Remove custom error usage

README.md

@@ -9,6 +9,7 @@ Make fluent objects like a boss!
 
 ## Core features
 
+- **Zero dependencies**: small footprint.
 - **Protected state**
 - **Undo/Redo out of the box**
 - **Selective mutability**: choose between immutable objects or a classy object.
@@ -377,15 +378,14 @@ const calculator = createBoundCalculator(0)
 console.log(calculator.unwrap()) // Logs '42'
 ```
 
-By default, Fluente still protects the coder from an erroneous unbound call, by throwing a particular error.
+By default, Fluente will throw an 'Unbound call' error when necessary.
 
 ```javascript
 const calculator = createNormalCalculator(0)
 
 try {
   calculator.add.call(null, 1)
 } catch (err) {
-  console.log(err.message) // Logs 'Unbound call'
-  console.log(err.code) // Logs 'FLUENTE_UNBOUND'
+  console.log(err) // Error: Unbound call
 }
 ```

fluente.js

@@ -1,14 +1,12 @@
 'use strict'
 
-const Herry = require('herry')
-
 const stateSymbol = Symbol('fluente')
 
 function getState (obj) {
   if (typeof obj === 'object' && obj !== null && obj.hasOwnProperty(stateSymbol)) {
     return obj[stateSymbol]
   } else {
-    throw new Herry('FLUENTE_UNBOUND', 'Unbound call')
+    throw new Error('Unbound call')
   }
 }
 

fluente.spec.js

@@ -252,11 +252,11 @@ test('binding', t => {
   t.true(a[sym])
   t.throws(
     () => a.next.call(null),
-    { code: 'FLUENTE_UNBOUND' }
+    { message: 'Unbound call' }
   )
   t.throws(
     () => a.unwrap.call(null),
-    { code: 'FLUENTE_UNBOUND' }
+    { message: 'Unbound call' }
   )
 
   let b = fluente({
@@ -294,10 +294,10 @@ test('binding', t => {
   t.true(c[sym])
   t.throws(
     () => c.next.call(null),
-    { code: 'FLUENTE_UNBOUND' }
+    { message: 'Unbound call' }
   )
   t.throws(
     () => c.unwrap.call(null),
-    { code: 'FLUENTE_UNBOUND' }
+    { message: 'Unbound call' }
   )
 })