[TypeScript] Catch unsafe use of "this" in TypeScript functions

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this is probably the most tricky thing to use in javascript and therefore TypeScript. Fortunately there is a TypeScript compiler flag noImplicit this that can help catch unsafe usages so beginners don‘t get caught off guard.

 

// tsconfig.json

{
  "compilerOptions": {
    "noImplicitThis": true,

...
}

 

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