lasso-babel-transform

Lasso.js transform that uses Babel to transpile ES6 code to ES5.

Prerequisites

This transform requires Lasso v2+

Installation

> lasso 2.x/3.x, babel 7.x, lasso-babel-transform 2.x
``bash
npm install lasso-babel-transform @babel/core
`

> lasso 2.x/3.x, babel 6.x, lasso-babel-transform 1.x
`bash
npm install lasso-babel-transform@1
`

Usage

By default, this plugin will look for a .babelrc while traversing up the root directory of the packages and
will transpile any files that have the .js or .es6 extension. If a .babelrc file does not exist, it
will attempt to look for a .babelrc-browser file. If neither of those files exist, this plugin will look in
the package.json for a babel property.

You can specify different file extensions with the extensions option in the transform's config (shown below).

`javascript
require('lasso').configure({
require: {
transforms: [
{
transform: 'lasso-babel-transform',
config: {
extensions: ['.js', '.es6'] // Enabled file extensions. Default: ['.js', '.es6']
}
}
]
}
});
`

$3

Alternatively, babel options can be provided directly via the config. Note: Specifying babel options directly
will cause all files to be transpiled with these options (regardless of what is specified in the package's .babelrc,
.babelrc-browser, or babel property in the package.json).

`javascript
require('lasso').configure({
require: {
transforms: [
{
transform: 'lasso-babel-transform',
config: {
// directly specify babel options
babelOptions: {
presets: [ "@babel/preset-env" ]
}
}
}
]
}
});
`

Configuring Babel

You will want to put a .babelrc or .babelrc-browser file at the root of each package that has any JavaScript files that should
be transpiled by Babel. For example:

_my-module/.babelrc:_

`
{
"exclude": ["excluded/**"],
"presets": [ "@babel/preset-env" ]
}
`

As mentioned above, you can also opt to use the babel property to the package.json.

_my-module/package.json:_
`
{
"name": "my-module",
...
"babel": {
// babel config goes here
}
}
`

You will need to install any Babel plugins enabled in your babel config. For example:

`bash
npm install @babel/preset-env --save
``