Commit modules

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Federico Grandi
2019-12-14 23:17:51 +01:00
parent 8063b07a5a
commit a88246a48b
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# babel-plugin-transform-undefined-to-void
Some JavaScript implementations allow undefined to be overwritten, this may lead to peculiar bugs that are extremely hard to track down.
This plugin transforms `undefined` into `void 0` which returns undefined regardless of if it's been reassigned.
## Example
**In**
```javascript
foo === undefined;
```
**Out**
```javascript
foo === void 0;
```
## Installation
```sh
npm install babel-plugin-transform-undefined-to-void --save-dev
```
## Usage
### Via `.babelrc` (Recommended)
**.babelrc**
```json
{
"plugins": ["transform-undefined-to-void"]
}
```
### Via CLI
```sh
babel --plugins transform-undefined-to-void script.js
```
### Via Node API
```javascript
require("@babel/core").transform("code", {
plugins: ["transform-undefined-to-void"]
});
```

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"use strict";
module.exports = function ({
types: t
}) {
const VOID_0 = t.unaryExpression("void", t.numericLiteral(0), true);
return {
name: "transform-undefined-to-void",
visitor: {
ReferencedIdentifier(path) {
if (path.node.name === "undefined") {
path.replaceWith(VOID_0);
}
}
}
};
};

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{
"_args": [
[
"babel-plugin-transform-undefined-to-void@6.9.4",
"C:\\EndBug\\GitHub\\add-and-commit"
]
],
"_development": true,
"_from": "babel-plugin-transform-undefined-to-void@6.9.4",
"_id": "babel-plugin-transform-undefined-to-void@6.9.4",
"_inBundle": false,
"_integrity": "sha1-viQcqBQEAwZ4t0hxcyK4nQyP4oA=",
"_location": "/babel-plugin-transform-undefined-to-void",
"_phantomChildren": {},
"_requested": {
"type": "version",
"registry": true,
"raw": "babel-plugin-transform-undefined-to-void@6.9.4",
"name": "babel-plugin-transform-undefined-to-void",
"escapedName": "babel-plugin-transform-undefined-to-void",
"rawSpec": "6.9.4",
"saveSpec": null,
"fetchSpec": "6.9.4"
},
"_requiredBy": [
"/babel-preset-minify"
],
"_resolved": "https://registry.npmjs.org/babel-plugin-transform-undefined-to-void/-/babel-plugin-transform-undefined-to-void-6.9.4.tgz",
"_spec": "6.9.4",
"_where": "C:\\EndBug\\GitHub\\add-and-commit",
"author": {
"name": "amasad"
},
"bugs": {
"url": "https://github.com/babel/minify/issues"
},
"description": "Replace references to `undefined` with `void 0`",
"homepage": "https://github.com/babel/minify#readme",
"keywords": [
"babel-plugin"
],
"license": "MIT",
"main": "lib/index.js",
"name": "babel-plugin-transform-undefined-to-void",
"repository": {
"type": "git",
"url": "https://github.com/babel/minify/tree/master/packages/babel-plugin-transform-undefined-to-void"
},
"version": "6.9.4"
}