refactor: Silence Rollup warnings regarding source maps & use directi…

…ves (#150)

src/index.ts

@@ -153,9 +153,23 @@ function preactPlugin({
 				build: {
 					rollupOptions: {
 						onwarn(warning, warn) {
-							// Silence Rollup's module-level directive warnings -- they're likely
-							// to all come from `node_modules` (RSCs) and won't be actionable.
-							if (warning.code === "MODULE_LEVEL_DIRECTIVE") return;
+							// Silence Rollup's module-level directive warnings re:"use client".
+							// They're likely to come from `node_modules` and won't be actionable.
+							if (
+								warning.code === "MODULE_LEVEL_DIRECTIVE" &&
+								warning.message.includes("use client")
+							)
+								return;
+							// ESBuild seemingly doesn't include mappings for directives, causing
+							// Rollup to emit warnings about missing source locations. This too is
+							// likely to come from `node_modules` and won't be actionable.
+							// evanw/esbuild#3548
+							if (
+								warning.code === "SOURCEMAP_ERROR" &&
+								warning.message.includes("resolve original location") &&
+								warning.pos === 0
+							)
+								return;
 							warn(warning);
 						},
 					},