Missing script: "build" after migration

[aldik1971]

Hello, I tried migrate from Cordova to Capacitor using this instructions on web page URL
https://capacitorjs.com/cordova

After migrations I tried to run command

npm run build

but I got this error

npm ERR! Missing script: "build"
npm ERR!
npm ERR! To see a list of scripts, run:
npm ERR! npm run
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\aldik\AppData\Local\npm-cache_logs\2022-12-12T11_13_29_759Z-debug-0.log (Log file is an attachment)

My package.json includes this section

"scripts": {
"test": "echo "Error: no test specified" && exit 1"
},

Can anybody help me fix this issue - missing build scripts? I have tried multiple tutorials on the internet but without success.
(for example add to this section "ionic:build": "ionic-app-scripts build",
"ionic:serve": "ionic-app-scripts serve" )

Regards

Aldik

log.txt

[jcesarmobile]

This is what the link says

Most web app's

npm run build

Ionic app

ionic build

It means that most apps have a build script for building the app
If you don’t have a custom build script and you are using ionic, then run ionic build instead.

[aldik1971]

Hello, first, I'd like to apologize for the late response.

I ran "ionic build" and I got this message - [ERROR] Sorry! ionic build can only be run in an Ionic project directory.
As a next step I did "ionic init", fild app name and chose as a project type - custom.

After that, I added to my package.json this code to scripts section:

"test": "echo "Error: no test specified" && exit 1",
"ionic:build": "ionic-app-scripts build",
"ionic:serve": "ionic-app-scripts serve",
"serve": "vue-cli-service serve",
"build": "vue-cli-service build",
"lint": "vue-cli-service lint"

As my next step I ran "npx cap sync" and "ionic build --verbose"

I got this message:

'ionic-app-scripts' is not recognized as an internal or external command,
operable program or batch file.
[ERROR] An error occurred while running subprocess npm.

    npm.cmd run ionic:build exited with exit code 1.

    Re-running this command with the --verbose flag may provide more information.

ionic:utils-process onBeforeExit handler: 'process.exit' received +0ms
ionic:utils-process onBeforeExit handler: running 1 functions +1ms
ionic:utils-process error while killing process tree for 12452: Error: Command failed: taskkill /pid 12452 /T /F
ionic:utils-process ERROR: The process "12452" not found.
ionic:utils-process
ionic:utils-process at ChildProcess.exithandler (node:child_process:412:12)
ionic:utils-process at ChildProcess.emit (node:events:513:28)
ionic:utils-process at maybeClose (node:internal/child_process:1091:16)
ionic:utils-process at Socket. (node:internal/child_process:449:11)
ionic:utils-process at Socket.emit (node:events:513:28)
ionic:utils-process at Pipe. (node:net:313:12) {
ionic:utils-process code: 128,
ionic:utils-process killed: false,
ionic:utils-process signal: null,
ionic:utils-process cmd: 'taskkill /pid 12452 /T /F'
ionic:utils-process } +209ms
ionic:utils-process onBeforeExit handler: error from function: Error: Command failed: taskkill /pid 12452 /T /F
ionic:utils-process ERROR: The process "12452" not found.
ionic:utils-process
ionic:utils-process at ChildProcess.exithandler (node:child_process:412:12)
ionic:utils-process at ChildProcess.emit (node:events:513:28)
ionic:utils-process at maybeClose (node:internal/child_process:1091:16)
ionic:utils-process at Socket. (node:internal/child_process:449:11)
ionic:utils-process at Socket.emit (node:events:513:28)
ionic:utils-process at Pipe. (node:net:313:12) {
ionic:utils-process code: 128,
ionic:utils-process killed: false,
ionic:utils-process signal: null,
ionic:utils-process cmd: 'taskkill /pid 12452 /T /F'
ionic:utils-process } +2ms
ionic:utils-process processExit: exiting (exit code: 1) +2ms

After this message I tried install " npm install @ionic/app-scripts@latest --save-dev" , but I got this message

npm ERR! gyp info using [email protected]
npm ERR! gyp info using [email protected] | win32 | x64
npm ERR! gyp verb command rebuild []
npm ERR! gyp verb command clean []
npm ERR! gyp verb clean removing "build" directory
npm ERR! gyp verb command configure []
npm ERR! gyp verb check python checking for Python executable "python2" in the PATH
npm ERR! gyp verb which failed Error: not found: python2
npm ERR! gyp verb which failed at getNotFoundError (C:\MyProject\node_modules\node-gyp\node_modules\which\which.js:13:12)
npm ERR! gyp verb which failed at F (C:\MyProject\node_modules\node-gyp\node_modules\which\which.js:68:19)
npm ERR! gyp verb which failed at E (C:\MyProject\node_modules\node-gyp\node_modules\which\which.js:80:29)
npm ERR! gyp verb which failed at C:\MyProject\node_modules\node-gyp\node_modules\which\which.js:89:16
npm ERR! gyp verb which failed at C:\MyProject\node_modules\isexe\index.js:42:5
npm ERR! gyp verb which failed at C:\MyProject\node_modules\isexe\windows.js:36:5
npm ERR! gyp verb which failed at FSReqCallback.oncomplete (node:fs:207:21)
npm ERR! gyp verb which failed python2 Error: not found: python2
npm ERR! gyp verb which failed at getNotFoundError (C:\MyProject\node_modules\node-gyp\node_modules\which\which.js:13:12)
npm ERR! gyp verb which failed at F (C:\MyProject\node_modules\node-gyp\node_modules\which\which.js:68:19)
npm ERR! gyp verb which failed at E (C:\MyProject\node_modules\node-gyp\node_modules\which\which.js:80:29)
npm ERR! gyp verb which failed at C:\MyProject\node_modules\node-gyp\node_modules\which\which.js:89:16
npm ERR! gyp verb which failed at C:\MyProject\node_modules\isexe\index.js:42:5
npm ERR! gyp verb which failed at C:\MyProject\node_modules\isexe\windows.js:36:5
npm ERR! gyp verb which failed at FSReqCallback.oncomplete (node:fs:207:21) {
npm ERR! gyp verb which failed code: 'ENOENT'
npm ERR! gyp verb which failed }
npm ERR! gyp verb check python checking for Python executable "python" in the PATH
npm ERR! gyp verb which succeeded python C:\Python311\python.EXE
npm ERR! gyp ERR! configure error
npm ERR! gyp ERR! stack Error: Command failed: C:\Python311\python.EXE -c import sys; print "%s.%s.%s" % sys.version_info[:3];
npm ERR! gyp ERR! stack File "", line 1
npm ERR! gyp ERR! stack import sys; print "%s.%s.%s" % sys.version_info[:3];
npm ERR! gyp ERR! stack ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
npm ERR! gyp ERR! stack SyntaxError: Missing parentheses in call to 'print'. Did you mean print(...)?
npm ERR! gyp ERR! stack
npm ERR! gyp ERR! stack at ChildProcess.exithandler (node:child_process:412:12)
npm ERR! gyp ERR! stack at ChildProcess.emit (node:events:513:28)
npm ERR! gyp ERR! stack at maybeClose (node:internal/child_process:1091:16)
npm ERR! gyp ERR! stack at Socket. (node:internal/child_process:449:11)
npm ERR! gyp ERR! stack at Socket.emit (node:events:513:28)
npm ERR! gyp ERR! stack at Pipe. (node:net:313:12)
npm ERR! gyp ERR! System Windows_NT 10.0.19045
npm ERR! gyp ERR! command "C:\Program Files\nodejs\node.exe" "C:\MyProject\node_modules\node-gyp\bin\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
npm ERR! gyp ERR! cwd C:\MyProject\node_modules\node-sass
npm ERR! gyp ERR! node -v v18.12.1
npm ERR! gyp ERR! node-gyp -v v3.8.0
npm ERR! gyp ERR! not ok
npm ERR! Build failed with error code: 1

Python is in .npmrc config file written as
python "C:\Python27\python.exe"=true

and it is in system PATH too.

Thanks for your help me.

[jcesarmobile]

Sorry, I thought your app was an Ionic app. If it’s not an Ionic app then you don’t have to run ionic build.
How does your app folder structure looks like?

[aldik1971]

It is an Apache Cordova android application. Main folder has this structure

.vs
.vscode
-node_modules
-platforms
-plugins
-www
.gitignore
.hintrc
.prettierrc
.project
conf.json
config.xml
jsconfig.json
package-lock.json
package.json

WWW folder includes

-components
-css
-images
-js
-js_main
-lib
-resource
-ts
.brackets.json
.prettierignore
Gruntfile.js
index.html
init-statements.sql
tsconfig.json
tslint.json

After migration main folder structure includes

.vs
.vscode
-android
-node_modules
-www
.gitattributes
.gitignore
.hintrc
.npmrc
.prettierrc
.project
capacitor.config.json
conf.json
ionic.config.json
jsconfig.json
package-lock.json
package.json

Thanks

[jcesarmobile]

Then if you already have a www folder that is not built, you don't need the build script.
But it's harder to use Capacitor if you are not using any javascript bundler as you can't use plugins as the documented usage.