fix(cli): extra line break in the tail of dts file (#2255)

cli/src/utils/__tests__/__snapshots__/typegen.spec.ts.md

@@ -614,7 +614,6 @@ Generated by [AVA](https://avajs.dev).
       export function xxh128(input: Buffer): bigint␊
       export function xxh3_64(input: Buffer): bigint␊
     }␊
-    ␊
     `
 
 ## should process type def with noConstEnum correctly
@@ -1169,5 +1168,4 @@ Generated by [AVA](https://avajs.dev).
       export function xxh128(input: Buffer): bigint␊
       export function xxh3_64(input: Buffer): bigint␊
     }␊
-    ␊
     `

cli/src/utils/typegen.ts

@@ -92,39 +92,43 @@ export async function processTypeDef(
   const groupedDefs = preprocessTypeDef(defs)
 
   header = header ?? ''
-  let dts = ''
 
-  sortBy(Array.from(groupedDefs), ([namespace]) => namespace).forEach(
-    ([namespace, defs]) => {
-      if (namespace === TOP_LEVEL_NAMESPACE) {
-        for (const def of defs) {
-          dts += prettyPrint(def, constEnum, 0) + '\n\n'
-          switch (def.kind) {
-            case TypeDefKind.Const:
-            case TypeDefKind.Enum:
-            case TypeDefKind.StringEnum:
-            case TypeDefKind.Fn:
-            case TypeDefKind.Struct: {
-              exports.push(def.name)
-              if (def.original_name && def.original_name !== def.name) {
-                exports.push(def.original_name)
+  const dts =
+    sortBy(Array.from(groupedDefs), ([namespace]) => namespace)
+      .map(([namespace, defs]) => {
+        if (namespace === TOP_LEVEL_NAMESPACE) {
+          return defs
+            .map((def) => {
+              switch (def.kind) {
+                case TypeDefKind.Const:
+                case TypeDefKind.Enum:
+                case TypeDefKind.StringEnum:
+                case TypeDefKind.Fn:
+                case TypeDefKind.Struct: {
+                  exports.push(def.name)
+                  if (def.original_name && def.original_name !== def.name) {
+                    exports.push(def.original_name)
+                  }
+                  break
+                }
+                default:
+                  break
               }
-              break
-            }
-            default:
-              break
+              return prettyPrint(def, constEnum, 0)
+            })
+            .join('\n\n')
+        } else {
+          exports.push(namespace)
+          let declaration = ''
+          declaration += `export declare namespace ${namespace} {\n`
+          for (const def of defs) {
+            declaration += prettyPrint(def, constEnum, 2, true) + '\n'
           }
+          declaration += '}'
+          return declaration
         }
-      } else {
-        exports.push(namespace)
-        dts += `export declare namespace ${namespace} {\n`
-        for (const def of defs) {
-          dts += prettyPrint(def, constEnum, 2, true) + '\n'
-        }
-        dts += '}\n\n'
-      }
-    },
-  )
+      })
+      .join('\n\n') + '\n'
 
   if (dts.indexOf('ExternalObject<') > -1) {
     header += `

examples/napi/__tests__/__snapshots__/typegen.spec.ts.md

@@ -854,5 +854,4 @@ Generated by [AVA](https://avajs.dev).
       export function xxh128(input: Buffer): bigint␊
       export function xxh3_64(input: Buffer): bigint␊
     }␊
-    ␊
     `

examples/napi/index.d.cts

@@ -844,4 +844,3 @@ export declare namespace xxh3 {
   export function xxh128(input: Buffer): bigint
   export function xxh3_64(input: Buffer): bigint
 }
-