@tsdi/pack/es2015/transforms/TransformActivity.js

@tsdi/pack is simple build tasks, base on AOP, Ioc container, via @tsdi. dev build pack activities.

import { __awaiter } from "tslib";
import { isDefined, PromiseUtil } from '@tsdi/ioc';
import { NodeActivity } from '../NodeActivity';
import { isTransform } from '../ITransform';
/**
 * transform activity.
 *
 * @export
 * @abstract
 * @class TransfrmActivity
 * @extends {NodeActivity<ITransform>}
 */
export class TransformActivity extends NodeActivity {
    /**
     * execute stream pipe.
     *
     * @protected
     * @param {NodeActivityContext} ctx
     * @param {ITransform} stream stream pipe from
     * @param {GActivityType<ITransform>} transform steam pipe to.
     * @param {boolean} [waitend=false] wait pipe end or not.
     * @returns {Promise<ITransform>}
     * @memberof TransformActivity
     */
    pipeStream(ctx, stream, transform, waitend = false) {
        return __awaiter(this, void 0, void 0, function* () {
            let transPipe;
            if (isTransform(transform)) {
                transPipe = transform;
            }
            else {
                transPipe = yield ctx.resolveExpression(transform);
            }
            let next = stream.pipe(transPipe);
            next.once('error', err => {
                console.error(err);
                if (isDefined(process)) {
                    process.exit(1);
                }
                throw err;
            });
            if (waitend) {
                let defer = PromiseUtil.defer();
                next.once('end', defer.resolve);
                yield defer.promise;
            }
            return next;
        });
    }
    static ρAnn() {
        return { "name": "TransformActivity" };
    }
}

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