README

# Schema Utils

## Install

npm i schema-utils

## Usage

### <tt>validateOptions</tt>

**`schema.json`**

{
"type": "object",
"properties": {
// Options...
},
"additionalProperties": false
}

#### Error Messages (Custom)

**`schema.json`**

{
"type": "object",
"properties": {
"option": {
"type": [ "boolean" ]
}
},
// Overrides the default err.message for option
"errorMessage": {
"option": "should be {Boolean} (https:/github.com/org/repo#anchor)"
}
"additionalProperties": false
}
import schema from 'path/to/schema.json'
import validateOptions from 'schema-utils'
validateOptions(schema, options, 'Loader/Plugin Name')

## Examples

schema.json

{
"type": "object",
"properties": {
"name": {
"type": "string"
},
"test": {
"anyOf": [
{ "type": "array" },
{ "type": "string" },
{ "instanceof": "RegExp" }
]
},
"transform": {
"instanceof": "Function"
},
"sourceMap": {
"type": "boolean"
}
},
"additionalProperties": false
}

### <tt>Loader</tt>

import { getOptions } from 'loader-utils'
import validateOptions from 'schema-utils'
import schema from 'path/to/schema.json'
function loader (src, map) {
const options = getOptions(this) || {}
validateOptions(schema, options, 'Loader Name')
// Code...
}

### <tt>Plugin</tt>

import validateOptions from 'schema-utils'
import schema from 'path/to/schema.json'
class Plugin {
constructor (options) {
validateOptions(schema, options, 'Plugin Name')
this.options = options
}
apply (compiler) {
// Code...
}
}