/augment-websocket.ts has incorrect types

[dmytro-kostiushko]

If you have a tsconfigration option "strictNullChecks" set to true - typescript will throw a compilation error stating that
origOnClose is possibly null.

tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "typeRoots": [
      "./types",
      "./node_modules/@types"
    ],
    "lib": [
      "dom",
      "dom.iterable",
      "esnext"
    ],
    "downlevelIteration": true,
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "noImplicitThis": true,
    "alwaysStrict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "forceConsistentCasingInFileNames": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx"
  },
  "include": [
    "src"
  ]
}

TypeScript error in /Users/admin/IdeaProjects/processing-application-react-app/node_modules/@stomp/stompjs/src/augment-websocket.ts(32,5):
Object is possibly 'null'. TS2531

30 |     this.close();
31 | 

32 | origOnClose.call(this, {
| ^
33 | code: 4001,
34 | reason: 'Heartbeat failure, discarding the socket',
35 | wasClean: false,

[kum-deepak]

Consider for v7.

[kum-deepak]

The next version is compiled with strictNullChecks set. See commit 06ff8fc.