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# proxy-target
[](https://github.com/WebReflection/proxy-target/actions) [](https://coveralls.io/github/WebReflection/proxy-target?branch=main)
A wrap/unwrap Proxy utility as answer to [these](https://es.discourse.group/t/the-array-isarray-shenanigans/1745) weird [limitations](https://es.discourse.group/t/proxy-drilling-once-again/1850).
This module allows any primitive to complex value to be proxied in a way that any handler can understand once the `unwrap(target)` operation is performed among actions:
* *callbacks* remain callbacks and *arrays* remain arrays unless `proxy-target/array` is used
* *primitives* and *null*, *undefined* or *object* generic types are preserved, among any other primitive, and return `{type: actualType, value: actualValue}` once wrapped
## Type / Value -> Wrap
| type | value | wrap |
| :------------ | :------------- | :-------------------------------------- |
| `"array"` | `[1, 2]` | `[1, 2]` or `[[1,2]]` w/array |
| `"bigint"` | `1n` | `{type: "bigint", value: 1n}` |
| `"boolean"` | `false` | `{type: "boolean", value: false}` |
| `"function"` | `(a, b) => {}` | `(a, b) => {}` or `Ctx.bind(fn)` w/all |
| `"null"` | `null` | `{type: "null", value: null}` |
| `"number"` | `1.2` | `{type: "number", value: 1.2}` |
| `"object"` | `{a: 0}` | `{type: "object", value: {a: 0}}` |
| `"string"` | `""` | `{type: "string", value: ""}` |
| `"symbol"` | `Symbol()` | `{type: "symbol", value: Symbol()}` |
| `"undefined"` | `void 0` | `{type: "undefined", value: undefined}` |
| | | |
| `"custom"` | `notArrOrFunc` | `{type: "custom", value: notArrOrFunc}` |
## Example / API
```js
import {
bound, // return a function that returns its bound context
unbound,// if function, invokes it to return the context
target, // create a `{type, value}` pair to proxy as target
wrap, // returns array, function, or a pair
unwrap // returns the wrapped value
} from 'proxy-target';
let proxied;
proxied = wrap([1, 2, 3]);
// remains [1, 2, 3]
unwrap(proxied);
// still [1, 2, 3]
// both wrap and unwrap accept an optional callback
// the returned value will the one returned by wrap
proxied = wrap({a: 1}, (type, value) => target(type, value));
// {type: "object", value: {a: 1}}
unwrap(proxied, (type, value) => value);
// {a: 1}
proxied = wrap(i => i + 123);
// remains i => i + 123
unwrap(proxied);
// i => i + 123
// bound / unbound
const callbacks = [
a => a + 1,
b => b + 2
];
proxied = wrap(
callbacks[1],
(type, value) => bound(
target(type, callbacks.indexOf(value))
)
);
// function () { return {type: "function", value: 1} );
unwrap(unbound(proxied), (type, value) => {
return type === "function" ? callbacks[value] : value;
});
// b => b + 2
proxied = wrap(null);
// {type: "null", value: null}
unwrap(proxied);
// null
proxied = wrap(1);
// {type: "number", value: 1}
unwrap(proxied);
// 1
proxied = wrap(false);
// {type: "boolean", value: false}
unwrap(proxied);
// false
proxied = wrap(Symbol());
// {type: "symbol", value: thatSymbol}
unwrap(proxied);
// thatSymbol
// ... and so on ...
```
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