Fixed the build command using the wrong Babel CLI

.babelrc

@@ -1,13 +1,13 @@
 {
   "presets": [
     [
-      "@babel/env",
+      "@babel/preset-env",
       {
         "targets": {
           "node": "6"
         }
       }
     ],
-    "@babel/react"
+    "@babel/preset-react"
   ]
 }

.gitignore

@@ -3,3 +3,13 @@ coverage
 npm-debug.log
 .vscode
 .DS_Store
+
+# Ignoring files generated by the build
+createSerializer.js
+index.js
+mount.js
+render.js
+serializer.js
+shallow.js
+utils.js
+yarn-error.log

package.json

@@ -6,11 +6,11 @@
   "scripts": {
     "build": "babel src -d ./",
     "clean": "rm *.js",
-    "prepublishOnly": "npm run build",
-    "lint": "eslint src tests/core && npm run format-check",
+    "prepublishOnly": "yarn build",
+    "lint": "eslint src tests/core && yarn format-check",
     "format": "prettier src/**/*.js tests/core/*.js tests/core/**/*.js --write --single-quote --trailing-comma all --no-bracket-spacing",
     "format-check": "prettier-check src/**/*.js tests/core/*.js tests/core/**/*.js --write --single-quote --trailing-comma all --no-bracket-spacing",
-    "test": "npm run lint && npm run test-core",
+    "test": "yarn lint && yarn test-core",
     "test-core": "NODE_ENV=test jest --coverage"
   },
   "keywords": [
@@ -47,6 +47,7 @@
     "enzyme": "^3.4.0"
   },
   "devDependencies": {
+    "@babel/cli": "^7.8.4",
     "@babel/core": "^7.7.2",
     "@babel/preset-env": "^7.7.1",
     "@babel/preset-react": "^7.7.0",

yarn.lock

@@ -2,6 +2,22 @@
 # yarn lockfile v1
 
 
+"@babel/cli@^7.8.4":
+  version "7.8.4"
+  resolved "https://registry.yarnpkg.com/@babel/cli/-/cli-7.8.4.tgz#505fb053721a98777b2b175323ea4f090b7d3c1c"
+  integrity sha512-XXLgAm6LBbaNxaGhMAznXXaxtCWfuv6PIDJ9Alsy9JYTOh+j2jJz+L/162kkfU1j/pTSxK1xGmlwI4pdIMkoag==
+  dependencies:
+    commander "^4.0.1"
+    convert-source-map "^1.1.0"
+    fs-readdir-recursive "^1.1.0"
+    glob "^7.0.0"
+    lodash "^4.17.13"
+    make-dir "^2.1.0"
+    slash "^2.0.0"
+    source-map "^0.5.0"
+  optionalDependencies:
+    chokidar "^2.1.8"
+
 "@babel/code-frame@^7.0.0", "@babel/code-frame@^7.5.5":
   version "7.5.5"
   resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.5.5.tgz#bc0782f6d69f7b7d49531219699b988f669a8f9d"
@@ -1174,6 +1190,11 @@ astral-regex@^1.0.0:
   resolved "https://registry.yarnpkg.com/astral-regex/-/astral-regex-1.0.0.tgz#6c8c3fb827dd43ee3918f27b82782ab7658a6fd9"
   integrity sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==
 
+async-each@^1.0.1:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/async-each/-/async-each-1.0.3.tgz#b727dbf87d7651602f06f4d4ac387f47d91b0cbf"
+  integrity sha512-z/WhQ5FPySLdvREByI2vZiTWwCnF0moMJ1hK9YQwDTHKh6I7/uSckMetoRGb5UBZPC1z0jlw+n/XCgjeH7y1AQ==
+
 async-limiter@~1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.1.tgz#dd379e94f0db8310b08291f9d64c3209766617fd"
@@ -1278,6 +1299,11 @@ bcrypt-pbkdf@^1.0.0:
   dependencies:
     tweetnacl "^0.14.3"
 
+binary-extensions@^1.0.0:
+  version "1.13.1"
+  resolved "https://registry.yarnpkg.com/binary-extensions/-/binary-extensions-1.13.1.tgz#598afe54755b2868a5330d2aff9d4ebb53209b65"
+  integrity sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw==
+
 boolbase@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/boolbase/-/boolbase-1.0.0.tgz#68dff5fbe60c51eb37725ea9e3ed310dcc1e776e"
@@ -1291,7 +1317,7 @@ brace-expansion@^1.1.7:
     balanced-match "^1.0.0"
     concat-map "0.0.1"
 
-braces@^2.3.1:
+braces@^2.3.1, braces@^2.3.2:
   version "2.3.2"
   resolved "https://registry.yarnpkg.com/braces/-/braces-2.3.2.tgz#5979fd3f14cd531565e5fa2df1abfff1dfaee729"
   integrity sha512-aNdbnj9P8PjdXU4ybaWLK2IF3jc/EoDYbC7AazW6to3TRsfXxscC9UXOB5iDiEQrkyIbWp2SLQda4+QAa7nc3w==
@@ -1431,6 +1457,25 @@ cheerio@^1.0.0-rc.2:
     lodash "^4.15.0"
     parse5 "^3.0.1"
 
+chokidar@^2.1.8:
+  version "2.1.8"
+  resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-2.1.8.tgz#804b3a7b6a99358c3c5c61e71d8728f041cff917"
+  integrity sha512-ZmZUazfOzf0Nve7duiCKD23PFSCs4JPoYyccjUFF3aQkQadqBhfzhjkwBH2mNOG9cTBwhamM37EIsIkZw3nRgg==
+  dependencies:
+    anymatch "^2.0.0"
+    async-each "^1.0.1"
+    braces "^2.3.2"
+    glob-parent "^3.1.0"
+    inherits "^2.0.3"
+    is-binary-path "^1.0.0"
+    is-glob "^4.0.0"
+    normalize-path "^3.0.0"
+    path-is-absolute "^1.0.0"
+    readdirp "^2.2.1"
+    upath "^1.1.1"
+  optionalDependencies:
+    fsevents "^1.2.7"
+
 chownr@^1.1.1:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/chownr/-/chownr-1.1.3.tgz#42d837d5239688d55f303003a508230fa6727142"
@@ -1530,6 +1575,11 @@ commander@^2.19.0, commander@~2.20.3:
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
   integrity sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==
 
+commander@^4.0.1:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-4.1.0.tgz#545983a0603fe425bc672d66c9e3c89c42121a83"
+  integrity sha512-NIQrwvv9V39FHgGFm36+U9SMQzbiHvU79k+iADraJTpmrFFfx7Ds0IvDoAdZsDrknlkRk14OYoWXb57uTh7/sw==
+
 component-emitter@^1.2.1:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/component-emitter/-/component-emitter-1.3.0.tgz#16e4070fba8ae29b679f2215853ee181ab2eabc0"
@@ -1560,7 +1610,7 @@ contains-path@^0.1.0:
   resolved "https://registry.yarnpkg.com/contains-path/-/contains-path-0.1.0.tgz#fe8cf184ff6670b6baef01a9d4861a5cbec4120a"
   integrity sha1-/ozxhP9mcLa67wGp1IYaXL7EEgo=
 
-convert-source-map@^1.4.0, convert-source-map@^1.7.0:
+convert-source-map@^1.1.0, convert-source-map@^1.4.0, convert-source-map@^1.7.0:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.7.0.tgz#17a2cb882d7f77d3490585e2ce6c524424a3a442"
   integrity sha512-4FJkXzKXEDB1snCFZlLP4gpC3JILicCpGbzG9f9G7tGqGCzETQ2hWPrcinA9oU4wtf2biUaEH5065UnMeR33oA==
@@ -2391,6 +2441,11 @@ fs-minipass@^1.2.5:
   dependencies:
     minipass "^2.6.0"
 
+fs-readdir-recursive@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/fs-readdir-recursive/-/fs-readdir-recursive-1.1.0.tgz#e32fc030a2ccee44a6b5371308da54be0b397d27"
+  integrity sha512-GNanXlVr2pf02+sPN40XN8HG+ePaNcvM0q5mZBd668Obwb0yD5GiUbZOFgwn8kGMY6I3mdyDJzieUy3PTYyTRA==
+
 fs.realpath@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
@@ -2477,7 +2532,15 @@ getpass@^0.1.1:
   dependencies:
     assert-plus "^1.0.0"
 
-glob@^7.1.1, glob@^7.1.2, glob@^7.1.3:
+glob-parent@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-3.1.0.tgz#9e6af6299d8d3bd2bd40430832bd113df906c5ae"
+  integrity sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=
+  dependencies:
+    is-glob "^3.1.0"
+    path-dirname "^1.0.0"
+
+glob@^7.0.0, glob@^7.1.1, glob@^7.1.2, glob@^7.1.3:
   version "7.1.6"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.6.tgz#141f33b81a7c2492e125594307480c46679278a6"
   integrity sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==
@@ -2732,6 +2795,13 @@ is-arrayish@^0.2.1:
   resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.2.1.tgz#77c99840527aa8ecb1a8ba697b80645a7a926a9d"
   integrity sha1-d8mYQFJ6qOyxqLppe4BkWnqSap0=
 
+is-binary-path@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-binary-path/-/is-binary-path-1.0.1.tgz#75f16642b480f187a711c814161fd3a4a7655898"
+  integrity sha1-dfFmQrSA8YenEcgUFh/TpKdlWJg=
+  dependencies:
+    binary-extensions "^1.0.0"
+
 is-boolean-object@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-boolean-object/-/is-boolean-object-1.0.0.tgz#98f8b28030684219a95f375cfbd88ce3405dff93"
@@ -2803,6 +2873,11 @@ is-extendable@^1.0.1:
   dependencies:
     is-plain-object "^2.0.4"
 
+is-extglob@^2.1.0, is-extglob@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/is-extglob/-/is-extglob-2.1.1.tgz#a88c02535791f02ed37c76a1b9ea9773c833f8c2"
+  integrity sha1-qIwCU1eR8C7TfHahueqXc8gz+MI=
+
 is-fullwidth-code-point@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz#ef9e31386f031a7f0d643af82fde50c457ef00cb"
@@ -2820,6 +2895,20 @@ is-generator-fn@^2.0.0:
   resolved "https://registry.yarnpkg.com/is-generator-fn/-/is-generator-fn-2.1.0.tgz#7d140adc389aaf3011a8f2a2a4cfa6faadffb118"
   integrity sha512-cTIB4yPYL/Grw0EaSzASzg6bBy9gqCofvWN8okThAYIxKJZC+udlRAmGbM0XLeniEJSs8uEgHPGuHSe1XsOLSQ==
 
+is-glob@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-3.1.0.tgz#7ba5ae24217804ac70707b96922567486cc3e84a"
+  integrity sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=
+  dependencies:
+    is-extglob "^2.1.0"
+
+is-glob@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-4.0.1.tgz#7567dbe9f2f5e2467bc77ab83c4a29482407a5dc"
+  integrity sha512-5G0tKtBTFImOqDnLB2hG6Bp2qcKEFduo4tZu9MT/H6NQv/ghhy30o55ufafxJ/LdH79LLs2Kfrn85TLKyA7BUg==
+  dependencies:
+    is-extglob "^2.1.1"
+
 is-number-object@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/is-number-object/-/is-number-object-1.0.3.tgz#f265ab89a9f445034ef6aff15a8f00b00f551799"
@@ -3838,6 +3927,11 @@ normalize-path@^2.1.1:
   dependencies:
     remove-trailing-separator "^1.0.1"
 
+normalize-path@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-3.0.0.tgz#0dcd69ff23a1c9b11fd0978316644a0388216a65"
+  integrity sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==
+
 npm-bundled@^1.0.1:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/npm-bundled/-/npm-bundled-1.0.6.tgz#e7ba9aadcef962bb61248f91721cd932b3fe6bdd"
@@ -4120,6 +4214,11 @@ pascalcase@^0.1.1:
   resolved "https://registry.yarnpkg.com/pascalcase/-/pascalcase-0.1.1.tgz#b363e55e8006ca6fe21784d2db22bd15d7917f14"
   integrity sha1-s2PlXoAGym/iF4TS2yK9FdeRfxQ=
 
+path-dirname@^1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/path-dirname/-/path-dirname-1.0.2.tgz#cc33d24d525e099a5388c0336c6e32b9160609e0"
+  integrity sha1-zDPSTVJeCZpTiMAzbG4yuRYGCeA=
+
 path-exists@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/path-exists/-/path-exists-3.0.0.tgz#ce0ebeaa5f78cb18925ea7d810d7b59b010fd515"
@@ -4419,6 +4518,19 @@ read-pkg@^3.0.0:
     normalize-package-data "^2.3.2"
     path-type "^3.0.0"
 
+readable-stream@^2.0.2:
+  version "2.3.7"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.7.tgz#1eca1cf711aef814c04f62252a36a62f6cb23b57"
+  integrity sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==
+  dependencies:
+    core-util-is "~1.0.0"
+    inherits "~2.0.3"
+    isarray "~1.0.0"
+    process-nextick-args "~2.0.0"
+    safe-buffer "~5.1.1"
+    string_decoder "~1.1.1"
+    util-deprecate "~1.0.1"
+
 readable-stream@^2.0.6, readable-stream@^2.2.2:
   version "2.3.6"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
@@ -4441,6 +4553,15 @@ readable-stream@^3.1.1:
     string_decoder "^1.1.1"
     util-deprecate "^1.0.1"
 
+readdirp@^2.2.1:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/readdirp/-/readdirp-2.2.1.tgz#0e87622a3325aa33e892285caf8b4e846529a525"
+  integrity sha512-1JU/8q+VgFZyxwrJ+SVIOsh+KywWGpds3NTqikiKpDMZWScmAYyKIgqkO+ARvNWJfXeXR1zxz7aHF4u4CyH6vQ==
+  dependencies:
+    graceful-fs "^4.1.11"
+    micromatch "^3.1.10"
+    readable-stream "^2.0.2"
+
 realpath-native@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/realpath-native/-/realpath-native-1.1.0.tgz#2003294fea23fb0672f2476ebe22fcf498a2d65c"
@@ -5261,6 +5382,11 @@ unset-value@^1.0.0:
     has-value "^0.3.1"
     isobject "^3.0.0"
 
+upath@^1.1.1:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/upath/-/upath-1.2.0.tgz#8f66dbcd55a883acdae4408af8b035a5044c1894"
+  integrity sha512-aZwGpamFO61g3OlfT7OQCHqhGnW43ieH9WZeP7QxN/G/jS4jfqUkZxoryvJgVPEcrl5NL/ggHsSmLMHuH64Lhg==
+
 uri-js@^4.2.2:
   version "4.2.2"
   resolved "https://registry.yarnpkg.com/uri-js/-/uri-js-4.2.2.tgz#94c540e1ff772956e2299507c010aea6c8838eb0"