diff --git a/docs/markdown-scripts.md b/docs/markdown-scripts.md
index 3dfb11f09a..a87fcdad1f 100644
--- a/docs/markdown-scripts.md
+++ b/docs/markdown-scripts.md
@@ -14,6 +14,10 @@ await $`whoami`
 await $`echo ${__dirname}`
 ```
 
+```ts
+await $`pwd`
+```
+
 The `__filename` will be pointed to **markdown.md**:
 
 ```js
diff --git a/src/cli.ts b/src/cli.ts
index d2be0bf8e0..6ad9384080 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -172,7 +172,7 @@ export async function writeAndImport(
   filepath: string,
   origin = filepath
 ) {
-  await fs.writeFile(filepath, script.toString())
+  await fs.writeFile(filepath, script)
   try {
     process.once('exit', () => fs.rmSync(filepath, { force: true }))
     await importPath(filepath, origin)
@@ -185,21 +185,18 @@ export async function importPath(
   filepath: string,
   origin = filepath
 ): Promise<void> {
+  const contents = await fs.readFile(filepath)
   const { ext, base, dir } = path.parse(filepath)
   const tempFilename = getFilepath(dir, base)
 
   if (ext === '') {
-    return writeAndImport(await fs.readFile(filepath), tempFilename, origin)
+    return writeAndImport(contents, tempFilename, origin)
   }
   if (ext === '.md') {
-    return writeAndImport(
-      transformMarkdown(await fs.readFile(filepath)),
-      tempFilename,
-      origin
-    )
+    return writeAndImport(transformMarkdown(contents), tempFilename, origin)
   }
   if (argv.install) {
-    const deps = parseDeps(await fs.readFile(filepath))
+    const deps = parseDeps(contents)
     await installDeps(deps, dir, argv.registry)
   }
 
@@ -215,13 +212,13 @@ export function injectGlobalRequire(origin: string) {
   Object.assign(globalThis, { __filename, __dirname, require })
 }
 
-export function transformMarkdown(buf: Buffer): string {
+export function transformMarkdown(buf: Buffer | string): string {
   const source = buf.toString()
   const output = []
   let state = 'root'
   let codeBlockEnd = ''
   let prevLineIsEmpty = true
-  const jsCodeBlock = /^(```{1,20}|~~~{1,20})(js|javascript)$/
+  const jsCodeBlock = /^(```{1,20}|~~~{1,20})(js|javascript|ts|typescript)$/
   const shCodeBlock = /^(```{1,20}|~~~{1,20})(sh|shell|bash)$/
   const otherCodeBlock = /^(```{1,20}|~~~{1,20})(.*)$/
   for (const line of source.split(/\r?\n/)) {
diff --git a/src/deps.ts b/src/deps.ts
index 3691babc2a..5d02447a20 100644
--- a/src/deps.ts
+++ b/src/deps.ts
@@ -102,7 +102,7 @@ const nameRe =
   /^(?<name>(@[a-z0-9-~][a-z0-9-._~]*\/)?[a-z0-9-~][a-z0-9-._~]*)\/?.*$/i
 const versionRe = /^@(?<version>[~^]?(v?[\dx*]+([-.][\d*a-z-]+)*))/i
 
-export function parseDeps(content: Buffer): Record<string, string> {
+export function parseDeps(content: Buffer | string): Record<string, string> {
   return depseek(content.toString() + '\n', { comments: true }).reduce<
     Record<string, string>
   >((m, { type, value }, i, list) => {