feat(docs): migrate to vitepress with @unovue/reka-ui's theme (#224)

docs/.vitepress/functions/cache.ts

@@ -0,0 +1,39 @@
+// adapted from https://stackoverflow.com/a/46432113/11613622
+// eslint-disable-next-line ts/ban-ts-comment
+// @ts-nocheck
+export class LRUCache {
+  max
+  cache
+  constructor(max = 10) {
+    this.max = max
+    this.cache = new Map()
+  }
+
+  get(key) {
+    const item = this.cache.get(key)
+    if (item !== undefined) {
+      // refresh key
+      this.cache.delete(key)
+      this.cache.set(key, item)
+    }
+    return item
+  }
+
+  set(key, val) {
+    // refresh key
+    if (this.cache.has(key))
+      this.cache.delete(key)
+      // evict oldest
+    else if (this.cache.size === this.max)
+      this.cache.delete(this.first())
+    this.cache.set(key, val)
+  }
+
+  first() {
+    return this.cache.keys().next().value
+  }
+
+  clear() {
+    this.cache.clear()
+  }
+}

docs/.vitepress/functions/flatten.ts

@@ -0,0 +1,8 @@
+export function flatten<T extends Record<string, any>, U extends keyof T>(items: T[], key: U): T[] {
+  return items.reduce((acc: any[], item: T) => {
+    acc.push(item)
+    if (item[key])
+      acc.push(...flatten(item[key], key as any))
+    return acc
+  }, [])
+}