Function constructClassInstance

dash/deps/react-dom@18.2.0.js:14291–14408

(workInProgress, ctor, props)

  }

  function constructClassInstance(workInProgress, ctor, props) {
    var isLegacyContextConsumer = false;
    var unmaskedContext = emptyContextObject;
    var context = emptyContextObject;
    var contextType = ctor.contextType;

    {
      if ('contextType' in ctor) {
        var isValid = // Allow null for conditional declaration
        contextType === null || contextType !== undefined && contextType.$$typeof === REACT_CONTEXT_TYPE && contextType._context === undefined; // Not a <Context.Consumer>

        if (!isValid && !didWarnAboutInvalidateContextType.has(ctor)) {
          didWarnAboutInvalidateContextType.add(ctor);
          var 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_PROVIDER_TYPE) {
            addendum = ' Did you accidentally pass the Context.Provider instead?';
          } else if (contextType._context !== undefined) {
            // <Context.Consumer>
            addendum = ' Did you accidentally pass the Context.Consumer instead?';
          } else {
            addendum = ' However, it is set to an object with keys {' + Object.keys(contextType).join(', ') + '}.';
          }

          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);
    } else {
      unmaskedContext = getUnmaskedContext(workInProgress, ctor, true);
      var contextTypes = ctor.contextTypes;
      isLegacyContextConsumer = contextTypes !== null && contextTypes !== undefined;
      context = isLegacyContextConsumer ? getMaskedContext(workInProgress, unmaskedContext) : emptyContextObject;
    }

    var instance = new ctor(props, context); // Instantiate twice to help detect side-effects.

    {
      if ( workInProgress.mode & StrictLegacyMode) {
        setIsStrictModeForDevtools(true);

        try {
          instance = new ctor(props, context); // eslint-disable-line no-new
        } finally {
          setIsStrictModeForDevtools(false);
        }
      }
    }

    var state = workInProgress.memoizedState = instance.state !== null && instance.state !== undefined ? instance.state : null;
    adoptClassInstance(workInProgress, instance);