feat: add toString

src/toString.js

@@ -0,0 +1,25 @@
+import { Buffer } from "buffer";
+
+import { isString } from "lodash-es";
+
+import { isStream } from "./isStream.js";
+
+const { isBuffer } = Buffer;
+
+export async function toString(value, charset = "utf8") {
+  if (isString(value)) {
+    return value;
+  }
+  if (isBuffer(value)) {
+    return value.toString(charset);
+  }
+  if (isStream(value)) {
+    const bufferList = [];
+    return new Promise((resolve, reject) => {
+      value
+        .on("data", (data) => bufferList.push(Buffer.from(data)))
+        .on("error", (error) => reject(error))
+        .on("end", () => resolve(Buffer.concat(bufferList).toString(charset)));
+    });
+  }
+}