toString() 
This function is part of IconSet class in Iconify Tools.
Function toString() exports icon as string.
Usage 
Function has the following parameters:
- name, string. Icon name.
 - customisations, IconifyIconCustomisations. Optional list of customisations.
 
Function returns rendered icon as string on success, null if icon does not exist.
Customisations 
If customisations is not set, default value is:
json
{
    "width": "auto",
    "height": "auto"
}which results in width and height of icon matching viewBox (see example below).
If you want to use 1em height, use the following customisations:
json
{
    "height": "1em"
}Example 
example.ts
ts
import { blankIconSet } from '@iconify/tools';
const iconSet = blankIconSet('');
 iconSet.setIcon('add', {
    body: '<g fill="currentColor"><path d="M14 7v1H8v6H7V8H1V7h6V1h1v6h6z"/></g>',
 });
// Export icon
console.log(iconSet.toString('add'));Result:
svg
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="16" height="16" preserveAspectRatio="xMidYMid meet" viewBox="0 0 16 16"><g fill="currentColor"><path d="M14 7v1H8v6H7V8H1V7h6V1h1v6h6z"/></g></svg>