Rewrite esbuild postcss plugin

Signed-off-by: gearnode <bryan@frimin.fr>

packages/esbuild-plugin-postcss/src/index.mjs

@@ -0,0 +1,52 @@
+import postcss from "postcss";
+import path from "node:path";
+import fs from "node:fs/promises";
+import os from "node:os";
+import process from "node:process";
+
+export default (options = { plugins: [] }) => ({
+  name: "postcss",
+  setup: async function (build) {
+    const { rootDir = options.rootDir || process.cwd() } = options;
+
+    const tmpDirPath = await fs.mkdtemp(
+      path.join(os.tmpdir(), "esbuild-plugin-postcss-"),
+    );
+
+    build.onResolve(
+      { filter: /.\.(css)$/, namespace: "file" },
+      async (args) => {
+        const resolution = await build.resolve(args.path, {
+          resolveDir: args.resolveDir,
+          kind: args.kind,
+        });
+        if (resolution.errors.length > 0) {
+          return { errors: resolution.errors };
+        }
+
+        const sourceFullPath = resolution.path;
+        const sourceExt = path.extname(sourceFullPath);
+        const sourceBaseName = path.basename(sourceFullPath, sourceExt);
+        const sourceDir = path.dirname(sourceFullPath);
+        const sourceRelDir = path.relative(path.dirname(rootDir), sourceDir);
+
+        const tmpDir = path.resolve(tmpDirPath, sourceRelDir);
+        const tmpFilePath = path.resolve(tmpDir, `${sourceBaseName}.css`);
+        await fs.mkdir(tmpDir, { recursive: true });
+
+        const css = await fs.readFile(sourceFullPath);
+        const result = await postcss(options.plugins).process(css, {
+          from: sourceFullPath,
+          to: tmpFilePath,
+        });
+
+        await fs.writeFile(tmpFilePath, result.css);
+
+        return {
+          path: tmpFilePath,
+          watchFiles: [sourceFullPath],
+        };
+      },
+    );
+  },
+});