restructured project (shared-operations)

shared-operations/wasm/pdfcpu/pdfcpu-wrapper-browser.js

@@ -0,0 +1,104 @@
+// imports browserfs via index.html script-tag
+
+let wasmLocation = "/wasm/pdfcpu/";
+
+let fs;
+let Buffer;
+
+// TODO: This can later be defered to load asynchronously
+configureFs();
+loadWasm();
+
+function configureFs() {
+    BrowserFS.configure(
+        {
+            fs: "InMemory",
+        },
+        function (e) {
+            if (e) {
+                // An error happened!
+                throw e;
+            }
+            fs = BrowserFS.BFSRequire("fs");
+            Buffer = BrowserFS.BFSRequire("buffer").Buffer;
+
+            window.fs = fs;
+            window.Buffer = Buffer;
+        }
+    );
+}
+
+function loadWasm() {
+    const script = document.createElement("script");
+    script.src = wasmLocation + "/wasm_exec.js";
+    script.async = true;
+    document.body.appendChild(script);
+}
+
+const runWasm = async (param) => {
+    if (window.cachedWasmResponse === undefined) {
+        const response = await fetch(wasmLocation + "/pdfcpu.wasm");
+        const buffer = await response.arrayBuffer();
+        window.cachedWasmResponse = buffer;
+        window.go = new Go();
+    }
+    const { instance } = await WebAssembly.instantiate(
+        window.cachedWasmResponse,
+        window.go.importObject
+    );
+    window.go.argv = param;
+    await window.go.run(instance);
+    return window.go.exitCode;
+};
+
+async function loadFileAsync(data) {
+    console.log(`Writing file to MemoryFS`);
+    await fs.writeFile(`/input.pdf`, data);
+    console.log(`Write done. Validating...`);
+    let exitcode = await runWasm([
+        "pdfcpu.wasm",
+        "validate",
+        "-c",
+        "disable",
+        `/input.pdf`,
+    ]);
+
+    if (exitcode !== 0)
+        throw new Error("There was an error validating your PDFs");
+
+    console.log(`File is Valid`);
+}
+
+export async function impose(snapshot, nup, format) {
+    
+};
+
+export async function oneToOne(wasmArray, snapshot) {
+    await loadFileAsync(Buffer.from(snapshot));
+
+    console.log("Nuping File");
+    let exitcode = await runWasm(wasmArray);
+
+    if (exitcode !== 0) {
+        console.error("There was an error nuping your PDFs");
+        return;
+    }
+
+    await fs.unlink("input.pdf");
+    const contents = fs.readFileSync("output.pdf");
+    fs.unlink("output.pdf");
+    console.log("Your File ist Ready!");
+    return new Uint8Array(contents);
+}
+
+export async function manyToOne() {
+    //TODO: Do this of neccesary for some operations
+}
+
+export async function oneToMany() {
+    //TODO: Do this of neccesary for some operations
+}
+
+export async function manyToMany() {
+    //TODO: Do this of neccesary for some operations
+}

shared-operations/wasm/pdfcpu/pdfcpu-wrapper-node.js

@@ -0,0 +1,145 @@
+import { WasmFs } from '@wasmer/wasmfs';
+import path from "path";
+
+let webWasmLocation = "/wasm/";
+let nodeWasmLocation = "./public/wasm/";
+
+let fs;
+const wasmfs = new WasmFs();
+
+// TODO: This can later be defered to load asynchronously
+(async () => {
+    await loadWasm();
+    await configureFs();
+})();
+
+async function configureFs() {
+    // Can't use BrowserFS: https://github.com/jvilk/BrowserFS/issues/271
+    fs = wasmfs.fs; 
+    global.fs = fs;
+
+    console.log("InMemoryFs configured");
+}
+
+async function loadWasm() {
+    global.crypto = (await import("crypto")).webcrypto; // wasm dependecy
+    await import("./wasm_exec.js");
+}
+
+const runWasm = async (param) => {
+    if (global.cachedWasmResponse === undefined) {
+        const buffer = (await import("fs")).readFileSync(nodeWasmLocation + "/pdfcpu.wasm");
+        global.cachedWasmResponse = buffer;
+        global.go = new Go();
+    }
+    const { instance } = await WebAssembly.instantiate(
+        global.cachedWasmResponse,
+        global.go.importObject
+    );
+    global.go.argv = param;
+    await global.go.run(instance);
+    return global.go.exitCode;
+};
+
+async function loadFileAsync(data) {
+    console.log(`Writing file to Disk`);
+    fs.writeFileSync(`input.pdf`, data);
+    console.log(`Write done. Validating...`);
+    let exitcode = await runWasm([
+        "pdfcpu.wasm",
+        "validate",
+        "-c",
+        "disable",
+        `input.pdf`,
+    ]);
+    if (exitcode !== 0)
+        throw new Error("There was an error validating your PDFs");
+
+    // // Get logs of command
+    // wasmfs.getStdOut().then(response => {
+    //     console.log(response);
+    // });
+    
+    console.log(`File is Valid`);
+}
+
+export async function oneToOne(wasmArray, snapshot) {
+    await loadFileAsync(Buffer.from(snapshot));
+
+    console.log("Nuping File");
+
+    let exitcode = await runWasm(wasmArray);
+    if (exitcode !== 0) {
+        console.error("There was an error nuping your PDFs");
+        return;
+    }
+    console.log("Nuping Done");
+    
+    await checkExistsWithTimeout("/output.pdf", 1000);
+    console.log("Write started...");
+
+
+    // TODO: Make this more elegant, this waits for the write to finish.
+    // Maybe replace wasmfs with https://github.com/streamich/memfs
+    let fileSize;
+    while (true) {
+        fileSize = fs.statSync("/output.pdf").size;
+        await new Promise((resolve, reject) => {
+            setTimeout(() => {
+                resolve();
+            }, 50);
+        });
+        if(fileSize > 0 && fileSize == fs.statSync("/output.pdf").size) // Wait for file Size not changing anymore.
+            break;
+    }
+    
+    console.log("Could be done?");
+
+    fs.unlinkSync("input.pdf");
+
+    const data = fs.readFileSync("/output.pdf"); 
+    if(data.length == 0) {
+        throw Error("File Size 0 that should not happen. The write probably didn't finish in time.");
+    }
+    fs.unlinkSync("output.pdf");
+    console.log("Your File ist Ready!");
+    return new Uint8Array(data);
+}
+
+export async function manyToOne() {
+    //TODO: Do this if necessary for some pdfcpu operations
+}
+
+export async function oneToMany() {
+    //TODO: Do this if necessary for some pdfcpu operations
+}
+
+export async function manyToMany() {
+    //TODO: Do this if necessary for some pdfcpu operations
+}
+
+// THX: https://stackoverflow.com/questions/26165725/nodejs-check-file-exists-if-not-wait-till-it-exist
+function checkExistsWithTimeout(filePath, timeout) {
+    return new Promise(function (resolve, reject) {
+
+        var timer = setTimeout(function () {
+            watcher.close();
+            reject(new Error('File did not exists and was not created during the timeout.'));
+        }, timeout);
+
+        fs.access(filePath, fs.constants.R_OK, function (err) {
+            if (!err) {
+                clearTimeout(timer);
+                watcher.close();
+                resolve();
+            }
+        });
+
+        var dir = path.dirname(filePath);
+        var watcher = fs.watch(dir, function (eventType, filename) {
+            clearTimeout(timer);
+            watcher.close();
+            resolve();
+        });
+    });
+}

shared-operations/wasm/pdfcpu/wasm_exec.js

@@ -0,0 +1,872 @@
+// 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.
+(() => {
+	// Map multiple JavaScript environments to a single common API,
+	// preferring web standards over Node.js API.
+	//
+	// Environments considered:
+	// - Browsers
+	// - Node.js
+	// - Electron
+	// - Parcel
+	// - Webpack
+
+	console.log("imported")
+	if (typeof global !== "undefined") {
+		// global already exists
+	} else if (typeof window !== "undefined") {
+		window.global = window;
+	} else if (typeof self !== "undefined") {
+		self.global = self;
+	} else {
+		throw new Error("cannot export Go (neither global, window nor self is defined)");
+	}
+
+	let logFS = false
+	var handler = {
+		get: function (target, property) {
+			if (property in target && target[property] instanceof Function) {
+				return function () {
+					if (logFS) {
+						console.log(property, 'called', arguments);
+					}
+					// 将callback替换
+					if (arguments[arguments.length - 1] instanceof Function) {
+						var origCB = arguments[arguments.length - 1];
+						var newCB = function () {
+							if (logFS) {
+								console.log('callback for', property, 'get called with args:', arguments);
+							}
+							return Reflect.apply(origCB, arguments.callee, arguments);
+						}
+						arguments[arguments.length - 1] = newCB;
+					}
+					return Reflect.apply(target[property], target, arguments);
+				}
+			} else {
+				return target[property]
+			}
+		}
+	}
+
+	if (!global.require && typeof require !== "undefined") {
+		global.require = require;
+	}
+
+
+	if (!global.fs && global.require) {
+
+		//const fs = require("fs");
+		if (typeof fs === "object" && fs !== null && Object.keys(fs).length !== 0) {
+			global.fs = fs;
+		}
+
+	}
+
+	const enosys = () => {
+		const err = new Error("not implemented");
+		err.code = "ENOSYS";
+		return err;
+	};
+
+	if (!global.fs) {
+		let outputBuf = "";
+		global.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.substr(0, nl));
+					outputBuf = outputBuf.substr(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 (!global.process) {
+		global.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 (!global.crypto && global.require) {
+		const nodeCrypto = require("crypto");
+		global.crypto = {
+			getRandomValues(b) {
+				nodeCrypto.randomFillSync(b);
+			},
+		};
+	}
+	if (!global.crypto) {
+		throw new Error("global.crypto is not available, polyfill required (getRandomValues only)");
+	}
+
+	if (!global.performance) {
+		global.performance = {
+			now() {
+				const [sec, nsec] = process.hrtime();
+				return sec * 1000 + nsec / 1000000;
+			},
+		};
+	}
+
+	if (!global.TextEncoder && global.require) {
+		global.TextEncoder = require("util").TextEncoder;
+	}
+	if (!global.TextEncoder) {
+		throw new Error("global.TextEncoder is not available, polyfill required");
+	}
+
+	if (!global.TextDecoder && global.require) {
+		global.TextDecoder = require("util").TextDecoder;
+	}
+	if (!global.TextDecoder) {
+		throw new Error("global.TextDecoder is not available, polyfill required");
+	}
+
+
+	const isNodeJS = global.process && global.process.title === "node";
+
+	if (!isNodeJS) {
+		// console.log("ini browser fs")
+		// var myfs = global.BrowserFS.BFSRequire('fs');
+		// global.Buffer = global.BrowserFS.BFSRequire('buffer').Buffer;
+		// global.fs = myfs;
+
+		global.fs.constants = {
+			O_RDONLY: 0,
+			O_WRONLY: 1,
+			O_RDWR: 2,
+			O_CREAT: 64,
+			O_CREATE: 64,
+			O_EXCL: 128,
+			O_NOCTTY: 256,
+			O_TRUNC: 512,
+			O_APPEND: 1024,
+			O_DIRECTORY: 65536,
+			O_NOATIME: 262144,
+			O_NOFOLLOW: 131072,
+			O_SYNC: 1052672,
+			O_DIRECT: 16384,
+			O_NONBLOCK: 2048,
+		};
+
+		let outputBuf = "";
+
+		global.fs.writeSyncOriginal = global.fs.writeSync
+		global.fs.writeSync = function (fd, buf) {
+			if (fd === 1 || fd === 2) {
+				outputBuf += decoder.decode(buf);
+				const nl = outputBuf.lastIndexOf("\n");
+				if (nl != -1) {
+					console.log(outputBuf.substr(0, nl));
+					outputBuf = outputBuf.substr(nl + 1);
+				}
+				return buf.length;
+			} else {
+				return global.fs.writeSyncOriginal(...arguments);
+			}
+		};
+
+		global.fs.writeOriginal = global.fs.write
+		global.fs.write = function (fd, buf, offset, length, position, callback) {
+			// (corresponding to STDOUT/STDERR)
+			if (fd === 1 || fd === 2) {
+				if (offset !== 0 || length !== buf.length || position !== null) {
+					throw new Error("not implemented");
+				}
+				const n = this.writeSync(fd, buf);
+				callback(null, n, buf);
+			} else {
+				// buf: read buf first
+				arguments[1] = global.Buffer.from(arguments[1]);
+				return global.fs.writeOriginal(...arguments);
+			}
+		};
+
+
+
+		global.fs.openOriginal = global.fs.open
+		global.fs.open = function (path, flags, mode, callback) {
+			var myflags = 'r';
+			var O = global.fs.constants;
+
+			// Convert numeric flags to string flags
+			// FIXME: maybe wrong...
+			console.log("open dir?", path, 'flag', flags, myflags)
+			if (flags & O.O_WRONLY) { // 'w'
+				myflags = 'w';
+				if (flags & O.O_EXCL) {
+					myflags = 'wx';
+				}
+			} else if (flags & O.O_RDWR) { // 'r+' or 'w+'
+				if (flags & O.O_CREAT && flags & O.O_TRUNC) { // w+
+					if (flags & O.O_EXCL) {
+						myflags = 'wx+';
+					} else {
+						myflags = 'w+';
+					}
+				} else { // r+
+					myflags = 'r+';
+				}
+			} else if (flags & O.O_APPEND) { // 'a'
+				console.log("append error")
+				throw new Error("Not implmented");
+			} else {
+				// 打开文件
+				myflags = 'r+';
+				console.log("open dir?", path, 'flag', flags, myflags)
+			}
+
+
+			return global.fs.openOriginal(path, myflags, mode, callback);
+		};
+
+		global.fs.fstatOriginal = global.fs.fstat;
+		global.fs.fstat = function (fd, callback) {
+			return global.fs.fstatOriginal(fd, function () {
+				var retStat = arguments[1];
+				delete retStat['fileData'];
+				retStat.atimeMs = retStat.atime.getTime();
+				retStat.mtimeMs = retStat.mtime.getTime();
+				retStat.ctimeMs = retStat.ctime.getTime();
+				retStat.birthtimeMs = retStat.birthtime.getTime();
+				return callback(arguments[0], retStat);
+
+			});
+		};
+
+
+
+		global.fs.closeOriginal = global.fs.close;
+		global.fs.close = function (fd, callback) {
+			return global.fs.closeOriginal(fd, function () {
+				if (typeof arguments[0] === 'undefined') arguments[0] = null;
+				return callback(...arguments);
+			});
+		}
+
+		// global.fs.renameOriginal = global.fs.rename
+		// global.fs.rename = function (from, to, callback) {
+		// 	console.log("rename a0", arguments[0])
+		// 	global.fs.renameOriginal(from, to);
+		// 	callback(arguments[0])
+		// }
+
+		// global.fs.renameSyncOriginal = global.fs.renameSync
+		// global.fs.renameSync = function(fd, options) {
+		// 	console.log("Sync")
+		// }
+
+
+		global.fs = new Proxy(global.fs, handler);
+	}
+
+	// End of polyfills for common API.
+
+	const encoder = new TextEncoder("utf-8");
+	const decoder = new TextDecoder("utf-8");
+
+	global.Go = class {
+		constructor() {
+			this.argv = ["js"];
+			this.env = {};
+			this.exit = (code) => {
+				this.exitCode = 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 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 = {
+				go: {
+					// 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 walltime1() (sec int64, nsec int32)
+					"runtime.walltime1": (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) + 1, // setTimeout has been seen to fire up to 1 millisecond early
+						));
+						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) {
+							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) {
+							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) {
+							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,
+				global,
+				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],
+				[global, 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;
+			});
+
+			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;
+			};
+		}
+	}
+
+	if (
+		typeof module !== "undefined" &&
+		global.require &&
+		global.require.main === module &&
+		global.process &&
+		global.process.versions &&
+		!global.process.versions.electron
+	) {
+		if (process.argv.length < 3) {
+			console.error("usage: go_js_wasm_exec [wasm binary] [arguments]");
+			process.exit(1);
+		}
+
+		const go = new Go();
+		go.argv = process.argv.slice(2);
+		go.env = Object.assign({
+			TMPDIR: require("os").tmpdir()
+		}, process.env);
+		go.exit = process.exit;
+		WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
+			process.on("exit", (code) => { // Node.js exits if no event handler is pending
+				if (code === 0 && !go.exited) {
+					// deadlock, make Go print error and stack traces
+					go._pendingEvent = {
+						id: 0
+					};
+					go._resume();
+				}
+			});
+			return go.run(result.instance);
+		}).catch((err) => {
+			console.error(err);
+			process.exit(1);
+		});
+	}
+})();