replaceCssImport(chunk, oldUrl, newUrl) {
		const publicPath = this.publicPath;
		chunk.code = replaceSimpleFunctionCall(chunk.code, (fn, url, quote) => {
			if (publicPath && url.startsWith(publicPath)) url = url.slice(publicPath.length);
			if (url === oldUrl || (Array.isArray(oldUrl) && oldUrl.includes(url))) {
				let rep = typeof newUrl === 'function' ? newUrl(url, fn, quote) : newUrl;
				if (rep === false) return 'null';
				if (typeof rep === 'string') {
					rep = publicPath ? toImport(publicPath, rep) : JSON.stringify(rep);
				}
				return `${fn}(${rep})`;
			}
		});
	}
Replace CSS "imports" of the form `style("/url")` within a Chunk.
Return `false` to remove the call.
@param {Chunk} chunk
@param {string|string[]} oldUrl
@param {string|boolean|((url:string,fn:string,quote:string)=>string|boolean|null|undefined)} newUrl