diff --git a/.github/workflows/auto-merge.yaml b/.github/workflows/auto-merge.yaml
index daefa90..e9e8b29 100644
--- a/.github/workflows/auto-merge.yaml
+++ b/.github/workflows/auto-merge.yaml
@@ -15,7 +15,7 @@ jobs:
         id: metadata
         uses: dependabot/fetch-metadata@v2
         with:
-          github-token: "${{ secrets.GITHUB_TOKEN }}"
+          github-token: '${{ secrets.GITHUB_TOKEN }}'
       - name: Approve a PR
         run: gh pr review --approve "$PR_URL"
         env:
diff --git a/src/index.ts b/src/index.ts
index 9f809fb..951ee50 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,17 +1,16 @@
 import pluginUtils from '@rollup/pluginutils';
 import fs from 'fs';
-import { ExistingRawSourceMap, Plugin } from 'rollup';
+import { ExistingRawSourceMap, Plugin, PluginContext } from 'rollup';
 import { promisify } from 'util';
 import { resolveSourceMap, resolveSources } from './source-map-resolve';
 import { SourcemapsPluginOptions } from './types';
 
 const { createFilter } = pluginUtils;
 
-export default function sourcemaps({
-  include,
-  exclude,
-  readFile = fs.readFile,
-}: SourcemapsPluginOptions = {}): Plugin {
+export default function sourcemaps(
+  // eslint-disable-next-line @typescript-eslint/unbound-method
+  { include, exclude, readFile = fs.readFile }: SourcemapsPluginOptions = {},
+): Plugin {
   // Create a filter function based on the include and exclude options
   const filter = createFilter(include, exclude);
 
@@ -21,7 +20,7 @@ export default function sourcemaps({
   return {
     name: 'sourcemaps',
 
-    async load(id: string) {
+    load: async function (this: PluginContext, id: string) {
       let code: string;
       // If the id does not pass the filter, return null
       if (!filter(id)) {
@@ -66,7 +65,7 @@ export default function sourcemaps({
           const { sourcesContent } = await resolveSources(map, id, promisifiedReadFile);
           // If all sources are strings, assign them to map.sourcesContent
           if (sourcesContent.every(item => typeof item === 'string')) {
-            map.sourcesContent = sourcesContent as string[];
+            map.sourcesContent = sourcesContent;
           }
         } catch {
           // If resolving the sources fails, warn