diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index b8c52e7..1d8a802 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -8,7 +8,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build
       run: docker build -t hackpad .
     - name: Publish
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e867bc4..780652c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,19 +9,19 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-go@v2
+    - uses: actions/checkout@v3
+    - uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.20.x
     - name: Lint
       run: make lint
 
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-go@v2
+    - uses: actions/checkout@v3
+    - uses: actions/setup-go@v3
       with:
-        go-version: 1.16
+        go-version: 1.20.x
     - name: Test
       run: make test
diff --git a/Makefile b/Makefile
index 77ce405..dccf283 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,11 @@
 SHELL := /usr/bin/env bash
-GO_VERSION = 1.16.6
+GO_VERSION = 1.20
 GOROOT =
 PATH := ${PWD}/cache/go/bin:${PWD}/cache/go/misc/wasm:${PATH}
 GOOS = js
 GOARCH = wasm
 export
-LINT_VERSION=1.27.0
+LINT_VERSION=1.52.2
 
 .PHONY: serve
 serve:
@@ -71,7 +71,7 @@ cache/go${GO_VERSION}: cache
 		git clone \
 			--depth 1 \
 			--single-branch \
-			--branch hackpad-go${GO_VERSION} \
+			--branch hackpad/release-branch.go${GO_VERSION} \
 			https://github.com/hack-pad/go.git \
 			"$$TMP"; \
 		pushd "$$TMP/src"; \
diff --git a/cmd/editor/css/css.go b/cmd/editor/css/css.go
index 027bf35..c02d6ae 100644
--- a/cmd/editor/css/css.go
+++ b/cmd/editor/css/css.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package css
diff --git a/cmd/editor/dom/document.go b/cmd/editor/dom/document.go
index a2088e6..b03f1a8 100644
--- a/cmd/editor/dom/document.go
+++ b/cmd/editor/dom/document.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package dom
diff --git a/cmd/editor/dom/element.go b/cmd/editor/dom/element.go
index d6f20aa..4727ce8 100644
--- a/cmd/editor/dom/element.go
+++ b/cmd/editor/dom/element.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package dom
@@ -111,14 +112,20 @@ func (e *Element) QuerySelectorAll(query string) []*Element {
 	return sliceFromArray(e.elem.Call("querySelectorAll", query))
 }
 
-func (e *Element) AddEventListener(name string, listener EventListener) {
-	e.elem.Call("addEventListener", name, js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+func (e *Element) RemoveEventListener(name string, listener js.Func) {
+	e.elem.Call("removeEventListener", name, listener)
+}
+
+func (e *Element) AddEventListener(name string, listener EventListener) js.Func {
+	listenerFunc := js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
 		defer common.CatchExceptionHandler(func(err error) {
 			log.Error("recovered from panic: ", err, "\n", string(debug.Stack()))
 		})
 		listener(args[0])
 		return nil
-	}))
+	})
+	e.elem.Call("addEventListener", name, listenerFunc)
+	return listenerFunc
 }
 
 func (e *Element) Focus() {
diff --git a/cmd/editor/dom/rect.go b/cmd/editor/dom/rect.go
index fa01989..2b46c95 100644
--- a/cmd/editor/dom/rect.go
+++ b/cmd/editor/dom/rect.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package dom
diff --git a/cmd/editor/dom/window.go b/cmd/editor/dom/window.go
index 35f92fb..a8a02ec 100644
--- a/cmd/editor/dom/window.go
+++ b/cmd/editor/dom/window.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package dom
diff --git a/cmd/editor/editor.go b/cmd/editor/editor.go
index 1cd268b..857f5bf 100644
--- a/cmd/editor/editor.go
+++ b/cmd/editor/editor.go
@@ -1,9 +1,9 @@
+//go:build js
 // +build js
 
 package main
 
 import (
-	"io/ioutil"
 	"os"
 	"syscall/js"
 
@@ -13,19 +13,20 @@ import (
 )
 
 // editorJSFunc is a JS function that opens on a JS element and returns a JS object with the following spec:
-// {
-//   getContents() string
-//   setContents(string)
-//   getCursorIndex() int
-//   setCursorIndex(int)
-// }
+//
+//	{
+//	  getContents() string
+//	  setContents(string)
+//	  getCursorIndex() int
+//	  setCursorIndex(int)
+//	}
 type editorJSFunc js.Value
 
 func (e editorJSFunc) New(elem *dom.Element) ide.Editor {
 	editor := &jsEditor{
 		titleChan: make(chan string, 1),
 	}
-	editor.elem = js.Value(e).Invoke(elem, js.FuncOf(editor.onEdit))
+	editor.elem = js.Value(e).Invoke(elem.JSValue(), js.FuncOf(editor.onEdit))
 	return editor
 }
 
@@ -43,7 +44,7 @@ func (j *jsEditor) onEdit(js.Value, []js.Value) interface{} {
 		if err == nil {
 			perm = info.Mode()
 		}
-		err = ioutil.WriteFile(j.filePath, []byte(contents), perm)
+		err = os.WriteFile(j.filePath, []byte(contents), perm)
 		if err != nil {
 			log.Error("Failed to write file contents: ", err)
 		}
@@ -62,7 +63,7 @@ func (j *jsEditor) CurrentFile() string {
 }
 
 func (j *jsEditor) ReloadFile() error {
-	contents, err := ioutil.ReadFile(j.filePath)
+	contents, err := os.ReadFile(j.filePath)
 	if err != nil {
 		return err
 	}
diff --git a/cmd/editor/ide/command.go b/cmd/editor/ide/command.go
index 9a182df..bde335d 100644
--- a/cmd/editor/ide/command.go
+++ b/cmd/editor/ide/command.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package ide
@@ -16,15 +17,15 @@ const (
 )
 
 // runGoProcess optimizes runProcess by skipping the wait time for listing PATH directories on startup
-func (w *window) runGoProcess(console TaskConsole, args ...string) promise.Promise {
+func (w *window) runGoProcess(console TaskConsole, args ...string) promise.JS {
 	return w.runRawProcess(console, goBinaryPath, "go", args...)
 }
 
-func (w *window) runProcess(console TaskConsole, name string, args ...string) promise.Promise {
+func (w *window) runProcess(console TaskConsole, name string, args ...string) promise.JS {
 	return w.runRawProcess(console, name, name, args...)
 }
 
-func (w *window) runRawProcess(console TaskConsole, fullPath, name string, args ...string) promise.Promise {
+func (w *window) runRawProcess(console TaskConsole, fullPath, name string, args ...string) promise.JS {
 	resolve, reject, prom := promise.New()
 	go func() {
 		var success bool
@@ -69,6 +70,6 @@ func (w *window) startProcess(console TaskConsole, rawPath, name string, args ..
 
 func (w *window) runPlayground(console TaskConsole) {
 	w.runGoProcess(console, "build", "-v", ".").Then(func(_ interface{}) interface{} {
-		return w.runProcess(console, "./playground")
+		return w.runProcess(console, "./playground").JSValue()
 	})
 }
diff --git a/cmd/editor/ide/console.go b/cmd/editor/ide/console.go
index 53473a3..299ee7f 100644
--- a/cmd/editor/ide/console.go
+++ b/cmd/editor/ide/console.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package ide
diff --git a/cmd/editor/ide/dropdown.go b/cmd/editor/ide/dropdown.go
index 42ea8a7..5848cf1 100644
--- a/cmd/editor/ide/dropdown.go
+++ b/cmd/editor/ide/dropdown.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package ide
@@ -33,7 +34,7 @@ func newDropdown(attachTo, content *dom.Element) *dropdown {
 		attached: attachTo,
 	}
 	dom.GetDocument().AddEventListener("click", func(event js.Value) {
-		if !event.Call("composedPath").Call("includes", drop).Bool() {
+		if !event.Call("composedPath").Call("includes", drop.JSValue()).Bool() {
 			drop.Close()
 		}
 	})
diff --git a/cmd/editor/ide/editor.go b/cmd/editor/ide/editor.go
index e31d680..3fd4ded 100644
--- a/cmd/editor/ide/editor.go
+++ b/cmd/editor/ide/editor.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package ide
diff --git a/cmd/editor/ide/settings.go b/cmd/editor/ide/settings.go
index b979cb1..a1d9045 100644
--- a/cmd/editor/ide/settings.go
+++ b/cmd/editor/ide/settings.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package ide
diff --git a/cmd/editor/ide/tab.go b/cmd/editor/ide/tab.go
index b8eb663..53ce46a 100644
--- a/cmd/editor/ide/tab.go
+++ b/cmd/editor/ide/tab.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package ide
diff --git a/cmd/editor/ide/tab_pane.go b/cmd/editor/ide/tab_pane.go
index bd2e778..0fbfe86 100644
--- a/cmd/editor/ide/tab_pane.go
+++ b/cmd/editor/ide/tab_pane.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package ide
diff --git a/cmd/editor/ide/window.go b/cmd/editor/ide/window.go
index 8d37e06..cadbc9f 100644
--- a/cmd/editor/ide/window.go
+++ b/cmd/editor/ide/window.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package ide
@@ -5,7 +6,7 @@ package ide
 import (
 	_ "embed"
 	"go/format"
-	"io/ioutil"
+	"os"
 	"strings"
 	"syscall/js"
 
@@ -99,7 +100,7 @@ func New(elem *dom.Element, editorBuilder EditorBuilder, consoleBuilder ConsoleB
 		}
 
 		go func() {
-			src, err := ioutil.ReadFile(path)
+			src, err := os.ReadFile(path)
 			if err != nil {
 				log.Errorf("Failed to read Go file %q: %v", path, err)
 				return
@@ -109,7 +110,7 @@ func New(elem *dom.Element, editorBuilder EditorBuilder, consoleBuilder ConsoleB
 				log.Errorf("Failed to format Go file %q: %v", path, err)
 				return
 			}
-			err = ioutil.WriteFile(path, out, 0)
+			err = os.WriteFile(path, out, 0)
 			if err != nil {
 				log.Errorf("Failed to write Go file %q: %v", path, err)
 				return
@@ -183,11 +184,12 @@ func (w *window) makeDefaultEditor(id int, title, contents *dom.Element) Tabber
 
 	title.SetInnerHTML(`<input type="text" class="editor-file-picker" placeholder="file_name.go" spellcheck=false />`)
 	inputElem := title.QuerySelector("input")
-	dom.QueueMicrotask(func() {
-		inputElem.Focus() // run focus on next run loop so opening a file immediately doesn't trigger onblur
-	})
+	inputElem.Focus()
 
-	keydownFn := func(event js.Value) {
+	blurListener := inputElem.AddEventListener("blur", func(js.Value) {
+		w.editorsPane.closeTabID(id)
+	})
+	title.AddEventListener("keydown", func(event js.Value) {
 		if event.Get("key").String() != "Enter" {
 			return
 		}
@@ -199,19 +201,15 @@ func (w *window) makeDefaultEditor(id int, title, contents *dom.Element) Tabber
 		if fileName == "" {
 			return
 		}
-		title.SetInnerText("New file")
-		err := editor.OpenFile(fileName)
-		if err != nil {
-			log.Error(err)
-		}
-		w.editorsPane.focusID(id)
-	}
-	title.AddEventListener("keydown", keydownFn)
-	inputElem.AddEventListener("blur", func(event js.Value) {
-		titleText := title.InnerText()
-		if titleText != "New file" {
-			w.editorsPane.closeTabID(id)
-		}
+		inputElem.RemoveEventListener("blur", blurListener)
+		title.SetInnerText("New file") // setting inner text triggers onblur because the input HTML is about to be removed
+		go func() {
+			err := editor.OpenFile(fileName)
+			if err != nil {
+				log.Error(err)
+			}
+			w.editorsPane.focusID(id)
+		}()
 	})
 	return editor
 }
diff --git a/cmd/editor/main.go b/cmd/editor/main.go
index 7c0c828..dde89c0 100644
--- a/cmd/editor/main.go
+++ b/cmd/editor/main.go
@@ -1,10 +1,10 @@
+//go:build js
 // +build js
 
 package main
 
 import (
 	"flag"
-	"io/ioutil"
 	"os"
 	"syscall/js"
 
@@ -85,7 +85,7 @@ func main() {
 	fmt.Println("Hello from Wasm!", datasize.Gigabytes(4))
 }
 `
-		err := ioutil.WriteFile("main.go", []byte(mainGoContents), 0600)
+		err := os.WriteFile("main.go", []byte(mainGoContents), 0600)
 		if err != nil {
 			log.Error("Failed to write to main.go: ", err)
 			return
diff --git a/cmd/editor/plaineditor/editor.go b/cmd/editor/plaineditor/editor.go
index c21cd57..8c7ccdd 100644
--- a/cmd/editor/plaineditor/editor.go
+++ b/cmd/editor/plaineditor/editor.go
@@ -1,9 +1,10 @@
+//go:build js
 // +build js
 
 package plaineditor
 
 import (
-	"io/ioutil"
+	"os"
 	"syscall/js"
 
 	"github.com/hack-pad/hackpad/cmd/editor/dom"
@@ -50,7 +51,7 @@ func (e *textAreaEditor) CurrentFile() string {
 }
 
 func (e *textAreaEditor) ReloadFile() error {
-	contents, err := ioutil.ReadFile(e.filePath)
+	contents, err := os.ReadFile(e.filePath)
 	if err != nil {
 		return err
 	}
@@ -59,7 +60,7 @@ func (e *textAreaEditor) ReloadFile() error {
 }
 
 func (e *textAreaEditor) edited(newContents func() string) {
-	err := ioutil.WriteFile(e.filePath, []byte(newContents()), 0600)
+	err := os.WriteFile(e.filePath, []byte(newContents()), 0600)
 	if err != nil {
 		log.Errorf("Failed to write %s: %s", e.filePath, err.Error())
 		return
diff --git a/cmd/editor/plaineditor/typer.go b/cmd/editor/plaineditor/typer.go
index 40f7c5b..1fbfeb1 100644
--- a/cmd/editor/plaineditor/typer.go
+++ b/cmd/editor/plaineditor/typer.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package plaineditor
@@ -42,7 +43,7 @@ func handleKeydown(event js.Value) {
 	selectionEnd := target.Get("selectionEnd").Int()
 	key := event.Get("key").String()
 	code := event.Get("code").String()
-	//metaKey := event.Get("metaKey").Bool()
+	// metaKey := event.Get("metaKey").Bool()
 
 	preventDefault := func() {
 		event.Call("preventDefault")
@@ -59,11 +60,11 @@ func handleKeydown(event js.Value) {
 
 	if code == KeyEnter {
 		// TODO restore cmd+enter triggering run button
-		//if metaKey {
-		//preventDefault()
-		//runPlayground()
-		//return
-		//}
+		// if metaKey {
+		//     preventDefault()
+		//     runPlayground()
+		//     return
+		// }
 
 		lastNewLine := strings.LastIndexByte(slice(text, 0, selectionStart), '\n')
 		if lastNewLine != -1 {
diff --git a/cmd/editor/taskconsole/console.go b/cmd/editor/taskconsole/console.go
index f8908b8..aabaa0c 100644
--- a/cmd/editor/taskconsole/console.go
+++ b/cmd/editor/taskconsole/console.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package taskconsole
diff --git a/cmd/editor/taskconsole/writer_elem.go b/cmd/editor/taskconsole/writer_elem.go
index 5c46b76..6554354 100644
--- a/cmd/editor/taskconsole/writer_elem.go
+++ b/cmd/editor/taskconsole/writer_elem.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package taskconsole
diff --git a/cmd/editor/terminal/terminal.go b/cmd/editor/terminal/terminal.go
index abb485d..232fa01 100644
--- a/cmd/editor/terminal/terminal.go
+++ b/cmd/editor/terminal/terminal.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package terminal
@@ -35,7 +36,7 @@ type terminal struct {
 
 func (b *terminalBuilder) New(elem *dom.Element, rawName, name string, args ...string) (ide.Console, error) {
 	term := &terminal{
-		xterm:     b.newXTermFunc.Invoke(elem),
+		xterm:     b.newXTermFunc.Invoke(elem.JSValue()),
 		titleChan: make(chan string, 1),
 	}
 	go func() {
@@ -112,7 +113,7 @@ func (t *terminal) Close() error {
 	}
 	t.closed = true
 	const colorRed = "\033[1;31m"
-	t.xterm.Call("write", idbblob.FromBlob(blob.NewBytes([]byte("\n\r"+colorRed+"[exited]\n\r"))))
+	t.xterm.Call("write", idbblob.FromBlob(blob.NewBytes([]byte("\n\r"+colorRed+"[exited]\n\r"))).JSValue())
 	var err error
 	for _, closer := range t.closables {
 		cErr := closer()
@@ -130,7 +131,7 @@ func (t *terminal) readOutputPipes(r io.Reader) {
 		_, err := r.Read(buf)
 		switch err {
 		case nil:
-			t.xterm.Call("write", idbblob.FromBlob(blob.NewBytes(buf)))
+			t.xterm.Call("write", idbblob.FromBlob(blob.NewBytes(buf)).JSValue())
 		case io.EOF:
 			t.Close()
 			return
diff --git a/cmd/sh/main.go b/cmd/sh/main.go
index 11f9656..938b006 100644
--- a/cmd/sh/main.go
+++ b/cmd/sh/main.go
@@ -1,7 +1,7 @@
 package main
 
 import (
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 
@@ -9,7 +9,7 @@ import (
 )
 
 func main() {
-	log.SetOutput(ioutil.Discard)
+	log.SetOutput(io.Discard)
 	exitCode := hush.Run()
 	os.Exit(exitCode)
 }
diff --git a/go.mod b/go.mod
index 57315e8..4497bae 100644
--- a/go.mod
+++ b/go.mod
@@ -1,15 +1,30 @@
 module github.com/hack-pad/hackpad
 
-go 1.16
+go 1.20
 
 require (
 	github.com/avct/uasurfer v0.0.0-20191028135549-26b5daa857f1
-	github.com/hack-pad/go-indexeddb v0.1.0
-	github.com/hack-pad/hackpadfs v0.1.2
+	github.com/hack-pad/go-indexeddb v0.3.2
+	github.com/hack-pad/hackpadfs v0.2.1
 	github.com/hack-pad/hush v0.1.0
 	github.com/johnstarich/go/datasize v0.0.1
 	github.com/machinebox/progress v0.2.0
 	github.com/pkg/errors v0.9.1
-	github.com/stretchr/testify v1.5.1
 	go.uber.org/atomic v1.6.0
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/fatih/color v1.12.0 // indirect
+	github.com/hack-pad/safejs v0.1.1 // indirect
+	github.com/matryer/is v1.4.1 // indirect
+	github.com/mattn/go-colorable v0.1.8 // indirect
+	github.com/mattn/go-isatty v0.0.12 // indirect
+	github.com/mattn/go-tty v0.0.3 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/objx v0.5.0 // indirect
+	github.com/stretchr/testify v1.8.2 // indirect
+	golang.org/x/sys v0.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	mvdan.cc/sh/v3 v3.3.0 // indirect
+)
diff --git a/go.sum b/go.sum
index 954e55c..2a362ea 100644
--- a/go.sum
+++ b/go.sum
@@ -10,16 +10,16 @@ github.com/fatih/color v1.12.0 h1:mRhaKNwANqRgUBGKmnI5ZxEk7QXmjQeCcuYFMX2bfcc=
 github.com/fatih/color v1.12.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
 github.com/google/renameio v1.0.1-0.20210406141108-81588dbe0453 h1:vvZyWjAX9oDB+DWpMsZMyv6Q3NZtim2C5Zcdh+H0OmQ=
 github.com/google/renameio v1.0.1-0.20210406141108-81588dbe0453/go.mod h1:t/HQoYBZSsWSNK35C6CO/TpPLDVWvxOHboWUAweKUpk=
-github.com/hack-pad/go-indexeddb v0.1.0 h1:UzRAl6WiKxLJePkgi2uaQa9MMPWcjO29zI3pt9D+rNs=
-github.com/hack-pad/go-indexeddb v0.1.0/go.mod h1:NH8CaojufPNcKYDhy5JkjfyBXE/72oJPeiywlabN/lM=
-github.com/hack-pad/hackpadfs v0.1.1 h1:DhzS50ln5XAOxZ0Xlnb/o3P/+MWUqlcbGdOQ5m+Fg6c=
-github.com/hack-pad/hackpadfs v0.1.1/go.mod h1:8bsINHOQhQUioUUiCzCyZZNLfEXjs0RwBIf3lTG+CEg=
-github.com/hack-pad/hackpadfs v0.1.2 h1:ZsHfvrNAMNNBVLMKprOiN2rLD37x+YGj3QPJrhUdRF4=
-github.com/hack-pad/hackpadfs v0.1.2/go.mod h1:8bsINHOQhQUioUUiCzCyZZNLfEXjs0RwBIf3lTG+CEg=
-github.com/hack-pad/hush v0.0.0-20210730065049-bd589dbef3a3 h1:0WBvEONkD8zXBRe7+5+mp34L2Upmok0yPKvOqOzpksw=
-github.com/hack-pad/hush v0.0.0-20210730065049-bd589dbef3a3/go.mod h1:NqjEIfyA2YtlnEPlI/1K3tNuyXGByWFadPxPlGrDPms=
+github.com/hack-pad/go-indexeddb v0.3.2 h1:DTqeJJYc1usa45Q5r52t01KhvlSN02+Oq+tQbSBI91A=
+github.com/hack-pad/go-indexeddb v0.3.2/go.mod h1:QvfTevpDVlkfomY498LhstjwbPW6QC4VC/lxYb0Kom0=
+github.com/hack-pad/hackpadfs v0.2.1 h1:FelFhIhv26gyjujoA/yeFO+6YGlqzmc9la/6iKMIxMw=
+github.com/hack-pad/hackpadfs v0.2.1/go.mod h1:khQBuCEwGXWakkmq8ZiFUvUZz84ZkJ2KNwKvChs4OrU=
 github.com/hack-pad/hush v0.1.0 h1:lm/iUaRpVsKkpbN6U9wf45arVnCXzTqsMG1jyihIgkI=
 github.com/hack-pad/hush v0.1.0/go.mod h1:NqjEIfyA2YtlnEPlI/1K3tNuyXGByWFadPxPlGrDPms=
+github.com/hack-pad/safejs v0.1.0 h1:qPS6vjreAqh2amUqj4WNG1zIw7qlRQJ9K10eDKMCnE8=
+github.com/hack-pad/safejs v0.1.0/go.mod h1:HdS+bKF1NrE72VoXZeWzxFOVQVUSqZJAG0xNCnb+Tio=
+github.com/hack-pad/safejs v0.1.1 h1:d5qPO0iQ7h2oVtpzGnLExE+Wn9AtytxIfltcS2b9KD8=
+github.com/hack-pad/safejs v0.1.1/go.mod h1:HdS+bKF1NrE72VoXZeWzxFOVQVUSqZJAG0xNCnb+Tio=
 github.com/johnstarich/go/datasize v0.0.1 h1:Hjswen8gwmO7trXtQ8Xl8NUOQAKKm1wvus3/xK5eHGY=
 github.com/johnstarich/go/datasize v0.0.1/go.mod h1:4eHLMGz7Q5uCmZeS9rZdahvAih1QmBg1EW3bBXTJpi4=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
@@ -32,8 +32,8 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/machinebox/progress v0.2.0 h1:7z8+w32Gy1v8S6VvDoOPPBah3nLqdKjr3GUly18P8Qo=
 github.com/machinebox/progress v0.2.0/go.mod h1:hl4FywxSjfmkmCrersGhmJH7KwuKl+Ueq9BXkOny+iE=
-github.com/matryer/is v1.4.0 h1:sosSmIWwkYITGrxZ25ULNDeKiMNzFSr4V/eqBQP0PeE=
-github.com/matryer/is v1.4.0/go.mod h1:8I/i5uYgLzgsgEloJE1U6xx5HkBQpAZvepWuujKwMRU=
+github.com/matryer/is v1.4.1 h1:55ehd8zaGABKLXQUe2awZ99BD/PTc2ls+KV/dXphgEQ=
+github.com/matryer/is v1.4.1/go.mod h1:8I/i5uYgLzgsgEloJE1U6xx5HkBQpAZvepWuujKwMRU=
 github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
 github.com/mattn/go-colorable v0.1.8 h1:c1ghPdyEDarC70ftn0y+A/Ee++9zz8ljHG1b13eJ0s8=
 github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
@@ -55,15 +55,23 @@ github.com/rogpeppe/go-internal v1.7.0 h1:3qqXGV8nn7GJT65debw77Dzrx9sfWYgP0DDo7x
 github.com/rogpeppe/go-internal v1.7.0/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
 github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0 h1:1zr/of2m5FGMsad5YfcqgdqdWrIhu+EBEJRhR1U7z/c=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
+github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 go.uber.org/atomic v1.6.0 h1:Ezj3JGmsOnG1MoRWQkPBsKLe9DwWD9QeXzTRzzldNVk=
 go.uber.org/atomic v1.6.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de h1:5hukYrvBGR8/eNkX5mdUezrA6JiaEZDtJb9Ei+1LlBs=
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
+golang.org/x/mod v0.7.0 h1:LapD9S96VoQRhi/GrNTqeBJFrUjs5UHCAtTlgwA5oZA=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
@@ -78,26 +86,28 @@ golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210503080704-8803ae5d1324 h1:pAwJxDByZctfPwzlNGrDN2BQLsdPb9NkhoTJtUkAO28=
 golang.org/x/sys v0.0.0-20210503080704-8803ae5d1324/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.4.0 h1:Zr2JFtRQNX3BCZ8YtxRE9hNJYC8J6I1MVbMg6owUp18=
+golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20210503060354-a79de5458b56 h1:b8jxX3zqjpqb2LklXPzKSGJhzyxCOZSz8ncv8Nv+y7w=
 golang.org/x/term v0.0.0-20210503060354-a79de5458b56/go.mod h1:tfny5GFUkzUvx4ps4ajbZsCe5lw1metzhBm9T3x7oIY=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c h1:IGkKhmfzcztjm6gYkykvu/NiS8kaqbCWAEWWAyf8J5U=
 golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.5.0 h1:+bSpV5HIeWkuvgaMfI3UmKRThoTA5ODJTUd8T17NO+4=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7 h1:9zdDQZ7Thm29KFXgAX/+yaf3eVbP7djjWp/dXAppNCc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0 h1:0vLT13EuvQ0hNvakwLuFZ/jYrLp5F3kcWHXdRggjCE8=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 mvdan.cc/editorconfig v0.2.0 h1:XL+7ys6ls/RKrkUNFQvEwIvNHh+JKx8Mj1pUV5wQxQE=
 mvdan.cc/editorconfig v0.2.0/go.mod h1:lvnnD3BNdBYkhq+B4uBuFFKatfp02eB6HixDvEz91C0=
 mvdan.cc/sh/v3 v3.3.0 h1:ujzElMnry63f4I5sjPFxzo6xia+gwsHZM0yyauuyZ6k=
diff --git a/http_get.go b/http_get.go
index d00aaa0..1004e24 100644
--- a/http_get.go
+++ b/http_get.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package main
diff --git a/install.go b/install.go
index 3d61311..3f856ff 100644
--- a/install.go
+++ b/install.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package main
@@ -25,7 +26,7 @@ func installFunc(this js.Value, args []js.Value) interface{} {
 		}
 		resolve(nil)
 	}()
-	return prom
+	return prom.JSValue()
 }
 
 func install(args []js.Value) error {
diff --git a/internal/common/js.go b/internal/common/js.go
index 07bc0ae..b4f4f23 100644
--- a/internal/common/js.go
+++ b/internal/common/js.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package common
diff --git a/internal/console/js_console.go b/internal/console/js_console.go
index 8f9b6cb..633ea58 100644
--- a/internal/console/js_console.go
+++ b/internal/console/js_console.go
@@ -1,3 +1,4 @@
+//go:build js && wasm
 // +build js,wasm
 
 package console
diff --git a/internal/console/writer_elem.go b/internal/console/writer_elem.go
index 8fffd70..7560a37 100644
--- a/internal/console/writer_elem.go
+++ b/internal/console/writer_elem.go
@@ -1,3 +1,4 @@
+//go:build js && wasm
 // +build js,wasm
 
 package console
diff --git a/internal/fs/download.go b/internal/fs/download.go
index e64647f..26d127f 100644
--- a/internal/fs/download.go
+++ b/internal/fs/download.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/fs/file_descriptors_js.go b/internal/fs/file_descriptors_js.go
index 830d141..e5bf644 100644
--- a/internal/fs/file_descriptors_js.go
+++ b/internal/fs/file_descriptors_js.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/fs/fs_js.go b/internal/fs/fs_js.go
index 526ab9b..c84fc05 100644
--- a/internal/fs/fs_js.go
+++ b/internal/fs/fs_js.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/fs/fs_other.go b/internal/fs/fs_other.go
index c3d5b35..2b9f628 100644
--- a/internal/fs/fs_other.go
+++ b/internal/fs/fs_other.go
@@ -1,3 +1,4 @@
+//go:build !js
 // +build !js
 
 package fs
diff --git a/internal/fs/pipe.go b/internal/fs/pipe.go
index e4ddb39..dd6c80f 100644
--- a/internal/fs/pipe.go
+++ b/internal/fs/pipe.go
@@ -38,8 +38,6 @@ func newPipe(newFID func() FID) (r, w *fileDescriptor) {
 }
 
 type pipeChan struct {
-	unimplementedFile
-
 	buf            chan byte
 	done           chan struct{}
 	reader, writer FID
diff --git a/internal/fs/wasm_cache.go b/internal/fs/wasm_cache.go
index fce0589..bc1f8fc 100644
--- a/internal/fs/wasm_cache.go
+++ b/internal/fs/wasm_cache.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/global/init.go b/internal/global/init.go
index 16840a8..78b08ba 100644
--- a/internal/global/init.go
+++ b/internal/global/init.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package global
diff --git a/internal/interop/download.go b/internal/interop/download.go
index a8d2d83..aa7458f 100644
--- a/internal/interop/download.go
+++ b/internal/interop/download.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package interop
diff --git a/internal/interop/error_js.go b/internal/interop/error_js.go
index e1ca60c..f2d5c16 100644
--- a/internal/interop/error_js.go
+++ b/internal/interop/error_js.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package interop
@@ -9,13 +10,13 @@ import (
 	"github.com/pkg/errors"
 )
 
-func WrapAsJSError(err error, message string) error {
+func WrapAsJSError(err error, message string) js.Value {
 	return wrapAsJSError(err, message)
 }
 
-func wrapAsJSError(err error, message string, args ...js.Value) error {
+func wrapAsJSError(err error, message string, args ...js.Value) js.Value {
 	if err == nil {
-		return nil
+		return js.Null()
 	}
 
 	errMessage := errors.Wrap(err, message).Error()
@@ -23,9 +24,8 @@ func wrapAsJSError(err error, message string, args ...js.Value) error {
 		errMessage += fmt.Sprintf("\n%v", arg)
 	}
 
-	val := js.ValueOf(map[string]interface{}{
+	return js.ValueOf(map[string]interface{}{
 		"message": js.ValueOf(errMessage),
 		"code":    js.ValueOf(mapToErrNo(err, errMessage)),
 	})
-	return js.Error{Value: val}
 }
diff --git a/internal/interop/event.go b/internal/interop/event.go
index 8e0748a..5132115 100644
--- a/internal/interop/event.go
+++ b/internal/interop/event.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package interop
@@ -21,17 +22,8 @@ func NewEventTarget() EventTarget {
 }
 
 type Event struct {
-	Target          js.Value
-	Type            string
-	stopPropagation bool
-}
-
-func (e Event) StopPropagation() {
-	e.stopPropagation = true
-}
-
-func (e Event) Stopped() bool {
-	return e.stopPropagation
+	Target js.Value
+	Type   string
 }
 
 type eventTarget struct {
diff --git a/internal/interop/funcs.go b/internal/interop/funcs.go
index 4881c7a..9e37e60 100644
--- a/internal/interop/funcs.go
+++ b/internal/interop/funcs.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package interop
@@ -68,8 +69,8 @@ func setFuncHandler(name string, fn interface{}, args []js.Value) (returnedVal i
 			}()
 
 			ret, err = fn(args)
-			err = wrapAsJSError(err, name, args...)
-			ret = append([]interface{}{err}, ret...)
+			errValue := wrapAsJSError(err, name, args...)
+			ret = append([]interface{}{errValue}, ret...)
 			callback.Invoke(ret...)
 		}()
 		return nil
diff --git a/internal/interop/load.go b/internal/interop/load.go
index c04ec63..d23e168 100644
--- a/internal/interop/load.go
+++ b/internal/interop/load.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package interop
diff --git a/internal/interop/once_func.go b/internal/interop/once_func.go
index 9f24635..983b107 100644
--- a/internal/interop/once_func.go
+++ b/internal/interop/once_func.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package interop
diff --git a/internal/interop/profile.go b/internal/interop/profile.go
index 3b488ff..eecd6a6 100644
--- a/internal/interop/profile.go
+++ b/internal/interop/profile.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package interop
@@ -18,8 +19,8 @@ func ProfileJS(this js.Value, args []js.Value) interface{} {
 	go func() {
 		MemoryProfileJS(this, args)
 		// Re-enable once these profiles actually work in the browser. Currently produces 0 samples.
-		//TraceProfileJS(this, args)
-		//StartCPUProfileJS(this, args)
+		// TraceProfileJS(this, args)
+		// StartCPUProfileJS(this, args)
 	}()
 	return nil
 }
diff --git a/internal/interop/value_caches.go b/internal/interop/value_caches.go
index fb39fd8..3477c44 100644
--- a/internal/interop/value_caches.go
+++ b/internal/interop/value_caches.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package interop
diff --git a/internal/interop/values.go b/internal/interop/values.go
index eaf09af..d0e14a9 100644
--- a/internal/interop/values.go
+++ b/internal/interop/values.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package interop
diff --git a/internal/js/fs/chmod.go b/internal/js/fs/chmod.go
index 6977ba5..ac51928 100644
--- a/internal/js/fs/chmod.go
+++ b/internal/js/fs/chmod.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/chown.go b/internal/js/fs/chown.go
index 779671a..c00b726 100644
--- a/internal/js/fs/chown.go
+++ b/internal/js/fs/chown.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/close.go b/internal/js/fs/close.go
index c1c8919..f7c96d7 100644
--- a/internal/js/fs/close.go
+++ b/internal/js/fs/close.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/fchmod.go b/internal/js/fs/fchmod.go
index 8c04fa5..00681c6 100644
--- a/internal/js/fs/fchmod.go
+++ b/internal/js/fs/fchmod.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/flock.go b/internal/js/fs/flock.go
index cf9f041..5957aab 100644
--- a/internal/js/fs/flock.go
+++ b/internal/js/fs/flock.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/fs.go b/internal/js/fs/fs.go
index 3d84e68..efaac7a 100644
--- a/internal/js/fs/fs.go
+++ b/internal/js/fs/fs.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
@@ -118,9 +119,9 @@ func destroyMount(this js.Value, args []js.Value) interface{} {
 	resolve, reject, prom := promise.New()
 	mountPath := args[0].String()
 	go func() {
-		err := interop.WrapAsJSError(fs.DestroyMount(mountPath), "destroyMount")
-		if err != nil {
-			reject(err)
+		jsErr := interop.WrapAsJSError(fs.DestroyMount(mountPath), "destroyMount")
+		if jsErr.Type() != js.TypeNull {
+			reject(jsErr)
 		} else {
 			resolve(nil)
 		}
diff --git a/internal/js/fs/fstat.go b/internal/js/fs/fstat.go
index aed0af1..635452d 100644
--- a/internal/js/fs/fstat.go
+++ b/internal/js/fs/fstat.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/fsync.go b/internal/js/fs/fsync.go
index a42fd37..83c6475 100644
--- a/internal/js/fs/fsync.go
+++ b/internal/js/fs/fsync.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/ftruncate.go b/internal/js/fs/ftruncate.go
index cf8d478..401b052 100644
--- a/internal/js/fs/ftruncate.go
+++ b/internal/js/fs/ftruncate.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/lstat.go b/internal/js/fs/lstat.go
index 402c65a..dd766f4 100644
--- a/internal/js/fs/lstat.go
+++ b/internal/js/fs/lstat.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/mkdir.go b/internal/js/fs/mkdir.go
index 34a9cde..5825d59 100644
--- a/internal/js/fs/mkdir.go
+++ b/internal/js/fs/mkdir.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/open.go b/internal/js/fs/open.go
index 6d48057..cbd36ce 100644
--- a/internal/js/fs/open.go
+++ b/internal/js/fs/open.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
@@ -31,5 +32,5 @@ func openSync(args []js.Value) (interface{}, error) {
 
 	p := process.Current()
 	fd, err := p.Files().Open(path, flags, mode)
-	return fd, err
+	return fd.JSValue(), err
 }
diff --git a/internal/js/fs/overlay.go b/internal/js/fs/overlay.go
index d7ab43b..aa94ee9 100644
--- a/internal/js/fs/overlay.go
+++ b/internal/js/fs/overlay.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
@@ -37,7 +38,7 @@ func overlayIndexedDB(this js.Value, args []js.Value) interface{} {
 			resolve(nil)
 		}
 	}()
-	return prom
+	return prom.JSValue()
 }
 
 func OverlayIndexedDB(args []js.Value) (err error) {
@@ -76,7 +77,7 @@ func overlayTarGzip(this js.Value, args []js.Value) interface{} {
 			resolve(nil)
 		}
 	}()
-	return prom
+	return prom.JSValue()
 }
 
 func OverlayTarGzip(args []js.Value) error {
diff --git a/internal/js/fs/pipe.go b/internal/js/fs/pipe.go
index 52808fc..4880555 100644
--- a/internal/js/fs/pipe.go
+++ b/internal/js/fs/pipe.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
@@ -20,5 +21,5 @@ func pipeSync(args []js.Value) (interface{}, error) {
 	}
 	p := process.Current()
 	fds := p.Files().Pipe()
-	return []interface{}{fds[0], fds[1]}, nil
+	return []interface{}{fds[0].JSValue(), fds[1].JSValue()}, nil
 }
diff --git a/internal/js/fs/read.go b/internal/js/fs/read.go
index ce69947..21b76bb 100644
--- a/internal/js/fs/read.go
+++ b/internal/js/fs/read.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/readdir.go b/internal/js/fs/readdir.go
index c06ca17..17e0c44 100644
--- a/internal/js/fs/readdir.go
+++ b/internal/js/fs/readdir.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/rename.go b/internal/js/fs/rename.go
index 86731cf..aac86ac 100644
--- a/internal/js/fs/rename.go
+++ b/internal/js/fs/rename.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/rmdir.go b/internal/js/fs/rmdir.go
index f15e5cf..e3a518f 100644
--- a/internal/js/fs/rmdir.go
+++ b/internal/js/fs/rmdir.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/stat.go b/internal/js/fs/stat.go
index 1abdb85..64be1ed 100644
--- a/internal/js/fs/stat.go
+++ b/internal/js/fs/stat.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
@@ -35,13 +36,13 @@ var (
 	})
 )
 
-func jsStat(info os.FileInfo) interface{} {
+func jsStat(info os.FileInfo) js.Value {
 	if info == nil {
-		return nil
+		return js.Null()
 	}
 	const blockSize = 4096 // TODO find useful value for blksize
 	modTime := info.ModTime().UnixNano() / 1e6
-	return map[string]interface{}{
+	return js.ValueOf(map[string]interface{}{
 		"dev":     0,
 		"ino":     0,
 		"mode":    jsMode(info.Mode()),
@@ -63,7 +64,7 @@ func jsStat(info os.FileInfo) interface{} {
 		"isFile":            jsBoolFunc(info.Mode().IsRegular()),
 		"isSocket":          funcFalse,
 		"isSymbolicLink":    jsBoolFunc(info.Mode()&os.ModeSymlink == os.ModeSymlink),
-	}
+	})
 }
 
 var modeBitTranslation = map[os.FileMode]uint32{
diff --git a/internal/js/fs/unlink.go b/internal/js/fs/unlink.go
index 4f396cc..aaa7847 100644
--- a/internal/js/fs/unlink.go
+++ b/internal/js/fs/unlink.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/utimes.go b/internal/js/fs/utimes.go
index 70765e7..5e1e9eb 100644
--- a/internal/js/fs/utimes.go
+++ b/internal/js/fs/utimes.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
diff --git a/internal/js/fs/write.go b/internal/js/fs/write.go
index 053d981..361757b 100644
--- a/internal/js/fs/write.go
+++ b/internal/js/fs/write.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package fs
@@ -45,5 +46,5 @@ func write(args []js.Value) ([]interface{}, error) {
 
 	p := process.Current()
 	n, err := p.Files().Write(fd, buffer, offset, length, position)
-	return []interface{}{n, buffer}, err
+	return []interface{}{n, buffer.JSValue()}, err
 }
diff --git a/internal/js/process/dir.go b/internal/js/process/dir.go
index e29cf96..b3ca96b 100644
--- a/internal/js/process/dir.go
+++ b/internal/js/process/dir.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package process
diff --git a/internal/js/process/groups.go b/internal/js/process/groups.go
index 097cc96..dffca5e 100644
--- a/internal/js/process/groups.go
+++ b/internal/js/process/groups.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package process
diff --git a/internal/js/process/process.go b/internal/js/process/process.go
index f687eae..c46b156 100644
--- a/internal/js/process/process.go
+++ b/internal/js/process/process.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package process
@@ -26,8 +27,8 @@ func Init() {
 	interop.SetFunc(jsProcess, "getgid", getegid)
 	interop.SetFunc(jsProcess, "getegid", getegid)
 	interop.SetFunc(jsProcess, "getgroups", getgroups)
-	jsProcess.Set("pid", currentProcess.PID())
-	jsProcess.Set("ppid", currentProcess.ParentPID())
+	jsProcess.Set("pid", currentProcess.PID().JSValue())
+	jsProcess.Set("ppid", currentProcess.ParentPID().JSValue())
 	interop.SetFunc(jsProcess, "umask", umask)
 	interop.SetFunc(jsProcess, "cwd", cwd)
 	interop.SetFunc(jsProcess, "chdir", chdir)
@@ -35,14 +36,14 @@ func Init() {
 	globals.Set("child_process", map[string]interface{}{})
 	childProcess := globals.Get("child_process")
 	interop.SetFunc(childProcess, "spawn", spawn)
-	//interop.SetFunc(childProcess, "spawnSync", spawnSync) // TODO is there any way to run spawnSync so we don't hit deadlock?
+	// interop.SetFunc(childProcess, "spawnSync", spawnSync) // TODO is there any way to run spawnSync so we don't hit deadlock?
 	interop.SetFunc(childProcess, "wait", wait)
 	interop.SetFunc(childProcess, "waitSync", waitSync)
 }
 
 func switchedContext(pid, ppid process.PID) {
-	jsProcess.Set("pid", pid)
-	jsProcess.Set("ppid", ppid)
+	jsProcess.Set("pid", pid.JSValue())
+	jsProcess.Set("ppid", ppid.JSValue())
 }
 
 func Dump() interface{} {
diff --git a/internal/js/process/spawn.go b/internal/js/process/spawn.go
index 81c487b..ee544b3 100644
--- a/internal/js/process/spawn.go
+++ b/internal/js/process/spawn.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package process
@@ -35,12 +36,16 @@ func spawn(args []js.Value) (interface{}, error) {
 	return Spawn(command, argv, procAttr)
 }
 
-func Spawn(command string, args []string, attr *process.ProcAttr) (process.Process, error) {
+type jsWrapper interface {
+	JSValue() js.Value
+}
+
+func Spawn(command string, args []string, attr *process.ProcAttr) (js.Value, error) {
 	p, err := process.New(command, args, attr)
 	if err != nil {
-		return p, err
+		return js.Value{}, err
 	}
-	return p, p.Start()
+	return p.(jsWrapper).JSValue(), p.Start()
 }
 
 func parseProcAttr(defaultCommand string, value js.Value) (argv0 string, attr *process.ProcAttr) {
diff --git a/internal/js/process/umask.go b/internal/js/process/umask.go
index 55b37d4..3b5da65 100644
--- a/internal/js/process/umask.go
+++ b/internal/js/process/umask.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package process
diff --git a/internal/js/process/wait.go b/internal/js/process/wait.go
index 98375cf..5c0b90b 100644
--- a/internal/js/process/wait.go
+++ b/internal/js/process/wait.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package process
@@ -22,10 +23,10 @@ func waitSync(args []js.Value) (interface{}, error) {
 	pid := process.PID(args[0].Int())
 	waitStatus := new(syscall.WaitStatus)
 	wpid, err := Wait(pid, waitStatus, 0, nil)
-	return map[string]interface{}{
-		"pid":      wpid,
+	return js.ValueOf(map[string]interface{}{
+		"pid":      wpid.JSValue(),
 		"exitCode": waitStatus.ExitStatus(),
-	}, err
+	}), err
 }
 
 func Wait(pid process.PID, wstatus *syscall.WaitStatus, options int, rusage *syscall.Rusage) (wpid process.PID, err error) {
diff --git a/internal/log/js_log.go b/internal/log/js_log.go
index d59c394..5373b92 100644
--- a/internal/log/js_log.go
+++ b/internal/log/js_log.go
@@ -1,15 +1,18 @@
+//go:build js && wasm
 // +build js,wasm
 
 package log
 
 import (
+	"fmt"
 	"syscall/js"
 
 	"github.com/hack-pad/hackpad/internal/global"
+	"github.com/hack-pad/safejs"
 )
 
 var (
-	console = js.Global().Get("console")
+	console = safejs.MustGetGlobal("console")
 )
 
 const logLevelKey = "logLevel"
@@ -53,10 +56,18 @@ func logJSValues(kind consoleType, args ...interface{}) int {
 	if kind < logLevel {
 		return 0
 	}
-	console.Call(kind.String(), args...)
+	var jsArgs []interface{}
+	for _, arg := range args {
+		jsArg, err := safejs.ValueOf(arg)
+		if err != nil {
+			jsArg = safejs.Safe(js.ValueOf(fmt.Sprintf("LOGERR(%s: %T %+v)", err, arg, arg)))
+		}
+		jsArgs = append(jsArgs, jsArg)
+	}
+	_, _ = console.Call(kind.String(), jsArgs...)
 	return 0
 }
 
 func writeLog(c consoleType, s string) {
-	console.Call(c.String(), s)
+	_, _ = console.Call(c.String(), s)
 }
diff --git a/internal/log/other_log.go b/internal/log/other_log.go
index 183b3d9..4cecda3 100644
--- a/internal/log/other_log.go
+++ b/internal/log/other_log.go
@@ -1,3 +1,4 @@
+//go:build !js
 // +build !js
 
 package log
diff --git a/internal/process/process_js.go b/internal/process/process_js.go
index 3b152d7..d0f0981 100644
--- a/internal/process/process_js.go
+++ b/internal/process/process_js.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package process
@@ -14,8 +15,8 @@ var (
 
 func (p *process) JSValue() js.Value {
 	return js.ValueOf(map[string]interface{}{
-		"pid":   p.pid,
-		"ppid":  p.parentPID,
+		"pid":   p.pid.JSValue(),
+		"ppid":  p.parentPID.JSValue(),
 		"error": interop.WrapAsJSError(p.err, "spawn"),
 	})
 }
diff --git a/internal/process/process_other.go b/internal/process/process_other.go
index 867ede1..0511890 100644
--- a/internal/process/process_other.go
+++ b/internal/process/process_other.go
@@ -1,3 +1,4 @@
+//go:build !js
 // +build !js
 
 package process
diff --git a/internal/process/wasm.go b/internal/process/wasm.go
index 058a7a1..eb20df1 100644
--- a/internal/process/wasm.go
+++ b/internal/process/wasm.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package process
diff --git a/internal/promise/js.go b/internal/promise/js.go
index 88fe6b7..eaf574c 100644
--- a/internal/promise/js.go
+++ b/internal/promise/js.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package promise
diff --git a/internal/terminal/term.go b/internal/terminal/term.go
index f717d32..9545346 100644
--- a/internal/terminal/term.go
+++ b/internal/terminal/term.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package terminal
diff --git a/main.go b/main.go
index 6b9661e..158b397 100644
--- a/main.go
+++ b/main.go
@@ -1,3 +1,4 @@
+//go:build js
 // +build js
 
 package main