diff --git a/src/client/configs.ts b/src/client/configs.ts
index fdab4ba..d15a0d8 100644
--- a/src/client/configs.ts
+++ b/src/client/configs.ts
@@ -13,6 +13,7 @@ interface Options {
   initialLocale: string
   formats: Formats
   loadingDelay: number
+  warnOnMissingMessages: boolean
 }
 
 export const defaultFormats: Formats = {
@@ -51,6 +52,7 @@ export const defaultOptions: Options = {
   initialLocale: null,
   loadingDelay: 200,
   formats: defaultFormats,
+  warnOnMissingMessages: true,
 }
 
 const options: Options = defaultOptions
@@ -60,30 +62,26 @@ export function getOptions() {
 }
 
 export function init(opts: ConfigureOptions) {
-  const fallbackLocale = (options.fallbackLocale = opts.fallbackLocale)
-
+  const { formats, ...rest } = opts
   const initialLocale = opts.initialLocale
     ? typeof opts.initialLocale === 'string'
       ? opts.initialLocale
-      : getClientLocale(opts.initialLocale) || fallbackLocale
-    : fallbackLocale
+      : getClientLocale(opts.initialLocale) || opts.fallbackLocale
+    : opts.fallbackLocale
 
-  $locale.set(initialLocale)
-  options.initialLocale = initialLocale
+  Object.assign(options, rest, { initialLocale })
 
-  if (opts.formats) {
-    if ('number' in opts.formats) {
-      Object.assign(options.formats.number, opts.formats.number)
+  if (formats) {
+    if ('number' in formats) {
+      Object.assign(options.formats.number, formats.number)
     }
-    if ('date' in opts.formats) {
-      Object.assign(options.formats.date, opts.formats.date)
+    if ('date' in formats) {
+      Object.assign(options.formats.date, formats.date)
     }
-    if ('time' in opts.formats) {
-      Object.assign(options.formats.time, opts.formats.time)
+    if ('time' in formats) {
+      Object.assign(options.formats.time, formats.time)
     }
   }
 
-  if (opts.loadingDelay != null) {
-    options.loadingDelay = opts.loadingDelay
-  }
+  return $locale.set(initialLocale)
 }
diff --git a/src/client/stores/format.ts b/src/client/stores/format.ts
index f85ee70..9628a1b 100644
--- a/src/client/stores/format.ts
+++ b/src/client/stores/format.ts
@@ -10,6 +10,7 @@ import {
   getDateFormatter,
   getNumberFormatter,
 } from '../includes/formatters'
+import { getOptions } from '../configs'
 
 import { $dictionary } from './dictionary'
 import { getCurrentLocale, getRelatedLocalesOf, $locale } from './locale'
@@ -31,15 +32,18 @@ const formatMessage: Formatter = (id, options = {}) => {
   const message = lookupMessage(id, locale)
 
   if (!message) {
-    console.warn(
-      `[svelte-i18n] The message "${id}" was not found in "${getRelatedLocalesOf(
-        locale
-      ).join('", "')}". ${
-        hasLocaleQueue(getCurrentLocale())
-          ? `\n\nNote: there are at least one loader still registered to this locale that wasn't executed.`
-          : ''
-      }`
-    )
+    if (getOptions().warnOnMissingMessages) {
+      // istanbul ignore next
+      console.warn(
+        `[svelte-i18n] The message "${id}" was not found in "${getRelatedLocalesOf(
+          locale
+        ).join('", "')}".${
+          hasLocaleQueue(getCurrentLocale())
+            ? `\n\nNote: there are at least one loader still registered to this locale that wasn't executed.`
+            : ''
+        }`
+      )
+    }
 
     return defaultValue || id
   }