diff --git a/stream.ts b/stream.ts
new file mode 100644
index 0000000..8be6956
--- /dev/null
+++ b/stream.ts
@@ -0,0 +1,55 @@
+import type {
+  Closer,
+  Reader,
+  ReaderSync,
+  Writer,
+  WriterSync,
+} from "https://deno.land/std@0.115.1/io/types.d.ts";
+
+// size_t ZSTD_CStreamInSize(void);    /**< recommended size for input buffer */
+// size_t ZSTD_CStreamOutSize(void);   /**< recommended size for output buffer. Guarantee to successfully flush at least one complete compressed block. */
+// size_t ZSTD_DStreamInSize(void);    /*!< recommended size for input buffer */
+// size_t ZSTD_DStreamOutSize(void);   /*!< recommended size for output buffer. Guarantee to successfully flush at least one complete block in all circumstances. */
+
+export class ZstdCompressor implements Writer, WriterSync, Closer {
+  constructor(buffer: ArrayBuffer, level: number = 3) {
+    // const ctx = ZSTD_createCStream();
+    // // note : since v1.3.0, ZSTD_CStream and ZSTD_CCtx are the same thing.
+    // // size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param, int value);
+    // if (isError(ZSTD_CCtx_setParameter(ctx, ZSTD_c_compressionLevel, ${level}))) {
+    //   throw new Error(...);
+    // }
+  }
+
+  async write(p: Uint8Array): Promise<number> {
+    const res = this.writeSync(p);
+    return Promise.resolve(res);
+  }
+
+  writeSync(p: Uint8Array): number {
+    return 0;
+  }
+
+  close(): void {
+    // ZSTD_freeCStream(ctx);
+  }
+}
+
+export class ZstdDeompressor implements Reader, ReaderSync, Closer {
+  constructor(buffer: ArrayBuffer) {
+    // const ctx = ZSTD_createDStream();
+  }
+
+  async read(p: Uint8Array): Promise<number | null> {
+    const res = this.readSync(p);
+    return Promise.resolve(res);
+  }
+
+  readSync(p: Uint8Array): number | null {
+    return 0;
+  }
+
+  close(): void {
+    // ZSTD_freeDStream(this.ctx);
+  }
+}
diff --git a/zstd.ts b/zstd.ts
index b092f17..084300d 100644
--- a/zstd.ts
+++ b/zstd.ts
@@ -108,3 +108,13 @@ export function decompress(
     module["_free"](heap, size);
   }
 }
+
+export function minCompressLevel(): number {
+  //int         ZSTD_minCLevel(void);               /*!< minimum negative compression level allowed */
+  return 0;
+}
+
+export function maxCompressLevel(): number {
+  //int         ZSTD_maxCLevel(void);               /*!< maximum compression level available */
+  return 0;
+}