This project provides an ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill that works in ES3 environments. It's designed for developers who need to use the `flatMap` method in older JavaScript environments that don't natively support it. The package follows the es-shim API interface and can be used both as a standalone function and as a polyfill to add `flatMap` to `Array.prototype`.
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