refactor: some minor changes

src/cli/extract.ts

@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-non-null-assertion */
 import type {
   Node,
   ObjectExpression,
@@ -145,7 +146,7 @@ export function collectMessages(markup: string): Message[] {
     ...definitions.map((definition) => getObjFromExpression(definition)),
     ...calls.map((call) => {
       const [pathNode, options] = call.arguments;
-      let messageObj: Partial<Message>;
+      let messageObj: Message;
 
       if (pathNode.type === 'ObjectExpression') {
         // _({ ...opts })
@@ -168,7 +169,7 @@ export function collectMessages(markup: string): Message[] {
 
       return messageObj;
     }),
-  ].filter((Boolean as unknown) as (x: Message | null) => x is Message);
+  ].filter(Boolean) as Message[];
 }
 
 export function extractMessages(

src/cli/includes/getObjFromExpression.ts

@@ -2,10 +2,8 @@ import type { ObjectExpression, Property, Identifier } from 'estree';
 
 import type { Message } from '../types';
 
-export function getObjFromExpression(
-  exprNode: ObjectExpression,
-): Partial<Message> {
-  return exprNode.properties.reduce<Partial<Message>>((acc, prop: Property) => {
+export function getObjFromExpression(exprNode: ObjectExpression): Message {
+  return exprNode.properties.reduce((acc, prop: Property) => {
     // we only want primitives
     if (
       prop.value.type === 'Literal' &&
@@ -17,5 +15,5 @@ export function getObjFromExpression(
     }
 
     return acc;
-  }, {});
+  }, {} as Message);
 }

src/cli/types/index.ts

@@ -1,5 +1,5 @@
 export interface Message {
   id: string;
-  default: string;
+  default?: string;
   [key: string]: any;
 }

src/runtime/configs.ts

@@ -38,13 +38,8 @@ export const defaultFormats: Formats = {
   },
 };
 
-export const defaultOptions: Omit<
-  ConfigureOptions,
-  'fallbackLocale' | 'initialLocale'
-> &
-  Record<'fallbackLocale' | 'initialLocale', null> = {
-  fallbackLocale: null,
-  initialLocale: null,
+export const defaultOptions: ConfigureOptions = {
+  fallbackLocale: null as any,
   loadingDelay: 200,
   formats: defaultFormats,
   warnOnMissingMessages: true,

src/runtime/includes/formatters.ts

@@ -1,4 +1,3 @@
-import type { Formats } from 'intl-messageformat';
 import IntlMessageFormat from 'intl-messageformat';
 
 import type {
@@ -35,8 +34,8 @@ const getIntlFormatterOptions = (
 ): any => {
   const { formats } = getOptions();
 
-  if (type in formats && name in (formats as Formats)[type]) {
-    return (formats as Formats)[type][name];
+  if (type in formats && name in formats[type]) {
+    return formats[type][name];
   }
 
   throw new Error(`[svelte-i18n] Unknown "${name}" ${type} format.`);
@@ -106,6 +105,7 @@ export const getTimeFormatter: MemoizedDateTimeFormatterFactoryOptional = ({
 } = {}) => createTimeFormatter({ locale, ...args });
 
 export const getMessageFormatter = monadicMemoize(
+  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
   (message: string, locale: string = getCurrentLocale()!) =>
     new IntlMessageFormat(message, locale, getOptions().formats, {
       ignoreTag: getOptions().ignoreTag,

src/runtime/includes/loaderQueue.ts

@@ -41,7 +41,9 @@ function getLocalesQueues(locale: string) {
     .filter(([, localeQueue]) => localeQueue.length > 0);
 }
 
-export function hasLocaleQueue(locale: string) {
+export function hasLocaleQueue(locale?: string | null) {
+  if (locale == null) return false;
+
   return getPossibleLocales(locale).some(
     (localeQueue) => getLocaleQueue(localeQueue)?.size,
   );

src/runtime/stores/dictionary.ts

@@ -5,7 +5,6 @@ import type { LocaleDictionary, LocalesDictionary } from '../types/index';
 import { getPossibleLocales } from './locale';
 import { delve } from '../../shared/delve';
 import { lookupCache } from '../includes/lookup';
-import { locales } from '..';
 
 let dictionary: LocalesDictionary;
 const $dictionary = writable<LocalesDictionary>({});

src/runtime/stores/formatters.ts

@@ -21,16 +21,18 @@ import { $dictionary } from './dictionary';
 import { getCurrentLocale, getPossibleLocales, $locale } from './locale';
 
 const formatMessage: MessageFormatter = (id, options = {}) => {
+  let messageObj = options as MessageObject;
+
   if (typeof id === 'object') {
-    options = id as MessageObject;
-    id = options.id!;
+    messageObj = id as MessageObject;
+    id = messageObj.id;
   }
 
   const {
     values,
     locale = getCurrentLocale(),
     default: defaultValue,
-  } = options;
+  } = messageObj;
 
   if (locale == null) {
     throw new Error(
@@ -47,7 +49,7 @@ const formatMessage: MessageFormatter = (id, options = {}) => {
         `[svelte-i18n] The message "${id}" was not found in "${getPossibleLocales(
           locale,
         ).join('", "')}".${
-          hasLocaleQueue(getCurrentLocale()!)
+          hasLocaleQueue(getCurrentLocale())
             ? `\n\nNote: there are at least one loader still registered to this locale that wasn't executed.`
             : ''
         }`,
@@ -90,8 +92,11 @@ const formatNumber: NumberFormatter = (n, options) => {
   return getNumberFormatter(options).format(n);
 };
 
-const getJSON: JSONGetter = (id: string, locale = getCurrentLocale()): any => {
-  return lookup(id, locale);
+const getJSON: JSONGetter = <T = any>(
+  id: string,
+  locale = getCurrentLocale(),
+) => {
+  return lookup(id, locale) as T;
 };
 
 export const $format = derived([$locale, $dictionary], () => formatMessage);

src/runtime/stores/locale.ts

@@ -29,11 +29,11 @@ export function getPossibleLocales(
 }
 
 export function getCurrentLocale() {
-  return current;
+  return current ?? undefined;
 }
 
 internalLocale.subscribe((newLocale: string | null | undefined) => {
-  current = newLocale;
+  current = newLocale ?? undefined;
 
   if (typeof window !== 'undefined' && newLocale != null) {
     document.documentElement.setAttribute('lang', newLocale);
@@ -42,9 +42,8 @@ internalLocale.subscribe((newLocale: string | null | undefined) => {
 
 const set = (newLocale: string | null | undefined): void | Promise<void> => {
   if (
-    ((getClosestAvailableLocale as unknown) as (
-      refLocale: string | null | undefined,
-    ) => refLocale is string)(newLocale) &&
+    newLocale &&
+    getClosestAvailableLocale(newLocale) &&
     hasLocaleQueue(newLocale)
   ) {
     const { loadingDelay } = getOptions();
@@ -66,7 +65,7 @@ const set = (newLocale: string | null | undefined): void | Promise<void> => {
       $isLoading.set(true);
     }
 
-    return flush(newLocale)
+    return flush(newLocale as string)
       .then(() => {
         internalLocale.set(newLocale);
       })

src/runtime/types/index.ts

@@ -26,16 +26,16 @@ export type InterpolationValues =
   | undefined;
 
 export interface MessageObject {
-  id?: string;
-  locale?: string | null;
+  id: string;
+  locale?: string;
   format?: string;
   default?: string;
   values?: InterpolationValues;
 }
 
 export type MessageFormatter = (
   id: string | MessageObject,
-  options?: MessageObject,
+  options?: Omit<MessageObject, 'id'>,
 ) => string;
 
 export type TimeFormatter = (
@@ -53,11 +53,11 @@ export type NumberFormatter = (
   options?: IntlFormatterOptions<Intl.NumberFormatOptions>,
 ) => string;
 
-export type JSONGetter = (id: string, locale?: string | null) => any;
+export type JSONGetter = <T>(id: string, locale?: string | null) => T;
 
 type IntlFormatterOptions<T> = T & {
   format?: string;
-  locale?: string | null;
+  locale?: string;
 };
 
 export interface MemoizedIntlFormatter<T, U> {
@@ -74,8 +74,8 @@ export interface MessagesLoader {
 
 export interface ConfigureOptions {
   fallbackLocale: string;
-  formats: Partial<Formats>;
-  initialLocale: string;
+  initialLocale?: string | null;
+  formats: Formats;
   loadingDelay: number;
   warnOnMissingMessages: boolean;
   ignoreTag: boolean;

test/runtime/includes/utils.test.ts

@@ -8,13 +8,16 @@ import {
 
 describe('getting client locale', () => {
   beforeEach(() => {
-    delete (window as any).location;
+    // @ts-expect-error - TS doesn't know this is a fake window object
+    delete window.location;
+
+    // @ts-expect-error - TS doesn't know this is a fake window object
     window.location = {
       pathname: '/',
       hostname: 'example.com',
       hash: '',
       search: '',
-    } as any;
+    };
   });
 
   it('gets the locale based on the passed hash parameter', () => {

test/runtime/stores/locale.test.ts

@@ -90,7 +90,6 @@ test('if no initial locale is set, set the locale to the fallback', () => {
 test('if no initial locale was found, set to the fallback locale', () => {
   init({
     fallbackLocale: 'en',
-    initialLocale: null as any,
   });
   expect(get($locale)).toBe('en');
   expect(getOptions().fallbackLocale).toBe('en');