dtrim/lib/index.js

A tool for trimming deep/lenghty javascript structures. Some potential usages are: debugging, logging or data sanitization.

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
      desc = { enumerable: true, get: function() { return m[k]; } };
    }
    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
    var ownKeys = function(o) {
        ownKeys = Object.getOwnPropertyNames || function (o) {
            var ar = [];
            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
            return ar;
        };
        return ownKeys(o);
    };
    return function (mod) {
        if (mod && mod.__esModule) return mod;
        var result = {};
        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
        __setModuleDefault(result, mod);
        return result;
    };
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.trimmer = void 0;
const utils = __importStar(require("./utils"));
const OMIT_PROPERTY = Symbol('OMIT_PROPERTY');
const FUNCTION_STUB = '[Function]';
const GETTER_STUB = '[Getter]';
const OBJECT_STUB = '[Object]';
const defaultOpts = {
    depth: 4,
    size: 64,
    string: 512,
    buffer: true,
    getters: true,
    functions: true,
    retain: new Set(),
};
const walker = (opts, node, depth) => {
    var _a;
    if (typeof node === 'string') {
        return node.length > opts.string
            ? `${node.substr(0, opts.string)}...`
            : node;
    }
    if (typeof node === 'number' ||
        typeof node === 'boolean' ||
        typeof node === 'undefined' ||
        node === null) {
        return node;
    }
    if (typeof node === 'function') {
        return opts.functions ? FUNCTION_STUB : OMIT_PROPERTY;
    }
    if (node instanceof Date) {
        return node.toISOString();
    }
    if (depth >= opts.depth) {
        return OBJECT_STUB;
    }
    if (Buffer.isBuffer(node)) {
        return opts.buffer
            ? `Buffer(${node.length})`
            : walker(opts, node.toString('base64'), depth + 1);
    }
    const size = utils.getSize(node);
    if (size > opts.size) {
        if (Array.isArray(node)) {
            return `Array(${size})`;
        }
        return `Object(${size})`;
    }
    const output = Array.isArray(node) ? [] : {};
    if (node instanceof Error) {
        output.message = node.message;
        output.stack = node.stack;
        output.name = node.name;
    }
    for (const key of Object.keys(node)) {
        if (depth === 0 && opts.retain.has(key)) {
            output[key] = node[key];
            continue;
        }
        if (opts.getters === true &&
            ((_a = Object.getOwnPropertyDescriptor(node, key)) === null || _a === void 0 ? void 0 : _a.get)) {
            output[key] = GETTER_STUB;
            continue;
        }
        const result = walker(opts, node[key], depth + 1);
        if (result !== OMIT_PROPERTY) {
            output[key] = result;
        }
    }
    if (opts.getters === false) {
        const prototype = Object.getPrototypeOf(node);
        if (prototype) {
            const methods = Object.getOwnPropertyDescriptors(prototype);
            for (const key in methods) {
                if (methods[key].get) {
                    const result = walker(opts, node[key], depth + 1);
                    if (result !== OMIT_PROPERTY) {
                        output[key] = result;
                    }
                }
            }
        }
    }
    return output;
};
const trimmer = (userOpts) => {
    const opts = { ...defaultOpts, ...userOpts };
    return (input) => {
        if (typeof input !== 'object' || input === null) {
            if (typeof input === 'function') {
                return opts.functions ? FUNCTION_STUB : undefined;
            }
            return input;
        }
        const result = walker(opts, input, 0);
        return result === OMIT_PROPERTY ? undefined : result;
    };
};
exports.trimmer = trimmer;
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