omit deprecation warning completely for now

src/compiler/compile/index.ts

@@ -46,8 +46,6 @@ const valid_css_values = [
 const regex_valid_identifier = /^[a-zA-Z_$][a-zA-Z_$0-9]*$/;
 const regex_starts_with_lowercase_character = /^[a-z]/;
 
-let has_shown_deprecation = false;
-
 function validate_options(options: CompileOptions, warnings: Warning[]) {
 	const { name, filename, loopGuardTimeout, dev, namespace, css } = options;
 
@@ -91,16 +89,15 @@ function validate_options(options: CompileOptions, warnings: Warning[]) {
 
 	if (css === true || css === false) {
 		options.css = css === true ? 'injected' : 'external';
-		if (!has_shown_deprecation) {
-			has_shown_deprecation=true;
-			const message = `options.css as a boolean is deprecated. Use '${options.css}' instead of ${css}.`;
-			warnings.push({
-				code: 'options-css-boolean-deprecated',
-				message,
-				filename,
-				toString: () => message
-			});
-		}
+		// possibly show this warning once we decided how Svelte 4 looks like
+		// const message = `options.css as a boolean is deprecated. Use '${options.css}' instead of ${css}.`;
+		// warnings.push({
+		// 	code: 'options-css-boolean-deprecated',
+		// 	message,
+		// 	filename,
+		// 	toString: () => message
+		// });
+		// }
 	}
 
 	if (namespace && valid_namespaces.indexOf(namespace) === -1) {