cmd/pkgserver: enable TypeScript's strict mode

cmd/pkgserver/ui/static/index.ts

@@ -1,4 +1,10 @@
-class PackageIndexEntry {
+function assertGetElementById(id: string): HTMLElement {
+    let elem = document.getElementById(id)
+    if(elem == null) throw new ReferenceError(`element with ID '${id}' missing from DOM`)
+    return elem
+}
+
+interface PackageIndexEntry {
     name: string
     size: number | null
     description: string | null
@@ -34,7 +40,7 @@ function toByteSizeString(bytes: number): string {
 
 const API_VERSION = 1
 const ENDPOINT = `/api/v${API_VERSION}`
-class InfoPayload {
+interface InfoPayload {
     count: number
     hakurei_version: string
 }
@@ -42,9 +48,9 @@ class InfoPayload {
 async function infoRequest(): Promise<InfoPayload> {
     const res = await fetch(`${ENDPOINT}/info`)
     const payload = await res.json()
-    return payload as InfoPayload
+    return payload
 }
-class GetPayload {
+interface GetPayload {
     values: PackageIndexEntry[]
 }
 
@@ -57,7 +63,7 @@ enum SortOrders {
 async function getRequest(limit: number, index: number, sort: SortOrders): Promise<GetPayload> {
     const res = await fetch(`${ENDPOINT}/get?limit=${limit}&index=${index}&sort=${sort.valueOf()}`)
     const payload = await res.json()
-    return payload as GetPayload
+    return payload
 }
 class State {
     entriesPerPage: number = 10
@@ -96,16 +102,16 @@ class State {
     }
     updatePage() {
         let page = Math.ceil(((this.getEntryIndex() + this.getEntriesPerPage()) - 1) / this.getEntriesPerPage())
-        document.getElementById("page-number").innerText = String(page)
+        assertGetElementById("page-number").innerText = String(page)
     }
     updateRange() {
         let max = Math.min(this.getEntryIndex() + this.getEntriesPerPage(), this.getMaxEntries())
-        document.getElementById("entry-counter").innerText = `${this.getEntryIndex() + 1}-${max} of ${this.getMaxEntries()}`
+        assertGetElementById("entry-counter").innerText = `${this.getEntryIndex() + 1}-${max} of ${this.getMaxEntries()}`
     }
     updateListings() {
         getRequest(this.getEntriesPerPage(), this.getEntryIndex(), this.getSortOrder())
             .then(res => {
-                let table = document.getElementById("pkg-list")
+                let table = assertGetElementById("pkg-list")
                 table.innerHTML = ''
                 res.values.forEach((row) => {
                     table.appendChild(toHTML(row))
@@ -141,15 +147,15 @@ document.addEventListener("DOMContentLoaded", () => {
     infoRequest()
         .then(res => {
             STATE.setMaxEntries(res.count)
-            document.getElementById("hakurei-version").innerText = res.hakurei_version
+            assertGetElementById("hakurei-version").innerText = res.hakurei_version
             STATE.updateRange()
             STATE.updateListings()
         })
 
-    document.getElementById("count").addEventListener("change", (event) => {
+    assertGetElementById("count").addEventListener("change", (event) => {
         STATE.setEntriesPerPage(parseInt((event.target as HTMLSelectElement).value))
     })
-    document.getElementById("sort").addEventListener("change", (event) => {
+    assertGetElementById("sort").addEventListener("change", (event) => {
         STATE.setSortOrder(parseInt((event.target as HTMLSelectElement).value))
     })
-})
+})