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The **es‑map** package provides a drop‑in replacement for the ES2015 `Map` object that fully follows the ECMAScript specification while still running in environments that only support ES3. It is a shim/polyfill intended for developers who need a standards‑compliant `Map` implementation in older browsers or JavaScript runtimes that lack native support.

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es-shims

es-shims/es-map

An ES2015 spec-compliant `Map` shim/polyfill/replacement that works as far down as ES3.

JavaScript
3
2
MIT License
ljharb's profile
ljharb
66 contributions
nicolo-ribaudo's profile
nicolo-ribaudo
7 contributions

Support the dependencies of es-shims/es-map

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ljharb/call-bound
Robust call-bound JavaScript intrinsics, using `call-bind` and `get-intrinsic`.
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ljharb/es-abstract
ECMAScript spec abstract operations.
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ljharb/System.global
ECMAScript spec-compliant polyfill/shim for `globalThis`
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inspect-js/has-proto
Does this environment have the ability to get the [[Prototype]] of an object on creation with `__proto__`?
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inspect-js/has-symbols
Determine if the JS environment has Symbol support. Supports spec, or shams.
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ES spec-like internal slots
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Does this JS environment support the `name` property on functions?
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