[@typescript-eslint/no-unnecessary-type-assertion] False positives for "as const" assertions with template literals

[klassm]

Before You File a Bug Report Please Confirm You Have Done The Following...

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have searched for related issues and found none that matched my issue.
• I have read the FAQ and my problem is not listed.

Playground Link

https://typescript-eslint.io/play/#ts=5.4.2&fileType=.tsx&code=KYDwDg9gTgLgBAYwgOwM7zFCAjANsAWwClUUAVATzGAFUoBLABSmADN6Q4BeOAcgAsYMMKgBcAenHAoWKKgB0-CAWABaJMmTAEMeUgLjecAIapEKdAG4AsACgN6ONNkAhU7Qbc4AAwAkAb0wcfGJSZEpqOiYWdhAAXw0YYGQYVGkAN3oEYFRvEzMHGBtbO1BIWDgYKmA4ZmDCEhQvACVtaAATAB50BmQAcwAaOABXZABrZAgAd2QAPjgAMjh-OzhK6tEfAKrqCFY4ILwGsIiPaLYOOICe%2Bn648WuYXr6472K44tLwaHhCuAA1Yy4ejtYwwegoACiMmgmzqR1CTR4K1sax2wE2fn8zmgbjSUXu6SBILBEOQqhxUG8AzsHzsQA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1tiacTJTIAhtEK0ipWkOTJE0fJQ5N0UOdA7RI4MAF8QOoA&tsconfig=N4KAvkA&tokens=false

Repro Code

export const problemJsonTypeUriPrefix = 'https://errors.home-connect.com/';
const errorBaseUri = `${problemJsonTypeUriPrefix}contentservices` as const;

export type ProblemJson = Record<string, unknown> & {
  type: `${typeof problemJsonTypeUriPrefix}${string}/${string}`;
};

export const ValidationError: ProblemJson = {
  type: `${errorBaseUri}/validation-error`,
};

ESLint Config

module.exports = {
  "rules": {
    "@typescript-eslint/no-unnecessary-type-assertion": "error"
  }
}

tsconfig

{
}

Expected Result

The as const is kept.

Actual Result

The as const is marked as unnecessary.

Additional Info

See comment here.

[bradzacher]

@SimonSchick as per the issue - you want #8721, not this issue.