1 | "use strict";
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2 | Object.defineProperty(exports, "__esModule", { value: true });
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3 | var tslib_1 = require("tslib");
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4 | function ItoI(a) {
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5 | return a;
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6 | }
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7 | function innerCreateMedium(defaults, middleware) {
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8 | if (middleware === void 0) { middleware = ItoI; }
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9 | var buffer = [];
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10 | var assigned = false;
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11 | var medium = {
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12 | read: function () {
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13 | if (assigned) {
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14 | throw new Error('Sidecar: could not `read` from an `assigned` medium. `read` could be used only with `useMedium`.');
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15 | }
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16 | if (buffer.length) {
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17 | return buffer[buffer.length - 1];
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18 | }
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19 | return defaults;
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20 | },
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21 | useMedium: function (data) {
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22 | var item = middleware(data, assigned);
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23 | buffer.push(item);
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24 | return function () {
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25 | buffer = buffer.filter(function (x) { return x !== item; });
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26 | };
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27 | },
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28 | assignSyncMedium: function (cb) {
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29 | assigned = true;
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30 | while (buffer.length) {
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31 | var cbs = buffer;
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32 | buffer = [];
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33 | cbs.forEach(cb);
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34 | }
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35 | buffer = {
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36 | push: function (x) { return cb(x); },
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37 | filter: function () { return buffer; },
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38 | };
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39 | },
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40 | assignMedium: function (cb) {
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41 | assigned = true;
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42 | var pendingQueue = [];
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43 | if (buffer.length) {
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44 | var cbs = buffer;
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45 | buffer = [];
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46 | cbs.forEach(cb);
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47 | pendingQueue = buffer;
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48 | }
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49 | var executeQueue = function () {
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50 | var cbs = pendingQueue;
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51 | pendingQueue = [];
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52 | cbs.forEach(cb);
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53 | };
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54 | var cycle = function () { return Promise.resolve().then(executeQueue); };
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55 | cycle();
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56 | buffer = {
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57 | push: function (x) {
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58 | pendingQueue.push(x);
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59 | cycle();
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60 | },
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61 | filter: function (filter) {
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62 | pendingQueue = pendingQueue.filter(filter);
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63 | return buffer;
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64 | },
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65 | };
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66 | },
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67 | };
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68 | return medium;
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69 | }
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70 | function createMedium(defaults, middleware) {
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71 | if (middleware === void 0) { middleware = ItoI; }
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72 | return innerCreateMedium(defaults, middleware);
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73 | }
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74 | exports.createMedium = createMedium;
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75 | function createSidecarMedium(options) {
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76 | if (options === void 0) { options = {}; }
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77 | var medium = innerCreateMedium(null);
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78 | medium.options = tslib_1.__assign({ async: true, ssr: false }, options);
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79 | return medium;
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80 | }
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81 | exports.createSidecarMedium = createSidecarMedium;
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