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[`v8-compile-cache`](https://www.npmjs.com/package/v8-compile-cache) exposed as an API for programmatic usage in other libraries and tools.\n\n---\n\n[](https://github.com/cspotcode/v8-compile-cache-lib/actions?query=workflow%3A%22Continuous+Integration%22)\n\n`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.\n\nThe 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/).\n\n## Usage\n\n1. Add the dependency:\n\n ```sh\n $ npm install --save v8-compile-cache-lib\n ```\n\n2. Then, in your entry module add:\n\n ```js\n require('v8-compile-cache-lib').install();\n ```\n\n**`.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`.**\n\n## Options\n\nSet the environment variable `DISABLE_V8_COMPILE_CACHE=1` to disable the cache.\n\nCache directory is defined by environment variable `V8_COMPILE_CACHE_CACHE_DIR` or defaults to `<os.tmpdir()>/v8-compile-cache-<V8_VERSION>`.\n\n## Internals\n\nCache 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.\n\n## Benchmarks\n\nSee https://github.com/cspotcode/v8-compile-cache-lib/tree/master/bench.\n\n**Load Times:**\n\n| Module | Without Cache | With Cache |\n| ---------------- | -------------:| ----------:|\n| `babel-core` | `218ms` | `185ms` |\n| `yarn` | `153ms` | `113ms` |\n| `yarn` (bundled) | `228ms` | `105ms` |\n\n_^ Includes the overhead of loading the cache itself._\n\n## Acknowledgements\n\n* The original [`v8-compile-cache`](https://github.com/zertosh/v8-compile-cache) from which this library is forked.\n* `FileSystemBlobStore` and `NativeCompileCache` are based on Atom's implementation of their v8 compile cache: \n - https://github.com/atom/atom/blob/b0d7a8a/src/file-system-blob-store.js\n - https://github.com/atom/atom/blob/b0d7a8a/src/native-compile-cache.js\n* `mkdirpSync` is based on:\n - https://github.com/substack/node-mkdirp/blob/f2003bb/index.js#L55-L98\n","readmeFilename":"README.md"} |