pjs-rs 0.1.5

A javascript runtime with [pjs](https://github.com/polkadot-js) embebed
Documentation 
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const api = await pjs.api.ApiPromise.create({ provider: new pjs.api.WsProvider('wss://rococo-rpc.polkadot.io') });

// This example set shows how to make queries at a point
const ALICE = '5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY';


// retrieve the balance, once-off at the latest block
const { data: { free } } = await api.query.system.account(ALICE);

console.log('Alice has a current balance of', free.toHuman());

// retrieve balance updates with an optional value callback
const balanceUnsub = await api.query.system.account(ALICE, ({ data: { free } }) => {
  console.log('Alice has an updated balance of', free.toHuman());
});

// retrieve the balance at a block hash in the past
const header = await api.rpc.chain.getHeader();
const prevHash = await api.rpc.chain.getBlockHash(header.number.unwrap().subn(42));
const { data: { free: prev } } = await api.query.system.account.at(prevHash, ALICE);

console.log('Alice had a balance of', prev.toHuman(), '(42 blocks ago)');

// useful in some situations - the value hash and storage entry size
const currHash = await api.query.system.account.hash(ALICE);
const currSize = await api.query.system.account.size(ALICE);

console.log('Alice account entry has a value hash of', currHash, 'with a size of', currSize);