diff --git a/package.json b/package.json
index fdd234c..4e67d3a 100644
--- a/package.json
+++ b/package.json
@@ -84,10 +84,6 @@
     "typescript": "^5.0.2",
     "vitest": "^1.6.0"
   },
-  "dependencies": {
-    "detect-indent": "^6.1.0",
-    "strip-indent": "^3.0.0"
-  },
   "peerDependencies": {
     "@babel/core": "^7.10.2",
     "coffeescript": "^2.5.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index f5c1446..aab9c16 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -7,13 +7,6 @@ settings:
 importers:
 
   .:
-    dependencies:
-      detect-indent:
-        specifier: ^6.1.0
-        version: 6.1.0
-      strip-indent:
-        specifier: ^3.0.0
-        version: 3.0.0
     devDependencies:
       '@babel/core':
         specifier: ^7.23.6
@@ -1974,10 +1967,6 @@ packages:
     resolution: {integrity: sha512-0je+qPKHEMohvfRTCEo3CrPG6cAzAYgmzKyxRiYSSDkS6eGJdyVJm7WaYA5ECaAD9wLB2T4EEeymA5aFVcYXCA==}
     engines: {node: '>=6'}
 
-  detect-indent@6.1.0:
-    resolution: {integrity: sha512-reYkTUJAZb9gUuZ2RvVCNhVHdg62RHnJ7WJl8ftMi4diZ6NWlciOzQN88pUhSELEwflJht4oQDv0F0BMlwaYtA==}
-    engines: {node: '>=8'}
-
   detect-newline@3.1.0:
     resolution: {integrity: sha512-TLz+x/vEXm/Y7P7wn1EJFNLxYpUD4TgMosxY6fAVJUnJMbupHBOncxyWUG9OpTaH9EBD7uFI5LfEgmMOc54DsA==}
     engines: {node: '>=8'}
@@ -6564,8 +6553,6 @@ snapshots:
 
   dequal@2.0.3: {}
 
-  detect-indent@6.1.0: {}
-
   detect-newline@3.1.0:
     optional: true
 
diff --git a/src/modules/prepareContent.ts b/src/modules/prepareContent.ts
index b296edb..5dadf5d 100644
--- a/src/modules/prepareContent.ts
+++ b/src/modules/prepareContent.ts
@@ -1,6 +1,4 @@
-import stripIndent from 'strip-indent';
-
-// todo: could use magig-string and generate some sourcemaps 🗺
+// todo: could use magic-string and generate some sourcemaps 🗺
 export function prepareContent({
   options,
   content,
@@ -22,3 +20,27 @@ export function prepareContent({
 
   return content;
 }
+
+/** Get the shortest leading whitespace from lines in a string */
+function minIndent(s: string) {
+  const match = s.match(/^[ \t]*(?=\S)/gm);
+
+  if (!match) {
+    return 0;
+  }
+
+  return match.reduce((r, a) => Math.min(r, a.length), Infinity);
+}
+
+/** Strip leading whitespace from each line in a string */
+function stripIndent(s: string) {
+  const indent = minIndent(s);
+
+  if (indent === 0) {
+    return s;
+  }
+
+  const regex = new RegExp(`^[ \\t]{${indent}}`, 'gm');
+
+  return s.replace(regex, '');
+}
diff --git a/src/transformers/pug.ts b/src/transformers/pug.ts
index b02192b..dfad060 100644
--- a/src/transformers/pug.ts
+++ b/src/transformers/pug.ts
@@ -1,4 +1,3 @@
-import detectIndent from 'detect-indent';
 import pug from 'pug';
 
 import type { Transformer, Options } from '../types';
@@ -67,8 +66,8 @@ const transformer: Transformer<Options.Pug> = async ({
     ...options,
   };
 
-  const { type: indentationType } = detectIndent(content);
-  const input = `${GET_MIXINS(indentationType ?? 'space')}\n${content}`;
+  const spaces = guessIndentString(content);
+  const input = `${GET_MIXINS(spaces ? 'space' : 'tab')}\n${content}`;
   const compiled = pug.compile(
     input,
     pugOptions,
@@ -94,4 +93,41 @@ const transformer: Transformer<Options.Pug> = async ({
   };
 };
 
+// Sourced from `golden-fleece`
+// https://github.com/Rich-Harris/golden-fleece/blob/f2446f331640f325e13609ed99b74b6a45e755c2/src/patch.ts#L302
+function guessIndentString(str: string): number | undefined {
+  const lines = str.split('\n');
+
+  let tabs = 0;
+  let spaces = 0;
+  let minSpaces = 8;
+
+  lines.forEach((line) => {
+    const match = /^(?: +|\t+)/.exec(line);
+
+    if (!match) return;
+
+    const [whitespace] = match;
+
+    if (whitespace.length === line.length) return;
+
+    if (whitespace[0] === '\t') {
+      tabs += 1;
+    } else {
+      spaces += 1;
+      if (whitespace.length > 1 && whitespace.length < minSpaces) {
+        minSpaces = whitespace.length;
+      }
+    }
+  });
+
+  if (spaces > tabs) {
+    let result = '';
+
+    while (minSpaces--) result += ' ';
+
+    return result.length;
+  }
+}
+
 export { transformer };
diff --git a/src/types/modules.d.ts b/src/types/modules.d.ts
index e762681..6b524a7 100644
--- a/src/types/modules.d.ts
+++ b/src/types/modules.d.ts
@@ -1,6 +1,5 @@
 declare module 'svelte/package.json';
 declare module 'coffeescript';
-declare module 'strip-indent';
 declare module 'postcss-load-config';
 declare module 'less';
 declare module 'sorcery';