Using "npm run build" fails with "npm ERR! missing script: build"

Question

How can i fix this error, I'm running Windows 10

When i try to npm run build on the cmd i get this error

C:\Users\anai_> npm run build npm ERR! missing script: build 

Here is the log of the run

0 info it worked if it ends with ok 1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe', 1 verbose cli   'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js', 1 verbose cli   'run', 1 verbose cli   'build' ] 2 info using [email protected] 3 info using [email protected] 4 verbose config Skipping project config: C:\Users\anai_/.npmrc. (matches userconfig) 5 verbose stack Error: missing script: build 5 verbose stack     at run (C:\Program Files\nodejs\node_modules\npm\lib\run-script.js:151:19) 5 verbose stack     at C:\Program Files\nodejs\node_modules\npm\lib\run-script.js:61:5 5 verbose stack     at C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:115:5 5 verbose stack     at C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:402:5 5 verbose stack     at checkBinReferences_ (C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:357:45) 5 verbose stack     at final (C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:400:3) 5 verbose stack     at then (C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:160:5) 5 verbose stack     at ReadFileContext.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:332:20) 5 verbose stack     at ReadFileContext.callback (C:\Program Files\nodejs\node_modules\npm\node_modules\graceful-fs\graceful-fs.js:78:16) 5 verbose stack     at FSReqWrap.readFileAfterOpen [as oncomplete] (fs.js:437:13) 6 verbose cwd C:\Users\anai_ 7 verbose Windows_NT 10.0.15063 8 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "run" "build" 9 verbose node v9.1.0 10 verbose npm  v5.5.1 11 error missing script: build 12 verbose exit [ 1, true ] 

Although the error refers to a missing script build, i have placed a 'build' script in my package.json

{   "name": "es6",   "version": "1.0.0",   "main": "index.js",   "scripts": {     "build": "webpack"   },   "keywords": [],   "author": "",   "license": "ISC",   "devDependencies": {     "webpack": "^3.8.1"   }  } 

and this is my webpack.config.js file

module.exports = {   entry: ['./app/index.js'],   output: {     path: './build',     filename: 'bundle.js'    } } 

Can anyone tell me how to fix this error or where it is coming from. I am new to using node.js, webpack and the command line. Thanks in advance for your time!

Answer 1

1. Try setting the output.path in webpack.config.js to an absolute path

   module.exports = {     entry: ['./app/index.js'],     output: {         path: __dirname + '/build',         filename: 'bundle.js'     } } 

   I don't have Windows (on Linux) but with node 8.16.0 and npm 6.4.1, replicating your package.json and webpack.config.js, I got the following error:

   Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.  - configuration.output.path: The provided value "./build" is not an absolute path!     -> The output directory as **absolute path** (required). 

   See more on the absolute-path stuff here

2. Since you are on Windows, check your file line-endings (CRLF vs LF). If you've cloned code from another place, depending on your git config, it might have carried over different line endings. You can quickly check line endings in the lower-right corner of VSCode.

Steps I did to mimic your setup:

1. copied your package.json and webpack.config.js
2. run npm i (or npm install)
3. run npm run build - received the invalid configuration error noted above
4. changed the output.path to an absolute path concatenating with __dirname (not sure if Windows is different...)
5. reran npm run build and got:

   ERROR in multi ./app/index.js Module not found: Error: Can't resolve './app/index.js' in '/tmp/es6' @ multi ./app/index.js 

6. ran mkdir app && touch app/index.js (in linux, creates folder 'app' and then creates the index.js file inside the app folder)

7. reran npm run build and success:

   > [email protected] build /tmp/es6 > webpack  Hash: 0578ec98b09c215702c6 Version: webpack 3.12.0 Time: 34ms     Asset     Size  Chunks             Chunk Names bundle.js  2.59 kB       0  [emitted]  main [0] multi ./app/index.js 28 bytes {0} [built] [1] ./app/index.js 0 bytes {0} [built]