91 lines
3.2 KiB
Markdown
91 lines
3.2 KiB
Markdown
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# node-retrieve-globals
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Execute a string of JavaScript using Node.js and return the global variable values and functions.
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* Supported on Node.js 16 and newer.
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* Uses `var`, `let`, `const`, `function`, Array and Object [destructuring assignment](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment).
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* Async-only as of v5.0.
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* Can return any valid JS data type (including functions).
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* Can provide an external data object as context to the local execution scope
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* Transforms ESM import statements to work with current CommonJS limitations in Node’s `vm`.
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* Uses [Node’s `vm` module to execute JavaScript](https://nodejs.org/api/vm.html#vmruninthiscontextcode-options)
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* ⚠️ The `node:vm` module is not a security mechanism. Do not use it to run untrusted code.
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* `codeGeneration` (e.g. `eval`) is disabled by default; use `setCreateContextOptions({codeGeneration: { strings: true, wasm: true } })` to re-enable.
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* Works _with or without_ `--experimental-vm-modules` flag (for `vm.Module` support). _(v5.0.0 and newer)_
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* Future-friendly feature tests for when `vm.Module` is stable and `--experimental-vm-modules` is no longer necessary. _(v5.0.0 and newer)_
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* In use on:
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* [JavaScript in Eleventy Front Matter](https://www.11ty.dev/docs/data-frontmatter-customize/#example-use-javascript-in-your-front-matter) (and [Demo](https://github.com/11ty/demo-eleventy-js-front-matter))
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* [WebC’s `<script webc:setup>`](https://www.11ty.dev/docs/languages/webc/#using-java-script-to-setup-your-component)
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## Installation
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Available on [npm](https://www.npmjs.com/package/node-retrieve-globals)
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```
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npm install node-retrieve-globals
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```
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## Usage
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Works from Node.js with ESM and CommonJS:
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```js
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import { RetrieveGlobals } from "node-retrieve-globals";
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// const { RetrieveGlobals } = await import("node-retrieve-globals");
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```
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And then:
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```js
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let code = `var a = 1;
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const b = "hello";
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function hello() {}`;
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let vm = new RetrieveGlobals(code);
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await vm.getGlobalContext();
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```
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Returns:
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```js
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{ a: 1, b: "hello", hello: function hello() {} }
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```
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### Pass in your own Data and reference it in the JavaScript code
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```js
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let code = `let ref = myData;`;
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let vm = new RetrieveGlobals(code);
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await vm.getGlobalContext({ myData: "hello" });
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```
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Returns:
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```js
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{ ref: "hello" }
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```
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### Advanced options
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```js
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// Defaults shown
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let options = {
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reuseGlobal: false, // re-use Node.js `global`, important if you want `console.log` to log to your console as expected.
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dynamicImport: false, // allows `import()`
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addRequire: false, // allows `require()`
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experimentalModuleApi: false, // uses Module#_compile instead of `vm` (you probably don’t want this and it is bypassed by default when vm.Module is supported)
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};
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await vm.getGlobalContext({}, options);
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```
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## Changelog
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* `v6.0.0` Changes `import` and `require` to be project relative (not relative to this package on the file system).
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* `v5.0.0` Removes sync API, swap to async-only. Better compatibility with `--experimental-vm-modules` Node flag.
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* `v4.0.0` Swap to use `Module._compile` as a workaround for #2 (Node regression with experimental modules API in Node v20.10+)
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* `v3.0.0` ESM-only package. Node 16+
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