• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have read the FAQ and my problem is not listed.

Repro

const result: { [key: number]: number } = {};
result[1] ??= 1;

{
  "rules": {
    '@typescript-eslint/no-unnecessary-condition': ['error', {
      allowConstantLoopConditions: true,
      allowRuleToRunWithoutStrictNullChecksIKnowWhatIAmDoing: false,
    }],
  }
}

Expected Result

An error of that rule to be reported.

Actual Result

No error.

Additional Info

if (result[1] == null) {
  result[1] = 1;
}

This does result in an error so the other code should too.

Versions