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30 lines
785 B
JavaScript
30 lines
785 B
JavaScript
"use strict";
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const Promise = require("bluebird");
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const propagateAbort = require("@promistream/propagate-abort");
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const propagatePeek = require("@promistream/propagate-peek");
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const { validateArguments } = require("@validatem/core");
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const required = require("@validatem/required");
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const isFunction = require("@validatem/is-function");
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module.exports = function mapStream(_mapCallback) {
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let [ mapCallback ] = validateArguments(arguments, {
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mapCallback: [ required, isFunction ]
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});
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return {
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_promistreamVersion: 0,
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description: `map stream`,
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abort: propagateAbort,
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peek: propagatePeek,
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read: function produceValue_mapStream(source) {
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return Promise.try(() => {
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return source.read();
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}).then((value) => {
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return mapCallback(value);
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});
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}
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};
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};
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