node.js - TFS (on premise) build output shown with wrong character-encoding -

we have tfs2015 , build definition following:

when trigger build output wrong character encoding:

2016-09-07t11:40:29.2722404z ΓööΓöÇΓöÇ readable-stream@2.1.5 (buffer-shims@1.0.0, inherits@2.0.1, string_decoder@0.10.31, core-util-is@1.0.2, util-deprecate@1.0.2, process-nextick-args@1.0.7, isarray@1.0.0)      2016-09-07t11:40:29.2722404z run-sequence@1.2.2 node_modules\run-sequence      2016-09-07t11:40:29.2722404z ΓööΓöÇΓöÇ chalk@1.1.3 (supports-color@2.0.0, escape-string-regexp@1.0.5, ansi-styles@2.2.1, strip-ansi@3.0.1, has-ansi@2.0.0)      2016-09-07t11:40:29.2722404z vinyl-source-stream@1.1.0 node_modules\vinyl-source-stream      2016-09-07t11:40:29.2722404z Γö£ΓöÇΓöÇ vinyl@0.4.6 (clone-stats@0.0.1, clone@0.2.0)      2016-09-07t11:40:29.2722404z ΓööΓöÇΓöÇ through2@0.6.5 (xtend@4.0.1, readable-stream@1.0.34)      2016-09-07t11:40:29.2722404z gulp-concat@2.6.0 node_modules\gulp-concat      2016-09-07t11:40:29.2762404z Γö£ΓöÇΓöÇ concat-with-sourcemaps@1.0.4 (source-map@0.5.6)      2016-09-07t11:40:29.2762404z ΓööΓöÇΓöÇ through2@0.6.5 (xtend@4.0.1, readable-stream@1.0.34)      2016-09-07t11:40:29.2762404z vinyl-buffer@1.0.0 node_modules\vinyl-buffer      2016-09-07t11:40:29.2762404z Γö£ΓöÇΓöÇ through2@0.6.5 (xtend@4.0.1, readable-stream@1.0.34) 

any idea how fix it?

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edit: when log build server vm , run npm install command prompt, correct output:

run-sequence@1.2.2 node_modules\run-sequence └── chalk@1.1.3 (escape-string-regexp@1.0.5, ansi-styles@2.2.1, supports-color@2.0.0, has-ansi@2.0.0, strip-ansi@3.0.1)  merge-stream@1.0.0 node_modules\merge-stream └── readable-stream@2.1.5 (inherits@2.0.3, buffer-shims@1.0.0, string_decoder@0.10.31, process-nextick-args@1.0.7, util-deprecate@1.0.2, core-util-is@1.0.2, isarray@1.0.0)  vinyl-source-stream@1.1.0 node_modules\vinyl-source-stream ├── vinyl@0.4.6 (clone-stats@0.0.1, clone@0.2.0) └── through2@0.6.5 (xtend@4.0.1, readable-stream@1.0.34) 

dev-machine environment:

os name:                   microsoft windows 10 enterprise active code page:          437 (both build server , dev machine) system locale:             sk;slovak node version:              5.10.1 npm version:               3.8.5 

build server environment

os name:                   microsoft windows server 2012 r2 standard active code page:          437 (both build server , dev machine) system locale:             en-us;english (united states) node version:              5.10.1 npm version:               3.8.5 

tfs version 14.102.25423.0 (update 3), resides on server, don't have access. see webportal.

steps reproduce:

1. npm init
2. npm install run-sequence --save-dev
3. push tfs git repository
4. create build definition single step: npm install
5. queue new build

i have tried gulp imagemin task in build, couldn't reproduce issue on side. in order narrow down issue, please check:

1. whether tfs 2015 has upgraded latest edition update 3.
2. check whether npm latest version on build server.
3. manually run gulp task on build agent server see whether issue can reproduced.
4. if options above not work, please share detailed setting of build tasks, i'd set same environment check whether issue can reproduced.