feat: add Dutch spellcheck dictionary

frontend/package.json

@@ -8,6 +8,7 @@
     "dev": "vite",
     "prebuild": "node scripts/copy-dictionaries.mjs",
     "build": "vite build",
+    "test": "node --test scripts/*.test.mjs",
     "preview": "vite preview",
     "check": "svelte-check --tsconfig ./tsconfig.json",
     "lint": "eslint .",
@@ -41,6 +42,7 @@
     "dictionary-fr": "^3.0.0",
     "dictionary-it": "^2.0.0",
     "dictionary-nb": "^3.0.0",
+    "dictionary-nl": "^2.0.0",
     "fflate": "^0.8.3",
     "nspell": "^2.1.5",
     "svelte-i18n": "^4.0.1",

frontend/package.json.md5

@@ -1 +1 @@
-48a90fd1c3ac1a9e4f4707bb63114d36
+41981e805c2980f748c8242e519ab085

frontend/scripts/copy-dictionaries.mjs

@@ -13,9 +13,9 @@ const scriptsDir = dirname(fileURLToPath(import.meta.url))
 const frontend = dirname(scriptsDir)
 const outDir = join(frontend, 'public', 'spellcheck')
 
-// Latin-script locales Aerion ships translations for. zh-* excluded (CJK has no
+// Latin-script locales Aerion ships dictionaries for. zh-* excluded (CJK has no
 // Latin-style per-word spelling); vi omitted until a usable dictionary exists.
-const LOCALES = ['en', 'cs', 'de', 'fr', 'it', 'nb']
+const LOCALES = ['en', 'cs', 'de', 'fr', 'it', 'nb', 'nl']
 
 await rm(outDir, { recursive: true, force: true })
 await mkdir(outDir, { recursive: true })

frontend/scripts/spellcheck.test.mjs

@@ -0,0 +1,31 @@
+import assert from 'node:assert/strict'
+import { readFile } from 'node:fs/promises'
+import test from 'node:test'
+import nspell from 'nspell'
+import { gunzipSync } from 'node:zlib'
+
+async function dutchDictionary() {
+  const [aff, dic] = await Promise.all([
+    readFile(new URL('../node_modules/dictionary-nl/index.aff', import.meta.url), 'utf8'),
+    readFile(new URL('../node_modules/dictionary-nl/index.dic', import.meta.url), 'utf8'),
+  ])
+  return nspell(aff, dic)
+}
+
+test('Dutch dictionary recognizes Dutch words and rejects a typo', async () => {
+  const spell = await dutchDictionary()
+
+  assert.equal(spell.correct('huis'), true)
+  assert.equal(spell.correct('huiss'), false)
+  assert.ok(spell.suggest('huiss').includes('huis'))
+})
+
+test('Dutch browser assets contain the dictionary files', async () => {
+  const [aff, dic] = await Promise.all([
+    readFile(new URL('../public/spellcheck/nl.aff.gz', import.meta.url)),
+    readFile(new URL('../public/spellcheck/nl.dic.gz', import.meta.url)),
+  ])
+
+  assert.match(gunzipSync(aff).toString('utf8'), /Dutch support for Hunspell/)
+  assert.match(gunzipSync(dic).toString('utf8'), /\nhuis-\n/)
+})

frontend/src/lib/components/settings/ComposerTab.svelte

@@ -43,7 +43,7 @@
   // Dictionaries Aerion ships, with their native display names.
   const dictLanguages = SPELLCHECK_DICTS.map((code) => ({
     code,
-    name: supportedLocales.find((l) => l.code === code)?.name ?? code,
+    name: supportedLocales.find((l) => l.code === code)?.name ?? (code === 'nl' ? 'Nederlands' : code),
   }))
 
   // Added-words list — read straight from the store (persists immediately on

frontend/src/lib/spellcheck/locales.ts

@@ -10,10 +10,11 @@ const APP_TO_DICT: Record<string, string> = {
   fr: 'fr',
   it: 'it',
   nb: 'nb',
+  nl: 'nl',
 }
 
 // Dictionaries bundled as static assets under /spellcheck/<key>.{aff,dic}.
-export const SPELLCHECK_DICTS = ['en', 'cs', 'de', 'fr', 'it', 'nb'] as const
+export const SPELLCHECK_DICTS = ['en', 'cs', 'de', 'fr', 'it', 'nb', 'nl'] as const
 
 export function appLocaleToDict(locale: string | null | undefined): string | null {
   if (!locale) return null