prefer-nothing.md

Enforces use of nothing constant over empty templates (prefer-nothing)

nothing is a constant provided by lit which may be used to render nothing. This is far more efficient than creating an empty template.

This means you can do something like:

_render() {
  if (!condition) {
    return nothing;
  }

  return html`Hello there`;
}

Rule Details

This rule enforces the use of nothing rather than empty templates.

The following patterns are considered warnings:

html``;
const tpl = html``;

function render() {
  return html``;
}

The following patterns are not warnings:

html`foo`;
html` `; // whitespace

When Not To Use It

If you prefer using empty templates or don't yet have lit 2.x (which provides the nothing constant), you should not use this rule.