1 files changed, 130 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/config/config-cache.js b/tools/node_modules/eslint/lib/config/config-cache.js
new file mode 100644
index 0000000000..07436a87c8
--- /dev/null
+++ b/tools/node_modules/eslint/lib/config/config-cache.js
@@ -0,0 +1,130 @@
+/**
+ * @fileoverview Responsible for caching config files
+ * @author Sylvan Mably
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Get a string hash for a config vector
+ * @param {Array<Object>} vector config vector to hash
+ * @returns {string} hash of the vector values
+ * @private
+ */
+function hash(vector) {
+    return JSON.stringify(vector);
+}
+
+//------------------------------------------------------------------------------
+// API
+//------------------------------------------------------------------------------
+
+/**
+ * Configuration caching class
+ */
+module.exports = class ConfigCache {
+
+    constructor() {
+        this.configFullNameCache = new Map();
+        this.localHierarchyCache = new Map();
+        this.mergedVectorCache = new Map();
+        this.mergedCache = new Map();
+    }
+
+    /**
+     * Gets a config object from the cache for the specified config file path.
+     * @param {string} configFullName the name of the configuration as used in the eslint config(e.g. 'plugin:node/recommended'),
+     * or the absolute path to a config file. This should uniquely identify a config.
+     * @returns {Object|null} config object, if found in the cache, otherwise null
+     * @private
+     */
+    getConfig(configFullName) {
+        return this.configFullNameCache.get(configFullName);
+    }
+
+    /**
+     * Sets a config object in the cache for the specified config file path.
+     * @param {string} configFullName the name of the configuration as used in the eslint config(e.g. 'plugin:node/recommended'),
+     * or the absolute path to a config file. This should uniquely identify a config.
+     * @param {Object} config the config object to add to the cache
+     * @returns {void}
+     * @private
+     */
+    setConfig(configFullName, config) {
+        this.configFullNameCache.set(configFullName, config);
+    }
+
+    /**
+     * Gets a list of hierarchy-local config objects that apply to the specified directory.
+     * @param {string} directory the path to the directory
+     * @returns {Object[]|null} a list of config objects, if found in the cache, otherwise null
+     * @private
+     */
+    getHierarchyLocalConfigs(directory) {
+        return this.localHierarchyCache.get(directory);
+    }
+
+    /**
+     * For each of the supplied parent directories, sets the list of config objects for that directory to the
+     * appropriate subset of the supplied parent config objects.
+     * @param {string[]} parentDirectories a list of parent directories to add to the config cache
+     * @param {Object[]} parentConfigs a list of config objects that apply to the lowest directory in parentDirectories
+     * @returns {void}
+     * @private
+     */
+    setHierarchyLocalConfigs(parentDirectories, parentConfigs) {
+        parentDirectories.forEach((localConfigDirectory, i) => {
+            const directoryParentConfigs = parentConfigs.slice(0, parentConfigs.length - i);
+
+            this.localHierarchyCache.set(localConfigDirectory, directoryParentConfigs);
+        });
+    }
+
+    /**
+     * Gets a merged config object corresponding to the supplied vector.
+     * @param {Array<Object>} vector the vector to find a merged config for
+     * @returns {Object|null} a merged config object, if found in the cache, otherwise null
+     * @private
+     */
+    getMergedVectorConfig(vector) {
+        return this.mergedVectorCache.get(hash(vector));
+    }
+
+    /**
+     * Sets a merged config object in the cache for the supplied vector.
+     * @param {Array<Object>} vector the vector to save a merged config for
+     * @param {Object} config the merged config object to add to the cache
+     * @returns {void}
+     * @private
+     */
+    setMergedVectorConfig(vector, config) {
+        this.mergedVectorCache.set(hash(vector), config);
+    }
+
+    /**
+     * Gets a merged config object corresponding to the supplied vector, including configuration options from outside
+     * the vector.
+     * @param {Array<Object>} vector the vector to find a merged config for
+     * @returns {Object|null} a merged config object, if found in the cache, otherwise null
+     * @private
+     */
+    getMergedConfig(vector) {
+        return this.mergedCache.get(hash(vector));
+    }
+
+    /**
+     * Sets a merged config object in the cache for the supplied vector, including configuration options from outside
+     * the vector.
+     * @param {Array<Object>} vector the vector to save a merged config for
+     * @param {Object} config the merged config object to add to the cache
+     * @returns {void}
+     * @private
+     */
+    setMergedConfig(vector, config) {
+        this.mergedCache.set(hash(vector), config);
+    }
+};