Function isContextProvider

packages/react-reconciler/src/ReactFiberLegacyContext.js:120–127

(type: Function)

}

function isContextProvider(type: Function): boolean {
  if (disableLegacyContext) {
    return false;
  } else {
    const childContextTypes = type.childContextTypes;
    return childContextTypes !== null && childContextTypes !== undefined;
  }
}

function popContext(fiber: Fiber): void {
  if (disableLegacyContext) {