forked from validatem/either
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40 lines
1.4 KiB
JavaScript
40 lines
1.4 KiB
JavaScript
"use strict";
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// TODO: Rename this to something more appropriate, like any/anyOf? How to make sure that doesn't cause confusion with `oneOf`?
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const ValidationError = require("@validatem/error");
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const combinator = require("@validatem/combinator");
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module.exports = function (alternatives) {
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if (!Array.isArray(alternatives)) {
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throw new Error(`Must specify an array of alternatives`);
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} else if (alternatives.length < 2) {
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// This doesn't interfere with conditionally-specified alternatives using ternary expressions, because in those cases there is still *some* item specified, it's just going to have a value of `undefined` (and will subsequently be filtered out)
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throw new Error("Must specify at least two alternatives");
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} else if (arguments.length > 1) {
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throw new Error(`Only one argument is accepted; maybe you forgot to wrap the different alternatives into an array?`);
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} else {
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return combinator((value, applyValidators) => {
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let allErrors = [];
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for (let alternative of alternatives) {
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let { errors, newValue } = applyValidators(value, alternative);
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if (errors.length === 0) {
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return newValue;
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} else {
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allErrors.push(...errors);
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}
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}
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let errorList = allErrors
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.map((error) => {
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return `"${error.message}"`;
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})
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.join(", ");
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throw new ValidationError(`Must satisfy at least one of: ${errorList}`, { errors: allErrors });
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});
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}
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};
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