prefer-primordials

Suggests using frozen intrinsics from primordials rather than the default globals.

This lint rule is designed to be dedicated to Deno's internal code. Normal users don't have to run this rule for their code.

Primordials are a frozen set of all intrinsic objects in the runtime, which we should use in the Deno's internal to avoid the risk of prototype pollution. This rule detects the direct use of global intrinsics and suggests replacing it with the corresponding one from the primordials object.

One such example is:

const arr = getSomeArrayOfNumbers();
const evens = arr.filter((val) => val % 2 === 0);

The second line of this example should be:

const evens = primordials.ArrayPrototypeFilter(arr, (val) => val % 2 === 0);

Invalid:

const arr = new Array();

const s = JSON.stringify({});

const i = parseInt("42");

const { ownKeys } = Reflect;

Valid:

const { Array } = primordials;
const arr = new Array();

const { JSONStringify } = primordials;
const s = JSONStringify({});

const { NumberParseInt } = primordials;
const i = NumberParseInt("42");

const { ReflectOwnKeys } = primordials;