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proposal: template/html: add support for Javascript modules #31600

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odeke-em opened this issue Apr 21, 2019 · 3 comments
Closed

proposal: template/html: add support for Javascript modules #31600

odeke-em opened this issue Apr 21, 2019 · 3 comments
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@odeke-em
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Coming here from https://go-review.googlesource.com/c/go/+/135417/1#message-7dd5e123817a64371e99231b997ff292794e9e33 in which I suggested we create a corresponding issue for posterity and for detailed conversations/discussions

@tomuta submitted PR #27697 and below are details of the PR

What did you do?

template/html does not properly treat javascript code as javascript when using a <script type="module" tag:

<!doctype html>
<html lang="en">
	<head>
		<meta charset="utf-8" />
	</head>
	<body>
	<script type='module'>
		1 <= 2
	</script>
</html>

What did you expect to see?

<!doctype html>
<html lang="en">
	<head>
		<meta charset="utf-8" />
	</head>
	<body>
	<script type='module'>
		1 <= 2
	</script>
</html>

What did you see instead?

<!doctype html>
<html lang="en">
	<head>
		<meta charset="utf-8" />
	</head>
	<body>
	<script type='module'>
		1 &lt;= 2
	</script>
</html>

See also: https://www.w3.org/TR/html5/semantics-scripting.html#element-attrdef-script-type
@gopherbot gopherbot added this to the Proposal milestone Apr 21, 2019
@odeke-em
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@mikesamuel I see you've given a +1 at https://go-review.googlesource.com/c/go/+/135417/1#message-20591718bc2c308ca766ccac27521a70e769f09a
Could you please comment here with your details to aid in the proposal approval process? Thank you!

@mikesamuel
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@odeke-em From #31327 (comment)

@mikesamuel do you have more context on JS modules differences with normal scripts?

There's no significant difference.
A JS ModuleBody is just a strict mode ScriptBody that can also contain import and export declarations.
So I think we can add "module" to https://golang.org/src/html/template/js.go#L390

func isJSType(mimeType string) bool {
        ...
	switch mimeType {
	case
		"application/ecmascript",
                ...
        }
        ...
}

@tomuta

@odeke-em
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Thanks for linking that already created issue @mikesamuel! I'll close this one since it is a duplicate of #31327

@golang golang locked and limited conversation to collaborators Apr 23, 2020
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@mikesamuel @odeke-em @gopherbot