JarCasting 
resolve-options
Resolve an options object based on configuration.
Usage
// This example assumes a Vinyl file
var createResolver = require('resolve-options');
var config = {
cwd: {
type: 'string',
default: process.cwd
},
sourcemaps: {
type: 'boolean',
default: false
},
since: {
type: ['date', 'number']
},
read: {
type: 'boolean'
}
};
var options = {
sourcemaps: true,
since: Date.now(),
read: function(file) {
return (file.extname !== '.mp4');
}
};
var resolver = createResolver(config, options);
var cwd = resolver.resolve('cwd', file);
// cwd === process.cwd()
var sourcemaps = resolver.resolve('sourcemaps', file);
// sourcemaps === true
var read = resolver.resolve('read', file);
// Given .mp4, read === false
// Given .txt, read === true
API
createResolver([config,] [options])
Takes a config object that describes the options to accept/resolve and an options object (usually passed by a user) to resolve against the config. Returns a resolver that contains a resolve method for realtime resolution of options.
The config object takes the following structure:
config {
[optionKey] {
type // string, array or function
default // any value or function
}
}
Each option is represented by its optionKey in the config object. It must be an object with a type property.
The type property must be a string, array or function which will be passed to the value-or-function module (functions will be bound to the resolver to allow for dependent options).
A default property may also be specified as a fallback if the option isn't available or is invalid. The default value can be any value or a function (functions will be bound to the resolver to allow for dependent defaults). Note: default values are not type-validated by the value-or-function module.
resolver.resolve(optionKey, [...arguments])
Takes an optionKey string and any number of arguments to apply if an option is a function. Returns the resolved value for the optionKey.
License
MIT
