diff --git a/libraries/deno-ai-mod.ts b/libraries/deno-ai-mod.ts
index 9494f27..12a4115 100644
--- a/libraries/deno-ai-mod.ts
+++ b/libraries/deno-ai-mod.ts
@@ -5,7 +5,7 @@ import {
     term,
 } from "https://script.hatter.ink/@71/deno-commons-mod.ts";
 
-export async function howto(message: string): Promise<string> {
+export async function howto(message: string): Promise<string | null> {
     const response = await fetchDataWithTimeout(
         "https://hatter.ink/ai/command-line-howto.json",
         {
diff --git a/libraries/deno-commons-mod.ts b/libraries/deno-commons-mod.ts
index 1de6b34..74b6f4c 100644
--- a/libraries/deno-commons-mod.ts
+++ b/libraries/deno-commons-mod.ts
@@ -35,7 +35,7 @@ export function stdin(): ReadableStream {
     return isDeno() ? Deno.stdin.readable : process.stdin;
 }
 
-function streamToArrayBuffer(stream) {
+function streamToArrayBuffer(stream): Promise<ArrayBuffer> {
     const chunks = [];
     return new Promise((resolve, reject) => {
         stream.on("error", (err) => reject(err));
@@ -291,15 +291,15 @@ export function formatHumanTime2(timeMillis: number): string {
     if (timeMinutes < 60) {
         return `${timeMinutes} minutes`;
     }
-    const timeHours = timeMinutes / 60;
+    const timeHours = Math.floor(timeMinutes / 60);
     if (timeHours < 24) {
         return `${formatNumber(timeHours)} hours`;
     }
-    const timeDays = timeHours / 24;
+    const timeDays = Math.floor(timeHours / 24);
     if (timeDays < 365) {
         return `${formatNumber(timeDays)} days`;
     }
-    const timeYears = timeDays / 365;
+    const timeYears = Math.floor(timeDays / 365);
     return `${formatNumber(timeYears)} years`;
 }
 
@@ -588,7 +588,7 @@ function __getColorCode(color: string): string {
     return COLOR_MAP[color];
 }
 
-function renderColorTokens(tokens: ColorToken[], renderColor: bool): string {
+function renderColorTokens(tokens: ColorToken[], renderColor: boolean): string {
     const text: string[] = [];
     const colorMapStack = new Map<string, number[]>();
     for (const token of tokens) {
@@ -849,7 +849,7 @@ function __isDenoNotFound(e) {
 }
 
 function __isNodeNotFound(e) {
-    return (e.errno ?? 0 === -2) && e.message &&
+    return ((e.errno ?? 0) === -2) && e.message &&
         e.message.includes("no such file or directory");
 }
 
@@ -924,7 +924,7 @@ export async function writeStringToFile(
 
 export async function removePath(path: string): Promise<void> {
     if (isDeno()) {
-        await Deno.remove(newFilename);
+        await Deno.remove(path);
     } else {
         return new Promise((resolve, reject) => {
             rm(path, (err) => {
@@ -964,7 +964,7 @@ export function uint8ArrayToHexString(uint8: Uint8Array): string {
         .join("");
 }
 
-export function uint8ArrayToBase32String(uint8: Unit8Array): string {
+export function uint8ArrayToBase32String(uint8: Uint8Array): string {
     return encodeBase32(uint8).replaceAll(/=/g, "").toLowerCase();
 }
 
@@ -1523,7 +1523,7 @@ export async function fetchAlibabaCloudInstanceIdentityV1(
         pkcs7Options,
     );
     if (pkcs7Response.status != 200) {
-        throw new Error("Get PKCS#7 failed: ${pkcs7Response.status}`)");
+        throw new Error(`Get PKCS#7 failed: ${pkcs7Response.status}`);
     }
     return await pkcs7Response.text();
 }
@@ -1636,7 +1636,7 @@ export interface GetSecretValueOptions {
     maxCacheTimeSecs?: number;
 }
 
-export function getRunEnv(): stirng | null {
+export function getRunEnv(): string | null {
     return getEnv("RUN_ENV");
 }