使用 SWC 打包表

SWC[^1] 是一个 JS 工具链。SWC 提供 spack（正式称为 "swcpack"）用于打包脚本。

¥SWC[^1] is a JS toolchain. SWC provides spack (formally called "swcpack") for bundling scripts.

SheetJS 是一个用于从电子表格读取和写入数据的 JavaScript 库。

¥SheetJS is a JavaScript library for reading and writing data from spreadsheets.

本演示使用 spack 和 SheetJS 导出数据。我们将探讨如何使用 spack 在站点中打包 SheetJS 以及如何将数据导出到电子表格。

¥This demo uses spack and SheetJS to export data. We'll explore how to bundle SheetJS in a site using spack and how to export data to spreadsheets.

该演示重点介绍与 spack 打包程序的集成细节。

¥This demo focuses on integration details with the spack bundler.

这些演示遵循 "导出教程"，其中更详细地介绍了 SheetJS 库的用法。

¥The demos follow the "Export Tutorial", which covers SheetJS library usage in more detail.

测试部署

本 demo 在以下环境下进行了测试：

¥This demo was tested in the following environments:

版本	日期
`1.2.246`	2024-04-27

集成详情

¥Integration Details

"构架" 章节涵盖了 Yarn 和其他包管理器的安装。

¥The "Frameworks" section covers installation with Yarn and other package managers.

在 SWC spack 项目中安装 SheetJS 模块后，import 语句可以加载库的相关部分。

¥After installing the SheetJS module in a SWC spack project, import statements can load relevant parts of the library.

导入数据的项目将使用 read[^2] 等方法解析工作簿，使用 sheet_to_json[^3] 从文件生成可用数据。由于 sheet_to_json 是 utils 对象的一部分，因此所需的导入为：

¥Projects that import data will use methods such as read[^2] to parse workbooks and sheet_to_json[^3] to generate usable data from files. As sheet_to_json is part of the utils object, the required import is:

import { read, utils } from 'xlsx';

导出数据的项目会使用 json_to_sheet[^4] 等方法生成工作表，使用 writeFile[^5] 导出文件。由于 json_to_sheet 是 utils 对象的一部分，因此所需的导入为：

¥Projects that export data will use methods such as json_to_sheet[^4] to generate worksheets and writeFile[^5] to export files. As json_to_sheet is part of the utils object, the required import is:

import { utils, writeFile } from 'xlsx';

当这个演示针对最新版本的 @swc/core 进行测试时，spack 崩溃了：

¥When this demo was tested against recent versions of @swc/core, spack crashed:

thread '<unnamed>' panicked at 'cannot access a scoped thread local variable without calling `set` first',

这是 SWC 中的一个错误

¥This is a bug in SWC

已知此错误会影响版本 1.3.100 和 1.4.17。

¥This bug is known to affect versions 1.3.100 and 1.4.17.

在 bug 修复之前，强烈建议使用 @swc/core@1.2.246。

¥Until the bug is fixed, it is strongly recommended to use @swc/core@1.2.246.

完整示例

¥Complete Example

初始化一个新项目：

¥Initialize a new project:

mkdir sheetjs-spack
cd sheetjs-spack
npm init -y

使用包管理器安装依赖：

¥Install the dependencies using a package manager:

npm
pnpm
Yarn

npm i --save https://cdn.sheetjs.com/xlsx-0.20.3/xlsx-0.20.3.tgz regenerator-runtime @swc/cli @swc/core@1.2.246

pnpm install --save https://cdn.sheetjs.com/xlsx-0.20.3/xlsx-0.20.3.tgz regenerator-runtime @swc/cli @swc/core@1.2.246

yarn add https://cdn.sheetjs.com/xlsx-0.20.3/xlsx-0.20.3.tgz regenerator-runtime @swc/cli @swc/core@1.2.246

regenerator-runtime 依赖用于转译 fetch，如果接口代码不使用 fetch 或 Promises，则不需要。

¥The regenerator-runtime dependency is used for transpiling fetch and is not required if the interface code does not use fetch or Promises.

将以下内容保存到 index.js：

¥Save the following to index.js:

index.js
import { utils, version, writeFileXLSX } from 'xlsx';

document.getElementById("xport").addEventListener("click", async() => {
/* fetch JSON data and parse */
const url = "https://xlsx.nodejs.cn/executive.json";
const raw_data = await (await fetch(url)).json();

/* filter for the Presidents */
const prez = raw_data.filter(row => row.terms.some(term => term.type === "prez"));

/* sort by first presidential term */
prez.forEach(row => row.start = row.terms.find(term => term.type === "prez").start);
prez.sort((l,r) => l.start.localeCompare(r.start));

/* flatten objects */
const rows = prez.map(row => ({
  name: row.name.first + " " + row.name.last,
  birthday: row.bio.birthday
}));

/* generate worksheet and workbook */
const worksheet = utils.json_to_sheet(rows);
const workbook = utils.book_new();
utils.book_append_sheet(workbook, worksheet, "Dates");

/* fix headers */
utils.sheet_add_aoa(worksheet, [["Name", "Birthday"]], { origin: "A1" });

/* calculate column width */
const max_width = rows.reduce((w, r) => Math.max(w, r.name.length), 10);
worksheet["!cols"] = [ { wch: max_width } ];

/* create an XLSX file and try to save to Presidents.xlsx */
writeFileXLSX(workbook, "Presidents.xlsx");
});

创建 spack.config.js 配置文件：

¥Create an spack.config.js config file:

spack.config.js
module.exports = ({
  entry: {
    'web': __dirname + '/index.js',
  },
  output: {
    path: __dirname + '/lib'
  },
  module: {},
});

为生产而构建：

¥Build for production:

npx spack

该命令将创建脚本 lib/web.js

¥This command will create the script lib/web.js

创建一个小的 HTML 页面来加载生成的脚本：

¥Create a small HTML page that loads the generated script:

index.html
<!DOCTYPE html>
<html lang="en">
  

<head></head>


  <body>
    <h1>SheetJS Presidents Demo</h1>
    <button id="xport">Click here to export</button>
    <script src="lib/web.js"></script>
  </body>
</html>