piral-debug-utils/lib/decycle.js

Utilities for debugging Piral instances.

export function decycle(obj) {
    const objects = [];
    const paths = [];
    const derez = (value, path) => {
        const _value = value && value.toJSON instanceof Function ? value.toJSON() : value;
        if (_value === null || _value === undefined) {
            return undefined;
        }
        else if (typeof _value === 'function') {
            return `<function>`;
        }
        else if (_value instanceof Error) {
            return `<error>`;
        }
        else if (_value instanceof Node) {
            return `<node>`;
        }
        else if (_value['$$typeof'] === Symbol.for('react.element')) {
            return '<react.element>';
        }
        else if (typeof _value === 'object') {
            for (let i = 0; i < objects.length; i++) {
                if (objects[i] === _value) {
                    return { $ref: paths[i] };
                }
            }
            objects.push(_value);
            paths.push(path);
            if (Array.isArray(_value)) {
                const nu = [];
                for (let i = 0; i < _value.length; i += 1) {
                    nu[i] = derez(_value[i], `${path}[${i}]`);
                }
                return nu;
            }
            else {
                const nu = {};
                for (const name in _value) {
                    if (Object.prototype.hasOwnProperty.call(_value, name)) {
                        nu[name] = derez(_value[name], `${path}[${JSON.stringify(name)}]`);
                    }
                }
                return nu;
            }
        }
        else if (typeof _value === 'symbol') {
            return '<symbol>';
        }
        else if (typeof _value === 'bigint') {
            return '<bigint>';
        }
        return _value;
    };
    return derez(obj, '$');
}
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