io-ts-types/lib/mapOutput.js

A collection of codecs and combinators for use with io-ts

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
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    Object.defineProperty(o, "default", { enumerable: true, value: v });
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    o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.mapOutput = void 0;
/**
 * @since 0.3.2
 */
var t = __importStar(require("io-ts"));
/**
 * Changes the output type of the given runtime type
 *
 * @example
 * import * as t from 'io-ts'
 * import { mapOutput } from 'io-ts-types/lib/mapOutput'
 * import { optionFromNullable } from 'io-ts-types/lib/optionFromNullable'
 * import { none, some } from 'fp-ts/lib/Option'
 *
 * // Input: t.Type<Option<number>, number | null, t.mixed>
 * const Input = optionFromNullable(t.number)
 *
 * const toUndefined = <A>(x: A | null): A | undefined => (x === null ? undefined : x)
 *
 * // Output: t.Type<Option<number>, number | undefined, t.mixed>
 * const Output = mapOutput(Input, toUndefined)
 *
 * assert.strictEqual(Output.encode(none), undefined)
 * assert.strictEqual(Output.encode(some(1)), 1)
 *
 * @since 0.3.2
 */
function mapOutput(codec, f, name) {
    if (name === void 0) { name = codec.name; }
    return new t.Type(name, codec.is, codec.validate, function (a) { return f(codec.encode(a)); });
}
exports.mapOutput = mapOutput;