fix: Don't print i18next internal options

src/index.ts

@@ -1,11 +1,20 @@
 import { PostProcessorModule } from 'i18next'
 
+const ignore = ['defaultValue', 'interpolation', 'lng', 'lngs', 'ns']
+
 export default {
   name: 'printKeys',
   type: 'postProcessor',
   process(_, key, options) {
-    return Object.keys(options).length
-      ? key + ' ' + JSON.stringify(options)
+    // Filter out internal i18next options when printing keys. The resulting
+    // array is passed to JSON.stringify which instructs it which keys should
+    // be printed.
+    const optionKeys = Object.keys(options).filter(
+      (key) => !ignore.includes(key)
+    )
+
+    return optionKeys.length
+      ? key + ' ' + JSON.stringify(options, optionKeys)
       : key.toString()
   },
 } as PostProcessorModule

test/printKeys.spec.ts

@@ -27,3 +27,10 @@ it('should print interpolated values after the key', () => {
   )
   expect(i18next.t('count', { count: 12 })).toBe('count {"count":12}')
 })
+
+it('should not print the internal options', () => {
+  expect(i18next.t('key', { defaultValue: 'hi' })).toBe('key')
+  expect(i18next.t('key', { lng: 'en-US' })).toBe('key')
+  expect(i18next.t('key', { lngs: ['en', 'es'] })).toBe('key')
+  expect(i18next.t('key', { interpolation: {} })).toBe('key')
+})

tsconfig.json

@@ -2,6 +2,7 @@
   "compilerOptions": {
     "module": "CommonJS",
     "target": "ES6",
+    "lib": ["ESNext"],
     "moduleResolution": "node",
     "esModuleInterop": true,
     "removeComments": true,