As of `npm@5`, the npm cache self-heals from corruption issues and data extracted from the cache is guaranteed to be valid. If you want to make sure everything is consistent, use `npm cache verify` instead. On the other hand, if you&#39;re debugging an issue with the installer, you can use `npm install --cache /tmp/empty-cache` to use a temporary cache instead of nuking the actual one.

If you&#39;re sure you want to delete the entire cache, rerun:

    npm cache clean --force

A complete log of this run can be found in `/Users/USERNAME/.npm/_logs/2019-01-08T21_29_30_811Z-debug.log`.

This error can be due to many many things.

The key here seems the hint about `error reading`. I see you are working on a flash drive or something similar? Try to run the install on a local folder owned by your current user.

You could also try with `sudo`, that might solve a permission problem if that&#39;s the case.

Another reason why it cannot read could be because it has not downloaded correctly, or saved correctly. A little problem in your network could have caused that, and the cache clean would remove the files and force a refetch but that does not solve your problem. That means it would be more on the save part, maybe it didn&#39;t save because of permissions, maybe it didn&#39;t not save correctly because it was lacking disk space...

npm cache clean doesn&#39;t work now 

Type below command :- 

1- npm cache verify

Read the error in terminal it will show you exact commands to run for solution.
you might need to append --force

2- sudo chown -R 501:20 &quot;/$path$/.npm&quot;. (this works for me )

How can I make a **Material UI** react `Button` component act as a `Link` component from **react-router-dom** without losing it&#39;s original style? Like changing the route on click.

    import Button from &#39;@material-ui/core/Button&#39;;
    
    &lt;Button variant=&quot;contained&quot; color=&quot;primary&quot;&gt;
        About Page
    &lt;/Button&gt;

To something like this, but maintaining the original `Button` style:

    import Button from &#39;@material-ui/core/Button&#39;;
    import { Link } from &#39;react-router-dom&#39;;
        
    &lt;Button variant=&quot;contained&quot; color=&quot;primary&quot;&gt;
        &lt;Link to=&quot;/about&quot;&gt;
            About Page
        &lt;/Link&gt;
    &lt;/Button&gt;

How to make a Material UI react Button act as a react-router-dom Link?

How to decode JSON in Flutter?

The question is simple, but the answer isn&#39;t, at least for me.

I have a project that uses a lot of JSON Strings. Basically, the entire communication between the app and the server is through JSON.

I have been using `JSON.decode(json_string)` to deal with it, but today I updated the Flutter core (0.5.8-pre.178) and JSON.decode isn&#39;t available anymore.

I went to the [Flutter Docs][1] to seek help, but it still says to use JSON.decode.

So, how to decode JSON in Flutter from now on?


  [1]: https://flutter.io/json/

How to decode JSON in Flutter?

I&#39;m trying to install IPFS from [here](https://github.com/ipfs/js-ipfs#install)``` npm install ipfs --save ```  and it is giving me the error as  

&gt; npm ERR! tar.unpack error reading /media/FLASH/Tech/IPFS/ipfs
&gt;
&gt; npm ERR! addLocal Could not install /media/FLASH/Tech/IPFS/ipfs
&gt;
&gt; npm ERR! Linux 4.15.0-29-generic
&gt;
&gt; npm ERR! argv &quot;/usr/local/bin/node&quot; &quot;/usr/local/bin/npm&quot; &quot;install&quot; &quot;ipfs&quot;
&quot;--save&quot;
&gt;
&gt; npm ERR! node v6.9.2
&gt;
&gt; npm ERR! npm  v3.10.9
&gt; 
&gt; npm ERR! 0-byte tarball
&gt;
&gt; npm ERR! Please run npm cache clean

I tried doing ``` npm cache clean``` but still it is giving me the same error while doing ``` npm install ipfs --save ``` 

I don&#39;t know why I&#39;m getting this error. and how to avoid this error.  

Please run `npm cache clean`

I'm trying to install IPFS from <a href="https://github.com/ipfs/js-ipfs#install" target="_blank" rel="noopener noreferrer">here</a><code>npm install ipfs --save</code> and it is giving me the error as
> npm ERR! tar.unpack error reading /media/FLASH/Tech/IPFS/ipfs
>
> npm ERR! addLocal Could not install /media/FLASH/Tech/IPFS/ipfs
>
> npm ERR! Linux 4.15.0-29-generic
>
> npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "ipfs"
"--save"
>
> npm ERR! node v6.9.2
>
> npm ERR! npm v3.10.9
>
> npm ERR! 0-byte tarball
>
> npm ERR! Please run npm cache clean
I tried doing <code> npm cache clean</code> but still it is giving me the same error while doing <code>npm install ipfs --save</code>
I don't know why I'm getting this error. and how to avoid this error.

I&#39;m using tsc build tasks. Unfortunately I&#39;m always getting the same errors from the node modules folder

    Executing task: .\node_modules\.bin\tsc.cmd --watch -p .\tsconfig.json &lt;
    node_modules/@types/node/index.d.ts(6208,55): error TS2304: Cannot find name &#39;Map&#39;.
    node_modules/@types/node/index.d.ts(6215,55): error TS2304: Cannot find name &#39;Set&#39;.
    node_modules/@types/node/index.d.ts(6219,64): error TS2304: Cannot find name &#39;Symbol&#39;.
    node_modules/@types/node/index.d.ts(6225,59): error TS2304: Cannot find name &#39;WeakMap&#39;.
    node_modules/@types/node/index.d.ts(6226,59): error TS2304: Cannot find name &#39;WeakSet&#39;.
    10:13:18 - Compilation complete. Watching for file changes.

I already added the directory to the ignore at `tsconfig.json`
```json

    {
      &quot;compilerOptions&quot;: {
        &quot;target&quot;: &quot;es5&quot;,
        &quot;module&quot;: &quot;commonjs&quot;,
        &quot;sourceMap&quot;: true,
        &quot;strict&quot;: false,
        &quot;noImplicitAny&quot;: false,
        &quot;strictPropertyInitialization&quot;: false,
        &quot;esModuleInterop&quot;: true,
      },
      &quot;include&quot;: [
        &quot;src/*&quot;
      ],
      &quot;exclude&quot;: [
        &quot;node_modules&quot;,
        &quot;./node_modules&quot;,
        &quot;./node_modules/*&quot;,
        &quot;./node_modules/@types/node/index.d.ts&quot;,
      ]
    }
```
What I&#39;m doing wrong? What should I do in order to ignore those errors?

I&#39;m using VsCode and tsc Version 2.9.2

How to force tsc to ignore node_modules folder?

&gt; npm start

starts the react server on the default browser, which is Firefox for me. I like Firefox for browsing but prefer Chrome in web development for its developer tools. Is there a way to force &quot;npm start&quot; to start the server with Chrome, without changing my default browser to chrome? I am using Bash on Windows.

**Edit:** I used &quot;create-react-app&quot; to create my server and this adds a [script to &quot;packages.json&quot; file for &quot;npm start&quot;](https://i.imgur.com/j8DLTWU.png). The script starts the localhost server with the default browser. How do I modify the script added by &quot;create-react-app&quot; such that it starts with a different browser?

create-react-app: How do I &quot;npm start&quot; with a specific browser?

Tried to run this command on ubuntu 18.04

    npm install -g pngquant-bin

but I got this error, 

    [..................] | fetchMetadata: sill resolveWithNewModule npm-conf@1.1.3 checking installable status
    npm WARN deprecated gulp-util@3.0.8: gulp-util is deprecated - replace it, following the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
    /root/.nvm/versions/node/v10.8.0/bin/pngquant -&gt; /root/.nvm/versions/node/v10.8.0/lib/node_modules/pngquant-bin/cli.js
    
    &gt; pngquant-bin@5.0.0 postinstall /root/.nvm/versions/node/v10.8.0/lib/node_modules/pngquant-bin
    &gt; node lib/install.js
    
    sh: 1: node: Permission denied
    npm ERR! file sh
    npm ERR! code ELIFECYCLE
    npm ERR! errno ENOENT
    npm ERR! syscall spawn
    npm ERR! pngquant-bin@5.0.0 postinstall: `node lib/install.js`
    npm ERR! spawn ENOENT
    npm ERR!
    npm ERR! Failed at the pngquant-bin@5.0.0 postinstall script.
    npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
    
    npm ERR! A complete log of this run can be found in:
    npm ERR!     /root/.npm/_logs/2018-08-12T18_08_02_197Z-debug.log

Do you do you know how to deal with this?
I tried every solution found in this [articles][1] yet not succeeded.

  [1]: https://github.com/imagemin/pngquant-bin/issues/78

sh: 1: node: Permission denied

I&#39;ve got a `PlayersModule` and an `ItemsModule`.

I want to use the `ItemsService` in the `PlayersService`.

When I add it by injection:

    import { Injectable } from &#39;@nestjs/common&#39;;
    import { InjectModel } from &#39;nestjs-typegoose&#39;;
    import { ModelType, Ref } from &#39;typegoose&#39;;
    import { Player } from &#39;./player.model&#39;;
    import { Item } from &#39;../items/item.model&#39;;
    import { ItemsService } from &#39;../items/items.service&#39;;
    
    @Injectable()
    export class PlayersService {
        constructor(
            @InjectModel(Player) private readonly playerModel: ModelType&lt;Player&gt;,
            private readonly itemsService: ItemsService){}

I get this nest error :

&gt; [Nest] 11592   - 2018-8-13 11:42:17   [ExceptionHandler] Nest can&#39;t
&gt; resolve dependencies of the PlayersService (+, ?). Please make sure
&gt; that the argument at index [1] is available in the current context.

Both modules are imported in the `app.module.ts`. Both services are working alone in their module.

Inject nestjs service from another module

I have a class written in Javascript ES6. When I try to execute `nodemon` command I always see this error `TypeError: Class constructor Client cannot be invoked without &#39;new&#39;`

The full error is mentioned below:

    /Users/akshaysood/Blockchain/fabricSDK/dist/application/Transaction.js:45
            return (0, _possibleConstructorReturn3.default)(this, (FBClient.__proto__ || (0, _getPrototypeOf2.default)(FBClient)).call(this, props));
                                                                                                                                  ^
    
    TypeError: Class constructor Client cannot be invoked without &#39;new&#39;
        at new FBClient (/Users/akshaysood/Blockchain/fabricSDK/dist/application/Transaction.js:45:127)
        at Object.&lt;anonymous&gt; (/Users/akshaysood/Blockchain/fabricSDK/dist/application/Transaction.js:195:14)
        at Module._compile (module.js:641:30)
        at Object.Module._extensions..js (module.js:652:10)
        at Module.load (module.js:560:32)
        at tryModuleLoad (module.js:503:12)
        at Function.Module._load (module.js:495:3)
        at Module.require (module.js:585:17)
        at require (internal/module.js:11:18)
        at Object.&lt;anonymous&gt; (/Users/akshaysood/Blockchain/fabricSDK/dist/routes/users.js:11:20)

What I am trying to do is, I have created a class and then created an instance of that class. Then I am trying to export that variable.

The class structure is defined below:

    class FBClient extends FabricClient{
    
        constructor(props){
            super(props);
        }
    
    &lt;&lt;&lt; FUNCTIONS &gt;&gt;&gt;
    
    }

How I am trying to export the variable -&gt;

    var client = new FBClient();
    client.loadFromConfig(config);
    
    export default client = client;


You can find the full code here &gt; https://hastebin.com/kecacenita.js
Code generated by Babel &gt; https://hastebin.com/fabewecumo.js

Javascript ES6 TypeError: Class constructor Client cannot be invoked without &#39;new&#39;

need pinned resolution feature of yarn, but also want to audit with `npm audit`? Is there a yarn alternative to `npm audit`? Or, alternately, will pinning resolutions of dependencies of dependencies work in `npm`?

is there a yarn alternative for npm audit?

I am trying to build a react app, but when I execute the command `npm -i` it gives me the following error:

    Error: Failed to replace env in config: ${NPM_TOKEN}
        at /usr/local/lib/node_modules/npm/lib/config/core.js:415:13
        at String.replace (&lt;anonymous&gt;)
        at envReplace (/usr/local/lib/node_modules/npm/lib/config/core.js:411:12)
        at parseField (/usr/local/lib/node_modules/npm/lib/config/core.js:389:7)
        at /usr/local/lib/node_modules/npm/lib/config/core.js:330:24
        at Array.forEach (&lt;anonymous&gt;)
        at Conf.add (/usr/local/lib/node_modules/npm/lib/config/core.js:328:23)
        at ConfigChain.addString (/usr/local/lib/node_modules/npm/node_modules/config-chain/index.js:244:8)
        at Conf.&lt;anonymous&gt; (/usr/local/lib/node_modules/npm/lib/config/core.js:316:10)
        at /usr/local/lib/node_modules/npm/node_modules/graceful-fs/graceful-fs.js:78:16
    /usr/local/lib/node_modules/npm/lib/npm.js:61
          throw new Error(&#39;npm.load() required&#39;)
          ^
    
    Error: npm.load() required
        at Object.get (/usr/local/lib/node_modules/npm/lib/npm.js:61:13)
        at process.errorHandler (/usr/local/lib/node_modules/npm/lib/utils/error-handler.js:205:18)
        at process.emit (events.js:182:13)
        at process._fatalException (internal/bootstrap/node.js:448:27)

I am using MacOS High Sierra. I tried to set the NPM_TOKEN as an environment variable with following command:

    set -x NPM_TOKEN = xyz
but it doesn&#39;t work.
What is the problem?

NPM - Failed to replace env in config: ${NPM_TOKEN}

I am following along with this webpack4/react tutorial:

https://www.youtube.com/watch?v=deyxI-6C2u4

I have followed it exactly up until the part where he runs npm start. The difference is, his app runs, and mine gets the error:

Cannot find module &#39;@babel/core&#39;

The full error:

    ERROR in ./src/index.js
    Module build failed (from ./node_modules/babel-loader/lib/index.js):
    Error: Cannot find module &#39;@babel/core&#39;
        at Function.Module._resolveFilename (module.js:547:15)
        at Function.Module._load (module.js:474:25)
        at Module.require (module.js:596:17)
        at require (internal/module.js:11:18)
        at Object.&lt;anonymous&gt; (C:\Users\joeyf\Desktop\Code\Github\webpack4-sample\node_modules\babel-loader\lib\index.js:5:15)
        at Module._compile (module.js:652:30)
        at Object.Module._extensions..js (module.js:663:10)
        at Module.load (module.js:565:32)
        at tryModuleLoad (module.js:505:12)
        at Function.Module._load (module.js:497:3)
     @ multi (webpack)-dev-server/client?http://localhost:8080 (webpack)/hot/dev-server.js ./src/index.js main[2]

I have tried to reinstall babel-core but is still not being found. Here is my package.json:

    {
      &quot;name&quot;: &quot;webpack4-sample&quot;,
      &quot;version&quot;: &quot;1.0.0&quot;,
      &quot;description&quot;: &quot;A sample setup of Webpack4 with React and Babel&quot;,
      &quot;main&quot;: &quot;index.js&quot;,
      &quot;scripts&quot;: {
        &quot;start&quot;: &quot;webpack-dev-server --mode development --open --hot&quot;,
        &quot;build&quot;: &quot;webpack --mode production&quot;
      },
      &quot;author&quot;: &quot;Joey Fenny&quot;,
      &quot;license&quot;: &quot;ISC&quot;,
      &quot;dependencies&quot;: {
        &quot;babel&quot;: &quot;^6.23.0&quot;,
        &quot;babel-cli&quot;: &quot;^6.26.0&quot;,
        &quot;react&quot;: &quot;^16.4.2&quot;,
        &quot;react-dom&quot;: &quot;^16.4.2&quot;
      },
      &quot;devDependencies&quot;: {
        &quot;babel-core&quot;: &quot;^7.0.0-rc.4&quot;,
        &quot;babel-loader&quot;: &quot;^8.0.0&quot;,
        &quot;babel-preset-env&quot;: &quot;^1.7.0&quot;,
        &quot;babel-preset-react&quot;: &quot;^6.24.1&quot;,
        &quot;html-webpack-plugin&quot;: &quot;^3.2.0&quot;,
        &quot;webpack&quot;: &quot;^4.17.1&quot;,
        &quot;webpack-cli&quot;: &quot;^3.1.0&quot;,
        &quot;webpack-dev-server&quot;: &quot;^3.1.6&quot;
      }
    }

My webpack.config.js:

    const path = require(&#39;path&#39;);
    const HtmlWebpackPlugin = require(&#39;html-webpack-plugin&#39;);
    
    module.exports = {
        entry: &#39;./src/index.js&#39;,
        output: {
            path: path.join(__dirname, &#39;/dist&#39;),
            filename: &#39;index_bundle.js&#39;
        },
        module: {
            rules: [{
                test: /\.js$/,
                exclude: path.join(__dirname, &#39;/node_modules&#39;),
                use: {
                    loader: &#39;babel-loader&#39;
                }
            }]
        },
        plugins: [
            new HtmlWebpackPlugin({
                template: &#39;./src/index.html&#39;
            })
        ]
    }

Here is a link to a git repo:

https://gitlab.com/jfny/webpack4-sample

Anyone know whats going on? Thanks.


Content Type	Original Author	Original Content on Stackoverflow
Question	FLASH	View Question on Stackoverflow
Solution 1 - node.js	infin80	View Answer on Stackoverflow
Solution 2 - node.js	Salketer	View Answer on Stackoverflow
Solution 3 - node.js	user2830254	View Answer on Stackoverflow

Please run `npm cache clean`

node.js Problem Overview

node.js Solutions

Solution 1 - node.js

Solution 2 - node.js

Solution 3 - node.js

How to decode JSON in Flutter?

How to make a Material UI react Button act as a react-router-dom Link?

Attributions