diff --git a/cli/src/build.ts b/cli/src/build.ts
index 02268fa7..052623e7 100644
--- a/cli/src/build.ts
+++ b/cli/src/build.ts
@@ -121,6 +121,12 @@ export class BuildCommand extends Command {
     )} file, relative to cwd`,
   })
 
+  constEnum?: boolean = Option.Boolean('--const-enum', true, {
+    description: `Generate ${chalk.green(
+      'const enum',
+    )} in .d.ts file or not, default is ${chalk.green('true')}`,
+  })
+
   noDtsHeader = Option.Boolean('--no-dts-header', false, {
     description: `Don't generate ${chalk.green('.d.ts')} header`,
   })
@@ -440,7 +446,12 @@ export class BuildCommand extends Command {
       })
     }
 
-    const { binaryName, packageName } = getNapiConfig(this.configFileName)
+    const {
+      binaryName,
+      packageName,
+      tsConstEnum: tsConstEnumFromConfig,
+    } = getNapiConfig(this.configFileName)
+    const tsConstEnum = this.constEnum ?? tsConstEnumFromConfig
     let cargoArtifactName = this.cargoName
     if (!cargoArtifactName) {
       if (this.bin) {
@@ -617,6 +628,7 @@ export class BuildCommand extends Command {
         intermediateTypeFile,
         dtsFilePath,
         this.noDtsHeader,
+        tsConstEnum,
       )
       await writeJsBinding(
         binaryName,
@@ -666,6 +678,7 @@ async function processIntermediateTypeFile(
   source: string,
   target: string,
   noDtsHeader: boolean,
+  tsConstEnum: boolean,
 ): Promise<string[]> {
   const idents: string[] = []
   if (!existsSync(source)) {
@@ -724,9 +737,12 @@ async function processIntermediateTypeFile(
           if (!nested) {
             idents.push(def.name)
           }
+          const enumPrefix = tsConstEnum ? ' const' : ''
           dts +=
-            indentLines(`${def.js_doc}export const enum ${def.name} {`, nest) +
-            '\n'
+            indentLines(
+              `${def.js_doc}export${enumPrefix} enum ${def.name} {`,
+              nest,
+            ) + '\n'
           dts += indentLines(def.def, nest + 2) + '\n'
           dts += indentLines(`}`, nest) + '\n'
           break
diff --git a/cli/src/consts.ts b/cli/src/consts.ts
index 646cef3c..c4d03303 100644
--- a/cli/src/consts.ts
+++ b/cli/src/consts.ts
@@ -15,6 +15,7 @@ export function getNapiConfig(
   ).map(parseTriple)
   const defaultPlatforms =
     napi?.triples?.defaults === false ? [] : [...DefaultPlatforms]
+  const tsConstEnum: boolean = napi?.ts?.constEnum ?? true
   const platforms = [...defaultPlatforms, ...additionPlatforms]
   const releaseVersion = process.env.RELEASE_VERSION
   const releaseVersionWithoutPrefix = releaseVersion?.startsWith('v')
@@ -34,5 +35,6 @@ export function getNapiConfig(
     packageJsonPath,
     content: pkgJson,
     npmClient,
+    tsConstEnum,
   }
 }
diff --git a/examples/napi/src/threadsafe_function.rs b/examples/napi/src/threadsafe_function.rs
index f4adcf50..d54ee7b6 100644
--- a/examples/napi/src/threadsafe_function.rs
+++ b/examples/napi/src/threadsafe_function.rs
@@ -137,7 +137,6 @@ pub async fn tsfn_return_promise(func: ThreadsafeFunction<u32>) -> Result<u32> {
 pub async fn tsfn_return_promise_timeout(func: ThreadsafeFunction<u32>) -> Result<u32> {
   use tokio::time::{self, Duration};
   let promise = func.call_async::<Promise<u32>>(Ok(1)).await?;
-  let sleep = time::sleep(Duration::from_millis(100));
   let sleep = time::sleep(Duration::from_nanos(1));
   tokio::select! {
     _ = sleep => {