progfay/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Error.prototype.stack の今と未来


私たちが普段の開発で何気なく見ている Error の stack trace は実は標準化されていません。
このトークでは Error.prototype.stack について、各 JavaScript Runtime の実装と、これを標準化しようとする動きを紹介します。

https://jsconf.jp/2025/en/talks/error-prototype-stack
資料: https://speakerdeck.com/progfay/error-dot-prototype-dot-stack-nojin-towei-lai
資料内リンク集

MDN


Error.prototype.stack - JavaScript | MDN

V8


v8/src/execution/messages.cc at 5ac61190087feaa7fda2284f9f06e227141444ee · v8/v8
Stack trace API · V8
v8/src/execution/messages.cc at 740213e7e48558f16b6842bb74be0086ac2980d2 · v8/v8
v8/src/builtins/accessors.cc at 740213e7e48558f16b6842bb74be0086ac2980d2 · v8/v8

Node.js


node/lib/internal/errors.js at 622c3721bf61e0bda825bed821e316e19ba75eff · nodejs/node

JSC


WebKit/Source/JavaScriptCore/interpreter/Interpreter.cpp at 66754d9a9c19aa6402c09970adc0191c460980cc · WebKit/WebKit
WebKit/Source/JavaScriptCore/runtime/StackFrame.cpp at 66754d9a9c19aa6402c09970adc0191c460980cc · WebKit/WebKit

Bun


bun/src/bun.js/bindings/FormatStackTraceForJS.cpp at 0db90b25261d4379103a4574e722362ed52a31cc · oven-sh/bun
Bun on X: "In the next version of Bun & JavaScriptCore async functions show up in stack traces, thanks to @__sosukesuzuki https://t.co/i5CjzUUZ7e" / X

SpiderMonkey


JS::BuildStackString (SavedStacks.cpp - mozsearch) - 45e3c8634099e0f57fa0e7660dba85580a5dd8e7
JS::FormatSpiderMonkeyStackFrame (SavedStacks.cpp - mozsearch) - 45e3c8634099e0f57fa0e7660dba85580a5dd8e7

TC39


tc39/proposal-error-stacks - GitHub
notes/meetings/2024-12/december-05.md at 3bb70e4b6745798dc145be6859c92a7a0b6d0100 · tc39/notes
tc39/proposal-error-stack-accessor - GitHub
Spec - Error Stack Accessor


## index.html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
    <textarea readonly id="output" rows="10" cols="100"></textarea>
  <script src="./index.js"></script>
</body>
</html>

## index.js
function foo() {
  bar();
}

function bar() {
  baz();
}

function baz() {
  const e = new Error("This is error message");

  if (typeof window === "undefined") {
    console.log(e.stack);
  } else {
    document.getElementById("output").value = e.stack;
  }
}

foo();
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Document</title>
	</head>
	<body>
	<textarea readonly id="output" rows="10" cols="100"></textarea>
	<script src="./index.js"></script>
	</body>
	</html>
	function foo() {
	bar();
	}

	function bar() {
	baz();
	}

	function baz() {
	const e = new Error("This is error message");

	if (typeof window === "undefined") {
	console.log(e.stack);
	} else {
	document.getElementById("output").value = e.stack;
	}
	}

	foo();