diff --git a/package.json b/package.json
index 9746a1a..a21a688 100644
--- a/package.json
+++ b/package.json
@@ -153,6 +153,8 @@
     "coc.nvim": "^0.0.80"
   },
   "devDependencies": {
+    "@commitlint/cli": "^13.1.0",
+    "@commitlint/config-conventional": "^13.1.0",
     "@luma-dev/eslint-config-base": "^0.5.0",
     "@luma-dev/eslint-config-jest": "^0.2.3",
     "@luma-dev/prettier-config": "^0.1.0",
@@ -167,6 +169,7 @@
     "@types/jest": "^27.0.1",
     "@types/node": "10.12.0",
     "better-typescript-lib": "^1.1.0",
+    "commitlint": "^13.1.0",
     "deep-equal": "^2.0.5",
     "esbuild": "^0.12.28",
     "esbuild-node-externals": "^1.3.0",
@@ -174,9 +177,6 @@
     "husky": "^7.0.2",
     "jest": "^27.2.0",
     "npm-run-all": "^4.1.5",
-    "@commitlint/cli": "^13.1.0",
-    "@commitlint/config-conventional": "^13.1.0",
-    "commitlint": "^13.1.0",
     "onchange": "^7.1.0",
     "prettier": "^2.4.0",
     "semantic-release": "^17.4.7",
diff --git a/src/entrypoints/coc.ts b/src/entrypoints/coc.ts
index 48df7ab..c536981 100644
--- a/src/entrypoints/coc.ts
+++ b/src/entrypoints/coc.ts
@@ -1,7 +1,6 @@
 /* eslint-disable import/prefer-default-export */
 import type { ExtensionContext } from 'coc.nvim';
 import { workspace, commands } from 'coc.nvim';
-import assert from 'assert';
 import { autoInitializeWorkspace, manualInitializeWorkspace } from '../commands';
 import { EXTENSION_NS, getSettings } from '../settings';
 
@@ -21,7 +20,7 @@ const initialize = async (_context: ExtensionContext): Promise<void> => {
 export const activate = async (context: ExtensionContext): Promise<void> => {
   // Setup vim runtime settings as vim plugin.
   const rtp = await workspace.nvim.getOption('runtimepath');
-  assert(typeof rtp === 'string');
+  if (typeof rtp !== 'string') throw new Error('[coc-tsdetect] Failed to get runtimepath.');
   const paths = rtp.split(',');
   if (!paths.includes(context.extensionPath)) {
     await workspace.nvim.command(`execute 'noautocmd set runtimepath^='.fnameescape('${context.extensionPath}')`);
diff --git a/src/settings.ts b/src/settings.ts
index 480eec5..3d32db7 100644
--- a/src/settings.ts
+++ b/src/settings.ts
@@ -1,5 +1,4 @@
 import { workspace } from 'coc.nvim';
-import assert from 'assert';
 
 export const EXTENSION_NS = 'tsdetect';
 
@@ -23,8 +22,9 @@ export const getSettings = (): Settings => {
   const result: any = Object.create(null);
   settingsKeys.forEach((key) => {
     const value = settings.inspect(key);
-    assert(value);
-    result[key] = value.workspaceValue ?? value.globalValue ?? value.defaultValue;
+    if (value) {
+      result[key] = value.workspaceValue ?? value.globalValue ?? value.defaultValue;
+    }
   });
   // eslint-disable-next-line @typescript-eslint/no-unsafe-return
   return result;