feat!: move to esm and drop support for vue 2.6

scripts/postinstall.mjs

@@ -0,0 +1,57 @@
+import { readFileSync, writeFileSync } from "node:fs";
+import { resolvePath } from "./utils.mjs";
+
+function resolveDist(...paths) {
+  return resolvePath(import.meta.url, "../dist", ...paths);
+}
+
+const typesSource = {
+  3: "index.vue3.d.ts",
+  2: "index.vue2.d.ts"
+};
+
+const typesTargets = [
+  "index.d.ts",
+  "index.d.cts",
+  "csp/index.d.ts",
+  "csp/index.d.cts"
+];
+
+function switchVersion(version) {
+  const source = typesSource[version];
+  const content = readFileSync(resolveDist(source), "utf8");
+
+  typesTargets.forEach(target => {
+    writeFileSync(resolveDist(target), content, "utf8");
+  });
+
+  console.log(`[vue-echarts] Switched to Vue ${version} environment.`);
+}
+
+async function loadVue() {
+  try {
+    const Vue = await import("vue");
+    return Vue;
+  } catch (e) {
+    return null;
+  }
+}
+
+async function main() {
+  const Vue = await loadVue();
+
+  // Align the process with vue-demi
+  if (!Vue || typeof Vue.version !== "string") {
+    console.warn(
+      '[vue-echarts] Vue is not found. Please run "npm install vue" to install.'
+    );
+  } else if (Vue.version.startsWith("3.")) {
+    switchVersion(3);
+  } else if (Vue.version.startsWith("2.7.")) {
+    switchVersion(2);
+  } else {
+    console.warn(`[vue-echarts] Vue version v${Vue.version} is not supported.`);
+  }
+}
+
+main();