feat: support nested subpaths (#280)

src/build.ts

@@ -1,6 +1,6 @@
 import Module from "node:module";
 import { promises as fsp } from "node:fs";
-import { resolve, relative, basename } from "pathe";
+import { resolve, relative, isAbsolute, normalize } from "pathe";
 import type { PackageJson } from "pkg-types";
 import chalk from "chalk";
 import { consola } from "consola";
@@ -147,7 +147,13 @@ async function _build(
 
   for (const entry of options.entries) {
     if (typeof entry.name !== "string") {
-      entry.name = removeExtension(basename(entry.input));
+      let relativeInput = isAbsolute(entry.input)
+        ? relative(rootDir, entry.input)
+        : normalize(entry.input);
+      if (relativeInput.startsWith("./")) {
+        relativeInput = relativeInput.slice(2);
+      }
+      entry.name = removeExtension(relativeInput.replace(/^src\//, ""));
     }
 
     if (!entry.input) {

test/fixture/build.config.ts

@@ -1,20 +1,22 @@
 import { defineBuildConfig } from "../../src";
 
 export default defineBuildConfig([
+  // Auto preset
+  {},
+  // Custom preset
   {
     preset: "./build.preset",
     rollup: {
       emitCJS: true,
     },
     entries: [
       "./src/index.ts",
+      "./src/nested/subpath.ts",
       { input: "src/runtime/", outDir: "dist/runtime" },
       { input: "src/schema", builder: "untyped" },
     ],
   },
-  /**
-   * On top of that we run another build with a different config.
-   */
+  // Minified
   {
     name: "minified",
     entries: ["src/index"],

test/fixture/package.json

@@ -2,6 +2,7 @@
   "name": "fixture",
   "private": "true",
   "exports": {
-    ".": "./dist/index.mjs"
+    ".": "./dist/index.mjs",
+    "./nested/subpath": "./dist/nested/subpath.mjs"
   }
 }

test/fixture/src/nested/subpath.ts

@@ -0,0 +1 @@
+export default "nested/subpath";