astro/tsconfigs/strictest.json

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

{
  "$schema": "https://json.schemastore.org/tsconfig",
  "extends": "./strict.json",
  "compilerOptions": {
    // Report errors for fallthrough cases in switch statements
    "noFallthroughCasesInSwitch": true,
    // Force functions designed to override their parent class to be specified as `override`.
    "noImplicitOverride": true,
    // Force functions to specify that they can return `undefined` if a possible code path does not return a value.
    "noImplicitReturns": true,
    // Report an error when a variable is declared but never used.
    "noUnusedLocals": true,
    // Report an error when a parameter is declared but never used.
    "noUnusedParameters": true,
    // Force the usage of the indexed syntax to access fields declared using an index signature.
    "noUncheckedIndexedAccess": true,
    // Report an error when the value `undefined` is given to an optional property that doesn't specify `undefined` as a valid value.
    "exactOptionalPropertyTypes": true,
    // Report an error for unreachable code instead of just a warning.
    "allowUnreachableCode": false,
    // Report an error for unused labels instead of just a warning.
    "allowUnusedLabels": false
  }
}