How to use the core-js.Object.assign function in core-js

clear = () => {
    this.setState({ data: Object.assign({}) });
  };

this.setState(({ data }) => {
      _Set(data, name, value);

      const newData = Object.assign({}, data);

      return {
        data: newData,
        modified: true,
      };
    });
  };

handleSubmit = async () => {
    let requestData = {
      sayId: 1,
      commentType: 2,
      content: this.state.editorContent
    }
    if (this.state.commentId) {
      Object.assign(requestData, {
        toId: this.state.applyPerson.id,
        commentId: this.state.commentId
      })
    }
    const res = await api.subComment({ data: requestData })
    if (res.data.code === 0) {
      this.handleCancelApply()
      this.loadData()
      this.editor.txt.clear()
      message.success('发布成功')
    }
  }