Add summary section to index.

data/parser/summary.js

@@ -0,0 +1,41 @@
+
+import mkdirp from 'mkdirp'
+import path from 'path'
+import fsp from 'fs/promises'
+
+async function readJSON(file) {
+  return JSON.parse(await fsp.readFile(file, 'utf-8'))
+}
+
+export default async function process () {
+  const testing = await readJSON('./public/data/overall/testing/by-county/-- All --.json')
+  const cases = await readJSON('./public/data/overall/cases/by-county/-- All --.json')
+  const hospitalizations = await readJSON('./public/data/overall/hospitalizations/by-county/-- All --.json')
+  const deaths = await readJSON('./public/data/overall/deaths/by-county/-- All --.json')
+
+  const summary = {
+    last_report_date: testing.rows.at(-1)[0],
+    testing: {
+      headers: testing.headers,
+      current: testing.rows.at(-1),
+      prev: testing.rows.at(-2),
+    },
+    cases: {
+      headers: cases.headers,
+      current: cases.rows.at(-1),
+      prev: cases.rows.at(-2),
+    },
+    hospitalizations: {
+      headers: hospitalizations.headers,
+      current: hospitalizations.rows.at(-1),
+      prev: hospitalizations.rows.at(-2),
+    },
+    deaths: {
+      headers: deaths.headers,
+      current: deaths.rows.at(-1),
+      prev: deaths.rows.at(-2),
+    }
+  }
+
+  await fsp.writeFile('./public/data/summary.json', JSON.stringify(summary))
+}