From 62e8d209681f64fed44fa610c20cd1eb47dfcbf8 Mon Sep 17 00:00:00 2001
From: Mike Bostock <mbostock@gmail.com>
Date: Wed, 26 May 2021 19:40:43 -0700
Subject: [PATCH 1/2] XLSX

---
 src/fileAttachment.js |  5 +++++
 src/xlsx.js           | 20 ++++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 src/xlsx.js

diff --git a/src/fileAttachment.js b/src/fileAttachment.js
index a1da5bb9..7f3faceb 100644
--- a/src/fileAttachment.js
+++ b/src/fileAttachment.js
@@ -1,5 +1,6 @@
 import {require as requireDefault} from "d3-require";
 import sqlite, {SQLiteDatabaseClient} from "./sqlite.js";
+import xlsx, {XlsxWorkbook} from "./xlsx.js";
 
 async function remote_fetch(file) {
   const response = await fetch(await file.url());
@@ -62,6 +63,10 @@ class FileAttachment {
     const db = new SQL.Database(new Uint8Array(buffer));
     return new SQLiteDatabaseClient(db);
   }
+  async xlsx() {
+    const [XLSX, buffer] = await Promise.all([xlsx(requireDefault), this.arrayBuffer()]);
+    return new XlsxWorkbook(await XLSX.read(buffer, {type: "buffer"}));
+  }
 }
 
 export function NoFileAttachments(name) {
diff --git a/src/xlsx.js b/src/xlsx.js
new file mode 100644
index 00000000..9a822280
--- /dev/null
+++ b/src/xlsx.js
@@ -0,0 +1,20 @@
+let XLSX; // set lazily
+
+export default async function xslx(require) {
+  return XLSX = await require("xlsx@0.17.0/dist/xlsx.mini.min.js");
+}
+
+export class XlsxWorkbook {
+  constructor(workbook) {
+    Object.defineProperties(this, {
+      _: {value: workbook}
+    });
+  }
+  sheetNames() {
+    return this._.SheetNames.slice();
+  }
+  sheet(name, options) {
+    if (!Object.prototype.hasOwnProperty.call(this._.Sheets, name)) throw new Error("unknown sheet");
+    return XLSX.utils.sheet_to_json(this._.Sheets[name], options);
+  }
+}

From b842a0231243c96c45abc4a2294f6abfafe1f151 Mon Sep 17 00:00:00 2001
From: Mike Bostock <mbostock@gmail.com>
Date: Thu, 27 May 2021 14:35:46 -0700
Subject: [PATCH 2/2] options = {cellDates: true}

---
 .eslintrc.json        | 2 +-
 src/fileAttachment.js | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/.eslintrc.json b/.eslintrc.json
index a4fd4c85..1fef0810 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -2,7 +2,7 @@
   "extends": "eslint:recommended",
   "parserOptions": {
     "sourceType": "module",
-    "ecmaVersion": 8
+    "ecmaVersion": 9
   },
   "env": {
     "browser": true,
diff --git a/src/fileAttachment.js b/src/fileAttachment.js
index 7f3faceb..fe731633 100644
--- a/src/fileAttachment.js
+++ b/src/fileAttachment.js
@@ -63,9 +63,9 @@ class FileAttachment {
     const db = new SQL.Database(new Uint8Array(buffer));
     return new SQLiteDatabaseClient(db);
   }
-  async xlsx() {
+  async xlsx(options) {
     const [XLSX, buffer] = await Promise.all([xlsx(requireDefault), this.arrayBuffer()]);
-    return new XlsxWorkbook(await XLSX.read(buffer, {type: "buffer"}));
+    return new XlsxWorkbook(await XLSX.read(buffer, {cellDates: true, ...options, type: "buffer"}));
   }
 }