io-ts-types/lib/withFallback.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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var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
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    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.withFallback = void 0;
/**
 * @since 0.5.0
 */
var t = __importStar(require("io-ts"));
var withValidate_1 = require("./withValidate");
var Either_1 = require("fp-ts/lib/Either");
/**
 * Returns a clone of the given codec that always succeed using the given value `a` if the original codec fails
 *
 * @example
 * import { withFallback } from 'io-ts-types/lib/withFallback'
 * import * as t from 'io-ts'
 * import { right } from 'fp-ts/lib/Either'
 *
 * const T = withFallback(t.number, -1)
 *
 * assert.deepStrictEqual(T.decode(1), right(1))
 * assert.deepStrictEqual(T.decode('a'), right(-1))
 *
 * @since 0.5.0
 */
function withFallback(codec, a, name) {
    if (name === void 0) { name = "withFallback(" + codec.name + ")"; }
    return withValidate_1.withValidate(codec, function (u, c) { return Either_1.orElse(function () { return t.success(a); })(codec.validate(u, c)); }, name);
}
exports.withFallback = withFallback;