diff --git a/src/autoProcess.ts b/src/autoProcess.ts
index ef2e5ae4..7917eacb 100644
--- a/src/autoProcess.ts
+++ b/src/autoProcess.ts
@@ -7,7 +7,7 @@ import type {
   Transformers,
   Options,
 } from './types';
-import { hasDepInstalled, concat } from './modules/utils';
+import { hasDepInstalled, concat, setProp } from './modules/utils';
 import { getTagInfo } from './modules/tagInfo';
 import {
   addLanguageAlias,
@@ -127,9 +127,7 @@ export function sveltePreprocess(
     }
 
     if (sourceMap && name in SOURCE_MAP_PROP_MAP) {
-      const [propName, value] = SOURCE_MAP_PROP_MAP[name];
-
-      opts[propName] = value;
+      setProp(opts, ...SOURCE_MAP_PROP_MAP[name]);
     }
 
     return opts;
diff --git a/src/modules/language.ts b/src/modules/language.ts
index ae1fbe35..255a160d 100644
--- a/src/modules/language.ts
+++ b/src/modules/language.ts
@@ -36,15 +36,15 @@ export function getLanguageDefaults(lang: string): null | Record<string, any> {
   return defaults;
 }
 
-export const SOURCE_MAP_PROP_MAP: Record<string, [string, any]> = {
-  babel: ['sourceMaps', true],
-  typescript: ['sourceMap', true],
-  scss: ['sourceMap', true],
-  less: ['sourceMap', {}],
-  stylus: ['sourcemap', true],
-  postcss: ['map', true],
-  coffeescript: ['sourceMap', true],
-  globalStyle: ['sourceMap', true],
+export const SOURCE_MAP_PROP_MAP: Record<string, [string[], any]> = {
+  babel: [['sourceMaps'], true],
+  typescript: [['compilerOptions', 'sourceMap'], true],
+  scss: [['sourceMap'], true],
+  less: [['sourceMap'], {}],
+  stylus: [['sourcemap'], true],
+  postcss: [['map'], true],
+  coffeescript: [['sourceMap'], true],
+  globalStyle: [['sourceMap'], true],
 };
 
 export const ALIAS_MAP = new Map([
diff --git a/src/modules/utils.ts b/src/modules/utils.ts
index 41184f92..58f50b52 100644
--- a/src/modules/utils.ts
+++ b/src/modules/utils.ts
@@ -90,3 +90,20 @@ export function findUp({ what, from }) {
 
   return null;
 }
+
+// set deep property in object
+export function setProp(obj, keyList, val) {
+  let i = 0;
+
+  for (; i < keyList.length - 1; i++) {
+    const key = keyList[i];
+
+    if (typeof obj[key] !== 'object') {
+      obj[key] = {};
+    }
+
+    obj = obj[key];
+  }
+
+  obj[keyList[i]] = val;
+}
diff --git a/test/autoProcess/sourceMaps.test.ts b/test/autoProcess/sourceMaps.test.ts
index e24b1ba1..ff49e7d4 100644
--- a/test/autoProcess/sourceMaps.test.ts
+++ b/test/autoProcess/sourceMaps.test.ts
@@ -9,6 +9,7 @@ import { transformer as scssTransformer } from '../../src/transformers/scss';
 import { transformer as stylusTransformer } from '../../src/transformers/stylus';
 import { transformer as typescriptTransformer } from '../../src/transformers/typescript';
 import { SOURCE_MAP_PROP_MAP } from '../../src/modules/language';
+import { setProp } from '../../src/modules/utils';
 
 const TRANSFORMERS: Record<string, any> = {
   babel: {
@@ -84,13 +85,15 @@ describe(`sourcemap generation`, () => {
           [transformerName]: true,
         });
 
-        const [key, val] = SOURCE_MAP_PROP_MAP[transformerName];
+        const expectedOptions = {};
+
+        setProp(expectedOptions, ...SOURCE_MAP_PROP_MAP[transformerName]);
 
         await preprocess(template, opts);
 
         expect(transformer).toHaveBeenCalledWith(
           expect.objectContaining({
-            options: expect.objectContaining({ [key]: val }),
+            options: expect.objectContaining(expectedOptions),
           }),
         );
       });