Please find below output of ionic build browser --verbose
ionic:cli-utils Terminal info: { tty: true, ci: false } +0ms
ionic:cli-utils CLI global options: { _: [ 'build', 'browser' ], help: null, h: null, verbose: true, quiet: null, interactive: true, color: true, confirm: null, json: null, project: null, '--': [] } +0ms
ionic:cli-utils:lib:project Project type from config: ionic/angular 4 (angular) +0ms
ionic:cli-utils Project name: undefined +12s
ionic:cli Context: { binPath: 'C:\\Users\\test\\AppData\\Roaming\\npm\\node_modules\\ionic\\bin\\ionic', libPath: 'C:\\Users\\test\\AppData\\Roaming\\npm\\node_modules\\ionic', execPath: 'D:\\test\\Ionic\\Ionic4_proj\\myAppLatest', version: '4.1.1' }
+0ms
[WARN] ionic build is for building web assets and takes no arguments. See ionic build --help.
Ignoring argument browser. Perhaps you meant ionic cordova build browser?
ionic:cli-utils:lib:hooks Looking for ionic:build:before npm script. +0ms
ionic:cli-utils:lib:build Looking for ionic:build npm script. +0ms
> ng run app:build
Date: 2018-09-03T09:49:07.865Z
Hash: d9751bc45b0bc752e0be
Time: 26123ms
chunk {common} common.js, common.js.map (common) 8.55 kB [rendered]
chunk {main} main.js, main.js.map (main) 12.9 kB [initial] [rendered]
chunk {polyfills} polyfills.js, polyfills.js.map (polyfills) 226 kB [initial] [rendered]
chunk {runtime} runtime.js, runtime.js.map (runtime) 8.02 kB [entry] [rendered]
chunk {styles} styles.js, styles.js.map (styles) 36.1 kB [initial] [rendered]
chunk {tabs-tabs-module} tabs-tabs-module.js, tabs-tabs-module.js.map (tabs-tabs-module) 26.7 kB [rendered]
chunk {129} 129.js, 129.js.map () 14.9 kB [rendered]
chunk {vendor} vendor.js, vendor.js.map (vendor) 3.91 MB [initial] [rendered]
chunk {0} 0.js, 0.js.map () 46 kB [rendered]
chunk {1} 1.js, 1.js.map () 43.6 kB [rendered]
chunk {2} 2.js, 2.js.map () 45.6 kB [rendered]
chunk {3} 3.js, 3.js.map () 43.4 kB [rendered]
chunk {4} 4.js, 4.js.map () 1.74 kB [rendered]
chunk {5} 5.js, 5.js.map () 1.69 kB [rendered]
chunk {6} 6.js, 6.js.map () 209 kB [rendered]
chunk {7} 7.js, 7.js.map () 204 kB [rendered]
chunk {8} 8.js, 8.js.map () 209 kB [rendered]
chunk {9} 9.js, 9.js.map () 204 kB [rendered]
chunk {10} 10.js, 10.js.map () 13.5 kB [rendered]
chunk {11} 11.js, 11.js.map () 12.3 kB [rendered]
chunk {12} 12.js, 12.js.map () 12.5 kB [rendered]
chunk {13} 13.js, 13.js.map () 9.23 kB [rendered]
chunk {14} 14.js, 14.js.map () 9.11 kB [rendered]
chunk {15} 15.js, 15.js.map () 9.22 kB [rendered]
chunk {16} 16.js, 16.js.map () 9.1 kB [rendered]
chunk {17} 17.js, 17.js.map () 11.4 kB [rendered]
chunk {18} 18.js, 18.js.map () 11.1 kB [rendered]
chunk {19} 19.js, 19.js.map () 11.4 kB [rendered]
chunk {20} 20.js, 20.js.map () 11.2 kB [rendered]
chunk {21} 21.js, 21.js.map () 3.52 kB [rendered]
chunk {22} 22.js, 22.js.map () 3.44 kB [rendered]
chunk {23} 23.js, 23.js.map () 3.51 kB [rendered]
chunk {24} 24.js, 24.js.map () 3.43 kB [rendered]
chunk {25} 25.js, 25.js.map () 20.2 kB [rendered]
chunk {26} 26.js, 26.js.map () 19.5 kB [rendered]
chunk {27} 27.js, 27.js.map () 19.9 kB [rendered]
chunk {28} 28.js, 28.js.map () 19.3 kB [rendered]
chunk {29} 29.js, 29.js.map () 14.1 kB [rendered]
chunk {30} 30.js, 30.js.map () 14 kB [rendered]
chunk {31} 31.js, 31.js.map () 9.68 kB [rendered]
chunk {32} 32.js, 32.js.map () 9.55 kB [rendered]
chunk {33} 33.js, 33.js.map () 9.39 kB [rendered]
chunk {34} 34.js, 34.js.map () 9.28 kB [rendered]
chunk {35} 35.js, 35.js.map () 11.3 kB [rendered]
chunk {36} 36.js, 36.js.map () 11.1 kB [rendered]
chunk {37} 37.js, 37.js.map () 11.4 kB [rendered]
chunk {38} 38.js, 38.js.map () 11.2 kB [rendered]
chunk {39} 39.js, 39.js.map () 10.7 kB [rendered]
chunk {40} 40.js, 40.js.map () 10.5 kB [rendered]
chunk {41} 41.js, 41.js.map () 7.25 kB [rendered]
chunk {42} 42.js, 42.js.map () 7.08 kB [rendered]
chunk {43} 43.js, 43.js.map () 35.8 kB [rendered]
chunk {44} 44.js, 44.js.map () 35.7 kB [rendered]
chunk {45} 45.js, 45.js.map () 17.4 kB [rendered]
chunk {46} 46.js, 46.js.map () 16.7 kB [rendered]
chunk {47} 47.js, 47.js.map () 17.3 kB [rendered]
chunk {48} 48.js, 48.js.map () 16.7 kB [rendered]
chunk {49} 49.js, 49.js.map () 4.56 kB [rendered]
chunk {50} 50.js, 50.js.map () 2.48 kB [rendered]
chunk {51} 51.js, 51.js.map () 2.45 kB [rendered]
chunk {52} 52.js, 52.js.map () 12.7 kB [rendered]
chunk {53} 53.js, 53.js.map () 12.7 kB [rendered]
chunk {54} 54.js, 54.js.map () 15.6 kB [rendered]
chunk {55} 55.js, 55.js.map () 15.2 kB [rendered]
chunk {56} 56.js, 56.js.map () 15.5 kB [rendered]
chunk {57} 57.js, 57.js.map () 15.1 kB [rendered]
chunk {58} 58.js, 58.js.map () 24.5 kB [rendered]
chunk {59} 59.js, 59.js.map () 23.2 kB [rendered]
chunk {60} 60.js, 60.js.map () 24.7 kB [rendered]
chunk {61} 61.js, 61.js.map () 23.5 kB [rendered]
chunk {62} 62.js, 62.js.map () 11 kB [rendered]
chunk {63} 63.js, 63.js.map () 10.9 kB [rendered]
chunk {64} 64.js, 64.js.map () 15.6 kB [rendered]
chunk {65} 65.js, 65.js.map () 15.4 kB [rendered]
chunk {66} 66.js, 66.js.map () 18.6 kB [rendered]
chunk {67} 67.js, 67.js.map () 18.1 kB [rendered]
chunk {68} 68.js, 68.js.map () 18.5 kB [rendered]
chunk {69} 69.js, 69.js.map () 18.1 kB [rendered]
chunk {70} 70.js, 70.js.map () 11.2 kB [rendered]
chunk {71} 71.js, 71.js.map () 11.3 kB [rendered]
chunk {72} 72.js, 72.js.map () 2.8 kB [rendered]
chunk {73} 73.js, 73.js.map () 14.1 kB [rendered]
chunk {74} 74.js, 74.js.map () 13.6 kB [rendered]
chunk {75} 75.js, 75.js.map () 2.93 kB [rendered]
chunk {76} 76.js, 76.js.map () 19.4 kB [rendered]
chunk {77} 77.js, 77.js.map () 19 kB [rendered]
chunk {78} 78.js, 78.js.map () 21.1 kB [rendered]
chunk {79} 79.js, 79.js.map () 20.5 kB [rendered]
chunk {80} 80.js, 80.js.map () 15.7 kB [rendered]
chunk {81} 81.js, 81.js.map () 15.6 kB [rendered]
chunk {82} 82.js, 82.js.map () 7.73 kB [rendered]
chunk {83} 83.js, 83.js.map () 2.9 kB [rendered]
chunk {84} 84.js, 84.js.map () 2.85 kB [rendered]
chunk {85} 85.js, 85.js.map () 14.9 kB [rendered]
chunk {86} 86.js, 86.js.map () 18.3 kB [rendered]
chunk {87} 87.js, 87.js.map () 16.9 kB [rendered]
chunk {88} 88.js, 88.js.map () 16.7 kB [rendered]
chunk {89} 89.js, 89.js.map () 16.1 kB [rendered]
chunk {90} 90.js, 90.js.map () 14 kB [rendered]
chunk {91} 91.js, 91.js.map () 13.5 kB [rendered]
chunk {92} 92.js, 92.js.map () 13.3 kB [rendered]
chunk {93} 93.js, 93.js.map () 13 kB [rendered]
chunk {94} 94.js, 94.js.map () 9.05 kB [rendered]
chunk {95} 95.js, 95.js.map () 1.6 kB [rendered]
chunk {96} 96.js, 96.js.map () 11.4 kB [rendered]
chunk {97} 97.js, 97.js.map () 11.1 kB [rendered]
chunk {98} 98.js, 98.js.map () 9.7 kB [rendered]
chunk {99} 99.js, 99.js.map () 9.71 kB [rendered]
chunk {100} 100.js, 100.js.map () 27.4 kB [rendered]
chunk {101} 101.js, 101.js.map () 26.1 kB [rendered]
chunk {102} 102.js, 102.js.map () 27.8 kB [rendered]
chunk {103} 103.js, 103.js.map () 26.7 kB [rendered]
chunk {104} 104.js, 104.js.map () 6.59 kB [rendered]
chunk {105} 105.js, 105.js.map () 6.57 kB [rendered]
chunk {106} 106.js, 106.js.map () 12.7 kB [rendered]
chunk {107} 107.js, 107.js.map () 12.5 kB [rendered]
chunk {108} 108.js, 108.js.map () 12.7 kB [rendered]
chunk {109} 109.js, 109.js.map () 12.5 kB [rendered]
chunk {110} 110.js, 110.js.map () 15.5 kB [rendered]
chunk {111} 111.js, 111.js.map () 15.4 kB [rendered]
chunk {112} 112.js, 112.js.map () 15.9 kB [rendered]
chunk {113} 113.js, 113.js.map () 15.4 kB [rendered]
chunk {114} 114.js, 114.js.map () 14.8 kB [rendered]
chunk {115} 115.js, 115.js.map () 14.5 kB [rendered]
chunk {116} 116.js, 116.js.map () 11.5 kB [rendered]
chunk {117} 117.js, 117.js.map () 14.7 kB [rendered]
chunk {118} 118.js, 118.js.map () 1.28 kB [rendered]
chunk {119} 119.js, 119.js.map () 2.36 kB [rendered]
chunk {120} 120.js, 120.js.map () 1.39 kB [rendered]
chunk {121} 121.js, 121.js.map () 8.11 kB [rendered]
chunk {122} 122.js, 122.js.map () 5.15 kB [rendered]
chunk {123} 123.js, 123.js.map () 9.87 kB [rendered]
chunk {124} 124.js, 124.js.map () 4.67 kB [rendered]
chunk {125} 125.js, 125.js.map () 1.8 kB [rendered]
chunk {126} 126.js, 126.js.map () 1.03 kB [rendered]
chunk {127} 127.js, 127.js.map () 3.49 kB [rendered]
chunk {128} 128.js, 128.js.map () 7.29 kB [rendered]
ionic:cli-utils:lib:hooks Looking for ionic:build:after npm script. +2m