@naturalcycles/nodejs-lib/dist/stream/transform/transformMapSimple.js

Standard library for Node.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.transformMapSimple = void 0;
const stream_1 = require("stream");
const js_lib_1 = require("@naturalcycles/js-lib");
/**
 * Simplest version of `transformMap`.
 * errorMode: IMMEDIATE
 * Sync mode.
 * Has 0 options to configure.
 * If you need any configuration - use transformMap or transformMapSync.
 * Sync (not async) version of transformMap.
 * Supposedly faster, for cases when async is not needed.
 */
function transformMapSimple(mapper, opt = {}) {
    let index = -1;
    const { errorMode = js_lib_1.ErrorMode.THROW_IMMEDIATELY, logger = console } = opt;
    return new stream_1.Transform({
        objectMode: true,
        transform(chunk, _, cb) {
            try {
                cb(null, mapper(chunk, ++index));
            }
            catch (err) {
                logger.error(err);
                if (errorMode === js_lib_1.ErrorMode.SUPPRESS) {
                    cb(); // suppress the error
                }
                else {
                    // Emit the error
                    cb(err);
                }
            }
        },
    });
}
exports.transformMapSimple = transformMapSimple;