io-ts-excess/index.js

Decoder for io-ts to check, that object is exactly the same

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const Either_1 = require("fp-ts/lib/Either");
const t = require("io-ts");
function getExcessProps(props, r) {
    const ex = [];
    for (const k of Object.keys(r)) {
        if (!props.hasOwnProperty(k)) {
            ex.push(k);
        }
    }
    return ex;
}
function excess(codec) {
    const r = new t.InterfaceType(codec.name, codec.is, (i, c) => Either_1.either.chain(t.UnknownRecord.validate(i, c), (rec) => {
        const ex = getExcessProps(codec.props, rec);
        return ex.length > 0
            ? t.failure(i, c, `Invalid value ${JSON.stringify(i)} supplied to : ${codec.name}, excess properties: ${JSON.stringify(ex)}`)
            : codec.validate(i, c);
    }), codec.encode, codec.props);
    return r;
}
exports.excess = excess;
exports.default = excess;
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