1 files changed, 77 insertions, 0 deletions
diff --git a/node_modules/swup/src/modules/plugins.ts b/node_modules/swup/src/modules/plugins.ts
new file mode 100644
index 00000000..299d7cb3
--- /dev/null
+++ b/node_modules/swup/src/modules/plugins.ts
@@ -0,0 +1,77 @@
+import type Swup from '../Swup.js';
+
+export type Plugin = {
+	/** Identify as a swup plugin */
+	isSwupPlugin: true;
+	/** Name of this plugin */
+	name: string;
+	/** Version of this plugin. Currently not in use, defined here for backward compatiblity. */
+	version?: string;
+	/** The swup instance that mounted this plugin */
+	swup?: Swup;
+	/** Version requirements of this plugin. Example: `{ swup: '>=4' }` */
+	requires?: Record<string, string | string[]>;
+	/** Run on mount */
+	mount: () => void;
+	/** Run on unmount */
+	unmount: () => void;
+	_beforeMount?: () => void;
+	_afterUnmount?: () => void;
+	_checkRequirements?: () => boolean;
+};
+
+const isSwupPlugin = (maybeInvalidPlugin: unknown): maybeInvalidPlugin is Plugin => {
+	// @ts-ignore: this might be anything, object or no
+	return Boolean(maybeInvalidPlugin?.isSwupPlugin);
+};
+
+/** Install a plugin. */
+export const use = function (this: Swup, plugin: unknown) {
+	if (!isSwupPlugin(plugin)) {
+		console.error('Not a swup plugin instance', plugin);
+		return;
+	}
+
+	plugin.swup = this;
+	if (plugin._checkRequirements) {
+		if (!plugin._checkRequirements()) {
+			return;
+		}
+	}
+	if (plugin._beforeMount) {
+		plugin._beforeMount();
+	}
+	plugin.mount();
+
+	this.plugins.push(plugin);
+
+	return this.plugins;
+};
+
+/** Uninstall a plugin. */
+export function unuse(this: Swup, pluginOrName: Plugin | string) {
+	const plugin = this.findPlugin(pluginOrName);
+	if (!plugin) {
+		console.error('No such plugin', plugin);
+		return;
+	}
+
+	plugin.unmount();
+	if (plugin._afterUnmount) {
+		plugin._afterUnmount();
+	}
+
+	this.plugins = this.plugins.filter((p) => p !== plugin);
+
+	return this.plugins;
+}
+
+/** Find a plugin by name or reference. */
+export function findPlugin(this: Swup, pluginOrName: Plugin | string) {
+	return this.plugins.find(
+		(plugin) =>
+			plugin === pluginOrName ||
+			plugin.name === pluginOrName ||
+			plugin.name === `Swup${String(pluginOrName)}`
+	);
+}