feat(exports): add bin option to auto-generate package.json bin field (#869)

* feat(exports): add `bin` option to auto-generate package.json bin field

Adds `exports.bin` option that auto-generates the `bin` field in
package.json based on built entry chunks.

Supports three forms:
- `true`: auto-detect entry chunks with shebangs
- `string`: specify source file, bin name defaults to package name
- `Record<string, string>`: map command names to source files

* feat(config): use mergeConfig for workspace config merging and support variadic overrides

- Replace shallow spread merging with deep `mergeConfig` in workspace resolution
- Update `mergeConfig` to accept multiple overrides via rest params

* fix

Author: sxzz

dts.snapshot.json

@@ -128,7 +128,7 @@
     "DepsPlugin": "declare function DepsPlugin(_: ResolvedConfig, _: TsdownBundle): Plugin",
     "DevtoolsOptions": "interface DevtoolsOptions extends NonNullable<InputOptions['devtools']> {\n ui?: boolean | Partial<StartOptions>\n clean?: boolean\n}",
     "ExeOptions": "interface ExeOptions extends ExeExtensionOptions {\n seaConfig?: Omit<SeaConfig, 'main' | 'output' | 'mainFormat'>\n fileName?: string | ((_: RolldownChunk) => string)\n outDir?: string\n}",
-    "ExportsOptions": "interface ExportsOptions {\n devExports?: boolean | string\n packageJson?: boolean\n all?: boolean\n exclude?: (RegExp | string)[]\n legacy?: boolean\n customExports?: Record<string, any> | ((_: Record<string, any>, _: { pkg: PackageJson; chunks: ChunksByFormat; isPublish: boolean }) => Awaitable<Record<string, any>>)\n inlinedDependencies?: boolean\n}",
+    "ExportsOptions": "interface ExportsOptions {\n devExports?: boolean | string\n packageJson?: boolean\n all?: boolean\n exclude?: (RegExp | string)[]\n legacy?: boolean\n customExports?: Record<string, any> | ((_: Record<string, any>, _: { pkg: PackageJson; chunks: ChunksByFormat; isPublish: boolean }) => Awaitable<Record<string, any>>)\n inlinedDependencies?: boolean\n bin?: boolean | string | Record<string, string>\n}",
     "Format": "type Format = ModuleFormat",
     "InlineConfig": "interface InlineConfig extends UserConfig {\n config?: boolean | string\n configLoader?: 'auto' | 'native' | 'unrun'\n filter?: RegExp | Arrayable<string>\n}",
     "NoExternalFn": "type NoExternalFn = (_: string, _: string | undefined) => boolean | null | undefined | void",

packages/create-tsdown/tsdown.config.ts

@@ -2,4 +2,7 @@ import type { UserConfig } from '../../src/config.ts'
 
 export default {
   entry: ['./src/{index,run}.ts'],
+  exports: {
+    bin: true,
+  },
 } satisfies UserConfig

packages/migrate/tsdown.config.ts

@@ -3,4 +3,7 @@ import type { UserConfig } from '../../src/config.ts'
 export default {
   name: 'migrate',
   entry: ['./src/{index,run}.ts'],
+  exports: {
+    bin: true,
+  },
 } satisfies UserConfig