Function stringify

src/functions/json-stringify.ts:31–110

(parent: any, key: string, node: any, level: number)

    };

    const stringify = (parent: any, key: string, node: any, level: number): string =>
    {
        if (node && node.toJSON && typeof node.toJSON === 'function')
        {
            node = node.toJSON();
        }

        if (replacer) 
        {
            node = replacer.call(parent, key, node);
        }

        if (node === undefined) 
        {
            return '';
        }

        if (node === null)
        {
            return 'null';
        }

        if (typeof node === 'number') 
        {
            return isFinite(node) ? String(node) : 'null';
        }

        if (typeof node !== 'object')
        {
            return JSON.stringify(node);
        }

        if (seen.has(node)) 
        {
            return 'null';
        }

        seen.add(node);

        const indent = spacing ? '\n' + indentify(level + 1) : '';
        const closingIndent = spacing ? '\n' + indentify(level) : '';
        const parts = new Array<string>();

        if (Array.isArray(node)) 
        {
            for (let i = 0; i < node.length; i++) 
            {
                const value = stringify(node, String(i), node[i], level + 1) || 'null';

                parts.push(`${indent}${value}`);
            }

            const result = `[${parts.join(',')}${closingIndent}]`;

            seen.delete(node);

            return result;
        }