feat: concat arrays in babelOptions (#43)

README.md

@@ -332,7 +332,7 @@ pluginTester({
   // only necessary if you use fixture or outputFixture in your tests
   filename: __filename,
 
-  // these will be `lodash.merge`d with the test objects
+  // these will be `lodash.mergeWith`d with the test objects
   // below are the defaults:
   babelOptions: {
     parserOpts: {},
@@ -469,6 +469,7 @@ Thanks goes to these people ([emoji key][emojis]):
 | [<img src="https://avatars.githubusercontent.com/u/1500684?v=3" width="100px;" alt="Kent C. Dodds"/><br /><sub><b>Kent C. Dodds</b></sub>](https://kentcdodds.com)<br />[💻](https://github.com/babel-utils/babel-plugin-tester/commits?author=kentcdodds "Code") [📖](https://github.com/babel-utils/babel-plugin-tester/commits?author=kentcdodds "Documentation") [🚇](#infra-kentcdodds "Infrastructure (Hosting, Build-Tools, etc)") [⚠️](https://github.com/babel-utils/babel-plugin-tester/commits?author=kentcdodds "Tests") | [<img src="https://avatars3.githubusercontent.com/u/952783?v=3" width="100px;" alt="james kyle"/><br /><sub><b>james kyle</b></sub>](http://thejameskyle.com/)<br />[💻](https://github.com/babel-utils/babel-plugin-tester/commits?author=thejameskyle "Code") [📖](https://github.com/babel-utils/babel-plugin-tester/commits?author=thejameskyle "Documentation") [👀](#review-thejameskyle "Reviewed Pull Requests") [⚠️](https://github.com/babel-utils/babel-plugin-tester/commits?author=thejameskyle "Tests") | [<img src="https://avatars1.githubusercontent.com/u/1894628?v=3" width="100px;" alt="Brad Bohen"/><br /><sub><b>Brad Bohen</b></sub>](https://github.com/bbohen)<br />[🐛](https://github.com/babel-utils/babel-plugin-tester/issues?q=author%3Abbohen "Bug reports") | [<img src="https://avatars0.githubusercontent.com/u/1295580?v=3" width="100px;" alt="Kyle Welch"/><br /><sub><b>Kyle Welch</b></sub>](http://www.krwelch.com)<br />[💻](https://github.com/babel-utils/babel-plugin-tester/commits?author=kwelch "Code") [📖](https://github.com/babel-utils/babel-plugin-tester/commits?author=kwelch "Documentation") [⚠️](https://github.com/babel-utils/babel-plugin-tester/commits?author=kwelch "Tests") | [<img src="https://avatars3.githubusercontent.com/u/6680299?v=4" width="100px;" alt="kontrollanten"/><br /><sub><b>kontrollanten</b></sub>](https://github.com/kontrollanten)<br />[💻](https://github.com/babel-utils/babel-plugin-tester/commits?author=kontrollanten "Code") | [<img src="https://avatars3.githubusercontent.com/u/117921?v=4" width="100px;" alt="Rubén Norte"/><br /><sub><b>Rubén Norte</b></sub>](https://github.com/rubennorte)<br />[💻](https://github.com/babel-utils/babel-plugin-tester/commits?author=rubennorte "Code") [⚠️](https://github.com/babel-utils/babel-plugin-tester/commits?author=rubennorte "Tests") | [<img src="https://avatars2.githubusercontent.com/u/3869532?v=4" width="100px;" alt="André Neves"/><br /><sub><b>André Neves</b></sub>](http://andreneves.work)<br />[💻](https://github.com/babel-utils/babel-plugin-tester/commits?author=andrefgneves "Code") [⚠️](https://github.com/babel-utils/babel-plugin-tester/commits?author=andrefgneves "Tests") |
 | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
 | [<img src="https://avatars0.githubusercontent.com/u/3842800?v=4" width="100px;" alt="Kristoffer K."/><br /><sub><b>Kristoffer K.</b></sub>](https://github.com/merceyz)<br />[💻](https://github.com/babel-utils/babel-plugin-tester/commits?author=merceyz "Code") |
+
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors][all-contributors] specification.
@@ -510,7 +511,7 @@ MIT
 [twitter-badge]: https://img.shields.io/twitter/url/https/github.com/babel-utils/babel-plugin-tester.svg?style=social
 [emojis]: https://github.com/kentcdodds/all-contributors#emoji-key
 [all-contributors]: https://github.com/kentcdodds/all-contributors
-[lodash.merge]: https://lodash.com/docs/4.17.4#merge
+[lodash.mergewith]: https://lodash.com/docs/4.17.4#mergeWith
 [ruletester]: http://eslint.org/docs/developer-guide/working-with-rules#rule-unit-tests
 [@thejameskyle]: https://github.com/thejameskyle
 [jamestweet]: https://twitter.com/thejameskyle/status/864359438819262465

package.json

@@ -25,7 +25,7 @@
   "dependencies": {
     "common-tags": "^1.4.0",
     "invariant": "^2.2.2",
-    "lodash.merge": "^4.6.0",
+    "lodash.mergewith": "^4.6.0",
     "path-exists": "^3.0.0",
     "strip-indent": "^2.0.0"
   },

src/__tests__/index.js

@@ -650,6 +650,52 @@ test('gets options from options.json files when using fixtures', async () => {
   expect(optionBar).toHaveBeenCalledTimes(1)
 })
 
+test('appends to root plugins array', async () => {
+  const optionRootFoo = jest.fn()
+  const optionFoo = jest.fn()
+  const optionBar = jest.fn()
+  const pluginWithOptions = jest.fn(() => {
+    return {
+      visitor: {
+        Program(programPath, state) {
+          if (state.opts.rootFoo === 'rootBar') {
+            optionRootFoo()
+          }
+          if (state.opts.foo === 'bar') {
+            optionFoo()
+          }
+          if (state.opts.bar === 'baz') {
+            optionBar()
+          }
+        },
+      },
+    }
+  })
+  const programVisitor = jest.fn()
+  const otherPlugin = () => {
+    return {
+      visitor: {
+        Program: programVisitor,
+      },
+    }
+  }
+
+  await runPluginTester(
+    getOptions({
+      plugin: pluginWithOptions,
+      fixtures: getFixturePath('fixtures'),
+      babelOptions: {
+        plugins: [otherPlugin],
+      },
+    }),
+  )
+
+  expect(optionRootFoo).toHaveBeenCalledTimes(8)
+  expect(optionFoo).toHaveBeenCalledTimes(2)
+  expect(optionBar).toHaveBeenCalledTimes(1)
+  expect(programVisitor).toHaveBeenCalledTimes(9)
+})
+
 function getOptions(overrides) {
   return {
     pluginName: 'captains-log',

src/index.js

@@ -4,7 +4,7 @@ import assert from 'assert'
 import path from 'path'
 import fs from 'fs'
 import pathExists from 'path-exists'
-import merge from 'lodash.merge'
+import mergeWith from 'lodash.mergewith'
 import invariant from 'invariant'
 import stripIndent from 'strip-indent'
 import {oneLine} from 'common-tags'
@@ -21,6 +21,13 @@ const fullDefaultConfig = {
   },
 }
 
+function mergeCustomizer(objValue, srcValue) {
+  if (Array.isArray(objValue)) {
+    return objValue.concat(srcValue)
+  }
+  return undefined
+}
+
 function pluginTester({
   /* istanbul ignore next (TODO: write a test for this) */
   babel = require('@babel/core'),
@@ -52,7 +59,7 @@ function pluginTester({
   if (!testAsArray.length) {
     return
   }
-  const testerConfig = merge({}, fullDefaultConfig, rest)
+  const testerConfig = mergeWith({}, fullDefaultConfig, rest, mergeCustomizer)
 
   describe(describeBlockTitle, () => {
     testAsArray.forEach(testConfig => {
@@ -72,7 +79,7 @@ function pluginTester({
         setup = noop,
         teardown,
         formatResult = r => r,
-      } = merge({}, testerConfig, toTestConfig(testConfig))
+      } = mergeWith({}, testerConfig, toTestConfig(testConfig), mergeCustomizer)
       assert(
         (!skip && !only) || skip !== only,
         'Cannot enable both skip and only on a test',
@@ -191,7 +198,7 @@ function pluginTester({
       output = getCode(filename, testConfig.outputFixture) || undefined,
       pluginOptions: testOptions = pluginOptions,
     } = testConfig
-    return merge(
+    return mergeWith(
       {
         babelOptions: {filename: getPath(filename, fixture)},
       },
@@ -202,6 +209,7 @@ function pluginTester({
         code: stripIndent(code).trim(),
         ...(output ? {output: stripIndent(output).trim()} : {}),
       },
+      mergeCustomizer,
     )
   }
 }
@@ -257,7 +265,7 @@ const createFixtureTests = (fixturesDir, options) => {
 
       const babelRcPath = path.join(fixtureDir, '.babelrc')
 
-      const {babelOptions} = merge(
+      const {babelOptions} = mergeWith(
         {},
         fullDefaultConfig,
         {
@@ -278,6 +286,7 @@ const createFixtureTests = (fixturesDir, options) => {
           },
         },
         rest,
+        mergeCustomizer,
       )
       const actual = formatResult(
         babel.transformFileSync(codePath, babelOptions).code.trim(),