Tagged templates are not compressed

[denyaalt]

Bug report or Feature request?
Bug report

Version (complete output of terser -V or specific git commit)
terser 5.6.0

Complete CLI command or minify() options used

{
  compress: {},
  mangle: {},
  output: {},
  parse: {},
  rename: {},
}

terser input

result=template();
function template()
{ 	
    return html`
    <div class="parent">
    	<div class="child">${set}</div>
    </div>`;
}

terser output

Tagged templates are not compressed:

result=html`
    <div class="parent">
    	<div class="child">${set}</div>
    </div>`;

Expected result

result=html`\n\t<div class="parent">\n\t\t<div class="child">${set}</div>\n\t</div>`;

[Conduitry]

There's no reasonable way for Terser to know that whitespace can be collapsed in this particular string.

[denyaalt]

If you remove the html tag, then the terser changes the string.
Why doesn't anything change with the html tag?

terser input (without tag literals)

result=template();
function template()
{ 	
	return `
	<div class="parent">
		<div class="child">${set}</div>
	</div>`;
}

terser output (result OK)

result=`\n\t<div class="parent">\n\t\t<div class="child">${set}</div>\n\t</div>`;

[developit]

Terser can't inline html because it's a function call you're importing from an external module. It has unknown side effects.