diff --git a/COPYING.txt b/COPYING.txt
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--- /dev/null
+++ b/COPYING.txt
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
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+  When we speak of free software, we are referring to freedom, not
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+  Developers that use the GNU GPL protect your rights with two steps:
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/ades.go b/ades.go
new file mode 100644
index 0000000..855cee7
--- /dev/null
+++ b/ades.go
@@ -0,0 +1,121 @@
+// Copyright (C) 2024  Eric Cornelissen
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+//go:build wasm
+
+package main
+
+import (
+	"syscall/js"
+
+	"github.com/ericcornelissen/ades"
+)
+
+var window = js.Global().Get("window")
+
+type options struct {
+	conservative bool
+}
+
+func parseOptions(opts js.Value) options {
+	return options{
+		conservative: opts.Get("conservative").Bool(),
+	}
+}
+
+func fail(description string, err error) {
+	window.Call("showError", description, err.Error())
+}
+
+func succeed(result []any) {
+	window.Call("showResult", js.ValueOf(result))
+}
+
+func encodeErrorAsMap(violation *ades.Violation) map[string]any {
+	obj := make(map[string]any, 4)
+	obj["job"] = violation.JobId
+	obj["step"] = violation.StepId
+	obj["problem"] = violation.Problem
+	obj["ruleId"] = violation.RuleId
+	return obj
+}
+
+func lintWorkflow(source string, opts *options) ([]ades.Violation, error) {
+	workflow, err := ades.ParseWorkflow([]byte(source))
+	if err != nil {
+		return nil, err
+	}
+
+	var matcher ades.ExprMatcher = ades.AllMatcher
+	if opts.conservative {
+		matcher = ades.ConservativeMatcher
+	}
+
+	return ades.AnalyzeWorkflow(&workflow, matcher), nil
+}
+
+func lintManifest(source string, opts *options) ([]ades.Violation, error) {
+	manifest, err := ades.ParseManifest([]byte(source))
+	if err != nil {
+		return nil, err
+	}
+
+	var matcher ades.ExprMatcher = ades.AllMatcher
+	if opts.conservative {
+		matcher = ades.ConservativeMatcher
+	}
+
+	return ades.AnalyzeManifest(&manifest, matcher), nil
+}
+
+func analyze(source string, opts *options) {
+	violations, err := lintWorkflow(source, opts)
+	if err != nil || len(violations) == 0 {
+		violations, err = lintManifest(source, opts)
+	}
+
+	if err != nil {
+		fail("Parsing failure", err)
+		return
+	}
+
+	result := make([]any, 0, len(violations))
+	for _, violation := range violations {
+		result = append(result, encodeErrorAsMap(&violation))
+	}
+
+	succeed(result)
+	return
+}
+
+func runAdes(_this js.Value, args []js.Value) any {
+	source := args[0].String()
+	opts := parseOptions(args[1])
+	analyze(source, &opts)
+
+	return nil
+}
+
+func main() {
+	window.Set("ades", js.FuncOf(runAdes))
+
+	initialSource := window.Call("getSource").String()
+	rawOpts := window.Call("getOptions")
+	opts := parseOptions(rawOpts)
+	analyze(initialSource, &opts)
+
+	// Keep the program alive
+	select {}
+}
diff --git a/ades.wasm b/ades.wasm
new file mode 100755
index 0000000..ed8ba9a
Binary files /dev/null and b/ades.wasm differ
diff --git a/index.css b/index.css
new file mode 100644
index 0000000..5b1f11d
--- /dev/null
+++ b/index.css
@@ -0,0 +1,80 @@
+/**
+ * Copyright (C) 2024  Eric Cornelissen
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+html {
+  background-color: #FFF;
+  min-height: 100%;
+}
+@media (prefers-color-scheme: dark) {
+  html {
+    filter: invert(1);
+  }
+}
+
+body {
+  box-sizing: border-box;
+  font-size: 14px;
+  font-family: sans-serif;
+  height: 100vh;
+  margin: 0;
+  max-width: 980px;
+  padding: 2rem 2rem 0 ;
+  position: relative;
+}
+p {
+  margin: .25rem 0;
+  padding: 0;
+}
+
+textarea.code {
+  font-family: monospace;
+}
+
+.working {
+  font-style: italic;
+}
+
+.result ul {
+  list-style: none;
+  margin: .5rem 0;
+  padding: 0;
+}
+
+.error .title {
+  display: inline-block;
+  font-weight: bold;
+}
+.error .what {
+  display: inline-block;
+  font-style: italic;
+}
+.error .details {
+  display: block;
+  font-size: bold;
+  margin-top: .25rem;
+}
+
+footer {
+  margin-top: 2rem;
+  padding-bottom: 2rem;
+  position: sticky;
+  top: 100%;
+  width: 100%;
+}
+footer hr {
+  margin-bottom: .8rem;
+}
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..7d1a276
--- /dev/null
+++ b/index.html
@@ -0,0 +1,109 @@
+<!--
+Copyright (C) 2024 Eric Cornelissen
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+	<title>ades</title>
+	<meta charset="utf-8" />
+
+	<meta
+		http-equiv="Content-Security-Policy"
+		content="base-uri 'none'; connect-src 'self'; default-src 'none'; object-src 'none'; script-src 'self' 'wasm-unsafe-eval'; style-src 'self'; trusted-types 'none'; require-trusted-types-for 'script';"
+	/>
+
+	<link rel="stylesheet" href="index.css">
+	<script src="wasm_exec.js"></script>
+</head>
+
+<body>
+	<noscript>
+		This website requires JavaScript and WebAssembly to run. The website's source code is
+		available on
+		<a
+			href="https://github.com/ericcornelissen/ades"
+			rel="noopener"
+		>GitHub</a>
+		, where the tool is also available as a standalone application.
+	</noscript>
+
+	<main>
+		<h1>Actions Dangerous Expressions Scanner</h1>
+		<div>
+			<p>
+				Paste your GitHub Actions workflow or manifest below and get a report of dangerous uses of
+				<a
+					href="https://docs.github.com/en/actions/learn-github-actions/expressions"
+					rel="noopener"
+				>expressions</a>
+				in it.</p>
+			<div>
+				<label>
+					<input
+						id="option-conservative"
+						type="checkbox"
+					> Only expressions known to be controllable by attackers.
+				</label>
+			</div>
+			<textarea
+				class="code"
+				id="workflow-input"
+				rows="24" cols="100"
+			>
+name: Example
+on: [push]
+
+jobs:
+  example:
+    name: example
+    runs-on: ubuntu-latest
+    steps:
+    - name: Safe run
+      run: echo 'Hello world!'
+    - name: Unsafe run
+      run: echo 'Hello ${{ inputs.name }}'
+			</textarea>
+		</div>
+		<div>
+			<h2>Report</h2>
+			<div id="results">
+				<i>Working...</i>
+			</div>
+		</div>
+	</main>
+
+	<footer>
+		<hr/>
+		<p>
+			Code available on
+			<a
+				href="https://github.com/ericcornelissen/ades"
+				rel="noopener"
+			>GitHub</a>
+			by
+			<a
+				href="https://ericcornelissen.dev/"
+				rel="noopener"
+			>@ericcornelissen</a>.
+		</p>
+	</footer>
+
+	<script src="index.js"></script>
+</body>
+
+</html>
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..3fc13b8
--- /dev/null
+++ b/index.js
@@ -0,0 +1,170 @@
+/**
+ * Copyright (C) 2024  Eric Cornelissen
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+const input = document.getElementById("workflow-input");
+const conservative = document.getElementById("option-conservative");
+
+async function loadWasm() {
+  const go = new Go();
+
+  let result;
+  const request = fetch("ades.wasm");
+  if (typeof WebAssembly.instantiateStreaming === "function") {
+    result = await WebAssembly.instantiateStreaming(request, go.importObject);
+  } else {
+    const response = await request;
+    const mod = await response.arrayBuffer();
+    result = await WebAssembly.instantiate(mod, go.importObject);
+  }
+
+  go.run(result.instance);
+}
+
+const htmlEncode = {
+  ruleId: (ruleId) => {
+    const link = `https://github.com/ericcornelissen/ades/blob/main/RULES.md#${ruleId}`;
+
+    const a = document.createElement("a");
+    a.setAttribute("href", link);
+    a.setAttribute("rel", "noopener");
+    a.setAttribute("target", "_blank");
+    a.innerText = ruleId;
+    return a;
+  },
+  violation: (violation) => {
+    const li = document.createElement("li");
+
+    li.appendChild(document.createTextNode("["));
+    li.appendChild(htmlEncode.ruleId(violation.ruleId));
+    li.appendChild(document.createTextNode("]"));
+
+    if (violation.job) {
+      const job = document.createElement("code");
+      job.innerText = violation.job;
+      li.appendChild(document.createTextNode(" In job '"));
+      li.appendChild(job);
+      li.appendChild(document.createTextNode("',"));
+    }
+
+    const step = document.createElement("code");
+    step.innerText = violation.step;
+    li.appendChild(document.createTextNode(" step '"));
+    li.appendChild(step);
+    li.appendChild(document.createTextNode("',"));
+
+    const found = document.createElement("code");
+    found.innerText = violation.problem;
+    li.appendChild(document.createTextNode(" found '"));
+    li.appendChild(found);
+    li.appendChild(document.createTextNode("'."));
+
+    return li;
+  }
+}
+
+function runAnalysis() {
+  const working = document.createElement("p");
+  working.classList.add("working");
+  working.innerText = "Working...";
+
+  setResult(working);
+
+  const source = getSource();
+  const options = getOptions();
+  if (globalThis.ades) ades(source, options);
+}
+
+function getSource() {
+  return input.value.trim();
+}
+
+function getOptions() {
+  return {
+    conservative: conservative.checked,
+  };
+}
+
+function showError(summary, full) {
+  const title = document.createElement("span");
+  title.classList.add("title");
+  title.innerText = "Error:";
+
+  const what = document.createElement("span");
+  what.classList.add("what");
+  what.innerText = summary;
+
+  const details = document.createElement("p");
+  details.classList.add("details");
+  details.innerText = full;
+
+  const error = document.createElement("div");
+  error.classList.add("error");
+  error.appendChild(title);
+  error.appendChild(document.createTextNode(" "));
+  error.appendChild(what);
+  error.appendChild(details);
+
+  setResult(error);
+}
+
+function showResult(violations) {
+  const count = violations.length;
+  if (count === 0) {
+    const text = document.createElement("span");
+    text.innerText = "No problems detected";
+
+    setResult(text);
+  } else {
+    const title = document.createElement("span");
+    title.classList.add("title");
+    title.innerText = `Found ${count} ${count === 1 ? "problem" : "problems"}`;
+
+    const ul = document.createElement("ul");
+    for (const li of violations.map(htmlEncode.violation)) {
+      ul.appendChild(li);
+    }
+
+    setResult(title, ul);
+  }
+}
+
+function setResult(...children) {
+  const results = document.getElementById("results");
+  const parent = results.parentNode;
+  parent.removeChild(results);
+
+  const newResults = document.createElement("div");
+  newResults.setAttribute("id", "results");
+  for (const child of children) {
+    newResults.appendChild(child);
+  }
+
+  parent.appendChild(newResults);
+}
+
+function main() {
+  window.getSource = getSource;
+  window.showError = showError;
+  window.showResult = showResult;
+
+  input.addEventListener("input", runAnalysis);
+  conservative.addEventListener("click", runAnalysis);
+
+  loadWasm();
+}
+
+main();
diff --git a/wasm_exec.js b/wasm_exec.js
new file mode 100644
index 0000000..bc6f210
--- /dev/null
+++ b/wasm_exec.js
@@ -0,0 +1,561 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+"use strict";
+
+(() => {
+	const enosys = () => {
+		const err = new Error("not implemented");
+		err.code = "ENOSYS";
+		return err;
+	};
+
+	if (!globalThis.fs) {
+		let outputBuf = "";
+		globalThis.fs = {
+			constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
+			writeSync(fd, buf) {
+				outputBuf += decoder.decode(buf);
+				const nl = outputBuf.lastIndexOf("\n");
+				if (nl != -1) {
+					console.log(outputBuf.substring(0, nl));
+					outputBuf = outputBuf.substring(nl + 1);
+				}
+				return buf.length;
+			},
+			write(fd, buf, offset, length, position, callback) {
+				if (offset !== 0 || length !== buf.length || position !== null) {
+					callback(enosys());
+					return;
+				}
+				const n = this.writeSync(fd, buf);
+				callback(null, n);
+			},
+			chmod(path, mode, callback) { callback(enosys()); },
+			chown(path, uid, gid, callback) { callback(enosys()); },
+			close(fd, callback) { callback(enosys()); },
+			fchmod(fd, mode, callback) { callback(enosys()); },
+			fchown(fd, uid, gid, callback) { callback(enosys()); },
+			fstat(fd, callback) { callback(enosys()); },
+			fsync(fd, callback) { callback(null); },
+			ftruncate(fd, length, callback) { callback(enosys()); },
+			lchown(path, uid, gid, callback) { callback(enosys()); },
+			link(path, link, callback) { callback(enosys()); },
+			lstat(path, callback) { callback(enosys()); },
+			mkdir(path, perm, callback) { callback(enosys()); },
+			open(path, flags, mode, callback) { callback(enosys()); },
+			read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
+			readdir(path, callback) { callback(enosys()); },
+			readlink(path, callback) { callback(enosys()); },
+			rename(from, to, callback) { callback(enosys()); },
+			rmdir(path, callback) { callback(enosys()); },
+			stat(path, callback) { callback(enosys()); },
+			symlink(path, link, callback) { callback(enosys()); },
+			truncate(path, length, callback) { callback(enosys()); },
+			unlink(path, callback) { callback(enosys()); },
+			utimes(path, atime, mtime, callback) { callback(enosys()); },
+		};
+	}
+
+	if (!globalThis.process) {
+		globalThis.process = {
+			getuid() { return -1; },
+			getgid() { return -1; },
+			geteuid() { return -1; },
+			getegid() { return -1; },
+			getgroups() { throw enosys(); },
+			pid: -1,
+			ppid: -1,
+			umask() { throw enosys(); },
+			cwd() { throw enosys(); },
+			chdir() { throw enosys(); },
+		}
+	}
+
+	if (!globalThis.crypto) {
+		throw new Error("globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)");
+	}
+
+	if (!globalThis.performance) {
+		throw new Error("globalThis.performance is not available, polyfill required (performance.now only)");
+	}
+
+	if (!globalThis.TextEncoder) {
+		throw new Error("globalThis.TextEncoder is not available, polyfill required");
+	}
+
+	if (!globalThis.TextDecoder) {
+		throw new Error("globalThis.TextDecoder is not available, polyfill required");
+	}
+
+	const encoder = new TextEncoder("utf-8");
+	const decoder = new TextDecoder("utf-8");
+
+	globalThis.Go = class {
+		constructor() {
+			this.argv = ["js"];
+			this.env = {};
+			this.exit = (code) => {
+				if (code !== 0) {
+					console.warn("exit code:", code);
+				}
+			};
+			this._exitPromise = new Promise((resolve) => {
+				this._resolveExitPromise = resolve;
+			});
+			this._pendingEvent = null;
+			this._scheduledTimeouts = new Map();
+			this._nextCallbackTimeoutID = 1;
+
+			const setInt64 = (addr, v) => {
+				this.mem.setUint32(addr + 0, v, true);
+				this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
+			}
+
+			const setInt32 = (addr, v) => {
+				this.mem.setUint32(addr + 0, v, true);
+			}
+
+			const getInt64 = (addr) => {
+				const low = this.mem.getUint32(addr + 0, true);
+				const high = this.mem.getInt32(addr + 4, true);
+				return low + high * 4294967296;
+			}
+
+			const loadValue = (addr) => {
+				const f = this.mem.getFloat64(addr, true);
+				if (f === 0) {
+					return undefined;
+				}
+				if (!isNaN(f)) {
+					return f;
+				}
+
+				const id = this.mem.getUint32(addr, true);
+				return this._values[id];
+			}
+
+			const storeValue = (addr, v) => {
+				const nanHead = 0x7FF80000;
+
+				if (typeof v === "number" && v !== 0) {
+					if (isNaN(v)) {
+						this.mem.setUint32(addr + 4, nanHead, true);
+						this.mem.setUint32(addr, 0, true);
+						return;
+					}
+					this.mem.setFloat64(addr, v, true);
+					return;
+				}
+
+				if (v === undefined) {
+					this.mem.setFloat64(addr, 0, true);
+					return;
+				}
+
+				let id = this._ids.get(v);
+				if (id === undefined) {
+					id = this._idPool.pop();
+					if (id === undefined) {
+						id = this._values.length;
+					}
+					this._values[id] = v;
+					this._goRefCounts[id] = 0;
+					this._ids.set(v, id);
+				}
+				this._goRefCounts[id]++;
+				let typeFlag = 0;
+				switch (typeof v) {
+					case "object":
+						if (v !== null) {
+							typeFlag = 1;
+						}
+						break;
+					case "string":
+						typeFlag = 2;
+						break;
+					case "symbol":
+						typeFlag = 3;
+						break;
+					case "function":
+						typeFlag = 4;
+						break;
+				}
+				this.mem.setUint32(addr + 4, nanHead | typeFlag, true);
+				this.mem.setUint32(addr, id, true);
+			}
+
+			const loadSlice = (addr) => {
+				const array = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				return new Uint8Array(this._inst.exports.mem.buffer, array, len);
+			}
+
+			const loadSliceOfValues = (addr) => {
+				const array = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				const a = new Array(len);
+				for (let i = 0; i < len; i++) {
+					a[i] = loadValue(array + i * 8);
+				}
+				return a;
+			}
+
+			const loadString = (addr) => {
+				const saddr = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
+			}
+
+			const timeOrigin = Date.now() - performance.now();
+			this.importObject = {
+				_gotest: {
+					add: (a, b) => a + b,
+				},
+				gojs: {
+					// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
+					// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
+					// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
+					// This changes the SP, thus we have to update the SP used by the imported function.
+
+					// func wasmExit(code int32)
+					"runtime.wasmExit": (sp) => {
+						sp >>>= 0;
+						const code = this.mem.getInt32(sp + 8, true);
+						this.exited = true;
+						delete this._inst;
+						delete this._values;
+						delete this._goRefCounts;
+						delete this._ids;
+						delete this._idPool;
+						this.exit(code);
+					},
+
+					// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
+					"runtime.wasmWrite": (sp) => {
+						sp >>>= 0;
+						const fd = getInt64(sp + 8);
+						const p = getInt64(sp + 16);
+						const n = this.mem.getInt32(sp + 24, true);
+						fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
+					},
+
+					// func resetMemoryDataView()
+					"runtime.resetMemoryDataView": (sp) => {
+						sp >>>= 0;
+						this.mem = new DataView(this._inst.exports.mem.buffer);
+					},
+
+					// func nanotime1() int64
+					"runtime.nanotime1": (sp) => {
+						sp >>>= 0;
+						setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
+					},
+
+					// func walltime() (sec int64, nsec int32)
+					"runtime.walltime": (sp) => {
+						sp >>>= 0;
+						const msec = (new Date).getTime();
+						setInt64(sp + 8, msec / 1000);
+						this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
+					},
+
+					// func scheduleTimeoutEvent(delay int64) int32
+					"runtime.scheduleTimeoutEvent": (sp) => {
+						sp >>>= 0;
+						const id = this._nextCallbackTimeoutID;
+						this._nextCallbackTimeoutID++;
+						this._scheduledTimeouts.set(id, setTimeout(
+							() => {
+								this._resume();
+								while (this._scheduledTimeouts.has(id)) {
+									// for some reason Go failed to register the timeout event, log and try again
+									// (temporary workaround for https://github.com/golang/go/issues/28975)
+									console.warn("scheduleTimeoutEvent: missed timeout event");
+									this._resume();
+								}
+							},
+							getInt64(sp + 8),
+						));
+						this.mem.setInt32(sp + 16, id, true);
+					},
+
+					// func clearTimeoutEvent(id int32)
+					"runtime.clearTimeoutEvent": (sp) => {
+						sp >>>= 0;
+						const id = this.mem.getInt32(sp + 8, true);
+						clearTimeout(this._scheduledTimeouts.get(id));
+						this._scheduledTimeouts.delete(id);
+					},
+
+					// func getRandomData(r []byte)
+					"runtime.getRandomData": (sp) => {
+						sp >>>= 0;
+						crypto.getRandomValues(loadSlice(sp + 8));
+					},
+
+					// func finalizeRef(v ref)
+					"syscall/js.finalizeRef": (sp) => {
+						sp >>>= 0;
+						const id = this.mem.getUint32(sp + 8, true);
+						this._goRefCounts[id]--;
+						if (this._goRefCounts[id] === 0) {
+							const v = this._values[id];
+							this._values[id] = null;
+							this._ids.delete(v);
+							this._idPool.push(id);
+						}
+					},
+
+					// func stringVal(value string) ref
+					"syscall/js.stringVal": (sp) => {
+						sp >>>= 0;
+						storeValue(sp + 24, loadString(sp + 8));
+					},
+
+					// func valueGet(v ref, p string) ref
+					"syscall/js.valueGet": (sp) => {
+						sp >>>= 0;
+						const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
+						sp = this._inst.exports.getsp() >>> 0; // see comment above
+						storeValue(sp + 32, result);
+					},
+
+					// func valueSet(v ref, p string, x ref)
+					"syscall/js.valueSet": (sp) => {
+						sp >>>= 0;
+						Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
+					},
+
+					// func valueDelete(v ref, p string)
+					"syscall/js.valueDelete": (sp) => {
+						sp >>>= 0;
+						Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16));
+					},
+
+					// func valueIndex(v ref, i int) ref
+					"syscall/js.valueIndex": (sp) => {
+						sp >>>= 0;
+						storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
+					},
+
+					// valueSetIndex(v ref, i int, x ref)
+					"syscall/js.valueSetIndex": (sp) => {
+						sp >>>= 0;
+						Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
+					},
+
+					// func valueCall(v ref, m string, args []ref) (ref, bool)
+					"syscall/js.valueCall": (sp) => {
+						sp >>>= 0;
+						try {
+							const v = loadValue(sp + 8);
+							const m = Reflect.get(v, loadString(sp + 16));
+							const args = loadSliceOfValues(sp + 32);
+							const result = Reflect.apply(m, v, args);
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 56, result);
+							this.mem.setUint8(sp + 64, 1);
+						} catch (err) {
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 56, err);
+							this.mem.setUint8(sp + 64, 0);
+						}
+					},
+
+					// func valueInvoke(v ref, args []ref) (ref, bool)
+					"syscall/js.valueInvoke": (sp) => {
+						sp >>>= 0;
+						try {
+							const v = loadValue(sp + 8);
+							const args = loadSliceOfValues(sp + 16);
+							const result = Reflect.apply(v, undefined, args);
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, result);
+							this.mem.setUint8(sp + 48, 1);
+						} catch (err) {
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, err);
+							this.mem.setUint8(sp + 48, 0);
+						}
+					},
+
+					// func valueNew(v ref, args []ref) (ref, bool)
+					"syscall/js.valueNew": (sp) => {
+						sp >>>= 0;
+						try {
+							const v = loadValue(sp + 8);
+							const args = loadSliceOfValues(sp + 16);
+							const result = Reflect.construct(v, args);
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, result);
+							this.mem.setUint8(sp + 48, 1);
+						} catch (err) {
+							sp = this._inst.exports.getsp() >>> 0; // see comment above
+							storeValue(sp + 40, err);
+							this.mem.setUint8(sp + 48, 0);
+						}
+					},
+
+					// func valueLength(v ref) int
+					"syscall/js.valueLength": (sp) => {
+						sp >>>= 0;
+						setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
+					},
+
+					// valuePrepareString(v ref) (ref, int)
+					"syscall/js.valuePrepareString": (sp) => {
+						sp >>>= 0;
+						const str = encoder.encode(String(loadValue(sp + 8)));
+						storeValue(sp + 16, str);
+						setInt64(sp + 24, str.length);
+					},
+
+					// valueLoadString(v ref, b []byte)
+					"syscall/js.valueLoadString": (sp) => {
+						sp >>>= 0;
+						const str = loadValue(sp + 8);
+						loadSlice(sp + 16).set(str);
+					},
+
+					// func valueInstanceOf(v ref, t ref) bool
+					"syscall/js.valueInstanceOf": (sp) => {
+						sp >>>= 0;
+						this.mem.setUint8(sp + 24, (loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0);
+					},
+
+					// func copyBytesToGo(dst []byte, src ref) (int, bool)
+					"syscall/js.copyBytesToGo": (sp) => {
+						sp >>>= 0;
+						const dst = loadSlice(sp + 8);
+						const src = loadValue(sp + 32);
+						if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) {
+							this.mem.setUint8(sp + 48, 0);
+							return;
+						}
+						const toCopy = src.subarray(0, dst.length);
+						dst.set(toCopy);
+						setInt64(sp + 40, toCopy.length);
+						this.mem.setUint8(sp + 48, 1);
+					},
+
+					// func copyBytesToJS(dst ref, src []byte) (int, bool)
+					"syscall/js.copyBytesToJS": (sp) => {
+						sp >>>= 0;
+						const dst = loadValue(sp + 8);
+						const src = loadSlice(sp + 16);
+						if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) {
+							this.mem.setUint8(sp + 48, 0);
+							return;
+						}
+						const toCopy = src.subarray(0, dst.length);
+						dst.set(toCopy);
+						setInt64(sp + 40, toCopy.length);
+						this.mem.setUint8(sp + 48, 1);
+					},
+
+					"debug": (value) => {
+						console.log(value);
+					},
+				}
+			};
+		}
+
+		async run(instance) {
+			if (!(instance instanceof WebAssembly.Instance)) {
+				throw new Error("Go.run: WebAssembly.Instance expected");
+			}
+			this._inst = instance;
+			this.mem = new DataView(this._inst.exports.mem.buffer);
+			this._values = [ // JS values that Go currently has references to, indexed by reference id
+				NaN,
+				0,
+				null,
+				true,
+				false,
+				globalThis,
+				this,
+			];
+			this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id
+			this._ids = new Map([ // mapping from JS values to reference ids
+				[0, 1],
+				[null, 2],
+				[true, 3],
+				[false, 4],
+				[globalThis, 5],
+				[this, 6],
+			]);
+			this._idPool = [];   // unused ids that have been garbage collected
+			this.exited = false; // whether the Go program has exited
+
+			// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
+			let offset = 4096;
+
+			const strPtr = (str) => {
+				const ptr = offset;
+				const bytes = encoder.encode(str + "\0");
+				new Uint8Array(this.mem.buffer, offset, bytes.length).set(bytes);
+				offset += bytes.length;
+				if (offset % 8 !== 0) {
+					offset += 8 - (offset % 8);
+				}
+				return ptr;
+			};
+
+			const argc = this.argv.length;
+
+			const argvPtrs = [];
+			this.argv.forEach((arg) => {
+				argvPtrs.push(strPtr(arg));
+			});
+			argvPtrs.push(0);
+
+			const keys = Object.keys(this.env).sort();
+			keys.forEach((key) => {
+				argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
+			});
+			argvPtrs.push(0);
+
+			const argv = offset;
+			argvPtrs.forEach((ptr) => {
+				this.mem.setUint32(offset, ptr, true);
+				this.mem.setUint32(offset + 4, 0, true);
+				offset += 8;
+			});
+
+			// The linker guarantees global data starts from at least wasmMinDataAddr.
+			// Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr.
+			const wasmMinDataAddr = 4096 + 8192;
+			if (offset >= wasmMinDataAddr) {
+				throw new Error("total length of command line and environment variables exceeds limit");
+			}
+
+			this._inst.exports.run(argc, argv);
+			if (this.exited) {
+				this._resolveExitPromise();
+			}
+			await this._exitPromise;
+		}
+
+		_resume() {
+			if (this.exited) {
+				throw new Error("Go program has already exited");
+			}
+			this._inst.exports.resume();
+			if (this.exited) {
+				this._resolveExitPromise();
+			}
+		}
+
+		_makeFuncWrapper(id) {
+			const go = this;
+			return function () {
+				const event = { id: id, this: this, args: arguments };
+				go._pendingEvent = event;
+				go._resume();
+				return event.result;
+			};
+		}
+	}
+})();