From 76cb9c2a39d477a64824a985ade40507e3bbade1 Mon Sep 17 00:00:00 2001
From: Adam Mathes <adam@adammathes.com>
Date: Fri, 13 Feb 2026 21:34:48 -0800
Subject: feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

---
 .../undici/lib/cache/memory-cache-store.js         | 234 +++++++++++++++++++++
 1 file changed, 234 insertions(+)
 create mode 100644 vanilla/node_modules/undici/lib/cache/memory-cache-store.js

(limited to 'vanilla/node_modules/undici/lib/cache/memory-cache-store.js')

diff --git a/vanilla/node_modules/undici/lib/cache/memory-cache-store.js b/vanilla/node_modules/undici/lib/cache/memory-cache-store.js
new file mode 100644
index 0000000..dba29ae
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/cache/memory-cache-store.js
@@ -0,0 +1,234 @@
+'use strict'
+
+const { Writable } = require('node:stream')
+const { EventEmitter } = require('node:events')
+const { assertCacheKey, assertCacheValue } = require('../util/cache.js')
+
+/**
+ * @typedef {import('../../types/cache-interceptor.d.ts').default.CacheKey} CacheKey
+ * @typedef {import('../../types/cache-interceptor.d.ts').default.CacheValue} CacheValue
+ * @typedef {import('../../types/cache-interceptor.d.ts').default.CacheStore} CacheStore
+ * @typedef {import('../../types/cache-interceptor.d.ts').default.GetResult} GetResult
+ */
+
+/**
+ * @implements {CacheStore}
+ * @extends {EventEmitter}
+ */
+class MemoryCacheStore extends EventEmitter {
+  #maxCount = 1024
+  #maxSize = 104857600 // 100MB
+  #maxEntrySize = 5242880 // 5MB
+
+  #size = 0
+  #count = 0
+  #entries = new Map()
+  #hasEmittedMaxSizeEvent = false
+
+  /**
+   * @param {import('../../types/cache-interceptor.d.ts').default.MemoryCacheStoreOpts | undefined} [opts]
+   */
+  constructor (opts) {
+    super()
+    if (opts) {
+      if (typeof opts !== 'object') {
+        throw new TypeError('MemoryCacheStore options must be an object')
+      }
+
+      if (opts.maxCount !== undefined) {
+        if (
+          typeof opts.maxCount !== 'number' ||
+          !Number.isInteger(opts.maxCount) ||
+          opts.maxCount < 0
+        ) {
+          throw new TypeError('MemoryCacheStore options.maxCount must be a non-negative integer')
+        }
+        this.#maxCount = opts.maxCount
+      }
+
+      if (opts.maxSize !== undefined) {
+        if (
+          typeof opts.maxSize !== 'number' ||
+          !Number.isInteger(opts.maxSize) ||
+          opts.maxSize < 0
+        ) {
+          throw new TypeError('MemoryCacheStore options.maxSize must be a non-negative integer')
+        }
+        this.#maxSize = opts.maxSize
+      }
+
+      if (opts.maxEntrySize !== undefined) {
+        if (
+          typeof opts.maxEntrySize !== 'number' ||
+          !Number.isInteger(opts.maxEntrySize) ||
+          opts.maxEntrySize < 0
+        ) {
+          throw new TypeError('MemoryCacheStore options.maxEntrySize must be a non-negative integer')
+        }
+        this.#maxEntrySize = opts.maxEntrySize
+      }
+    }
+  }
+
+  /**
+   * Get the current size of the cache in bytes
+   * @returns {number} The current size of the cache in bytes
+   */
+  get size () {
+    return this.#size
+  }
+
+  /**
+   * Check if the cache is full (either max size or max count reached)
+   * @returns {boolean} True if the cache is full, false otherwise
+   */
+  isFull () {
+    return this.#size >= this.#maxSize || this.#count >= this.#maxCount
+  }
+
+  /**
+   * @param {import('../../types/cache-interceptor.d.ts').default.CacheKey} req
+   * @returns {import('../../types/cache-interceptor.d.ts').default.GetResult | undefined}
+   */
+  get (key) {
+    assertCacheKey(key)
+
+    const topLevelKey = `${key.origin}:${key.path}`
+
+    const now = Date.now()
+    const entries = this.#entries.get(topLevelKey)
+
+    const entry = entries ? findEntry(key, entries, now) : null
+
+    return entry == null
+      ? undefined
+      : {
+          statusMessage: entry.statusMessage,
+          statusCode: entry.statusCode,
+          headers: entry.headers,
+          body: entry.body,
+          vary: entry.vary ? entry.vary : undefined,
+          etag: entry.etag,
+          cacheControlDirectives: entry.cacheControlDirectives,
+          cachedAt: entry.cachedAt,
+          staleAt: entry.staleAt,
+          deleteAt: entry.deleteAt
+        }
+  }
+
+  /**
+   * @param {import('../../types/cache-interceptor.d.ts').default.CacheKey} key
+   * @param {import('../../types/cache-interceptor.d.ts').default.CacheValue} val
+   * @returns {Writable | undefined}
+   */
+  createWriteStream (key, val) {
+    assertCacheKey(key)
+    assertCacheValue(val)
+
+    const topLevelKey = `${key.origin}:${key.path}`
+
+    const store = this
+    const entry = { ...key, ...val, body: [], size: 0 }
+
+    return new Writable({
+      write (chunk, encoding, callback) {
+        if (typeof chunk === 'string') {
+          chunk = Buffer.from(chunk, encoding)
+        }
+
+        entry.size += chunk.byteLength
+
+        if (entry.size >= store.#maxEntrySize) {
+          this.destroy()
+        } else {
+          entry.body.push(chunk)
+        }
+
+        callback(null)
+      },
+      final (callback) {
+        let entries = store.#entries.get(topLevelKey)
+        if (!entries) {
+          entries = []
+          store.#entries.set(topLevelKey, entries)
+        }
+        const previousEntry = findEntry(key, entries, Date.now())
+        if (previousEntry) {
+          const index = entries.indexOf(previousEntry)
+          entries.splice(index, 1, entry)
+          store.#size -= previousEntry.size
+        } else {
+          entries.push(entry)
+          store.#count += 1
+        }
+
+        store.#size += entry.size
+
+        // Check if cache is full and emit event if needed
+        if (store.#size > store.#maxSize || store.#count > store.#maxCount) {
+          // Emit maxSizeExceeded event if we haven't already
+          if (!store.#hasEmittedMaxSizeEvent) {
+            store.emit('maxSizeExceeded', {
+              size: store.#size,
+              maxSize: store.#maxSize,
+              count: store.#count,
+              maxCount: store.#maxCount
+            })
+            store.#hasEmittedMaxSizeEvent = true
+          }
+
+          // Perform eviction
+          for (const [key, entries] of store.#entries) {
+            for (const entry of entries.splice(0, entries.length / 2)) {
+              store.#size -= entry.size
+              store.#count -= 1
+            }
+            if (entries.length === 0) {
+              store.#entries.delete(key)
+            }
+          }
+
+          // Reset the event flag after eviction
+          if (store.#size < store.#maxSize && store.#count < store.#maxCount) {
+            store.#hasEmittedMaxSizeEvent = false
+          }
+        }
+
+        callback(null)
+      }
+    })
+  }
+
+  /**
+   * @param {CacheKey} key
+   */
+  delete (key) {
+    if (typeof key !== 'object') {
+      throw new TypeError(`expected key to be object, got ${typeof key}`)
+    }
+
+    const topLevelKey = `${key.origin}:${key.path}`
+
+    for (const entry of this.#entries.get(topLevelKey) ?? []) {
+      this.#size -= entry.size
+      this.#count -= 1
+    }
+    this.#entries.delete(topLevelKey)
+  }
+}
+
+function findEntry (key, entries, now) {
+  return entries.find((entry) => (
+    entry.deleteAt > now &&
+    entry.method === key.method &&
+    (entry.vary == null || Object.keys(entry.vary).every(headerName => {
+      if (entry.vary[headerName] === null) {
+        return key.headers[headerName] === undefined
+      }
+
+      return entry.vary[headerName] === key.headers[headerName]
+    }))
+  ))
+}
+
+module.exports = MemoryCacheStore
-- 
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