Hello, I was trying to upgrade my Cocos Creator 2.4.2 game project to Cocos Creator 3.x
Upgrading code was succesful except rxjs module…
but having issue on importing rxjs module. Spent 2 weeks on solving this issue … 
please help me fixing this…
or Cocos Creator 3.x + rxjs example project will be helpful for me .
I ‘ve searched and tried all of forum posts’ methods, but nethier worked:
[Scene] Error: Error: Invalid module specifier
at rejector (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:759:15)
at ExecutorSystem.resolve [as _detailResolve] (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:777:13)
at ExecutorSystem._resolve (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\src\editor-systemjs\index.ts:120:14)
at SystemJS.resolve (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\src\editor-systemjs\index.ts:36:23)
at C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:355:37
at Array.map (<anonymous>)
at C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:353:41
at file:///C:/Users/zi_zi/Downloads/132213/temp/programming/packer-driver/targets/editor/chunks/5f/cce:/internal/x/prerequisite-imports:8:13
at Object.execute (file:///C:/Users/zi_zi/Downloads/132213/temp/programming/packer-driver/targets/editor/chunks/5f/cce:/internal/x/prerequisite-imports:4:1)
at Executor._importPrerequisiteModules (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\src\executor\index.ts:263:13)
Error: [Scene] Error: Error: Invalid module specifier
at SystemJS.resolve (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\src\editor-systemjs\index.ts:36:23)
at C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:355:37
at Array.map (<anonymous>)
at C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:353:41
at file:///C:/Users/zi_zi/Downloads/132213/temp/programming/packer-driver/targets/editor/chunks/5f/cce:/internal/x/prerequisite-imports:8:13
at Object.execute (file:///C:/Users/zi_zi/Downloads/132213/temp/programming/packer-driver/targets/editor/chunks/5f/cce:/internal/x/prerequisite-imports:4:1)
at Executor._importPrerequisiteModules (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\src\executor\index.ts:263:13)
at Logger._logHandler (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\builtin\scene\dist\script\3d\manager\startup\log.ccc:1:318)
at Logger.record (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@base\electron-logger\lib\renderer.ccc:1:458)
at console.error (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@base\electron-logger\lib\renderer.ccc:1:1414)
at ScriptManager._handleImportException (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\builtin\scene\dist\script\3d\manager\scripts.ccc:1:5375)
at Executor.importExceptionHandler [as _importExceptionHandler] (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\builtin\scene\dist\script\3d\manager\scripts.ccc:1:3367)
at Executor._onModuleLoaded (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\src\executor\index.ts:312:22)
at SystemJS.onload (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\src\executor\index.ts:73:18)
at triggerOnload (C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:270:10)
at C:\ProgramData\cocos\editors\Creator\3.6.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:431:7
at file:///C:/Users/zi_zi/Downloads/132213/temp/programming/packer-driver/targets/editor/chunks/5f/cce:/internal/x/prerequisite-imports:8:13