First try

Author: szepeviktor

.gitattributes

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+/.gitattributes     export-ignore
+/.gitignore         export-ignore
+/.travis.yml        export-ignore
+/source             export-ignore

.gitignore

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+/vendor/
+/composer.lock

composer.json

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+{
+    "name": "php-stubs/wordpress-seo-stubs",
+    "description": "Yoas SEO function and class declaration stubs for static analysis.",
+    "keywords": [
+        "yoast",
+        "seo",
+        "wordpress",
+        "static analysis",
+        "phpstan"
+    ],
+    "homepage": "https://github.com/php-stubs/wordpress-seo-stubs",
+    "license": "MIT",
+    "require": {
+        "php-stubs/wordpress-stubs": "^5.3.0",
+        "psr/log": "^1.0",
+        "league/oauth2-client": "^2.4",
+        "symfony/dependency-injection": "^3.4"
+    },
+    "require-dev": {
+        "php": "~7.1",
+        "giacocorsiglia/stubs-generator": "^0.5.0"
+    },
+    "suggest": {
+        "szepeviktor/phpstan-wordpress": "WordPress extensions for PHPStan",
+        "symfony/polyfill-php73": "Symfony polyfill backporting some PHP 7.3+ features to lower PHP versions"
+    },
+    "minimum-stability": "stable",
+    "scripts": {
+        "post-install-cmd": "@composer --working-dir=source/ install --no-interaction --no-suggest --no-dev",
+        "post-update-cmd" : "@composer --working-dir=source/ install --no-interaction --no-suggest --no-dev",
+        "cleanup": "git status --short --ignored | sed -n -e 's#^!! ##p' | xargs -r rm -vrf"
+    },
+    "scripts-descriptions": {
+        "cleanup": "Remove all ignored files."
+    }
+}

finder.php

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+<?php
+
+return \StubsGenerator\Finder::create()
+    ->in('source/wordpress-seo')
+    ->notPath('admin')
+    ->notPath('cli')
+    ->notPath('config')
+    ->notPath('deprecated')
+    ->notPath('migrations')
+    // Assets.
+    ->notPath('css')
+    ->notPath('images')
+    ->notPath('js')
+    ->notPath('languages')
+    ->sortByName()
+;

generate.sh

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+#!/usr/bin/env bash
+
+HEADER=$'/**\n * Generated stub declarations for WooCommerce.\n * @see https://woocommerce.com\n * @see https://github.com/php-stubs/woocommerce-stubs\n */'
+
+FILE="wordpress-seo-stubs.php"
+
+set -e
+
+test -f "$FILE"
+test -d "source/wordpress-seo"
+
+# Exclude globals.
+"$(dirname "$0")/vendor/bin/generate-stubs" \
+    --force \
+    --finder=finder.php \
+    --header="$HEADER" \
+    --functions \
+    --classes \
+    --interfaces \
+    --traits \
+    --out="$FILE"
+
+# There are no WC functions to read these constants.
+# See define_constants() in includes/class-woocommerce.php
+printf '\nnamespace {\n    %s\n}\n' "define('WPSEO_VERSION', '0.0.0');" >>"$FILE"

source/.gitignore

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+*
+!/.gitignore
+!/composer.json

source/composer.json

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+{
+    "require": {
+        "php": "~7.0",
+        "yoast/wordpress-seo": "12.9.1"
+    },
+    "minimum-stability": "stable",
+    "extra": {
+        "installer-paths": {
+            "{$name}/": [
+                "type:wordpress-plugin"
+            ]
+        }
+    }
+}