no-obj-calls

Math, JSON, Reflect, Atomics, Intl and Temporal start with a capital letter, but they're plain objects that hold functions. Math() and new JSON() throw a TypeError when they run.

The rule follows the object through variables and through globalThis.

This rule is on by default in JavaScript files. It's off in TypeScript files, where TypeScript reports the same mistake.

Configure

On by default as an error. To turn it off:

[lint.rules]
"no-obj-calls" = "off" # or "warn"

Examples

Reported:

const random = Math();

const parser = new JSON();

const format = Intl;
const text = format("en-US");

const now = globalThis.Reflect();

Not reported:

const random = Math.random();
const data = JSON.parse(body);
const text = new Intl.NumberFormat("en-US").format(total);