v1.0.0

Author: iTonyYo

.gitignore

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+/CVS/*
+**/CVS/*
+.cvsignore
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+
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+Terms

.npmrc

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+depth=0
+loglevel=notice
+engine-strict=true
+fetch-retries=3
+fetch-retry-mintimeout=5
+save=true
+
+package-lock=true
+
+scope=@iyowei
+@iyowei:registry="https://registry.npmjs.org/"
+
+registry="https://registry.npmmirror.com"

README.md

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+[node version badge]: https://img.shields.io/badge/node.js-%3E%3D12.20.0-brightgreen?style=flat&logo=Node.js
+[download node.js]: https://nodejs.org/en/download/
+[prs welcome badge]: https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat
+
+# isESM(path)
+
+> 通过 AST 检测 JS 文件是不是 ESM，并非读取 "package.json " 文件中 "type" 设置。
+
+## 使用
+
+- `path`，{ String }，路径
+
+```js
+import { log } from "console";
+import { isESM, isESMSync } from "@iyowei/is-esm";
+
+(async () => {
+  log(await isESM("/Users/iyowei/Development/iyowei/create-esm/src/print.js")); // 异步
+  // true
+
+  log(isESMSync("/Users/iyowei/Development/iyowei/create-esm/src/print.js")); // 串行
+  // true
+})();
+```
+
+## 安装
+
+[![Node Version Badge][node version badge]][download node.js]
+
+```shell
+# Pnpm
+pnpm add @iyowei/is-esm
+
+# yarn
+yarn add @iyowei/is-esm
+
+# npm
+npm add @iyowei/is-esm
+```
+
+## 参与贡献
+
+![PRs Welcome][prs welcome badge]

isESM.js

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+import { readFile, readFileSync } from "fs";
+
+import Walker from "node-source-walk";
+import types from "ast-module-types";
+
+export function isESM(path) {
+  return new Promise((resolve, reject) => {
+    readFile(path, "utf-8", (err, file) => {
+      if (err) {
+        reject(err);
+        return;
+      }
+
+      resolve(walk(file));
+    });
+  });
+}
+
+export function isESMSync(path) {
+  return walk(readFileSync(path, "utf-8"));
+}
+
+function walk(source) {
+  const WALKER = new Walker();
+  let result = false;
+
+  let hasES6Import = false;
+  let hasES6Export = false;
+  let hasDynamicImport = false;
+
+  function esmDetector(node) {
+    if (types.isAMDDriverScriptRequire(node)) {
+      hasAMDTopLevelRequire = true;
+    }
+
+    if (types.isES6Import(node)) {
+      hasES6Import = true;
+    }
+
+    if (types.isES6Export(node)) {
+      hasES6Export = true;
+    }
+
+    if (hasES6Import || hasES6Export || hasDynamicImport) {
+      result = true;
+      WALKER.stopWalking();
+      return;
+    }
+  }
+
+  WALKER.walk(source, esmDetector);
+
+  return result;
+}