Repro

{
  "rules": {
    "@typescript-eslint/typedef": [
      "error",
      {
        "variableDeclaration": true
      },
    ],
  }
}

// error @typescript-eslint/typedef : expected item to have a type annotation
for (const item of ['a', 'b']) {
}

Expected Result

The error should not be reported for a for..of loop variable.

Actual Result

The error is reported. The error is impossible to fix, because TypeScript does not allow type annotations here.

Additional Info

TSLint encountered this same problem as palantir/tslint#743.

Their fix is here and might be relevant: palantir/tslint#745

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