Next.js does not recognize custom npm package

Question

Here's my personal custom package structure:

package.json
Posts.js

And here's the content of Posts.js:

const Posts = () => {
    return <div>List of posts</div>
}

export default Posts;

I publish this to my GitHub Package Registry and I install it to a next.js app using npm install @myOwnerName:blog.

And I can verify that it's been installed.

However, when I want to use it using import Posts from '@myOwnerName/blog/Posts', I see this error:

Failed to compile
./node_modules/@myOwnerUser/blog/Posts.js
Module parse failed: Unexpected token (2:11)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
| const Posts = () => {
>     return <div>List of posts</div>
| }
|

What have I done wrong?

Answer 1

Before publish npm package, we should compile react components to es-module. So, in webpack configuration, unknown file type error. I think, it is more correct way to compile react component before publish it.

Answer 2

You need to first import the DataTable into the cells and then create a Table from those cells.

For example, like this:

// Sample DataTable.
var dataTable = new DataTable();

dataTable.Columns.Add("ID", typeof(int));
dataTable.Columns.Add("FirstName", typeof(string));
dataTable.Columns.Add("LastName", typeof(string));

dataTable.Rows.Add(new object[] { 100, "John", "Doe" });
dataTable.Rows.Add(new object[] { 101, "Fred", "Nurk" });
dataTable.Rows.Add(new object[] { 103, "Hans", "Meier" });
dataTable.Rows.Add(new object[] { 104, "Ivan", "Horvat" });
dataTable.Rows.Add(new object[] { 105, "Jean", "Dupont" });
dataTable.Rows.Add(new object[] { 106, "Mario", "Rossi" });

// New ExcelFile or use ExcelFile.Load for existing file.
var workbook = new ExcelFile();
var worksheet = workbook.Worksheets.Add("Sheet1");

// Insert DataTable to an Excel worksheet.
var options = new InsertDataTableOptions() { ColumnHeaders = true };
worksheet.InsertDataTable(dataTable, options);

// Create an Excel table.
string range = $"A1:{CellRange.RowColumnToPosition(dataTable.Rows.Count, dataTable.Columns.Count - 1)}";
var table = worksheet.Tables.Add("Table1", range, true);
table.BuiltInStyle = BuiltInTableStyleName.TableStyleLight10;

// Save as XLSX file.
workbook.Save("output.xlsx");