Feature: Add option overwrite-default, to be able to opt out of overwriting the default locale

Author: testower

.all-contributorsrc

@@ -132,6 +132,15 @@
       "contributions": [
         "example"
       ]
+    },
+    {
+      "login": "testower",
+      "name": "Tom Erik Støwer",
+      "avatar_url": "https://avatars2.githubusercontent.com/u/231492?v=4",
+      "profile": "https://github.com/testower",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "repoType": "github",

cli.js

@@ -11,11 +11,12 @@ const cli = meow(
   $ extract-messages <input>
 
   Options
-  -o, --output          Output directory [require: true]
-  -l, --locales         locales [require: true]
-  -f, --format          json | yaml [default: json]
-  -d, --default-locale  default locale
-  --flat                json [default: true] | yaml [default: false]
+  -o, --output            Output directory [require: true]
+  -l, --locales           locales [require: true]
+  -f, --format            json | yaml [default: json]
+  -d, --default-locale    default locale
+  -w, --overwrite-default default: false
+  --flat                  json [default: true] | yaml [default: false]
 
   Example
   $ extract-messages --locales=ja,en --output app/translations 'app/**/*.js'
@@ -47,6 +48,10 @@ const cli = meow(
         type: 'boolean',
         default: false
       },
+      'overwrite-default': {
+        type: 'boolean',
+        default: true
+      },
       // babel-plugin-react-intl boolean options
       enforceDescriptions: {
         type: 'boolean',

readme.md

@@ -4,7 +4,7 @@
 [![tested with jest](https://img.shields.io/badge/tested_with-jest-99424f.svg)](https://github.com/facebook/jest)
 [![styled with prettier](https://img.shields.io/badge/styled_with-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
 [![MIT License](https://img.shields.io/npm/l/nps.svg?style=flat-square)](./license)
-[![All Contributors](https://img.shields.io/badge/all_contributors-13-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-14-orange.svg?style=flat-square)](#contributors-)
 
 This package will generate json or yaml files from a glob. It will generate one file per locale, with the ids of each message defined by the [`defineMessages`](https://github.com/yahoo/react-intl/wiki/API#definemessages) function of [react-intl](https://github.com/yahoo/react-intl). The value of each of these keys will be an empty string, except for your `defaultLocale` which will be populated with the [`defaultMessage`](https://github.com/yahoo/react-intl/wiki/API#message-descriptor).
 
@@ -96,12 +96,12 @@ $ extract-messages --help
   $ extract-messages <input>
 
   Options
-  -o, --output       Output directory [require: true]
-  -l, --locales      locales [require: true]
-  -f, --format       json|yaml [default: json]
-  --flat             json [default: true] | yaml [default: false]
-  --default-locale   default locale [default: en]
-  --moduleSourceName module source name from where components are imported [default: react-intl]
+  -o, --output            Output directory [require: true]
+  -l, --locales           locales [require: true]
+  -f, --format            json | yaml [default: json]
+  -d, --default-locale    default locale
+  -w, --overwrite-default default: false
+  --flat                  json [default: true] | yaml [default: false]
 
   Example
   $ extract-messages --locales=ja,en --output app/translations 'app/**/*.js'
@@ -163,6 +163,13 @@ Default: `json`
 
 Set extension to output.
 
+##### overwriteDefault
+
+Type: `boolean`<br>
+Default: true
+
+If overwriteDefault is `false`, it will not overwrite messages in the default locale.
+
 ##### flat
 
 Type: `boolean`<br>
@@ -201,6 +208,7 @@ Thanks goes to these wonderful people ([emoji key](https://github.com/kentcdodds
     <td align="center"><a href="http://ddem.us/"><img src="https://avatars1.githubusercontent.com/u/290457?v=4" width="100px;" alt="Gregor MacLennan"/><br /><sub><b>Gregor MacLennan</b></sub></a><br /><a href="https://github.com/akameco/extract-react-intl-messages/commits?author=gmaclennan" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/zarv1k"><img src="https://avatars1.githubusercontent.com/u/6296643?v=4" width="100px;" alt="Dmitry Zarva"/><br /><sub><b>Dmitry Zarva</b></sub></a><br /><a href="https://github.com/akameco/extract-react-intl-messages/commits?author=zarv1k" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/panpanc"><img src="https://avatars2.githubusercontent.com/u/29132669?v=4" width="100px;" alt="Michael Pan"/><br /><sub><b>Michael Pan</b></sub></a><br /><a href="#example-panpanc" title="Examples">💡</a></td>
+    <td align="center"><a href="https://webstep.no"><img src="https://avatars2.githubusercontent.com/u/231492?v=4" width="100px;" alt="Tom Erik Støwer"/><br /><sub><b>Tom Erik Støwer</b></sub></a><br /><a href="https://github.com/akameco/extract-react-intl-messages/commits?author=testower" title="Code">💻</a></td>
   </tr>
 </table>
 

src/index.ts

@@ -75,6 +75,7 @@ const extractMessage = async (
     format = 'json',
     flat = isJson(format),
     defaultLocale = 'en',
+    overwriteDefault = true,
     ...opts
   }: Opts = {
     defaultLocale: 'en'
@@ -114,7 +115,7 @@ const extractMessage = async (
     locales.map(locale => {
       // If the default locale, overwrite the origin file
       let localeMap =
-        locale === defaultLocale
+        locale === defaultLocale && overwriteDefault
           ? // Create a clone so we can use only current valid messages below
             { ...oldLocaleMaps[locale], ...newLocaleMaps[locale] }
           : { ...newLocaleMaps[locale], ...oldLocaleMaps[locale] }