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bitninja-threat-hunting
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v8-compile-cache-lib
# v8-compile-cache-lib > Fork of [`v8-compile-cache`](https://www.npmjs.com/package/v8-compile-cache) exposed as an API for programmatic usage in other libraries and tools. --- [](https://github.com/cspotcode/v8-compile-cache-lib/actions?query=workflow%3A%22Continuous+Integration%22) `v8-compile-cache-lib` attaches a `require` hook to use [V8's code cache](https://v8project.blogspot.com/2015/07/code-caching.html) 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](https://nodejs.org/en/blog/release/v5.7.0/). ## Usage 1. Add the dependency: ```sh $ npm install --save v8-compile-cache-lib ``` 2. Then, in your entry module add: ```js require('v8-compile-cache-lib').install(); ``` **`.install()` 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-lib`.** ## Options Set the environment variable `DISABLE_V8_COMPILE_CACHE=1` to disable the cache. Cache directory is defined by environment variable `V8_COMPILE_CACHE_CACHE_DIR` or defaults to `<os.tmpdir()>/v8-compile-cache-<V8_VERSION>`. ## Internals Cache files are suffixed `.BLOB` and `.MAP` corresponding to the entry module that required `v8-compile-cache-lib`. 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. ## Benchmarks See https://github.com/cspotcode/v8-compile-cache-lib/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._ ## Acknowledgements * The original [`v8-compile-cache`](https://github.com/zertosh/v8-compile-cache) from which this library is forked. * `FileSystemBlobStore` and `NativeCompileCache` are based on Atom's implementation of their v8 compile cache: - https://github.com/atom/atom/blob/b0d7a8a/src/file-system-blob-store.js - https://github.com/atom/atom/blob/b0d7a8a/src/native-compile-cache.js * `mkdirpSync` is based on: - https://github.com/substack/node-mkdirp/blob/f2003bb/index.js#L55-L98
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