Object.entries(parsedUserMapping)) {
    // Only override LLM value if user provided a non-empty value
    if (isNonEmpty(userValue)) {
      merged[key] = userValue
    }
  }

  return merged
}

/**
 * Merges user-provided parameters with LLM-generated parameters.