Add eslint-config-callstack-io (#7)

Author: ferrannp

.eslintrc.json

@@ -0,0 +1,8 @@
+{
+  "extends": "callstack-io",
+  "rules": {
+    "global-require": 0,
+    "flowtype/no-weak-types": 0,
+    "strict": [0, "global"]
+  }
+}

__tests__/snapshotDiff.test.js

@@ -121,11 +121,11 @@ test('collapses diffs and strips ansi by default', () => {
 });
 
 test('can expand diff', () => {
-  expect(snapshotDiff(a, b, {expand: true})).toMatchSnapshot();
+  expect(snapshotDiff(a, b, { expand: true })).toMatchSnapshot();
 });
 
 test('can colorize diff', () => {
-  expect(snapshotDiff(a, b, {colors: true})).toMatchSnapshot();
+  expect(snapshotDiff(a, b, { colors: true })).toMatchSnapshot();
 });
 
 test('can use contextLines on diff', () => {

package.json

@@ -7,24 +7,29 @@
   "author": "Michał Pierzchała <thymikee@gmail.com>",
   "scripts": {
     "build": "babel src --out-dir build",
-    "watch": "babel -w src --out-dir build",
-    "test": "jest",
+    "lint": "eslint src/ __tests__/",
+    "flow": "flow check",
     "prepublish": "npm run build",
-    "flow": "flow check"
+    "test": "jest",
+    "watch": "babel -w src --out-dir build"
   },
   "repository": "https://github.com/thymikee/snapshot-diff",
   "peerDependencies": {
     "jest": ">=16",
     "react-test-renderer": ">=15"
   },
   "dependencies": {
+    "jest-diff": "^20.0.3",
+    "pretty-format": "^20.0.3",
     "strip-ansi": "^4.0.0"
   },
   "devDependencies": {
     "babel-cli": "^6.24.1",
     "babel-preset-env": "^1.6.0",
     "babel-preset-flow": "^6.23.0",
     "babel-preset-react": "^6.24.1",
+    "eslint": "^4.3.0",
+    "eslint-config-callstack-io": "^0.4.0",
     "flow-bin": "^0.51.0",
     "jest": "^20.0.4",
     "react": "^15.6.1",

src/index.js

@@ -1,9 +1,11 @@
 // @flow
+
 'use strict';
 
 const diff = require('jest-diff');
 const prettyFormat = require('pretty-format');
-const {ReactElement} = prettyFormat.plugins;
+
+const { ReactElement } = prettyFormat.plugins;
 const reactElement = Symbol.for('react.element');
 
 type Options = {
@@ -39,28 +41,29 @@ const snapshotDiff = (
   return difference;
 };
 
-const isReactComponent = valueA => valueA && valueA.$$typeof === reactElement;
+const isReactComponent = (value: any) =>
+  value && value.$$typeof === reactElement;
 
-function diffStrings(valueA, valueB, options) {
+function diffStrings(valueA: any, valueB: any, options: Options) {
   return diff(valueA, valueB, {
     expand: options.expand,
     contextLines: options.contextLines,
     aAnnotation: 'First value',
-    bAnnotation: 'Second value'
+    bAnnotation: 'Second value',
   });
 }
 
-function diffReactComponents(valueA, valueB, options) {
+function diffReactComponents(valueA: any, valueB: any, options: Options) {
   const renderer = require('react-test-renderer');
   const reactValueA = renderer.create(valueA).toJSON();
   const reactValueB = renderer.create(valueB).toJSON();
-  const prettyFormatOptions = {plugins: [ReactElement], min: true};
+  const prettyFormatOptions = { plugins: [ReactElement], min: true };
 
   return diff(reactValueA, reactValueB, {
     expand: options.expand,
     contextLines: options.contextLines,
     aAnnotation: prettyFormat(valueA, prettyFormatOptions),
-    bAnnotation: prettyFormat(valueB, prettyFormatOptions)
+    bAnnotation: prettyFormat(valueB, prettyFormatOptions),
   });
 }