Support React Native by adding a shim for AssertionError

Co-authored-by: Mark Wubben <[email protected]>

Author: normanzb

AssertionError.js

@@ -0,0 +1 @@
+module.exports = require('assert').AssertionError

AssertionError.native.js

@@ -0,0 +1,10 @@
+// Enable use in React Native by shimming the Node.js AssertionError.
+
+class AssertionError extends Error {
+  constructor ({ message }) {
+    super(message)
+    this.name = 'AssertionError'
+  }
+}
+
+module.exports = AssertionError

index.js

@@ -1,5 +1,5 @@
 'use strict'
-const { AssertionError } = require('assert')
+const AssertionError = require('./AssertionError')
 
 function never (message = 'Unexpected call to never()') {
   throw new AssertionError({ message, stackStartFn: never })

package.json

@@ -10,15 +10,18 @@
   "types": "index.d.ts",
   "files": [
     "index.d.ts",
-    "index.js"
+    "index.js",
+    "AssertionError.js",
+    "AssertionError.native.js"
   ],
   "scripts": {
     "test": "standard && tsd && nyc ava"
   },
   "keywords": [
     "never",
     "typescript",
-    "assert"
+    "assert",
+    "react-native"
   ],
   "author": "Mark Wubben (https://novemberborn.net/)",
   "license": "ISC",

test.js

@@ -2,6 +2,7 @@
 const { AssertionError } = require('assert')
 const test = require('ava')
 const never = require('.')
+const ShimmedAssertionError = require('./AssertionError.native')
 
 test('throws when called', t => {
   t.throws(never, { instanceOf: AssertionError })
@@ -22,3 +23,13 @@ test('never() is not in the error stack', t => {
   const error = t.throws(wrapper)
   t.regex(error.stack.split('\n')[1], /wrapper/)
 })
+
+test('the shimmed AssertionError can be constructed', t => {
+  const error = t.throws(() => {
+    throw new ShimmedAssertionError({ message: 'Error message' })
+  }, {
+    instanceOf: ShimmedAssertionError,
+    message: 'Error message'
+  })
+  t.is(error.name, 'AssertionError')
+})