json-oneline-stringify/dist/index.js

A little function for stringifying into a single line, in a readable form.

/* MAIN */
function stringify(input) {
    const type = typeof input;
    if (type === 'string' || type === 'number')
        return JSON.stringify(input);
    if (type === 'boolean')
        return input ? 'true' : 'false';
    if (type === 'object') {
        if (input === null) {
            return 'null';
        }
        else if (Array.isArray(input)) {
            let children = '';
            for (let i = 0, l = input.length; i < l; i++) {
                const value = input[i];
                const child = stringify(value);
                if (child === undefined)
                    continue;
                children += children ? `, ${child}` : child;
            }
            return `[${children}]`;
        }
        else {
            let children = '';
            for (const prop in input) {
                const value = stringify(input[prop]);
                if (value === undefined)
                    continue;
                const key = stringify(prop);
                children += children ? `, ${key}: ${value}` : `${key}: ${value}`;
            }
            return children ? `{ ${children} }` : '{}';
        }
    }
    if (type === 'undefined' || type === 'function' || type === 'symbol')
        return;
    throw new Error(`Unsupported type: "${type}"`);
}
/* EXPORT */
export default stringify;