fix: avoid adding extra additional export conditions

src/build/plugins.ts

@@ -64,7 +64,7 @@ export async function baseBuildPlugins(nitro: Nitro, base: BaseBuildConfig) {
     plugins.push(
       externals({
         rootDir: nitro.options.rootDir,
-        conditions: nitro.options.exportConditions || ["default"],
+        conditions: nitro.options.exportConditions!,
         exclude: [...base.noExternal],
         include: isDevOrPrerender
           ? undefined

src/config/resolvers/export-conditions.ts

@@ -9,51 +9,28 @@ export async function resolveExportConditionsOptions(options: NitroOptions) {
 }
 
 function _resolveExportConditions(
-  conditions: string[],
+  userConditions: string[],
   opts: { dev: boolean; node: boolean; wasm?: boolean }
 ) {
-  const resolvedConditions: string[] = [];
+  const conditions: string[] = [...userConditions.filter((c) => !c.startsWith("!"))];
 
-  // 1. Add dev or production
-  resolvedConditions.push(opts.dev ? "development" : "production");
+  conditions.push(opts.dev ? "development" : "production");
 
-  // 2. Add user specified conditions
-  resolvedConditions.push(...conditions);
-
-  // 3. Add runtime conditions (node or web)
-  if (opts.node) {
-    resolvedConditions.push("node");
-  } else {
-    // https://runtime-keys.proposal.wintercg.org/
-    resolvedConditions.push(
-      "wintercg",
-      "worker",
-      "web",
-      "browser",
-      "workerd",
-      "edge-light",
-      "netlify",
-      "edge-routine",
-      "deno"
-    );
-  }
-
-  // 4. Add unwasm conditions
   if (opts.wasm) {
-    resolvedConditions.push("wasm", "unwasm");
+    conditions.push("wasm", "unwasm");
   }
 
-  // 5. Add default conditions
-  // "module" is NOT A STANDARD CONDITION but widely used in the ecosystem adding helps with compatibility
-  resolvedConditions.push("import", "default", "module");
+  if (opts.node) {
+    conditions.push("node");
+  }
 
-  // 6. Auto detect bun and deno (builder)
   if ("Bun" in globalThis) {
-    resolvedConditions.push("bun");
+    conditions.push("bun");
   } else if ("Deno" in globalThis) {
-    resolvedConditions.push("deno");
+    conditions.push("deno");
   }
 
-  // Dedup with preserving order
-  return resolvedConditions.filter((c, i) => resolvedConditions.indexOf(c) === i);
+  const negated = new Set(userConditions.filter((c) => c.startsWith("!")).map((c) => c.slice(1)));
+
+  return [...new Set(conditions)].filter((c) => !negated.has(c));
 }

src/presets/bun/preset.ts

@@ -5,7 +5,7 @@ const bun = defineNitroPreset(
     entry: "./bun/runtime/bun",
     serveStatic: true,
     // https://bun.sh/docs/runtime/modules#resolution
-    exportConditions: ["bun", "node", "import", "default"],
+    exportConditions: ["bun"],
     commands: {
       preview: "bun run ./server/index.mjs",
     },