Inline variables into template strings during minification

[benmccann]

The Svelte 5 compiler output will make heavy use of template strings. I'm looking at what it would be like to use oxc as part of our build process and one thing I noticed is that there are values that are not inlined that could be when using mangle and compress

Example:

const o = 'o';
const d = 'd';
const boolean = false;
var frag = `<p autocapitalize="${`w${o}r${d}s`}" contenteditable="${boolean}"> </p>`;

Today this outputs:

const o = 'o', d = 'd', boolean =  !1;
var frag = `<p autocapitalize="${`w${o}r${d}s`}" contenteditable="${boolean}"> </p>`;

But it could output:

var frag = `<p autocapitalize="words" contenteditable="false"> </p>`;

[rzvxa]

It could also be related to what we discussed about removing assignments here, With only assignment reduction added in it would output something like this:

var frag = `<p autocapitalize="${`w${'o'}r${'d'}s`}" contenteditable="${!1}"> </p>`;

Which already has one less statement, A constant evaluation pass could then be run after this process that would concat the constant strings and eval other literals, In theory, it should output this:

var frag = `<p autocapitalize="${`w${'o'}r${'d'}s`}" contenteditable="${false}"> </p>`;

Then it would need a pass that will reduce interpolations containing constants to normal strings.

var frag = `<p autocapitalize="${`words`}" contenteditable="false"> </p>`;

We may want to do it recursively to get rid of all nested situations but it wouldn't result in a linear time.

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Edit

Maybe an inline-depth flag could come in handy to allow configuration for the recursion limit.

[Boshen]

We don't have the bandwidth to work on the minifier right now, we'll revisit this when we are able to.

[benmccann]

We don't have the bandwidth to work on the minifier right now, we'll revisit this when we are able to.

I just wanted to check in quickly to see if work on the minifier has begun or is on the roadmap? Thanks!

[Boshen]

We don't have the bandwidth to work on the minifier right now, we'll revisit this when we are able to.

I just wanted to check in quickly to see if work on the minifier has begun or is on the roadmap? Thanks!

Not yet. We are still working on the transformer.