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Items returned from this function should be cached by the caller\n * ideally, as recreating the config item will mean re-resolving the item\n * and re-evaluating the plugin/preset function.\n */\nexport function* createConfigItem<API>(\n value:\n | PluginTarget\n | [PluginTarget, PluginOptions]\n | [PluginTarget, PluginOptions, string | void],\n {\n dirname = \".\",\n type,\n }: {\n dirname?: string;\n type?: \"preset\" | \"plugin\";\n } = {},\n): Handler<ConfigItem<API>> {\n const descriptor = yield* createDescriptor(value, path.resolve(dirname), {\n type,\n alias: \"programmatic item\",\n });\n\n return createItemFromDescriptor(descriptor);\n}\n\nconst CONFIG_ITEM_BRAND = Symbol.for(\"@babel/core@7 - ConfigItem\");\n\nexport function getItemDescriptor<API>(\n item: unknown,\n): UnloadedDescriptor<API> | void {\n if ((item as any)?.[CONFIG_ITEM_BRAND]) {\n return (item as ConfigItem<API>)._descriptor;\n }\n\n return undefined;\n}\n\nexport type { ConfigItem };\n\n/**\n * A public representation of a plugin/preset that will _eventually_ be load.\n * Users can use this to interact with the results of a loaded Babel\n * configuration.\n *\n * Any changes to public properties of this class should be considered a\n * breaking change to Babel's API.\n */\nclass ConfigItem<API> {\n /**\n * The private underlying descriptor that Babel actually cares about.\n * If you access this, you are a bad person.\n */\n _descriptor: UnloadedDescriptor<API>;\n\n // TODO(Babel 9): Check if this symbol needs to be updated\n /**\n * Used to detect ConfigItem instances from other Babel instances.\n */\n [CONFIG_ITEM_BRAND] = true;\n\n /**\n * The resolved value of the item itself.\n */\n value: object | Function;\n\n /**\n * The options, if any, that were passed to the item.\n * Mutating this will lead to undefined behavior.\n *\n * \"false\" means that this item has been disabled.\n */\n options: object | void | false;\n\n /**\n * The directory that the options for this item are relative to.\n */\n dirname: string;\n\n /**\n * Get the name of the plugin, if the user gave it one.\n */\n name: string | void;\n\n /**\n * Data about the file that the item was loaded from, if Babel knows it.\n */\n file: {\n // The requested path, e.g. \"@babel/env\".\n request: string;\n // The resolved absolute path of the file.\n resolved: string;\n } | void;\n\n constructor(descriptor: UnloadedDescriptor<API>) {\n // Make people less likely to stumble onto this if they are exploring\n // programmatically, and also make sure that if people happen to\n // pass the item through JSON.stringify, it doesn't show up.\n this._descriptor = descriptor;\n Object.defineProperty(this, \"_descriptor\", { enumerable: false });\n\n Object.defineProperty(this, CONFIG_ITEM_BRAND, { enumerable: false });\n\n this.value = this._descriptor.value;\n this.options = this._descriptor.options;\n this.dirname = this._descriptor.dirname;\n this.name = this._descriptor.name;\n this.file = this._descriptor.file\n ? {\n request: this._descriptor.file.request,\n resolved: this._descriptor.file.resolved,\n }\n : undefined;\n\n // Freeze the object to make it clear that people shouldn't expect mutating\n // this object to do anything. 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