Function constructClassInstance

packages/react-server/src/ReactFizzClassComponent.js:170–311

(
  ctor: any,
  props: any,
  maskedLegacyContext: any,
)

}

export function constructClassInstance(
  ctor: any,
  props: any,
  maskedLegacyContext: any,
): any {
  let context = emptyContextObject;
  const contextType = ctor.contextType;

  if (__DEV__) {
    if ('contextType' in ctor) {
      const isValid =
        // Allow null for conditional declaration
        contextType === null ||
        (contextType !== undefined &&
          contextType.$$typeof === REACT_CONTEXT_TYPE);

      if (!isValid && !didWarnAboutInvalidateContextType.has(ctor)) {
        didWarnAboutInvalidateContextType.add(ctor);

        let addendum = '';
        if (contextType === undefined) {
          addendum =
            ' However, it is set to undefined. ' +
            'This can be caused by a typo or by mixing up named and default imports. ' +
            'This can also happen due to a circular dependency, so ' +
            'try moving the createContext() call to a separate file.';
        } else if (typeof contextType !== 'object') {
          addendum = ' However, it is set to a ' + typeof contextType + '.';
        } else if (contextType.$$typeof === REACT_CONSUMER_TYPE) {
          addendum = ' Did you accidentally pass the Context.Consumer instead?';
        } else {
          addendum =
            ' However, it is set to an object with keys {' +
            Object.keys(contextType).join(', ') +
            '}.';
        }
        console.error(
          '%s defines an invalid contextType. ' +
            'contextType should point to the Context object returned by React.createContext().%s',
          getComponentNameFromType(ctor) || 'Component',
          addendum,
        );
      }
    }
  }

  if (typeof contextType === 'object' && contextType !== null) {
    context = readContext((contextType: any));
  } else if (!disableLegacyContext) {
    context = maskedLegacyContext;
  }

  const instance = new ctor(props, context);

  if (__DEV__) {
    if (
      typeof ctor.getDerivedStateFromProps === 'function' &&
      (instance.state === null || instance.state === undefined)