Add TypeScript definition (#2)

.gitattributes

@@ -1,2 +1 @@
-* text=auto
-*.js text eol=lf
+* text=auto eol=lf

.travis.yml

@@ -1,3 +1,4 @@
 language: node_js
 node_js:
+  - '10'
   - '8'

index.d.ts

@@ -0,0 +1,14 @@
+/**
+List of words for making random mnemonic sentences.
+
+@example
+```
+import mnemonicWords = require('mnemonic-words');
+
+console.log(mnemonicWords);
+//=> ['abandon', 'ability', …]
+```
+*/
+declare const mnemonicWords: readonly string[];
+
+export = mnemonicWords;

index.test-d.ts

@@ -0,0 +1,6 @@
+import {expectType} from 'tsd';
+import mnemonicWords = require('.');
+import mnemonicWordsJson = require('./words.json');
+
+expectType<readonly string[]>(mnemonicWords);
+expectType<readonly string[]>(mnemonicWordsJson);

package.json

@@ -13,11 +13,13 @@
 		"node": ">=8"
 	},
 	"scripts": {
-		"test": "xo && ava"
+		"test": "xo && ava && tsd"
 	},
 	"files": [
 		"index.js",
-		"words.json"
+		"index.d.ts",
+		"words.json",
+		"words.json.d.ts"
 	],
 	"keywords": [
 		"mnemonic",
@@ -31,7 +33,8 @@
 		"bitcoin"
 	],
 	"devDependencies": {
-		"ava": "*",
-		"xo": "*"
+		"ava": "^1.4.1",
+		"tsd": "^0.7.2",
+		"xo": "^0.24.0"
 	}
 }

test.js

@@ -1,8 +1,8 @@
 import test from 'ava';
-import m from '.';
+import mnemonicWords from '.';
 
-test(t => {
-	t.true(Array.isArray(m));
-	t.true(m.length > 0);
-	t.is(m[20], 'action');
+test('main', t => {
+	t.true(Array.isArray(mnemonicWords));
+	t.true(mnemonicWords.length > 0);
+	t.is(mnemonicWords[20], 'action');
 });

words.json.d.ts

@@ -0,0 +1,3 @@
+declare const mnemonicWordsJson: readonly string[];
+
+export = mnemonicWordsJson;