Function createInstance

packages/react-noop-renderer/src/createReactNoop.js:399–453

(
      type: string,
      props: Props,
      rootContainerInstance: Container,
      hostContext: HostContext,
      internalInstanceHandle: Object,
    )

    },

    createInstance(
      type: string,
      props: Props,
      rootContainerInstance: Container,
      hostContext: HostContext,
      internalInstanceHandle: Object,
    ): Instance {
      if (type === 'errorInCompletePhase') {
        throw new Error('Error in host config.');
      }
      if (__DEV__) {
        // The `if` statement here prevents auto-disabling of the safe coercion
        // ESLint rule, so we must manually disable it below.
        if (shouldSetTextContent(type, props)) {
          checkPropStringCoercion(props.children, 'children');
        }
      }
      const inst = {
        id: instanceCounter++,
        type: type,
        children: [],
        parent: -1,
        text: shouldSetTextContent(type, props)
          ? // eslint-disable-next-line react-internal/safe-string-coercion
            computeText((props.children: any) + '', hostContext)
          : null,
        prop: props.prop,
        hidden: !!props.hidden,
        context: hostContext,
      };

      if (type === 'suspensey-thing' && typeof props.src === 'string') {
        inst.src = props.src;
      }

      // Hide from unit tests
      Object.defineProperty(inst, 'id', {value: inst.id, enumerable: false});
      Object.defineProperty(inst, 'parent', {
        value: inst.parent,
        enumerable: false,
      });
      Object.defineProperty(inst, 'text', {
        value: inst.text,
        enumerable: false,
      });
      Object.defineProperty(inst, 'context', {
        value: inst.context,
        enumerable: false,
      });
      Object.defineProperty(inst, 'fiber', {
        value: internalInstanceHandle,
        enumerable: false,
      });
      return inst;
    },

    cloneMutableInstance(instance: Instance, keepChildren: boolean): Instance {
      throw new Error('Not yet implemented.');