Require hook for automatic V8 compile cache persistence

Usage no npm install needed!

<script type="module">
  import akepinskiV8CompileCache from 'https://cdn.skypack.dev/@akepinski/v8-compile-cache';



Build Status

v8-compile-cache attaches a require hook to use V8's code cache to speed up instantiation time. The "code cache" is the work of parsing and compiling done by V8.

The ability to tap into V8 to produce/consume this cache was introduced in Node v5.7.0.


  1. Add the dependency:
$ npm install --save v8-compile-cache
  1. Then, in your entry module add:

Requiring v8-compile-cache in Node <5.7.0 is a noop – but you need at least Node 4.0.0 to support the ES2015 syntax used by v8-compile-cache.


Set the environment variable DISABLE_V8_COMPILE_CACHE=1 to disable the cache.


The caches are stored in $TMP/v8-compile-cache/V8_VERSION, where there are .BLOB and .MAP files corresponding to the entry module that required v8-compile-cache. The cache is entry module specific because it is faster to load the entire code cache into memory at once, than it is to read it from disk on a file-by-file basis.


See https://github.com/zertosh/v8-compile-cache/tree/master/bench.

Load Times:

Module Without Cache With Cache
babel-core 218ms 185ms
yarn 153ms 113ms
yarn (bundled) 228ms 105ms

^ Includes the overhead of loading the cache itself.