Change npm package to ESM

Author: ije

Cargo.lock

@@ -2,19 +2,15 @@
 members = ["native", "lexer", "wasm"]
 resolver = "2"
 
-[profile.release.package.cjs-module-lexer]
-# optimization for size (more aggressive)
-opt-level = "z"
-
 [profile.release]
+codegen-units = 1
 debug = false
-# optimization for size (more aggressive)
+incremental = false
+lto = true
 opt-level = 3
-# less code to include into binary
 panic = "abort"
 strip = "symbols"
-# optimization over all codebase (better optimization, slower build)
-codegen-units = 1
-# link time optimization using using whole-program analysis
-lto = true
-incremental = false
+
+[profile.release.package.wasm]
+# optimization for size (more aggressive)
+opt-level = "z"

Cargo.toml

@@ -15,7 +15,7 @@ npm i @esm.sh/cjs-module-lexer
 cjs-module-lexer provides a `parse` function that detects the `module.exports` of a commonjs module. The function returns an object with two properties: `exports` and `reexports`. The `exports` property is an array of the exported names, and the `reexports` property is an array of the reexported modules.
 
 ```js
-const { parse } = require("@esm.sh/cjs-module-lexer");
+import { parse } from "@esm.sh/cjs-module-lexer";
 
 // named exports by assignment
 // exports: ["a", "b", "c", "__esModule", "foo"]

README.md

@@ -1,5 +1,5 @@
 [package]
-name = "cjs-module-lexer"
+name = "wasm"
 version = "0.0.0"
 edition = "2021"
 

wasm/Cargo.toml

@@ -2,18 +2,20 @@
 
 A lexer for detecting the `module.exports` of a CJS module, written in Rust.
 
-## Usage
+## Installation
 
-cjs-module-lexer currently only supports Node.js environment. You can install it via npm CLI:
+You can install cjs-module-lexer via npm CLI:
 
 ```bash
 npm i @esm.sh/cjs-module-lexer
 ```
 
+## Usage
+
 cjs-module-lexer provides a `parse` function that detects the `module.exports` of a commonjs module. The function returns an object with two properties: `exports` and `reexports`. The `exports` property is an array of the exported names, and the `reexports` property is an array of the reexported modules.
 
 ```js
-const { parse } = require("@esm.sh/cjs-module-lexer");
+import { parse } from "@esm.sh/cjs-module-lexer";
 
 // named exports by assignment
 // exports: ["a", "b", "c", "__esModule", "foo"]
@@ -144,19 +146,3 @@ export function parse(
   reexports: string[],
 };
 ```
-
-## Development Setup
-
-You will need [rust](https://www.rust-lang.org/tools/install) 1.56+ and [wasm-pack](https://rustwasm.github.io/wasm-pack/installer/).
-
-## Build
-
-```bash
-wasm-pack build --target nodejs
-```
-
-## Run tests
-
-```bash
-cargo test --all
-```

wasm/README.md

@@ -0,0 +1,35 @@
+import { initSync, parse as __wbg_parse } from "./pkg/cjs-module-lexer.js";
+const wasmPath = "./pkg/cjs-module-lexer_bg.wasm";
+
+let wasm;
+if (globalThis.process || globalThis.Deno || globalThis.Bun) {
+  const { readFileSync } = await import("node:fs");
+  const url = new URL(wasmPath, import.meta.url);
+  const wasmData = readFileSync(url.pathname);
+  wasm = await WebAssembly.compile(wasmData);
+} else {
+  const url = new URL(wasmPath, import.meta.url);
+  const pkgPrefix = "/@esm.sh/cjs-module-lexer@";
+  if (url.pathname.startsWith(pkgPrefix)) {
+    const version = url.pathname.slice(pkgPrefix.length).split("/", 1)[0];
+    url.pathname = pkgPrefix + version + wasmPath.slice(1);
+  }
+  const res = await fetch(url);
+  if (!res.ok) {
+    throw new Error(`failed to fetch wasm: ${res.statusText}`);
+  }
+  wasm = await WebAssembly.compileStreaming(res);
+}
+
+initSync({ module: wasm });
+
+/**
+ * parse the given code and return the exports and reexports
+ * @param {string} filename
+ * @param {string} code
+ * @param {{ nodeEnv?: 'development' | 'production', callMode?: boolean }} options
+ * @returns {{ exports: string[], reexports: string[] }}
+ */
+export function parse(filename, code, options = {}) {
+  return __wbg_parse(filename, code, options);
+}

wasm/index.mjs

@@ -2,15 +2,16 @@
   "name": "@esm.sh/cjs-module-lexer",
   "description": "A lexer for detecting the `module.exports` of a CJS module.",
   "version": "1.0.2",
-  "main": "./pkg/cjs_module_lexer.js",
-  "types": "./pkg/cjs_module_lexer.d.ts",
+  "type": "module",
+  "main": "index.mjs",
   "scripts": {
-    "prepublishOnly": "wasm-pack build --target nodejs"
+    "prepublishOnly": "wasm-pack build --target web --out-name cjs-module-lexer",
+    "test": "node test.mjs"
   },
   "files": [
-    "./pkg/cjs_module_lexer_bg.wasm",
-    "./pkg/cjs_module_lexer.js",
-    "./pkg/cjs_module_lexer.d.ts"
+    "./index.mjs",
+    "./pkg/cjs-module-lexer_bg.wasm",
+    "./pkg/cjs-module-lexer.js"
   ],
   "repository": {
     "type": "git",

wasm/package.json

@@ -0,0 +1,10 @@
+import { parse } from "./index.mjs";
+
+console.log(parse("test.cjs", `
+  exports.a = "a";
+  module.exports.b = "b";
+  Object.defineProperty(exports, "c", { value: 1 });
+  Object.defineProperty(module.exports, "__esModule", { value: true })
+  const key = "foo"
+  Object.defineProperty(exports, key, { value: "e" });
+`));