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tsconfig - validate and warn about unknown/unexpected properties  #38006

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@levenleven

Description

@levenleven

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tsconfig validate

Suggestion

Currently tsc validates and warns about invalid properties in compilerOptions section which is great!. It would be really helpful if it would do the same for the root of the config file.

Use Cases

Easily identify mistakes/typos in configuration.

Examples

Sometimes people put complier option in the root by mistake, then scratching the head for hours trying to understand what is wrong.

In example below path mapping obviously won't work:

{
  "compilerOptions": {
    ...
  },
  "paths": {
    "@module": [
      "./src/utils/module"
    ]
  },
  "include": [
    ...
  ]
}

Checklist

My suggestion meets these guidelines:

  • This wouldn't be a breaking change in existing TypeScript/JavaScript code
  • This wouldn't change the runtime behavior of existing JavaScript code
  • This could be implemented without emitting different JS based on the types of the expressions
  • This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
  • This feature would agree with the rest of TypeScript's Design Goals.

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    Working as IntendedThe behavior described is the intended behavior; this is not a bug

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