no-prototype-builtins

NOTE: this rule is part of the recommended rule set.

Enable full set in deno.json:

{
  "lint": {
    "rules": {
      "tags": ["recommended"]
    }
  }
}

Enable full set using the Deno CLI:

deno lint --rules-tags=recommended

Disallows the use of Object.prototype builtins directly.

If objects are created via Object.create(null) they have no prototype specified. This can lead to runtime errors when you assume objects have properties from Object.prototype and attempt to call the following methods:

hasOwnProperty
isPrototypeOf
propertyIsEnumerable

Instead, it's always encouraged to call these methods from Object.prototype explicitly.

Invalid:

const a = foo.hasOwnProperty("bar");
const b = foo.isPrototypeOf("bar");
const c = foo.propertyIsEnumerable("bar");

Valid:

const a = Object.prototype.hasOwnProperty.call(foo, "bar");
const b = Object.prototype.isPrototypeOf.call(foo, "bar");
const c = Object.prototype.propertyIsEnumerable.call(foo, "bar");

no-prototype-builtins

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