Build (scripts/build.js) fail

[ghost]

160894 warn optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.0.0 (node_modules\chokidar\node_modules\fsevents):
160895 warn notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
160896 verbose notsup SKIPPING OPTIONAL DEPENDENCY: Valid OS:    darwin
160896 verbose notsup SKIPPING OPTIONAL DEPENDENCY: Valid Arch:  any
160896 verbose notsup SKIPPING OPTIONAL DEPENDENCY: Actual OS:   win32
160896 verbose notsup SKIPPING OPTIONAL DEPENDENCY: Actual Arch: x64
160897 warn optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.2.7 (node_modules\watchpack\node_modules\chokidar\node_modules\fsevents):
160898 warn notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
160899 verbose notsup SKIPPING OPTIONAL DEPENDENCY: Valid OS:    darwin
160899 verbose notsup SKIPPING OPTIONAL DEPENDENCY: Valid Arch:  any
160899 verbose notsup SKIPPING OPTIONAL DEPENDENCY: Actual OS:   win32
160899 verbose notsup SKIPPING OPTIONAL DEPENDENCY: Actual Arch: x64
160900 warn [email protected] requires a peer of ajv@^5.0.0 but none was installed.
160901 verbose If you need help, you may report this error at:
160901 verbose     <https://github.com/npm/npm/issues>
160902 verbose stack Error: [email protected] postinstall: `node scripts/build.js`
160902 verbose stack Exit status 1
160902 verbose stack     at EventEmitter.<anonymous> (C:\Users\***\AppData\Roaming\npm\node_modules\npm\lib\utils\lifecycle.js:255:16)
160902 verbose stack     at EventEmitter.emit (events.js:203:13)
160902 verbose stack     at ChildProcess.<anonymous> (C:\Users\***\AppData\Roaming\npm\node_modules\npm\lib\utils\spawn.js:40:14)
160902 verbose stack     at ChildProcess.emit (events.js:203:13)
160902 verbose stack     at maybeClose (internal/child_process.js:1021:16)
160902 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)
160903 verbose pkgid [email protected]
160904 verbose cwd C:\Users\***\Desktop\ionic-background-geolocation
160905 error Windows_NT 10.0.17763
160906 error argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\***\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "install"
160907 error node v12.6.0
160908 error npm  v3.10.10
160909 error code ELIFECYCLE
160910 error [email protected] postinstall: `node scripts/build.js`
160910 error Exit status 1
160911 error Failed at the [email protected] postinstall script 'node scripts/build.js'.
160911 error Make sure you have the latest version of node.js and npm installed.
160911 error If you do, this is most likely a problem with the node-sass package,
160911 error not with npm itself.
160911 error Tell the author that this fails on your system:
160911 error     node scripts/build.js
160911 error You can get information on how to open an issue for this project with:
160911 error     npm bugs node-sass
160911 error Or if that isn't available, you can get their info via:
160911 error     npm owner ls node-sass
160911 error There is likely additional logging output above.
160912 verbose exit [ 1, true ]