Lets you spy on a chain
npm install chain-spy> Lets you spy on a chain
``
$ npm install chain-spy
`js
import { create } from 'chain-spy'
function select(db) {
return db
.select('id', 'name', 'age')
.where('name', 'Daenerys')
.sort('age')
.someFunction(5)
}
const dbProxy = create({ someFunction: n => n })
const result = select(dbProxy)
console.log(result)
// 5
console.log(dbProxy.__execution_log__)
// [ { type: 'get', name: 'select' },
// { type: 'apply', args: [ 'id', 'name', 'age' ] },
// { type: 'get', name: 'where' },
// { type: 'apply', args: [ 'name', 'Daenerys' ] },
// { type: 'get', name: 'sort' },
// { type: 'apply', args: [ 'age' ] } ]
// { type: 'get', name: 'someFunction' },
// { type: 'apply', args: [ 5 ] } ]
// Can be used with snapshot testing, eg.
expect(dbProxy.__execution_log__).toMatchSnapshot() // jest
t.snapshot(dbProxy.__execution_log__); // ava
`
#### overwrite (optional)
Type: object
Can overwrite the return value of a property. eg.
`js
const proxy = create({ hello: 'world', cat: n => n + 1 })
proxy.hello // world
proxy.something.hello // world
proxy.something('else').hello // world
proxy.cat(1) // 2
`
Can also access the proxy inside a overwrite function:
`js
const proxy = create({ hello: function(n) {
return n === 5 ? 7 : this
}})
proxy.hello(1).hello(2).hello(5) // 7
``
MIT