@csstools/postcss-progressive-custom-properties/dist/index.mjs

Correctly declare progressive enhancements for CSS Custom Properties.

import e from"postcss-value-parser";const a=["at","bottom","center","circle","closest-corner","closest-side","ellipse","farthest-corner","farthest-side","from","in","left","right","to","top"];function doublePositionGradients(e){const p=[],r=e.value.toLowerCase();if("function"===e.type&&("conic-gradient"===r||"linear-gradient"===r||"radial-gradient"===r||"repeating-conic-gradient"===r||"repeating-linear-gradient"===r||"repeating-radial-gradient"===r)){let r=0,t=!1,i=!1;e:for(let o=0;o<e.nodes.length;o++){const s=e.nodes[o];if("word"===s.type&&a.includes(s.value.toLowerCase())&&(t=!0),"div"!==s.type||","!==s.value.trim())if("word"!==s.type||"in"!==s.value.toLowerCase()){if("word"!==s.type&&"function"!==s.type||r++,i)switch(e.value.toLowerCase()){case"conic-gradient":p.push("(background: conic-gradient(in oklch, red 0deg, red 0deg 1deg, red 2deg))");break e;case"linear-gradient":p.push("(background: linear-gradient(in oklch, red 0%, red 0% 1%, red 2%))");break e;case"radial-gradient":p.push("(background: radial-gradient(in oklch, red, red 1px 2px, red 3px))");break e;case"repeating-conic-gradient":p.push("(background: repeating-conic-gradient(in oklch from 0deg, red 0deg, red 0deg 1deg, red 2deg))");break e;case"repeating-linear-gradient":p.push("(background: repeating-linear-gradient(in oklch, red 0%, red 0% 1%, red 2%))");break e;case"repeating-radial-gradient":p.push("(background: repeating-radial-gradient(in oklch, red, red 1px 2px, red 3px))");break e}if(!t&&3===r)switch(e.value.toLowerCase()){case"conic-gradient":p.push("(background: conic-gradient(red 0deg, red 0deg 1deg, red 2deg))");break e;case"linear-gradient":p.push("(background: linear-gradient(red 0%, red 0% 1%, red 2%))");break e;case"radial-gradient":p.push("(background: radial-gradient(red, red 1px 2px, red 3px))");break e;case"repeating-conic-gradient":p.push("(background: repeating-conic-gradient(from 0deg, red 0deg, red 0deg 1deg, red 2deg))");break e;case"repeating-linear-gradient":p.push("(background: repeating-linear-gradient(red 0%, red 0% 1%, red 2%))");break e;case"repeating-radial-gradient":p.push("(background: repeating-radial-gradient(red, red 1px 2px, red 3px))");break e}}else i=!0;else r=0,t=!1}}return p}const p=[{supports:"color-mix(in lch, red, 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r=p,t=p;for(;e.nodes[r]&&"space"===e.nodes[r].type;)r++;for(;a.nodes[t]&&"space"===a.nodes[t].type;)t++;if(!!e.nodes[r]!=!!a.nodes[t])return!1;if(e.nodes[r].anyRemainingArguments&&a.nodes[t])return!0;if(!matches(e.nodes[r],a.nodes[t]))return!1}return!0}return!0}function doesNotMatchValue(e,a){return("space"!==e.type||"space"!==a.type||e.value?.trim()!==a.value?.trim())&&(e.dimension&&a.dimension?e.dimension.unit!==a.dimension.unit:"string"===e.type?e.value!==a.value:e.value?.toLowerCase()!==a.value?.toLowerCase())}const r=/^var$/i;function conditionsFromValue(a,t=!1){const i=a.value,o=[],s=p.filter((e=>i.includes(e.sniff)&&(e.only_on_property??a.prop)===a.prop));let y=!1;try{e(i).walk((a=>{"function"===a.type&&r.test(a.value)&&(y=!0);try{const p=e.unit(a.value);!1!==p&&(a.dimension=p)}catch{}for(let e=0;e<s.length;e++){const p=s[e];for(let e=0;e<p.matchers.length;e++){if(matches(p.matchers[e],a))return void o.push(`(${p.property}: ${p.supports})`)}}o.push(...doublePositionGradients(a))}))}catch{}return t&&!y?{support:[]}:{support:Array.from(new Set(o)).sort()}}const t=/var\(/i,i=/^initial$/i,o=/^\s*$/,creator=()=>({postcssPlugin:"postcss-progressive-custom-properties",prepare(){const e=new WeakMap;return{postcssPlugin:"postcss-progressive-custom-properties",OnceExit(a,{postcss:p}){a.walkDecls((a=>{if(!a.parent)return;const r=e.get(a.parent)||{conditionalRules:[],propNames:new Set,lastConditionParams:{support:void 0},lastConditionalRule:void 0};if(e.set(a.parent,r),a.variable){if(!r.propNames.has(a.prop))return void r.propNames.add(a.prop)}else{const e=a.prop.toLowerCase();if(!r.propNames.has(e))return void r.propNames.add(e)}if(!a.variable&&!t.test(a.value))return;if(i.test(a.value))return;if(o.test(a.value))return;const s=conditionsFromValue(a,!a.variable).support.join(" and ");if(!s)return;if(r.lastConditionParams.support!==s&&(r.lastConditionalRule=void 0),r.lastConditionalRule)return 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