Function isJsonValue

packages/effect/src/JSONSchema.ts:440–470

(value: unknown, visited: Set<unknown> = new Set())

}

function isJsonValue(value: unknown, visited: Set<unknown> = new Set()): value is JsonValue {
  if (value === null || typeof value === "string" || typeof value === "number" || typeof value === "boolean") {
    return true
  }
  if (Array.isArray(value) || typeof value === "object") {
    // Check for cyclic references
    if (visited.has(value)) {
      return false
    }
    visited.add(value)
    try {
      if (Array.isArray(value)) {
        return value.every((item) => isJsonValue(item, visited))
      }
      // Exclude non-plain objects (Date, RegExp, etc.) by checking constructor
      const proto = Object.getPrototypeOf(value)
      if (proto !== null && proto !== Object.prototype) {
        return false
      }
      // JSON only allows string keys, so exclude objects with Symbol keys
      if (Object.getOwnPropertySymbols(value).length > 0) {
        return false
      }
      // Check all values are JSON values
      return Object.values(value).every((v) => isJsonValue(v, visited))
    } finally {
      visited.delete(value)
    }
  }
  return false
}

function pruneJsonSchemaAnnotations(
  ast: AST.AST,