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MDK issue : Cannot find module 'tns-core-modules'

I create an extension of MDK with Business Application Studio followed :

in the main-module.ts file , the code is issue:

import { Observable } from 'tns-core-modules/data/observable';

issue : Cannot find module 'tns-core-modules/data/observable'.ts(2307)

I have checked the tsconfig.json file ,it seems OK.

Also,I followed other documents like :

It also has this kind of issue -- the .ts file .

I don't know why,is there something I missed?

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2 Answers

  • Posted on Aug 25 at 06:51 AM

    Hong Wei Ma

    Are you talking about error showing up in .ts files in MDK editor (WebIDE/BAS) ?

    If so, you can ignore it. There is currently no reference of such libraries in the editor hence you see that "cannot find module..." errors. This is handled at runtime in MDK client. These errors should not stop you deploying your metadata project to Mobile Services.

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    • Unfortunally,if l leave the error in .ts files,it will cause error when deploy the

      ModuleNotFoundError:Modulenotfound: Error: Can't resolve './main-model' in '/tmp/vscode-unpacked/vscode_npm_@ext-mdkvsc-npm-rel_mdkvsc-wing@1.2.23/extension/tools/application-bundler/build.definitions/NS_CustomerSales/Extensions/SalesChartModule/controls',ModuleNotFoundError: Module not found: Error: Can't resolve 'nativescript-ui-chart'in'/tmp/vscode-unpacked/vscode_npm_@ext-mdkvsc-npm-rel_mdkvsc-wing@1.2.23/extension/tools/application-bundler/build.definitions/NS_CustomerSales/Extensions/SalesChartModule/controls'
  • Posted on Aug 26 at 08:22 PM

    Hong Wei Ma

    You will need to make sure you update your externals reference in BAS to include nativescript-ui-chart so it can deploy to mobile services.

    1. Select File > Settings > Open Preferences
    2. Search for MDK and click the Edit in settings.json link under Bundler Externals to open settings.json in the editor.
    3. Set your mdk.bundlerExternals as shown below
    4. Save your changes
    5. Rerun the MDK: Deploy again
        "": "-DwatchParentProcess=false -noverify -Xmx512m -XX:+UseG1GC -XX:+UseStringDeduplication", 
        "java.configuration.checkProjectSettingsExclusions": false, 
        "java.configuration.updateBuildConfiguration": "automatic", 
        "java.autobuild.enabled": false,
        "files.exclude": { 
            "**/.classpath": true,
            "**/.project": true,
            "**/.settings": true,
            "**/.factorypath": true,
            "**/.extension": true 
        "ports.excludeExposeNotification": { 
            "ports": [ 8000, 8005, 8009 ],
            "ranges": [ { 
                "from": 0,
                "to": 0 
            } ] 
        "": false,
        "workbench.iconTheme": "theia-file-icons",
        "workbench.list.openMode": "singleClick",
        "workspace.preserveWindow": false,
        "mdk.validateBeforeBundle": false,
        "mdk.bundlerExternals": [
        "mck.mobileservices": [] 


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