fix: correct last typescript errors + add ci check (#578)

Author: chambo-e

.github/workflows/ci.yml

@@ -3,6 +3,18 @@ name: CI
 on: push
 
 jobs:
+  typecheck:
+    runs-on: ubuntu-20.04
+    steps:
+    - uses: actions/[email protected]
+    - name: Use Node.js
+      uses: actions/[email protected]
+      with:
+        node-version: 17
+        cache: 'yarn'
+    - run: yarn
+    - run: yarn run build
+    - run: yarn run tsc --noEmit
   lint:
     runs-on: ubuntu-20.04
     steps:

packages/use-i18n/src/__tests__/formatDate.ts

@@ -27,17 +27,17 @@ const tests = [
       '2020-02-13T15:28:00.000Z',
     ])
   ]),
-].flat()
+].flat() as [FormatDateOptions, string, string, Date | string | number][]
 
 describe('formatDate', () => {
   test.each(tests)('should work with format "%s", for date = "%s" and locale "%s"', (format, _, locale, date) => {
     expect(
-      formatDate(locale as string, date, format as FormatDateOptions),
+      formatDate(locale, date, format),
     ).toMatchSnapshot()
   })
 
   test.each(locales)('should work with custom format and locale %s', (locale) => {
-    const format = {
+    const format: FormatDateOptions = {
       day: "numeric",
       era: "short",
       hour: "2-digit",