Function setupContexts

packages/react-debug-tools/src/ReactDebugHooks.js:1232–1250

(contextMap: Map<ReactContext<any>, any>, fiber: Fiber)

}

function setupContexts(contextMap: Map<ReactContext<any>, any>, fiber: Fiber) {
  let current: null | Fiber = fiber;
  while (current) {
    if (current.tag === ContextProvider) {
      let context: ReactContext<any> = current.type;
      if ((context: any)._context !== undefined) {
        // Support inspection of pre-19+ providers.
        context = (context: any)._context;
      }
      if (!contextMap.has(context)) {
        // Store the current value that we're going to restore later.
        contextMap.set(context, context._currentValue);
        // Set the inner most provider value on the context.
        context._currentValue = current.memoizedProps.value;
      }
    }
    current = current.return;
  }
}

function restoreContexts(contextMap: Map<ReactContext<any>, any>) {
  contextMap.forEach((value, context) => (context._currentValue = value));