[Bug] SyntaxError: Identifier '_class' has already been declared

## Bug Report

**Bug Summary**

Getting `SyntaxError: Identifier '_class' has already been declared` after adding a class declaration

**Steps To Reproduce**
1. Open the built-in tutorial excercises
2. Add a class declaration to the excercise source file
3. Run DBUX

**Expected behavior**

Not crash.

**Actual behavior**

Crashes with an error `SyntaxError: Identifier '_class' has already been declared`.

## Attachments

**Relevant Code**

```js
class Foo {}
```

**Dbux Output Log**

```
[Dbux ActionGroupType] Missing UserActionTypes in groupByActionType: PracticeSessionChanged, TestRunFinished, NewExerciseProgress, ExerciseProgressChanged, RunFile, RuntimeServerStatusChanged, ShowHelp, SelectTraceById, TreeViewOther, TreeViewCollapseChangeOther, TDValueRender, TDExecutionsGroupModeChanged, TDTraceUse, TDDebugUse, TDAsyncUse, TDAsyncGoToForkParent, TDAsyncGoToScheduler, DataFlowViewSearchModeChanged, DataFlowViewFilterModeChanged, DataFlowSelectTrace, DecorationVisibilityChanged, NavBarButtonsVisibilityChanged, ErrorLogNotificationVisibilityChanged, GlobalDebugAppUse, GlobalConsoleUse, GlobalProgramsUse, GlobalPackageSortModeChanged, SearchModeChanged, CallGraphVisibilityChanged, CallGraphGraphDocumentModeChanged, AsyncCallGraphTrace, AsyncCallGraphSchedulerTrace, AsyncCallGraphValueTrace, AsyncCallGraphError, StopProjectRunner, ProjectViewsVisibilityChanged, CheckSystem, ShowOutputChannel, ShowApplicationEntryFile, OpenWebsite, ShowExerciseIntroductionView, NewApplications, PathwaysVisibilityChanged, ProjectViewListModeChanged
[Dbux dbux-code] Starting Dbux v0.7.9 (mode=production)...
[Dbux projectControl] Initializing dbux-projects: projectsRoot = "/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/dbux_projects", dependencyRoot = "/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9", samplesRoot = "/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/samples"
[Dbux PracticeManager] getDbuxPath(), relativePath='@dbux/cli/bin/dbux.js', getDbuxRoot()='/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9', config={"dependencyRoot":"/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9","projectsRoot":"/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/dbux_projects","samplesRoot":"/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/samples","dbuxLanguage":"en"}
[Dbux installUtil] Checking library dependencies. Found 0 missing:
[Dbux TraceDecoConfig] Missing decoration config for trace types: BranchStatement, BranchExpression, BranchPush, BranchPop, BranchDecision, ResumeAsync, Finally, Catch, TryExit, FinallyExit, Yield, ResumeGen, PatternAssignment, PatternWriteVar, PatternWriteAndDeclareVar, PatternWriteME, Meta
[Dbux exerciseProgresses] entry does not have `_id` prop (only reports once): [object Object]
[Dbux Project todomvc-es6] [reloadExercises] found 11 in "undefined"
[Dbux Project node-fetch] [reloadExercises] found 1 in "undefined"
[Dbux Project javascript-algorithms] [reloadExercises] found 3 in "undefined"
[Dbux Project getting-started] [reloadExercises] found 11 in "undefined"
[Dbux Project express] [reloadExercises] found 22 in "undefined"
[Dbux Project async-js] [reloadExercises] found 2 in "undefined"
[Dbux Project 2048] [reloadExercises] found 4 in "undefined"
[Dbux PracticeManager] Cannot find exercise of id or name:express#20 in chapter#3 (express). Make sure exerciseIds in "exerciseList.json" are correct.
[Dbux PracticeManager] Cannot find exercise of id or name:express#21 in chapter#3 (express). Make sure exerciseIds in "exerciseList.json" are correct.
[Dbux Project javascript-algorithms] [reloadExercises] found 313 in "javascript-algorithms-all"
[Dbux Call Graph HostWrapper] client connected. - Starting host...
[Dbux Call Graph] silenced postMessage after Host shutdown: [{"messageType":2,"componentId":32,"commandName":"_publicInternal.dispose","args":[],"callId":47},{"messageType":2,"componentId":31,"commandName":"_publicInternal.dispose","args":[],"callId":48},{"messageType":2,"componentId":30,"commandName":"_publicInternal.dispose","args":[],"callId":49},{"messageType":2,"componentId":29,"commandName":"_publicInternal.dispose","args":[],"callId":50},{"messageType":2,"componentId":28,"commandName":"_publicInternal.dispose","args":[],"callId":51},{"messageType":2,"componentId":27,"commandName":"_publicInternal.dispose","args":[],"callId":52},{"messageType":2,"componentId":26,"commandName":"_publicInternal.dispose","args":[],"callId":53},{"messageType":2,"componentId":25,"commandName":"_publicInternal.dispose","args":[],"callId":54},{"messageType":2,"componentId":24,"commandName":"_publicInternal.dispose","args":[],"callId":55},{"messageType":2,"componentId":23,"commandName":"_publicInternal.dispose","args":[],"callId":56},{"messageType":2,"componentId":22,"commandName":"_publicInternal.dispose","args":[],"callId":57},{"messageType":2,"componentId":21,"commandName":"_publicInternal.dispose","args":[],"callId":58},{"messageType":2,"componentId":20,"commandName":"_publicInternal.dispose","args":[],"callId":59},{"messageType":2,"componentId":19,"commandName":"_publicInternal.dispose","args":[],"callId":60},{"messageType":2,"componentId":18,"commandName":"_publicInternal.dispose","args":[],"callId":61},{"messageType":2,"componentId":17,"commandName":"_publicInternal.dispose","args":[],"callId":62},{"messageType":2,"componentId":16,"commandName":"_publicInternal.dispose","args":[],"callId":63},{"messageType":2,"componentId":15,"commandName":"_publicInternal.dispose","args":[],"callId":64},{"messageType":2,"componentId":14,"commandName":"_publicInternal.dispose","args":[],"callId":65},{"messageType":2,"componentId":13,"commandName":"_publicInternal.dispose","args":[],"callId":66},{"messageType":2,"componentId":12,"commandName":"_publicInternal.dispose","args":[],"callId":67},{"messageType":2,"componentId":11,"commandName":"_publicInternal.dispose","args":[],"callId":68},{"messageType":2,"componentId":10,"commandName":"_publicInternal.dispose","args":[],"callId":69},{"messageType":2,"componentId":9,"commandName":"_publicInternal.dispose","args":[],"callId":70},{"messageType":2,"componentId":8,"commandName":"_publicInternal.dispose","args":[],"callId":71},{"messageType":2,"componentId":7,"commandName":"_publicInternal.dispose","args":[],"callId":72},{"messageType":2,"componentId":6,"commandName":"_publicInternal.dispose","args":[],"callId":73},{"messageType":2,"componentId":5,"commandName":"_publicInternal.dispose","args":[],"callId":74},{"messageType":2,"componentId":4,"commandName":"_publicInternal.dispose","args":[],"callId":75},{"messageType":2,"componentId":33,"commandName":"_publicInternal.dispose","args":[],"callId":76},{"messageType":2,"componentId":3,"commandName":"_publicInternal.dispose","args":[],"callId":77},{"messageType":2,"componentId":2,"commandName":"_publicInternal.dispose","args":[],"callId":78},{"messageType":2,"componentId":1,"commandName":"_publicInternal.dispose","args":[],"callId":79}]
[Dbux installUtil] Checking library dependencies. Found 0 missing:
[Dbux exec] > $ "node" --version
[Dbux exec] ("node" EXIT: code=0, signal=null)
[Dbux checkSystem] checkSystem() result: Dbux requires the following programs to be installed and available on your system in order to run smoothly. Please make sure, you have all of them installed.

✓ shell
found at "/bin/bash"
✓ node
found at "/Users/dmaretskyi/.nodenv/shims/node" (v16.17.1 satisfies 16)
✓ npm
found at "/Users/dmaretskyi/.nodenv/shims/npm"

SUCCESS! All system dependencies seem to be in order.
[Dbux net/listener] server listening on port :3374...
[Dbux PracticeManager] getDbuxPath(), relativePath='@dbux/cli/dist/linkOwnDependencies.js', getDbuxRoot()='/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9', config={"dependencyRoot":"/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9","projectsRoot":"/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/dbux_projects","samplesRoot":"/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/samples","dbuxLanguage":"en"}
[Dbux PracticeManager] getDbuxPath(), relativePath='@dbux/cli/bin/dbux.js', getDbuxRoot()='/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9', config={"dependencyRoot":"/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9","projectsRoot":"/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/dbux_projects","samplesRoot":"/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/samples","dbuxLanguage":"en"}

```

**Dbux Runtime (Console) Log**

```
The default interactive shell is now zsh.
To update your account to use zsh, please run `chsh -s /bin/zsh`.
For more details, please visit https://support.apple.com/kb/HT208050.
"node" --enable-source-maps --stack-trace-limit=10bash-3.2$ "node" --enable-source-maps --stack-trace-limit=1000 --enable-source-maps -r /Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/@dbux/cli/dist/linkOwnDependencies.js "/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/@dbux/cli/bin/dbux.js" run --esnext --pw=.* "/Users/dmaretskyi/.vscode/extensions/domi.LongestWordLength/for-bad.js" -- ting-started/find
[Dbux] run: /Users/dmaretskyi/.nodenv/versions/16.17.1/bin/node /Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/dbux_projects/getting-started/findLongestWordLength/for-bad.js
[Dbux] [moduleFilter] REGISTER ~/.vscode/extensions/domi.dbux-code-0.7.9/dbux_projects/getting-started/findLongestWordLength/for-bad.js (file)
[@babel/register] cacheRoot=/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/dbux_projects/getting-started, cacheDir=/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/dbux_projects/getting-started/node_modules/.cache/@babel/register
[@babel/register] Cache miss [FileModified] for "/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/dbux_projects/getting-started/findLongestWordLength/for-bad.js"
[@dbux/cli] command failed
[Caused By] SyntaxError: Identifier '_class' has already been declared
at Object.compileFunction (node:vm:360:18)
... 21 lines matching cause stack trace ...
at node:internal/main/run_main_module:17:47 {
name: 'NestedError',
cause: SyntaxError: Identifier '_class' has already been declared
at Object.compileFunction (node:vm:360:18)
at wrapSafe (node:internal/modules/cjs/loader:1055:15)
at Module._compile (node:internal/modules/cjs/loader:1090:27)
at Module._compile (/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/pirates/lib/index.js:119:24)
at Module._extensions..js (node:internal/modules/cjs/loader:1180:10)
at Object.newLoader [as .js] (/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/pirates/lib/index.js:123:7)
at Module.load (node:internal/modules/cjs/loader:1004:32)
at Function.Module._load (node:internal/modules/cjs/loader:839:12)
at Module.require (node:internal/modules/cjs/loader:1028:19)
at require (node:internal/modules/cjs/helpers:102:18)
at requireDynamic (/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/@dbux/cli/dist/commands/run.js:1:9685)
at /Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/@dbux/cli/dist/commands/run.js:1:7593
at Object.handler (/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/@dbux/cli/dist/commands/run.js:1:8177)
at Object.runCommand (/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/yargs/build/index.cjs:446:48)
at Object.parseArgs [as _parseArgs] (/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/yargs/build/index.cjs:2697:57)
at Object.get [as argv] (/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/yargs/build/index.cjs:2651:25)
at Object. (/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/@dbux/cli/bin/dbux.js:22:3)
at Module._compile (node:internal/modules/cjs/loader:1126:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1180:10)
at Module.load (node:internal/modules/cjs/loader:1004:32)
at Function.Module._load (node:internal/modules/cjs/loader:839:12)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
at node:internal/main/run_main_module:17:47
}
[@dbux/cli] waiting 20s for process to finish...
exiting...
Trace: [Dbux [@dbux/runtime]] NOTE: process.exit(-1) was called by the application.
at E (/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/@dbux/runtime/dist/index-node.js:2:4345)
at /Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/@dbux/runtime/dist/index-node.js:2:3652
at process.exit (/Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/@dbux/runtime/dist/index-node.js:2:437447)
at /Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9/node_modules/@dbux/cli/dist/commands/run.js:1:8544
[Dbux [@dbux/runtime]] Dbux is trying to delay shutdown (process.exit) by 60s...
[Dbux [@dbux/runtime]] exiting now.
```

**Screenshots**

**System (please complete the following information):**
- OS: macos
- Dbux VSCode Extension version: 0.7.9
- Affected Dbux Packages (+ version numbers):

```
➜ domi.dbux-code-0.7.9 npm list
dbux-code@0.7.9 /Users/dmaretskyi/.vscode/extensions/domi.dbux-code-0.7.9
├── @babel/plugin-proposal-class-properties@7.18.6
├── @dbux/babel-plugin@0.7.9
├── @dbux/cli@0.7.9
├── @dbux/common-node@0.7.9
├── @dbux/common@0.7.9
├── @dbux/data@0.7.9
├── @dbux/graph-common@0.7.9
├── @dbux/graph-host@0.7.9
├── @dbux/projects@0.7.9
├── @dbux/runtime@0.7.9
├── @types/glob@7.2.0
├── @types/node@16.18.40
├── @types/vscode@1.81.0
├── firebase@9.23.0
├── glob@7.2.3
├── i18next@19.9.2
├── lockfile@1.0.4
├── lodash@4.17.21
├── moment@2.29.4
├── nanoevents@2.0.0
├── open@7.4.2
├── serialize-javascript@5.0.1
├── socket.io@4.7.2
├── strip-ansi@7.1.0
├── strip-color@0.1.0
├── typescript@3.9.10
├── uuid@8.3.2
├── vsce@2.15.0
└── vscode-test@1.6.1
```

- `"@babel/plugin-proposal-class-properties": "^7.18.6"`

- node 16

**Additional context**

After installing the vscode extension I was getting an error about `@babel/plugin-proposal-class-properties` package missing. So I've installed it manually in the tutorial excercises workspace:
```
"@babel/plugin-proposal-class-properties": "^7.18.6"
```