From https://docs.npmjs.com/files/package-lock.json#optional:

&gt; If true then this dependency is either an optional dependency ONLY of the top level module or a transitive dependency of one. This is false for dependencies that are both an optional dependency of the top level and a transitive dependency of a non-optional dependency of the top level.

It&#39;s safe to merge this change.

The reason you see this change is most likely because [npm slightly changed how package-lock.json is structured in version 6.6](https://github.com/npm/cli/pull/76). Your mate basically ran `npm install` with npm 6.6+ on a package-lock.json previously generated with npm 6.5-.

You should be able to avoid this kind of issue by making sure everyone on your team uses a recent version of `npm`.

After a package is removed from dependencies, its dependencies are marked `&quot;optional&quot;: true` in `package-lock.json`.

It is usually safe to remove such packages either by hand or by

    $ rm -rf package-lock.json node_modules/
    $ npm install

However, this is not 100% safe, as some packages will be updated to newer versions.

One of the reasons would be:

Some npm packages might require dependent packages(Eg minimist) to work in different OS. NPM marks this packages as optional on npm install, if at all, it is not required depending on OS you are using.

Please check the below issue:

Open Issue: package-lock.json and optional packages : https://github.com/npm/npm/issues/17722

Hope it helps.


I have an old project that supports multi-languages. I want to upgrade support library and target platform, **Before migrating to `Androidx` everything works fine but now change language not work!**

I use this code to change default locale of App

    private static Context updateResources(Context context, String language)
    {
    	Locale locale = new Locale(language);
    	Locale.setDefault(locale);
    
    	Configuration configuration = context.getResources().getConfiguration();
    	configuration.setLocale(locale);
    
    	return context.createConfigurationContext(configuration);
    }

And call this method on each activity by override `attachBaseContext` like this:

    @Override
    protected void attachBaseContext(Context newBase)
    {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
		String language = preferences.getString(SELECTED_LANGUAGE, &quot;fa&quot;);
    	super.attachBaseContext(updateResources(newBase, language));
    }

I try other method to get string and I noticed that ‍‍‍‍`getActivity().getBaseContext().getString` work and `getActivity().getString` not work. Even the following code does not work and always show `app_name` vlaue in default resource string.xml. 

	&lt;TextView
		android:id=&quot;@+id/textView&quot;
		android:layout_width=&quot;wrap_content&quot;
		android:layout_height=&quot;wrap_content&quot;
		android:text=&quot;@string/app_name&quot;/&gt;

I share a sample code in [https://github.com/Freydoonk/LanguageTest][1]

Also `getActivity()..getResources().getIdentifier` not work and always return 0!


  [1]: https://github.com/Freydoonk/LanguageTest

Change Locale not work after migrate to Androidx

I am getting following error in my Node-Express App 

&gt; UnhandledPromiseRejectionWarning: Unhandled promise rejection. This
&gt; error originated either by throwing inside of an async function
&gt; without a catch block, or by rejecting a promise which was not handled
&gt; with .catch(). (rejection id: 4)

To say the least, I have created a helper function which looks something like this 

    const getEmails = (userID, targettedEndpoint, headerAccessToken) =&gt; {
        return axios.get(base_url + userID + targettedEndpoint,  { headers: {&quot;Authorization&quot; : `Bearer ${headerAccessToken}`} })
        .catch(error =&gt; { throw error})
    }

and then I am importing this helper function 

    const gmaiLHelper = require(&quot;./../helper/gmail_helper&quot;)

and calling it inside my api route like this

    router.get(&quot;/emailfetch&quot;, authCheck, async (req, res) =&gt; {
      //listing messages in users mailbox 
      let emailFetch = await gmaiLHelper.getEmails(req.user._doc.profile_id , &#39;/messages&#39;, req.user.accessToken)
      .catch(error =&gt; { throw error})
      emailFetch = emailFetch.data
      res.send(emailFetch)
    })

From my end, I think I am handling the error by using catch block. 

**Question:** Can someone explain me why I am getting the error and how can I fix it?

UnhandledPromiseRejectionWarning: This error originated either by throwing inside of an async function without a catch block

One of my work mate&#39;s PRs contains a package-lock.json update, which added `&quot;optional&quot;: true`:

```
 &quot;minimist&quot;: {
   &quot;version&quot;: &quot;0.0.8&quot;,
   &quot;bundled&quot;: true,
-  &quot;dev&quot;: true
+  &quot;dev&quot;: true,
+  &quot;optional&quot;: true
 },
 &quot;minipass&quot;: {
```

I am not sure what this means even after googling around. Could someone please explain?

package-lock.json file, package with &quot;optional&quot;: true

One of my work mate's PRs contains a package-lock.json update, which added <code>"optional": true</code>:
<pre><code class="hljs language-json"> "minimist": {
 "version": "0.0.8",
 "bundled": true,
- "dev": true
+ "dev": true,
+ "optional": true
 },
 "minipass": {
</code></pre>
I am not sure what this means even after googling around. Could someone please explain?

I have a simple code in JavaScript that execute a request in an API and return the response, simple. But in this case I will have thousands of requests. So, which one of the code options will perform better, and why. Also which one is recommended as good pratices these days? 

First options is using the .then to resolve the promises and the seccond one is using async / await.

In my tests the two options had very similar results without significant differences, but I&#39;m not sure in scale.

    // Using then
    doSomething(payload) {
      const url = &#39;https://link-here/consultas&#39;;
      return this.axios.get(url, {
        params: {
          token: payload.token,
          chave: payload.chave,
        },
       }).then(resp =&gt; resp.data);
    }

    // Using Async / await
    async doSomething(payload) {
       const url = &#39;https://link-here/consultas&#39;;
       const resp = await this.axios.get(url, {
       params: {
         token: payload.token,
         chave: payload.chave,
        },
     });
     return resp.data;
    }


Any explanation will be of great value.



Async / await vs then which is the best for performance?

I have the following error in the Chrome Dev Tools console on every page-load of my Node/Express/React application:

&gt; Unchecked runtime.lastError: Could not establish connection. Receiving end does not exist

This error makes a reference to localhost/:1. When I hover over this, it shows http://localhost:3000/, the address I&#39;m viewing the app at in the browser.

Anyone have an idea what is going on? Most of the other threads I&#39;ve found that bring up this error seem to be related to someone trying to develop a Chrome Extension, and even then they tend to have very few responses.



How to fix &#39;Unchecked runtime.lastError: Could not establish connection. Receiving end does not exist.&#39;

I&#39;m using nvm-windows version 1.1.7.

I just installed node 11.9.0.

nvm installs npm version 6.5.0 together with this node version.
However, there&#39;s npm version 6.7.0 available already.

When I now do `npm i -g npm` I get:

    npm ERR! path C:\Program Files\nodejs\npm.cmd
    npm ERR! code EEXIST
    npm ERR! Refusing to delete C:\Program Files\nodejs\npm.cmd: is outside C:\Program Files\nodejs\node_modules\npm and not a link
    npm ERR! File exists: C:\Program Files\nodejs\npm.cmd
    npm ERR! Move it away, and try again.

I found no way to avoid this.



Updating npm when using nvm-windows

I am trying to install angular cli but it&#39;s show me Missing write access to /usr/local/lib/node_modules 
so, how can I fix it in my mac i try it may time but, not getting exact answer  

     npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules
    npm ERR! path /usr/local/lib/node_modules
    npm ERR! code EACCES
    npm ERR! errno -13
    npm ERR! syscall access
    npm ERR! Error: EACCES: permission denied, access &#39;/usr/local/lib/node_modules&#39;
    npm ERR!  { [Error: EACCES: permission denied, access &#39;/usr/local/lib/node_modules&#39;]
    npm ERR!   stack:
    npm ERR!    &#39;Error: EACCES: permission denied, access \&#39;/usr/local/lib/node_modules\&#39;&#39;,
    npm ERR!   errno: -13,
    npm ERR!   code: &#39;EACCES&#39;,
    npm ERR!   syscall: &#39;access&#39;,
    npm ERR!   path: &#39;/usr/local/lib/node_modules&#39; }
    npm ERR! 
    npm ERR! The operation was rejected by your operating system.
    npm ERR! It is likely you do not have the permissions to access this file as the current user
    npm ERR! 
    npm ERR! If you believe this might be a permissions issue, please double-check the
    npm ERR! permissions of the file and its containing directories, or try running
    npm ERR! the command again as root/Administrator (though this is not recommended).




Missing write access in mac to /usr/local/lib/node_modules

What&#39;s the difference between an Interceptor, Filter and Middleware in Nest.js framework? When should one of them be used and favored over the other?

Thanks


What&#39;s the difference between Interceptor vs Middleware vs Filter in Nest.js?

What does `yarn build` command do ? 
Are `yarn build` and `npm build` the same? If not what&#39;s the difference?



What does &quot; yarn build &quot; command do? Are &quot; npm build &quot; and &quot;yarn build&quot; similar commands?

Recently, when I compile my scss files I get an error. The error message says:

&gt; Browserslist: caniuse-lite is outdated. Please run next command `npm update caniuse-lite browserslist`
	
First, as the message says, I ran `npm update caniuse-lite browserslist` but it didn&#39;t fix the issue.
I deleted the whole nod-modules directory and installed again, also I updated the whole folder by `npm update` but none of them solved the issue.
I also reinstalled autoprefixer and browserslist but none of them solved the issue.

If I remove  

    &quot;options&quot;: {
          &quot;autoPrefix&quot;: &quot;&gt; 1%&quot;
        }

from my `compilerconfig.json`, everything works fine which means probably it is related to autoprefixer. Also, I manually changed the package version to the latest version on `package.json` and reinstalled but no luck.


Browserslist: caniuse-lite is outdated. Please run next command `npm update caniuse-lite browserslist`

I&#39;ve got a problem with my build process in relation to my React app.

I always get the following error:

**Module not found: Error: Can&#39;t resolve &#39;core-js/es6&#39;**

if I use this in a polyfill.js:

**import &#39;core-js/es6&#39;;**

That is my package.json:


&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-js --&gt;

    {
      &quot;name&quot;: &quot;test&quot;,
      &quot;version&quot;: &quot;1.0.0&quot;,
      &quot;main&quot;: &quot;index.js&quot;,
      &quot;license&quot;: &quot;MIT&quot;,
      &quot;private&quot;: true,
      &quot;devDependencies&quot;: {
        &quot;@babel/core&quot;: &quot;^7.4.0&quot;,
        &quot;@babel/preset-env&quot;: &quot;^7.4.2&quot;,
        &quot;@babel/preset-react&quot;: &quot;^7.0.0&quot;,
        &quot;@babel/runtime&quot;: &quot;^7.4.2&quot;,
        &quot;babel-loader&quot;: &quot;^8.0.5&quot;,
        &quot;babel-preset-es2015&quot;: &quot;^6.24.1&quot;,
        &quot;copy-webpack-plugin&quot;: &quot;^5.0.2&quot;,
        &quot;css-hot-loader&quot;: &quot;^1.4.4&quot;,
        &quot;eslint&quot;: &quot;5.15.3&quot;,
        &quot;eslint-config-airbnb&quot;: &quot;^17.1.0&quot;,
        &quot;eslint-loader&quot;: &quot;^2.1.2&quot;,
        &quot;eslint-plugin-import&quot;: &quot;2.16.0&quot;,
        &quot;eslint-plugin-jsx-a11y&quot;: &quot;6.2.1&quot;,
        &quot;eslint-plugin-react&quot;: &quot;7.12.4&quot;,
        &quot;file-loader&quot;: &quot;^3.0.1&quot;,
        &quot;node-sass&quot;: &quot;^4.11.0&quot;,
        &quot;prettier&quot;: &quot;^1.16.4&quot;,
        &quot;react-hot-loader&quot;: &quot;4.8.0&quot;,
        &quot;sass-loader&quot;: &quot;^7.1.0&quot;,
        &quot;webpack&quot;: &quot;^4.29.6&quot;,
        &quot;webpack-cli&quot;: &quot;^3.3.0&quot;,
        &quot;webpack-dev-server&quot;: &quot;^3.2.1&quot;
      },
      &quot;dependencies&quot;: {
        &quot;axios&quot;: &quot;^0.18.0&quot;,
        &quot;core-js&quot;: &quot;^3.0.0&quot;,
        &quot;prop-types&quot;: &quot;^15.7.2&quot;,
        &quot;react&quot;: &quot;^16.8.5&quot;,
        &quot;react-dom&quot;: &quot;^16.8.5&quot;,
        &quot;react-redux&quot;: &quot;^6.0.1&quot;,
        &quot;react-string-replace&quot;: &quot;^0.4.1&quot;,
        &quot;redux&quot;: &quot;^4.0.1&quot;,
        &quot;slick-carousel&quot;: &quot;^1.8.1&quot;
      },
      &quot;scripts&quot;: {
        &quot;dev&quot;: &quot;webpack-dev-server --hot&quot;,
        &quot;build&quot;: &quot;webpack --colors --profile --progress --env.mode production&quot;,
        &quot;lint&quot;: &quot;eslint ./src/ --ext .js,.jsx&quot;
      }
    }

&lt;!-- end snippet --&gt;

Can someone help here?

Module not found: Error: Can&#39;t resolve &#39;core-js/es6&#39;

I&#39;m trying to connect to a Azure DevOps Artifacts feed, but I keep getting an E401 error. 

I&#39;ve tried on a different computer and it connected just fine. I&#39;ve uninstalled, and reinstalled my Node.js, and I still got the error. 

Below is the error I get when I run &#39;npm install&#39;

```
npm ERR! code E401
npm ERR! Unable to authenticate, need: Bearer authorization_uri=https://login.windows.net/*********, Basic realm=&quot;https://pkgsprodcus1.pkgs.visualstudio.com/&quot;, TFS-Federated
```

Below is what was added to the .npmrc file 

```
registry=https://[org].pkgs.visualstudio.com/_packaging/[feed].Npm/npm/registry
//pkgs.dev.azure.com/[org]/_packaging/[feed].Npm/npm/registry/:_authToken=[token]
//pkgs.dev.azure.com/[org]/_packaging/[feed].Npm/npm/:_authToken=[token]
```



I expected to be connected to the feed after adding my info to the .npmrc file, and running &#39;npm install&#39;

Content Type	Original Author	Original Content on Stackoverflow
Question	Bill	View Question on Stackoverflow
Solution 1 - node.js	Francesc Rosas	View Answer on Stackoverflow
Solution 2 - node.js	yanychar	View Answer on Stackoverflow
Solution 3 - node.js	R.S	View Answer on Stackoverflow

package-lock.json file, package with "optional": true

node.js Problem Overview

node.js Solutions

Solution 1 - node.js

Solution 2 - node.js

Solution 3 - node.js

UnhandledPromiseRejectionWarning: This error originated either by throwing inside of an async function without a catch block

Change Locale not work after migrate to Androidx

Attributions