mappet/lib/mappet.js

Lightweight, composable mappers for object transformations

"use strict";
var __assign = (this && this.__assign) || function () {
    __assign = Object.assign || function(t) {
        for (var s, i = 1, n = arguments.length; i < n; i++) {
            s = arguments[i];
            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
                t[p] = s[p];
        }
        return t;
    };
    return __assign.apply(this, arguments);
};
Object.defineProperty(exports, "__esModule", { value: true });
var get = require("lodash/get");
function identity(val) {
    return val;
}
function always(_val) {
    return true;
}
function isPath(schemaEntry) {
    return typeof schemaEntry === "string" || Array.isArray(schemaEntry);
}
function mappet(schema, options) {
    if (options === void 0) { options = {}; }
    var strict = options.strict, _a = options.name, name = _a === void 0 ? "Mappet" : _a, greedy = options.greedy;
    return function (source) {
        return Object.keys(schema).reduce(function (result, key) {
            var _a;
            var schemaEntry = schema[key];
            var include = isPath(schemaEntry) ? always : schemaEntry.include || always;
            var path = isPath(schemaEntry) ? schemaEntry : schemaEntry.path;
            var value = get(source, path);
            if (!include(value, source)) {
                return result;
            }
            var modifier = isPath(schemaEntry) ? identity : schemaEntry.modifier || identity;
            if (strict && value === undefined) {
                throw new Error(name + ": " + path + " not found");
            }
            return __assign({}, result, (_a = {}, _a[key] = modifier(value, source), _a));
        }, greedy ? source : {});
    };
}
exports.default = mappet;
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