I'm suspecting that go mod gets confused from a previously reverted v2.3.7 release, so just in case this is a new release that will hopefully fix:

$ go get -u github.com/tdewolff/minify/v2
go: github.com/tdewolff/minify/v2@v2.3.7: go.mod has non-.../v2 module path "github.com/tdewolff/minify" (and .../v2/go.mod does not exist) at revision v2.3.7
go get: error loading module requirements

Add Go modules support by using the github.com/tdewolff/minify/v2 import path.

Important: default mimetype for JavaScript is now application/javascript (it used to be text/javascript).

• HTML bugfix: keep empty value attribute on <input type="radio">, because the default is not an empty string
• HTML bugfix: prevent IE conditional comments from panicking in some instances
• CSS: handle local() for URLs
• CSS: support rgb() and hsl() with spaces instead of commas
• CSS: improve minification for font, background, background-position, background-repeat, background-size, outline and border declarations
• CSS: reintroduce support for IE star-declaration hack
• CSS bugfix: margin and padding now check if values that are functions (such as calc()) are equal and thus eligible for collapsing
• CSS bugfix: parse bad declarations better
• CSS bugfix: add space for attribute selector case insensitivity between the value and i as in input[type="radio" i]
• CSS bugfix: do not collapse outline to 0 but to none
• CSS bugfix: opacity for rgba() and hsla() in CSS2 cannot be rewritten as #rrggbbaa
• SVG bugfix: only use the first pair of coordinates for M to move back to when encountering Z

• CLI: Add bash completion for the minify command
• CLI: improved error messages
• CLI bugfix: don't open all files at once when concatenating, which usually panics when >10000 files are open
• CLI bugfix: don't minify modified files twice when watching them
• Bugfix: prevent panic on long decimals with negative exponent, where rewriting would previously cause longer numbers
• HTML: accept alternative syntax for MS conditional comments
• HTML bugfix: draggable is not a boolean
• HTML bugfix: do not assume mediatype in <meta content="x">
• CSS: add option for CSS2 numbers without exponents
• CSS: trim space in url()
• CSS: minify box-shadow, background and @import better
• CSS bugfix: prevent panic for functions with no arguments or end parenthesis
• CSS bugfix: keep dimensions for zeros in flex property
• CSS bugfix: keep other values for outline and border when width is zero
• CSS bugfix: font normal now handled
• CSS bugfix: add quotes to unquotes url() when we can remove the url function
• CSS bugfix: only omit number dimensions for and
• JS bugfix: ASI behaviour for template literals
• JS bugfix: replace comment as space when comment is removed
• JS bugfix: divide by regular expression
• SVG: don't remove empty groups anymore, as CSS or JS might rely on them
• SVG bugfix: prevent panic on invalid pathdata for arcs