@react-navigation/core/lib/module/checkSerializable.js

Core utilities for building navigators

"use strict";

const checkSerializableWithoutCircularReference = (o, seen, location) => {
  if (o === undefined || o === null || typeof o === 'boolean' || typeof o === 'number' || typeof o === 'string') {
    return {
      serializable: true
    };
  }
  if (Object.prototype.toString.call(o) !== '[object Object]' && !Array.isArray(o)) {
    return {
      serializable: false,
      location,
      reason: typeof o === 'function' ? 'Function' : String(o)
    };
  }
  if (seen.has(o)) {
    return {
      serializable: false,
      reason: 'Circular reference',
      location
    };
  }
  seen.add(o);
  if (Array.isArray(o)) {
    for (let i = 0; i < o.length; i++) {
      const childResult = checkSerializableWithoutCircularReference(o[i], new Set(seen), [...location, i]);
      if (!childResult.serializable) {
        return childResult;
      }
    }
  } else {
    for (const key in o) {
      const childResult = checkSerializableWithoutCircularReference(o[key], new Set(seen), [...location, key]);
      if (!childResult.serializable) {
        return childResult;
      }
    }
  }
  return {
    serializable: true
  };
};
export function checkSerializable(o) {
  return checkSerializableWithoutCircularReference(o, new Set(), []);
}
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