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Rslint

    non-nullable-type-assertion-style

    Configuration

    rslint.config.ts
    import { defineConfig, ts } from '@rslint/core';

export default defineConfig([
  ts.configs.recommended,
  {
    rules: {
      '@typescript-eslint/non-nullable-type-assertion-style': 'error',
    },
  },
]);

    Rule Details

    Enforce non-null assertions over explicit type assertions when the asserted type is the same as the original type minus null and undefined. A non-null assertion (!) is a more concise way to remove null and undefined from a type than using an as type assertion.

    Examples of incorrect code for this rule:

    const foo = bar as string; // when bar is string | null
const baz = bar as string; // when bar is string | undefined
const qux = bar as string; // when bar is string | null | undefined

    Examples of correct code for this rule:

    const foo = bar!;
const baz = bar as string | null;
const qux = bar as SomeDifferentType;

    Original Documentation