Fix request: document is not defined

[gabrielzevedo]

Using type: 'style', i have this error in my Nextjs application: ReferenceError: document is not defined;

Maybe it's worth checking if the document exists before referencing it

esbuild-sass-plugin/src/utils.ts

Lines 105 to 117 in f0e58c9

	const styleModule = (cssText: string, nonce?: string) => nonce ? `\
	const css = \`${cssText.replace(/([$`\\])/g, '\\$1')}\`;
	const style = document.createElement("style");
	style.setAttribute("nonce", ${nonce});
	style.appendChild(document.createTextNode(css));
	document.head.appendChild(style);
	export {css};
	` : `\
	const css = \`${cssText.replace(/([$`\\])/g, '\\$1')}\`;
	document.head
	.appendChild(document.createElement("style"))
	.appendChild(document.createTextNode(css));
	export {css};