@maizzle/framework/dist/plugins/postcss/pruneVars.js

Maizzle is a framework that helps you quickly build HTML emails with Tailwind CSS.

//#region src/plugins/postcss/pruneVars.ts
const PLUGIN_NAME = "postcss-prune-var";
const VAR_RE = /var\(\s*(--[^ ,);]+)/g;
var pruneVars_default = () => {
	return {
		postcssPlugin: PLUGIN_NAME,
		Once(root) {
			const records = /* @__PURE__ */ new Map();
			const usedVars = /* @__PURE__ */ new Set();
			const getRecord = (name) => {
				let r = records.get(name);
				if (!r) {
					r = {
						uses: 0,
						declarations: /* @__PURE__ */ new Set(),
						dependencies: /* @__PURE__ */ new Set()
					};
					records.set(name, r);
				}
				return r;
			};
			const registerUse = (name, seen = /* @__PURE__ */ new Set()) => {
				const r = getRecord(name);
				r.uses++;
				seen.add(name);
				for (const dep of r.dependencies) if (!seen.has(dep)) registerUse(dep, seen);
			};
			root.walkDecls((decl) => {
				const isVar = decl.prop.startsWith("--");
				if (isVar) getRecord(decl.prop).declarations.add(decl);
				if (!decl.value.includes("var(")) return;
				let m;
				VAR_RE.lastIndex = 0;
				while (m = VAR_RE.exec(decl.value)) {
					const ref = m[1].trim();
					if (isVar) getRecord(decl.prop).dependencies.add(ref);
					else usedVars.add(ref);
				}
			});
			for (const v of usedVars) registerUse(v);
			for (const { uses, declarations } of records.values()) if (uses === 0) for (const decl of declarations) decl.remove();
		}
	};
};
const postcss = true;
//#endregion
export { pruneVars_default as default, postcss };

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