| 1648 | } |
| 1649 | |
| 1650 | function createContext(defaultValue, calculateChangedBits) { |
| 1651 | if (calculateChangedBits === undefined) { |
| 1652 | calculateChangedBits = null; |
| 1653 | } else { |
| 1654 | { |
| 1655 | if (calculateChangedBits !== null && typeof calculateChangedBits !== 'function') { |
| 1656 | error('createContext: Expected the optional second argument to be a ' + 'function. Instead received: %s', calculateChangedBits); |
| 1657 | } |
| 1658 | } |
| 1659 | } |
| 1660 | |
| 1661 | var context = { |
| 1662 | $$typeof: REACT_CONTEXT_TYPE, |
| 1663 | _calculateChangedBits: calculateChangedBits, |
| 1664 | // As a workaround to support multiple concurrent renderers, we categorize |
| 1665 | // some renderers as primary and others as secondary. We only expect |
| 1666 | // there to be two concurrent renderers at most: React Native (primary) and |
| 1667 | // Fabric (secondary); React DOM (primary) and React ART (secondary). |
| 1668 | // Secondary renderers store their context values on separate fields. |
| 1669 | _currentValue: defaultValue, |
| 1670 | _currentValue2: defaultValue, |
| 1671 | // Used to track how many concurrent renderers this context currently |
| 1672 | // supports within in a single renderer. Such as parallel server rendering. |
| 1673 | _threadCount: 0, |
| 1674 | // These are circular |
| 1675 | Provider: null, |
| 1676 | Consumer: null |
| 1677 | }; |
| 1678 | context.Provider = { |
| 1679 | $$typeof: REACT_PROVIDER_TYPE, |
| 1680 | _context: context |
| 1681 | }; |
| 1682 | var hasWarnedAboutUsingNestedContextConsumers = false; |
| 1683 | var hasWarnedAboutUsingConsumerProvider = false; |
| 1684 | |
| 1685 | { |
| 1686 | // A separate object, but proxies back to the original context object for |
| 1687 | // backwards compatibility. It has a different $$typeof, so we can properly |
| 1688 | // warn for the incorrect usage of Context as a Consumer. |
| 1689 | var Consumer = { |
| 1690 | $$typeof: REACT_CONTEXT_TYPE, |
| 1691 | _context: context, |
| 1692 | _calculateChangedBits: context._calculateChangedBits |
| 1693 | }; // $FlowFixMe: Flow complains about not setting a value, which is intentional here |
| 1694 | |
| 1695 | Object.defineProperties(Consumer, { |
| 1696 | Provider: { |
| 1697 | get: function () { |
| 1698 | if (!hasWarnedAboutUsingConsumerProvider) { |
| 1699 | hasWarnedAboutUsingConsumerProvider = true; |
| 1700 | |
| 1701 | error('Rendering <Context.Consumer.Provider> is not supported and will be removed in ' + 'a future major release. Did you mean to render <Context.Provider> instead?'); |
| 1702 | } |
| 1703 | |
| 1704 | return context.Provider; |
| 1705 | }, |
| 1706 | set: function (_Provider) { |
| 1707 | context.Provider = _Provider; |