diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..addffae
--- /dev/null
+++ b/.gitignore
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+/coverage
+/node_modules
+/vendor
diff --git a/.prettierrc b/.prettierrc
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index 0000000..02f310c
--- /dev/null
+++ b/.prettierrc
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+{
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+    "tabWidth": 4,
+    "useTabs": false,
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+    "singleQuote": false,
+    "trailingComma": "all",
+    "bracketSpacing": true,
+    "jsxBracketSameLine": false,
+    "arrowParens": "avoid",
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+}
diff --git a/code-of-conduct.md b/code-of-conduct.md
new file mode 100644
index 0000000..e7819d2
--- /dev/null
+++ b/code-of-conduct.md
@@ -0,0 +1,44 @@
+# Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+# Our Standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+-   Using welcoming and inclusive language
+-   Being respectful of differing viewpoints and experiences
+-   Gracefully accepting constructive criticism
+-   Focusing on what is best for the community
+-   Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+-   The use of sexualized language or imagery and unwelcome sexual attention or advances
+-   Trolling, insulting/derogatory comments, and personal or political attacks
+-   Public or private harassment
+-   Publishing others' private information, such as a physical or electronic address, without explicit permission
+-   Other conduct which could reasonably be considered inappropriate in a professional setting
+
+# Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
+
+# Scope
+
+This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
+
+# Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at cgpitt@gmail.com. All complaints will be reviewed and investigated and will result in a response that is deemed necessary and appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+
+# Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..38caf9c
--- /dev/null
+++ b/composer.json
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+{
+    "name": "pre/prop-types",
+    "description": "Prop type validators for Phpx components",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Christopher Pitt",
+            "email": "cgpitt@gmail.com"
+        }
+    ],
+    "autoload": {
+        "psr-4": {
+            "Pre\\": "source"
+        }
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^7.5"
+    },
+    "scripts": {
+        "test": "vendor/bin/phpunit",
+        "test:coverage": "vendor/bin/phpunit --coverage-html coverage"
+    }
+}
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new file mode 100644
index 0000000..467f6dd
--- /dev/null
+++ b/composer.lock
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+{
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+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+            "time": "2017-03-03T06:23:57+00:00"
+        },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "4d7a795d35b889bf80a0cc04e08d77cedfa917a9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/4d7a795d35b889bf80a0cc04e08d77cedfa917a9",
+                "reference": "4d7a795d35b889bf80a0cc04e08d77cedfa917a9",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides a list of PHP built-in functions that operate on resources",
+            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "time": "2018-10-04T04:07:39+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "time": "2016-10-03T07:35:21+00:00"
+        },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.10.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "e3d826245268269cd66f8326bd8bc066687b4a19"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/e3d826245268269cd66f8326bd8bc066687b4a19",
+                "reference": "e3d826245268269cd66f8326bd8bc066687b4a19",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "suggest": {
+                "ext-ctype": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.9-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                },
+                {
+                    "name": "Gert de Pagter",
+                    "email": "backendtea@gmail.com"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "time": "2018-08-06T14:22:27+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "time": "2017-04-07T12:08:54+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.4.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/83e253c8e0be5b0257b881e1827274667c5c17a9",
+                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0",
+                "symfony/polyfill-ctype": "^1.8"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6",
+                "sebastian/version": "^1.0.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.3-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "time": "2018-12-25T11:19:39+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": []
+}
diff --git a/licence.md b/licence.md
new file mode 100644
index 0000000..1c10e33
--- /dev/null
+++ b/licence.md
@@ -0,0 +1,7 @@
+Copyright Christopher Pitt
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..3823e9e
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,49 @@
+{
+    "requires": true,
+    "lockfileVersion": 1,
+    "dependencies": {
+        "@prettier/plugin-php": {
+            "version": "0.9.0",
+            "resolved": "https://registry.npmjs.org/@prettier/plugin-php/-/plugin-php-0.9.0.tgz",
+            "integrity": "sha512-x3RS9P2W8jRseHa1wecmZnzh9w2kLUJIR6//CroHZtagFSgnGLRNvReDZLlT1PJtTMPVacluPOjY2BFPapO9bw==",
+            "dev": true,
+            "requires": {
+                "mem": "^3.0.1",
+                "php-parser": "github:glayzzle/php-parser#ca007c812e9920bcf1ae9fd24f1a92f5d5906a5e"
+            }
+        },
+        "mem": {
+            "version": "3.0.1",
+            "resolved": "https://registry.npmjs.org/mem/-/mem-3.0.1.tgz",
+            "integrity": "sha512-QKs47bslvOE0NbXOqG6lMxn6Bk0Iuw0vfrIeLykmQle2LkCw1p48dZDdzE+D88b/xqRJcZGcMNeDvSVma+NuIQ==",
+            "dev": true,
+            "requires": {
+                "mimic-fn": "^1.0.0",
+                "p-is-promise": "^1.1.0"
+            }
+        },
+        "mimic-fn": {
+            "version": "1.2.0",
+            "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-1.2.0.tgz",
+            "integrity": "sha512-jf84uxzwiuiIVKiOLpfYk7N46TSy8ubTonmneY9vrpHNAnp0QBt2BxWV9dO3/j+BoVAb+a5G6YDPW3M5HOdMWQ==",
+            "dev": true
+        },
+        "p-is-promise": {
+            "version": "1.1.0",
+            "resolved": "https://registry.npmjs.org/p-is-promise/-/p-is-promise-1.1.0.tgz",
+            "integrity": "sha1-nJRWmJ6fZYgBewQ01WCXZ1w9oF4=",
+            "dev": true
+        },
+        "php-parser": {
+            "version": "github:glayzzle/php-parser#ca007c812e9920bcf1ae9fd24f1a92f5d5906a5e",
+            "from": "github:glayzzle/php-parser#ca007c812e9920bcf1ae9fd24f1a92f5d5906a5e",
+            "dev": true
+        },
+        "prettier": {
+            "version": "1.16.4",
+            "resolved": "https://registry.npmjs.org/prettier/-/prettier-1.16.4.tgz",
+            "integrity": "sha512-ZzWuos7TI5CKUeQAtFd6Zhm2s6EpAD/ZLApIhsF9pRvRtM1RFo61dM/4MSRUA0SuLugA/zgrZD8m0BaY46Og7g==",
+            "dev": true
+        }
+    }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..0c707d7
--- /dev/null
+++ b/package.json
@@ -0,0 +1,10 @@
+{
+    "private": true,
+    "scripts": {
+        "format:php": "prettier --config=.prettierrc --write --parser=php"
+    },
+    "devDependencies": {
+        "@prettier/plugin-php": "^0.9.0",
+        "prettier": "^1.16.4"
+    }
+}
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..a02eef8
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,12 @@
+<phpunit bootstrap="vendor/autoload.php">
+    <testsuites>
+        <testsuite name="prop-types">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">source</directory>
+        </whitelist>
+    </filter>
+</phpunit>
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..002a089
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,14 @@
+# Prop Types
+
+This is a PHP take on the ReactJS Prop Types checking. I made it because I wanted an easier way to validate the type and presence of properties in Phpx components.
+
+## Getting started
+
+```
+git clone git@github.com:preprocess/pre-prop-types.git
+cd pre-prop-types
+composer install
+composer test
+```
+
+I want to write a blog post about how to use this, practically. When that's done, I will replace this paragraph with a link to the post.
diff --git a/source/PropTypes.php b/source/PropTypes.php
new file mode 100644
index 0000000..d881d16
--- /dev/null
+++ b/source/PropTypes.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Pre;
+
+use Pre\PropTypes\Concerns\ArrayConcern;
+use Pre\PropTypes\Concerns\ArrayOfConcern;
+use Pre\PropTypes\Concerns\BoolConcern;
+use Pre\PropTypes\Concerns\IntConcern;
+use Pre\PropTypes\Concerns\ObjectOfTypeConcern;
+use Pre\PropTypes\Concerns\StringConcern;
+use Pre\PropTypes\Concerns\TypesConcern;
+use Pre\PropTypes\Concerns\ValidationConcern;
+
+final class PropTypes
+{
+    use ArrayConcern;
+    use ArrayOfConcern;
+    use BoolConcern;
+    use IntConcern;
+    use ObjectOfTypeConcern;
+    use StringConcern;
+    use TypesConcern;
+    use ValidationConcern;
+
+    private function __construct()
+    {
+        // hidden to prevent the class being instantiated
+    }
+
+    private function __clone()
+    {
+        // hidden to prevent the class being instantiated
+    }
+}
diff --git a/source/PropTypes/Concerns/ArrayConcern.php b/source/PropTypes/Concerns/ArrayConcern.php
new file mode 100644
index 0000000..43c4f1d
--- /dev/null
+++ b/source/PropTypes/Concerns/ArrayConcern.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace Pre\PropTypes\Concerns;
+
+trait ArrayConcern
+{
+    private static function isValidArray($value): bool
+    {
+        return is_array($value);
+    }
+}
diff --git a/source/PropTypes/Concerns/ArrayOfConcern.php b/source/PropTypes/Concerns/ArrayOfConcern.php
new file mode 100644
index 0000000..9ce2361
--- /dev/null
+++ b/source/PropTypes/Concerns/ArrayOfConcern.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Pre\PropTypes\Concerns;
+
+use InvalidArgumentException;
+use Pre\PropTypes\Fluent;
+
+trait ArrayOfConcern
+{
+    private static function isValidArrayOf($value, $definition): bool
+    {
+        if (!is_array($value)) {
+            $actual = is_object($value) ? get_class($value) : gettype($value);
+            throw new InvalidArgumentException("{$definition->name} expects {$definition->type}[] but {$actual} provided");
+        }
+
+        $definition = $definition->definition;
+
+        if (!is_object($definition) || !is_a($definition, Fluent::class)) {
+            throw new InvalidArgumentException("arrayOf missing type definition");
+        }
+
+        foreach ($value as $next) {
+            $type = strtolower($definition->type);
+
+            $suffix = ucfirst($type);
+            $function = "isValid{$suffix}";
+
+            if (!static::{$function}($next)) {
+                $actual = gettype($next);
+
+                throw new InvalidArgumentException("{$definition->name} has an unexpected {$actual} in arrayOf({$type})");
+            }
+        }
+
+        return true;
+    }
+}
diff --git a/source/PropTypes/Concerns/BoolConcern.php b/source/PropTypes/Concerns/BoolConcern.php
new file mode 100644
index 0000000..30bba9e
--- /dev/null
+++ b/source/PropTypes/Concerns/BoolConcern.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace Pre\PropTypes\Concerns;
+
+trait BoolConcern
+{
+    private static function isValidBool($value): bool
+    {
+        return is_bool($value);
+    }
+
+    private static function isValidBoolean($value): bool
+    {
+        return static::isValidBool($value);
+    }
+}
diff --git a/source/PropTypes/Concerns/IntConcern.php b/source/PropTypes/Concerns/IntConcern.php
new file mode 100644
index 0000000..7dbf6d9
--- /dev/null
+++ b/source/PropTypes/Concerns/IntConcern.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace Pre\PropTypes\Concerns;
+
+trait IntConcern
+{
+    private static function isValidInt($value): bool
+    {
+        return is_int($value);
+    }
+
+    private static function isValidInteger($value): bool
+    {
+        return static::isValidInt($value);
+    }
+}
diff --git a/source/PropTypes/Concerns/ObjectOfTypeConcern.php b/source/PropTypes/Concerns/ObjectOfTypeConcern.php
new file mode 100644
index 0000000..9a65ecd
--- /dev/null
+++ b/source/PropTypes/Concerns/ObjectOfTypeConcern.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace Pre\PropTypes\Concerns;
+
+use InvalidArgumentException;
+
+trait ObjectOfTypeConcern
+{
+    private static function isValidObjectOfType($value, $definition): bool
+    {
+        $type = $definition->definition;
+        $isObject = is_object($value);
+
+        if (!$isObject || !is_a($value, $type)) {
+            $actual = $isObject ? get_class($value) : gettype($value);
+            throw new InvalidArgumentException("{$actual} is not objectOfType({$type})");
+        }
+
+        return true;
+    }
+}
diff --git a/source/PropTypes/Concerns/StringConcern.php b/source/PropTypes/Concerns/StringConcern.php
new file mode 100644
index 0000000..3c3074b
--- /dev/null
+++ b/source/PropTypes/Concerns/StringConcern.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace Pre\PropTypes\Concerns;
+
+trait StringConcern
+{
+    private static function isValidString($value): bool
+    {
+        return is_string($value);
+    }
+}
diff --git a/source/PropTypes/Concerns/TypesConcern.php b/source/PropTypes/Concerns/TypesConcern.php
new file mode 100644
index 0000000..7eaf90d
--- /dev/null
+++ b/source/PropTypes/Concerns/TypesConcern.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace Pre\PropTypes\Concerns;
+
+use InvalidArgumentException;
+use Pre\PropTypes\Fluent;
+
+trait TypesConcern
+{
+    private static $types = ["array", "bool", "boolean", "int", "integer", "string"];
+
+    public static function __callStatic(string $method, $parameters = null)
+    {
+        if ($method === "arrayOf" || $method === "objectOfType") {
+            $definition = new Fluent();
+            $definition->type = $method;
+
+            if (!isset($parameters[0])) {
+                throw new InvalidArgumentException("{$method} missing type");
+            }
+
+            $definition->definition = $parameters[0];
+
+            return $definition;
+        }
+
+        if (in_array($method, static::$types)) {
+            $definition = new Fluent();
+            $definition->type = $method;
+
+            return $definition;
+        }
+
+        throw new InvalidArgumentException("{$method} is not a valid type");
+    }
+}
diff --git a/source/PropTypes/Concerns/ValidationConcern.php b/source/PropTypes/Concerns/ValidationConcern.php
new file mode 100644
index 0000000..db1fa9e
--- /dev/null
+++ b/source/PropTypes/Concerns/ValidationConcern.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Pre\PropTypes\Concerns;
+
+use InvalidArgumentException;
+
+trait ValidationConcern
+{
+    public static function validate(array $definitions, array $properties)
+    {
+        foreach ($definitions as $key => $definition) {
+            if (!isset($properties[$key]) && !$definition->isRequired) {
+                continue;
+            }
+
+            if (!isset($properties[$key]) && $definition->isRequired) {
+                throw new InvalidArgumentException("{$key} is required but missing");
+            }
+
+            $value = $properties[$key];
+            $expected = strtolower($definition->type);
+
+            $suffix = ucfirst($expected);
+            $function = "isValid{$suffix}";
+
+            $definition->name = $key;
+
+            if (!static::{$function}($value, $definition)) {
+                $actual = gettype($value);
+                throw new InvalidArgumentException("{$key} expects {$expected} but {$actual} provided");
+            }
+        }
+    }
+}
diff --git a/source/PropTypes/Fluent.php b/source/PropTypes/Fluent.php
new file mode 100644
index 0000000..382cf35
--- /dev/null
+++ b/source/PropTypes/Fluent.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace Pre\PropTypes;
+
+class Fluent
+{
+    public $attributes = [];
+
+    public function __call(string $method, array $parameters = [])
+    {
+        if (count($parameters) < 1) {
+            $this->attributes[$method] = true;
+        }
+
+        return $this;
+    }
+
+    public function __get(string $key)
+    {
+        if (array_key_exists($key, $this->attributes)) {
+            return $this->attributes[$key];
+        }
+    }
+
+    public function __set(string $key, $value)
+    {
+        $this->attributes[$key] = $value;
+    }
+}
diff --git a/tests/PropTypesTest.php b/tests/PropTypesTest.php
new file mode 100644
index 0000000..61f9f02
--- /dev/null
+++ b/tests/PropTypesTest.php
@@ -0,0 +1,195 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use Pre\PropTypes;
+use Pre\PropTypes\Fluent;
+
+final class PropTypesTest extends TestCase
+{
+    public function test_it_can_create_fluent_definitions()
+    {
+        $definition = PropTypes::string()->isRequired();
+
+        $this->assertInstanceOf(Fluent::class, $definition);
+        $this->assertEquals($definition->type, "string");
+        $this->assertTrue($definition->isRequired);
+    }
+
+    public function test_it_can_allow_null_for_optional_values()
+    {
+        $definitions = [
+            "name" => PropTypes::string(),
+        ];
+
+        $properties = [
+            "age" => 99,
+        ];
+
+        PropTypes::validate($definitions, $properties);
+
+        $this->addToAssertionCount(1);
+    }
+
+    public function test_it_can_require_values()
+    {
+        $this->expectException(InvalidArgumentException::class, "name is required but missing");
+
+        $definitions = [
+            "name" => PropTypes::string()->isRequired(),
+        ];
+
+        $properties = [
+            "age" => 99,
+        ];
+
+        PropTypes::validate($definitions, $properties);
+    }
+
+    public function test_it_can_validate_correct_values()
+    {
+        $definitions = [
+            "name" => PropTypes::string()->isRequired(),
+        ];
+
+        $properties = [
+            "name" => "Joe",
+        ];
+
+        PropTypes::validate($definitions, $properties);
+
+        $this->addToAssertionCount(1);
+    }
+
+    public function test_it_can_validate_incorrect_values()
+    {
+        $this->expectException(InvalidArgumentException::class, "name expects string but integer provided");
+
+        $definitions = [
+            "name" => PropTypes::string()->isRequired(),
+        ];
+
+        $properties = [
+            "name" => 99,
+        ];
+
+        PropTypes::validate($definitions, $properties);
+    }
+
+    public function test_it_can_validate_a_range_of_types()
+    {
+        $definitions = [
+            "array" => PropTypes::array()->isRequired(),
+            "arrayOf" => PropTypes::arrayOf(PropTypes::string())->isRequired(),
+            "bool" => PropTypes::bool()->isRequired(),
+            "boolean" => PropTypes::boolean()->isRequired(),
+            "int" => PropTypes::int()->isRequired(),
+            "integer" => PropTypes::integer()->isRequired(),
+            "objectOfType" => PropTypes::objectOfType(stdClass::class)->isRequired(),
+            "string" => PropTypes::string()->isRequired(),
+        ];
+
+        $properties = [
+            "array" => [1, 2, 3],
+            "arrayOf" => ["1", "2", "3"],
+            "bool" => false,
+            "boolean" => true,
+            "int" => 2,
+            "integer" => 3,
+            "objectOfType" => new stdClass(),
+            "string" => "cats",
+        ];
+
+        PropTypes::validate($definitions, $properties);
+
+        $this->addToAssertionCount(count($definitions));
+    }
+
+    public function test_it_can_tell_non_objects()
+    {
+        $this->expectException(InvalidArgumentException::class, "integer is not objectOfType(stdClass)");
+
+        $definitions = [
+            "objectOfType" => PropTypes::objectOfType(stdClass::class)->isRequired(),
+        ];
+
+        $properties = [
+            "objectOfType" => 1,
+        ];
+
+        PropTypes::validate($definitions, $properties);
+    }
+
+    public function test_it_can_tell_objects_with_wrong_type()
+    {
+        $this->expectException(InvalidArgumentException::class, "Fluent is not objectOfType(stdClass)");
+
+        $definitions = [
+            "objectOfType" => PropTypes::objectOfType(stdClass::class)->isRequired(),
+        ];
+
+        $properties = [
+            "objectOfType" => new Fluent(),
+        ];
+
+        PropTypes::validate($definitions, $properties);
+    }
+
+    public function test_it_can_recognise_missing_object_type()
+    {
+        $this->expectException(InvalidArgumentException::class, "objectOfType missing type");
+
+        PropTypes::objectOfType()->isRequired();
+    }
+
+    public function test_it_can_recognise_unrecognised_types()
+    {
+        $this->expectException(InvalidArgumentException::class, "unknown is not a valid type");
+
+        PropTypes::unknown();
+    }
+
+    public function test_it_can_tell_when_array_of_isnt_array()
+    {
+        $this->expectException(InvalidArgumentException::class, "arrayOf expects string[] but integer provided");
+
+        $definitions = [
+            "arrayOf" => PropTypes::arrayOf(PropTypes::string())->isRequired(),
+        ];
+
+        $properties = [
+            "arrayOf" => 1,
+        ];
+
+        PropTypes::validate($definitions, $properties);
+    }
+
+    public function test_it_can_tell_when_array_of_has_a_bad_type_definition()
+    {
+        $this->expectException(InvalidArgumentException::class, "arrayOf expects string[] but integer provided");
+
+        $definitions = [
+            "arrayOf" => PropTypes::arrayOf("foo")->isRequired(),
+        ];
+
+        $properties = [
+            "arrayOf" => [1, 2, 3],
+        ];
+
+        PropTypes::validate($definitions, $properties);
+    }
+
+    public function test_it_can_tell_array_of_items_types()
+    {
+        $this->expectException(InvalidArgumentException::class, "arrayOf has an unexpected integer in arrayOf(string)");
+
+        $definitions = [
+            "arrayOf" => PropTypes::arrayOf(PropTypes::int())->isRequired(),
+        ];
+
+        $properties = [
+            "arrayOf" => [1, "2", 3],
+        ];
+
+        PropTypes::validate($definitions, $properties);
+    }
+}