feat: support exportConditions and add worker default conditions

src/options.ts

@@ -366,6 +366,12 @@ export async function loadOptions(
   // Resolve plugin paths
   options.plugins = options.plugins.map((p) => resolvePath(p, options));
 
+  // Export conditions
+  options.exportConditions = _resolveExportConditions(
+    options.exportConditions,
+    { dev: options.dev, node: options.node }
+  );
+
   // Add open-api endpoint
   if (options.dev && options.experimental.openAPI) {
     options.handlers.push({
@@ -458,3 +464,43 @@ export function normalizeRouteRules(
   }
   return normalizedRules;
 }
+
+function _resolveExportConditions(
+  conditions: string[] = [],
+  opts: { dev: boolean; node: boolean }
+) {
+  const resolvedConditions: string[] = [];
+
+  // 1. Add dev or production
+  resolvedConditions.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",
+      "lagon",
+      "netlify",
+      "edge-routine",
+      "deno"
+    );
+  }
+
+  // 4. Add default conditions
+  resolvedConditions.push("import", "module", "default");
+
+  // Dedup with preserving order
+  return resolvedConditions.filter(
+    (c, i) => resolvedConditions.indexOf(c) === i
+  );
+}

src/presets/bun.ts

@@ -4,14 +4,8 @@ import { defineNitroPreset } from "../preset";
 export const bun = defineNitroPreset({
   extends: "node-server",
   entry: "#internal/nitro/entries/bun",
-  externals: {
-    traceInclude: ["ofetch", "uncrypto", "node-fetch-native"].map((id) =>
-      resolvePathSync(id, {
-        url: import.meta.url,
-        conditions: ["bun"],
-      })
-    ),
-  },
+  // https://bun.sh/docs/runtime/modules#resolution
+  exportConditions: ["bun", "worker", "module", "node", "default", "browser"],
   commands: {
     preview: "bun run ./server/index.mjs",
   },

src/presets/cloudflare-module.ts

@@ -6,6 +6,7 @@ import type { Nitro } from "../types";
 export const cloudflareModule = defineNitroPreset({
   extends: "base-worker",
   entry: "#internal/nitro/entries/cloudflare-module",
+  exportConditions: ["workerd"],
   commands: {
     preview: "npx wrangler dev ./server/index.mjs --site ./public --local",
     deploy: "npx wrangler deploy",

src/presets/cloudflare-pages.ts

@@ -8,6 +8,7 @@ import type { Nitro } from "../types";
 export const cloudflarePages = defineNitroPreset({
   extends: "cloudflare",
   entry: "#internal/nitro/entries/cloudflare-pages",
+  exportConditions: ["workerd"],
   commands: {
     preview: "npx wrangler pages dev ./",
     deploy: "npx wrangler pages deploy ./",

src/presets/cloudflare.ts

@@ -6,6 +6,7 @@ import type { Nitro } from "../types";
 export const cloudflare = defineNitroPreset({
   extends: "base-worker",
   entry: "#internal/nitro/entries/cloudflare",
+  exportConditions: ["workerd"],
   commands: {
     preview: "npx wrangler dev ./server/index.mjs --site ./public --local",
     deploy: "npx wrangler deploy",

src/presets/deno-deploy.ts

@@ -2,6 +2,7 @@ import { defineNitroPreset } from "../preset";
 
 export const denoDeploy = defineNitroPreset({
   entry: "#internal/nitro/entries/deno-deploy",
+  exportConditions: ["deno"],
   node: false,
   noExternals: true,
   serveStatic: "deno",

src/presets/deno-server.ts

@@ -10,6 +10,7 @@ import { ImportMetaRe } from "../rollup/plugins/import-meta";
 export const denoServer = defineNitroPreset({
   extends: "node-server",
   entry: "#internal/nitro/entries/deno-server",
+  exportConditions: ["deno"],
   commands: {
     preview: "deno task --config ./deno.json start",
   },

src/presets/lagon.ts

@@ -18,6 +18,7 @@ export interface LagonFunctionConfig {
 export const lagon = defineNitroPreset({
   extends: "base-worker",
   entry: "#internal/nitro/entries/lagon",
+  exportConditions: ["lagon"],
   commands: {
     preview: "npm run dev --prefix ./",
     deploy: "npm run deploy --prefix ./",

src/presets/netlify.ts

@@ -53,6 +53,7 @@ export const netlifyBuilder = defineNitroPreset({
 export const netlifyEdge = defineNitroPreset({
   extends: "base-worker",
   entry: "#internal/nitro/entries/netlify-edge",
+  exportConditions: ["netlify"],
   output: {
     serverDir: "{{ rootDir }}/.netlify/edge-functions/server",
     publicDir: "{{ rootDir }}/dist",

src/presets/vercel.ts

@@ -81,6 +81,7 @@ export const vercel = defineNitroPreset({
 export const vercelEdge = defineNitroPreset({
   extends: "base-worker",
   entry: "#internal/nitro/entries/vercel-edge",
+  exportConditions: ["edge-light"],
   output: {
     dir: "{{ rootDir }}/.vercel/output",
     serverDir: "{{ output.dir }}/functions/__nitro.func",

src/rollup/config.ts

@@ -6,11 +6,11 @@ import { defu } from "defu";
 // import terser from "@rollup/plugin-terser"; // TODO: Investigate jiti issue
 import type { RollupWasmOptions } from "@rollup/plugin-wasm";
 import commonjs from "@rollup/plugin-commonjs";
-import { nodeResolve } from "@rollup/plugin-node-resolve";
 import alias from "@rollup/plugin-alias";
 import json from "@rollup/plugin-json";
 import wasmPlugin from "@rollup/plugin-wasm";
 import inject from "@rollup/plugin-inject";
+import { nodeResolve } from "@rollup/plugin-node-resolve";
 import { isWindows } from "std-env";
 import { visualizer } from "rollup-plugin-visualizer";
 import * as unenv from "unenv";
@@ -404,13 +404,7 @@ export const plugins = [
             processCwd: nitro.options.rootDir,
             exportsOnly: true,
           },
-          exportConditions: [
-            "default",
-            nitro.options.dev ? "development" : "production",
-            "module",
-            "node",
-            "import",
-          ],
+          exportConditions: nitro.options.exportConditions,
         })
       )
     );
@@ -425,13 +419,7 @@ export const plugins = [
       modulePaths: nitro.options.nodeModulesDirs,
       // 'module' is intentionally not supported because of externals
       mainFields: ["main"],
-      exportConditions: [
-        "default",
-        nitro.options.dev ? "development" : "production",
-        "module",
-        "node",
-        "import",
-      ],
+      exportConditions: nitro.options.exportConditions,
     })
   );
 

src/rollup/plugins/externals.ts

@@ -181,10 +181,10 @@ export function externals(opts: NodeExternalsOptions): Plugin {
       }
 
       // Trace used files using nft
-      const _fileTrace = await nodeFileTrace(
-        [...trackedExternals],
-        opts.traceOptions
-      );
+      const _fileTrace = await nodeFileTrace([...trackedExternals], {
+        conditions: opts.exportConditions,
+        ...opts.traceOptions,
+      });
 
       // Read package.json with cache
       const packageJSONCache = new Map(); // pkgDir => contents

src/types/nitro.ts

@@ -267,6 +267,7 @@ export interface NitroOptions extends PresetOptions {
   analyze: false | PluginVisualizerOptions;
   replace: Record<string, string | ((id: string) => string)>;
   commonJS?: RollupCommonJSOptions;
+  exportConditions?: string[];
 
   // Advanced
   typescript: {