Update the readme to be accurate

.gitattributes

@@ -0,0 +1,2 @@
+tests/index.html -linguist-detectable
+tests/index.html linguist-vendored

README.md

@@ -1,7 +1,8 @@
 # jsStreams
 
-Go library to communicate with the JS Stream API by bridging the JS ReadableStream object to a Go io.ReaderCloser.
+Go library to communicate with the JS Stream API by bridging the JS ReadableStream and WritableStream objects to a Go io.ReaderCloser and io.WriterCloser.
+It also works vice versa, and with pipe readers/writers.
 
 [![Go Report Card](https://goreportcard.com/badge/git.ailur.dev/ailur/jsStreams)](https://goreportcard.com/report/git.ailur.dev/ailur/jsStreams) [![Go Reference](https://pkg.go.dev/badge/git.ailur.dev/ailur/jsStreams.svg)](https://pkg.go.dev/git.ailur.dev/ailur/jsStreams)
 
-The API is pretty self-explanatory - it provides a function to create an io.ReaderCloser from a JS ReadableStream object.
+The API is pretty self-explanatory, see the Go Reference badge above for the full documentation.

main.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"strings"
 	"sync"
 
 	"syscall/js"
@@ -18,8 +19,8 @@ type ReadableStream struct {
 // Read reads up to len(p) bytes into p. It returns the number of bytes read (0 <= n <= len(p)) and any error encountered.
 // This implementation of Read does not use scratch space if n < len(p). If some data is available but not len(p) bytes,
 // Read conventionally returns what is available instead of waiting for more. Note: Read will block until data is available,
-// meaning in a WASM environment, you **must** use a goroutine to call Read.
-func (r *ReadableStream) Read(inputBytes []byte) (n int, err error) {
+// meaning in a WASM environment, you must use a goroutine to call Read.
+func (r *ReadableStream) Read(p []byte) (n int, err error) {
 	defer func() {
 		recovered := recover()
 		if recovered != nil {
@@ -33,16 +34,17 @@ func (r *ReadableStream) Read(inputBytes []byte) (n int, err error) {
 
 	reader := r.stream.Call("getReader", map[string]interface{}{"mode": "byob"})
 
-	resultBuffer := js.Global().Get("Uint8Array").New(len(inputBytes))
+	resultBuffer := js.Global().Get("Uint8Array").New(len(p))
 	readResult := reader.Call("read", resultBuffer)
 
 	readResult.Call("then", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
 		defer waitGroup.Done()
-		data := args[0].Get("value")
-		js.CopyBytesToGo(inputBytes, data)
-		if args[0].Get("done").Bool() {
+		if args[0].Get("done").Bool() || args[0].Get("value").Length() == 0 {
 			err = io.EOF
+			return nil
 		}
+		data := args[0].Get("value")
+		js.CopyBytesToGo(p, data)
 		n = data.Length()
 		return nil
 	}))
@@ -61,13 +63,14 @@ func (r *ReadableStream) Read(inputBytes []byte) (n int, err error) {
 }
 
 // Close closes the ReadableStream. If the stream is already closed, Close does nothing.
-// If the stream is not yet closed, it is canceled. The reader is closed and the underlying source or pipeline is terminated.
-// This method is idempotent, meaning that it can be called multiple times without causing an error.
 func (r *ReadableStream) Close() (err error) {
 	defer func() {
-		recovered := recover()
-		if recovered != nil {
-			err = fmt.Errorf("panic: %v", recovered)
+		// We don't want any errors to be thrown if the stream is already closed.
+		recovery := recover()
+		if !strings.Contains(fmt.Sprint(recovery), "Can not close stream after closing or error") {
+			if recovery != nil {
+				err = fmt.Errorf("panic: %v", recovery)
+			}
 		}
 	}()
 
@@ -82,11 +85,15 @@ func NewReadableStream(stream js.Value) *ReadableStream {
 	return &ReadableStream{stream: stream}
 }
 
+// WritableStream implements io.WriteCloser for a JavaScript WritableStream.
 type WritableStream struct {
 	stream js.Value
 	lock   sync.Mutex
 }
 
+// Write writes len(p) bytes from p to the underlying data stream. It returns the number of bytes written from p (0 <= n <= len(p))
+// and any error encountered that caused the write to stop early. Write must return a non-nil error if it returns n < len(p).
+// Write must not modify the slice data, even temporarily.
 func (w *WritableStream) Write(p []byte) (n int, err error) {
 	defer func() {
 		recovered := recover()
@@ -131,11 +138,15 @@ func (w *WritableStream) Write(p []byte) (n int, err error) {
 	return n, err
 }
 
+// Close closes the WritableStream. If the stream is already closed, Close does nothing.
 func (w *WritableStream) Close() (err error) {
 	defer func() {
-		recovered := recover()
-		if recovered != nil {
-			err = fmt.Errorf("panic: %v", recovered)
+		// We don't want any errors to be thrown if the stream is already closed.
+		recovery := recover()
+		if !strings.Contains(fmt.Sprint(recovery), "Can not close stream after closing or error") {
+			if recovery != nil {
+				err = fmt.Errorf("panic: %v", recovery)
+			}
 		}
 	}()
 
@@ -156,3 +167,51 @@ func NewWritableStream(stream ...js.Value) *WritableStream {
 		return &WritableStream{stream: stream}
 	}
 }
+
+// Now we do the vice versa: Reader to ReadableStream and Writer to WritableStream.
+
+// ReaderToReadableStream converts an io.Reader to a JavaScript ReadableStream.
+func ReaderToReadableStream(r io.Reader) js.Value {
+	return js.Global().Get("ReadableStream").New(map[string]interface{}{
+		"pull": js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+			readController := args[0]
+			return js.Global().Get("Promise").New(js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+				var buffer []byte
+				buffer, err := io.ReadAll(r)
+				if err != nil {
+					panic(err.Error())
+				}
+				if len(buffer) == 0 {
+					readController.Call("close")
+					return nil
+				}
+				jsBuffer := js.Global().Get("Uint8Array").New(len(buffer))
+				js.CopyBytesToJS(jsBuffer, buffer)
+				readController.Call("enqueue", jsBuffer)
+				readController.Call("close")
+				args[0].Invoke()
+				return nil
+			}))
+		}),
+		"type": "bytes",
+	})
+}
+
+// WriterToWritableStream converts an io.Writer to a JavaScript WritableStream.
+func WriterToWritableStream(w io.Writer) js.Value {
+	return js.Global().Get("WritableStream").New(map[string]interface{}{
+		"write": js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+			writeBuffer := args[0]
+			return js.Global().Get("Promise").New(js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+				buffer := make([]byte, writeBuffer.Length())
+				js.CopyBytesToGo(buffer, writeBuffer)
+				_, err := w.Write(buffer)
+				if err != nil {
+					panic(err.Error())
+				}
+				args[0].Invoke()
+				return nil
+			}))
+		}),
+	})
+}

tests/main.go

@@ -1,11 +1,9 @@
 package main
 
 import (
-	"git.ailur.dev/ailur/jsStreams"
-
 	"fmt"
+	"git.ailur.dev/ailur/jsStreams"
 	"io"
-
 	"syscall/js"
 )
 
@@ -23,6 +21,10 @@ func main() {
 				return
 			}
 			fmt.Println(string(buffer))
+			err = readStream.Close()
+			if err != nil {
+				fmt.Println(err)
+			}
 		}()
 
 		return nil
@@ -36,6 +38,62 @@ func main() {
 				fmt.Println(err)
 				return
 			}
+			err = writeStream.Close()
+			if err != nil {
+				fmt.Println(err)
+			}
+		}()
+
+		return nil
+	}))
+
+	js.Global().Set("TryWriterConversions", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+		go func() {
+			reader, writer := io.Pipe()
+			go func() {
+				writeStream := jsStreams.WriterToWritableStream(writer)
+				buffer := js.Global().Get("Uint8Array").New(45)
+				js.CopyBytesToJS(buffer, []byte("Hi, I've been piped through a WritableStream!"))
+				writeStream.Call("getWriter").Call("write", buffer).Call("then", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+					go func() {
+						err := writer.Close()
+						if err != nil {
+							fmt.Println(err)
+						}
+					}()
+					return nil
+				}))
+			}()
+			go func() {
+				fmt.Println("Reading stream...")
+				m, _ := io.ReadAll(reader)
+				fmt.Println(string(m))
+			}()
+		}()
+
+		return nil
+	}))
+
+	js.Global().Set("TryReaderConversions", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+		go func() {
+			reader, writer := io.Pipe()
+			go func() {
+				_, err := writer.Write([]byte("Hi, I've been piped through a ReadableStream!"))
+				if err != nil {
+					fmt.Println(err)
+					return
+				}
+				err = writer.Close()
+				if err != nil {
+					fmt.Println(err)
+					return
+				}
+			}()
+			go func() {
+				fmt.Println("Reading stream...")
+				m, _ := io.ReadAll(jsStreams.NewReadableStream(jsStreams.ReaderToReadableStream(reader)))
+				fmt.Println(string(m))
+			}()
 		}()
 
 		return nil