proxy-target

A wrap/unwrap Proxy utility as answer to these weird limitations.

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

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 ...