@jesscss/less-parser

Jess - Less parser

Translates a Less string to a Jess AST.

Ideas

Converting Less 1.x-5.x to Less 6

• Auto-wrap parens around division to dis-ambiguate.
• Convert @import to @use and @include syntax.
• Throw errors on @plugin and ask to refactor with @from
• Convert function references to @from '#less' ([func])
• Add parentheses after mixin calls e.g. .ns > .mixin; to .ns.mixin();
• Convert local imports from @import 'local' to @include './local.less'
• Convert @import (less) './file.css'; to @include './file.css' as less;
• Convert @import (inline) './file.css'; to @include './file.css' as text;
• Convert @import (reference) './file.less'; to @use './file.less';
• Files that consume variables, mixins, or rules (like with extend) should have a @use added.
• Don't allow .class as a value in a declaration. Convert to \.class e.g. @foo: .class should be converted to @foo: \.class (or selector(.class)?).
• In a custom property value, convert @variable to @{variable}.

Converting Less 1.x-4.x to Jess

• Auto-wrap expressions (like math) with $()
• Convert mixin definitions .my-mixin() to @mixin my-mixin()
• Convert mixin calls to function calls: #ns > .mixin() to $ns.mixin()
• Throw errors on mixed case mixins: .my-mixin() and .myMixin()
• Throw errors on mixed hash and class mixins: #my-mixin() and .my-mixin()
• Convert variable declarations @my-var with $my-var
• Convert interpolated vars @{my-var} to $(my-var)
• Convert property references $prop to $[prop]
• Convert color names in expressions to hex values (or wrapped in color()?) (because Jess doesn't support color keywords in expressions). Alternatively, should Jess allow keyword to denote keywords?
• Convert @rest... to ...rest
• Convert .rules() to @include .rules() if .rules is a selector. What if it's a selector and mixin? Maybe something like @include .rules, $rules();? This might change the execution order from Less though.
• Convert @foo: extract(@bar, 1) to @let foo: $bar[0];?