tried this solution on cocosCreator 3.7.3 Car sample project, but. 
got this error
or
[Scene] Error: Error: Unexpected export statement in CJS module.
at @:1:8
at Object.execute (file:///F:/game/NewProject_2/temp/programming/packer-driver/targets/editor/chunks/db/db871e03bd39729f90582e139037492f481606ff.js:8:13)
at doExec (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:517:30)
at postOrderExec (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:508:21)
at C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:493:28
at Array.forEach (<anonymous>)
at postOrderExec (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:491:10)
at C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:493:28
at Array.forEach (<anonymous>)
at postOrderExec (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:491:10)
at C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:440:12
Error: [Scene] Error: Error: Unexpected export statement in CJS module.
at postOrderExec (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:508:21)
at C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:493:28
at Array.forEach (<anonymous>)
at postOrderExec (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:491:10)
at C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:493:28
at Array.forEach (<anonymous>)
at postOrderExec (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:491:10)
at C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:440:12
at Logger._logHandler (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\builtin\scene\dist\script\3d\manager\startup\log.ccc:1:318)
at Logger.record (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@base\electron-logger\lib\renderer.ccc:1:458)
at console.error (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@base\electron-logger\lib\renderer.ccc:1:1414)
at ScriptManager._handleImportException (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\builtin\scene\dist\script\3d\manager\scripts.ccc:1:5259)
at Executor.importExceptionHandler [as _importExceptionHandler] (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\builtin\scene\dist\script\3d\manager\scripts.ccc:1:3396)
at Executor._onModuleLoaded (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\src\executor\index.ts:316:22)
at SystemJS.onload (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\src\executor\index.ts:77:18)
at triggerOnload (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:270:10)
at doExec (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:538:7)
at postOrderExec (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\node_modules\@editor\lib-programming\static\executor\systemjs-bridge\out\index.js:508:21)
[Scene] Missing class: c5aa7IsWr5A4blPeFPanXM/
Error: [Scene] Missing class: c5aa7IsWr5A4blPeFPanXM/
at Object.classFinder (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\app.asar\builtin\engine\dist\editor-extends\missing-reporter\missing-class-reporter.ccc:1:2131)
at _Deserializer.classFinder [as _classFinder] (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\resources\3d\engine\bin\.cache\dev\editor\bundled\index.js:136986:34)
at _Deserializer._deserializeTypeTaggedObject (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\resources\3d\engine\bin\.cache\dev\editor\bundled\index.js:46692:30)
at _Deserializer._deserializeObject (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\resources\3d\engine\bin\.cache\dev\editor\bundled\index.js:46633:29)
at _Deserializer._deserializeAndAssignField (C:\ProgramData\cocos\editors\Creator\3.7.3\resources\resources\3d\engine\bin\.cache\dev\editor\bundled\index.js:46841:38)
the project file
https://drive.google.com/file/d/1ypkV6Q1Cs4EbNnYjmY6Wrq2uJtt7czRq/view?usp=sharing
the car example project on 3.7.3 cocos creator
what I did –
- npm install rxjs --save
- addded import-map.json
- added simple rxjs test code on assets/script/main.ts