refactor fragment aliases & add field lookup checking

why is that not the default

Makefile

@@ -50,7 +50,7 @@ $(BUILDDIR)/%: $(TMPDIR)/%
 
 $(TMPDIR)/%.js: %.ts
 	echo "[tsc]     "$@
-	tsc --strict --noEmitOnError \
+	tsc --strict --noUncheckedIndexedAccess --noEmitOnError \
 	    --lib dom,es2021 --target es2015 \
 	    --outDir $(dir $@) $^
 

script/gallery.ts

@@ -106,23 +106,30 @@ function makeFragment() {
   }
 }
 
+type Shortcuts = { [short: string]: Set<string> };
+const shortcuts: Shortcuts = {
+  'summary':        new Set('require_artsummary'),
+  'colourexamples': new Set('require_colourexample'),
+  'flatexamples':   new Set('require_flatexample'),
+  'sketchexamples': new Set('require_sketchexample'),
+  'iconexamples':   new Set('require_iconexample'),
+  'curated':        new Set('require_curated')
+};
+
 function useFragment() {
   const frag = decodeURIComponent(location.hash).replace(/^#/, '');
   const details = document.getElementById('filters-details') as HTMLDetailsElement;
+  const fromShortcut = shortcuts[frag];
 
   if (!frag) {
     clearForm();
   } else if (frag == 'all') {
     allBoxes.forEach(b => b.checked = false);
     details.open = false;
+  } else if (fromShortcut) {
+    allBoxes.forEach(b => b.checked = fromShortcut.has(b.id));
   } else {
-    const pieces =
+    const pieces = frag.split(';');
-      frag == 'summary'        ? ['require_artsummary'] :
-      frag == 'colourexamples' ? ['require_colourexample'] :
-      frag == 'flatexamples'   ? ['require_flatexample'] :
-      frag == 'sketchexamples' ? ['require_sketchexample'] :
-      frag == 'iconexamples'   ? ['require_iconexample'] :
-      frag == 'curated'        ? ['require_curated'] : frag.split(';');
     const set = new Set(pieces);
     const re = /^(require|exclude)_|hide_filters/;
     if (pieces.every(x => re.test(x))) {
@@ -154,7 +161,7 @@ function sortFilters(cmp: (a: Node, b: Node) => number) {
 function sortFiltersAlpha(e: Event) {
   function getName(node: Node): string {
     if (node instanceof Element) {
-      return node.getElementsByTagName('input')[0].value;
+      return node.getElementsByTagName('input')[0]?.value ?? '';
     } else {
       return '';
     }
@@ -164,9 +171,9 @@ function sortFiltersAlpha(e: Event) {
 }
 
 function sortFiltersUses(e: Event) {
-  function getUses(node: Node) {
+  function getUses(node: Node): number {
     if (node instanceof Element) {
-      const countStr = node.getElementsByTagName('label')[0].dataset.count;
+      const countStr = node.getElementsByTagName('label')[0]?.dataset.count;
       return countStr ? +countStr : 0;
     } else {
       return 0;

tsconfig.json

@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
     "strict": true,
+    "noUncheckedIndexedAccess": true,
     "noEmitOnError": true,
     "lib": ["ES2021", "dom"],
     "target": "ES2015"