no-unsafe-member-access
Disallow member access on a value with type
any.
🧠
Extending "plugin:@typescript-eslint/recommended-requiring-type-checking" in an ESLint configuration enables this rule.
💭
This rule requires type information to run.
The any type in TypeScript is a dangerous "escape hatch" from the type system.
Using any disables many type checking rules and is generally best used only as a last resort or when prototyping code.
Despite your best intentions, the any type can sometimes leak into your codebase.
Accessing a member of an any-typed value creates a potential type safety hole and source of bugs in your codebase.
This rule disallows member access on any variable that is typed as any.
.eslintrc.cjs
module.exports = {
"rules": {
"@typescript-eslint/no-unsafe-member-access": "error"
}
};
Examples
- ❌ Incorrect
- ✅ Correct
declare const anyVar: any;
declare const nestedAny: { prop: any };
anyVar.a;
anyVar.a.b;
anyVar['a'];
anyVar['a']['b'];
nestedAny.prop.a;
nestedAny.prop['a'];
const key = 'a';
nestedAny.prop[key];
// Using an any to access a member is unsafe
const arr = [1, 2, 3];
arr[anyVar];
nestedAny[anyVar];
declare const properlyTyped: { prop: { a: string } };
properlyTyped.prop.a;
properlyTyped.prop['a'];
const key = 'a';
properlyTyped.prop[key];
const arr = [1, 2, 3];
arr[1];
const idx = 1;
arr[idx];
arr[idx++];
This rule is not configurable.