29a2878973
* [skip ci] use markdown jsonc to parse comments in README files * [skip ci] change json to jsonc type in other markdown files
60 lines
1.0 KiB
Markdown
60 lines
1.0 KiB
Markdown
# @babel/plugin-codemod-optional-catch-binding
|
|
|
|
> If the argument bound to the catch block is not referenced in the catch block, that argument and the catch binding is removed.
|
|
|
|
|
|
## Examples
|
|
|
|
```js
|
|
try {
|
|
throw 0;
|
|
} catch (err) {
|
|
console.log("it failed, but this code executes");
|
|
}
|
|
```
|
|
Is transformed to:
|
|
|
|
```js
|
|
try {
|
|
throw 0;
|
|
} catch {
|
|
console.log("it failed, but this code executes");
|
|
}
|
|
```
|
|
|
|
## Installation
|
|
|
|
```sh
|
|
npm install --save-dev @babel/plugin-codemod-optional-catch-binding
|
|
```
|
|
|
|
## Usage
|
|
|
|
### Via `.babelrc` (Recommended)
|
|
|
|
**.babelrc**
|
|
|
|
```jsonc
|
|
{
|
|
"plugins": ["@babel/plugin-codemod-optional-catch-binding"]
|
|
}
|
|
```
|
|
|
|
### Via CLI
|
|
|
|
```sh
|
|
babel --plugins @babel/plugin-codemod-optional-catch-binding script.js
|
|
```
|
|
|
|
### Via Node API
|
|
|
|
```javascript
|
|
require("@babel/core").transform("code", {
|
|
plugins: ["@babel/plugin-codemod-optional-catch-binding"]
|
|
});
|
|
```
|
|
|
|
## References
|
|
This codemod updates your source code in line with the following proposal:
|
|
- [Proposal: Optional Catch Binding for ECMAScript](https://github.com/babel/proposals/issues/7)
|