// Ported from js-yaml v3.13.1:
// https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
// Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { Type } from "../type.js";
function resolveYamlNull(data) {
    const max = data.length;
    return ((max === 1 && data === "~") ||
        (max === 4 && (data === "null" || data === "Null" || data === "NULL")));
}
function constructYamlNull() {
    return null;
}
function isNull(object) {
    return object === null;
}
export const nil = new Type("tag:yaml.org,2002:null", {
    construct: constructYamlNull,
    defaultStyle: "lowercase",
    kind: "scalar",
    predicate: isNull,
    represent: {
        canonical() {
            return "~";
        },
        lowercase() {
            return "null";
        },
        uppercase() {
            return "NULL";
        },
        camelcase() {
            return "Null";
        },
    },
    resolve: resolveYamlNull,
});
