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Use sync fs.mkdir

Summary:
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This ensures that errors are actually noticed in case it is not
possible to create the directory. This will also throw an error when used with the upcoming Node.js 10.x because there is no callback.

Refs: nodejs/node#18668

[CLI][MINOR][local-cli/library/library.js] - Use sync fs.mkdir for error handling
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  CATEGORY
[----------]        TYPE
[ CLI      ]   [-------------]      LOCATION
[ DOCS     ]   [ BREAKING    ]   [-------------]
[ GENERAL  ]   [ BUGFIX      ]   [-{Component}-]
[ INTERNAL ]   [ ENHANCEMENT ]   [ {File}      ]
[ IOS      ]   [ FEATURE     ]   [ {Directory} ]   |-----------|
[ ANDROID  ]   [ MINOR       ]   [ {Framework} ] - | {Message} |
[----------]   [-------------]   [-------------]   |-----------|

[CATEGORY] [TYPE] [LOCATION] - MESSAGE

 EXAMPLES:

 [IOS] [BREAKING] [FlatList] - Change a thing that breaks other things
 [ANDROID] [BUGFIX] [TextInput] - Did a thing to TextInput
 [CLI] [FEATURE] [local-cli/info/info.js] - CLI easier to do things with
 [DOCS] [BUGFIX] [GettingStarted.md] - Accidentally a thing/word
 [GENERAL] [ENHANCEMENT] [Yoga] - Added new yoga thing/position
 [INTERNAL] [FEATURE] [./scripts] - Added thing to script that nobody will see
-->
Closes #18084

Differential Revision: D7083122

Pulled By: shergin

fbshipit-source-id: a13b64e57860e1ab2c15e0c008211dc0dca3b2d2
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BridgeAR authored and facebook-github-bot committed Feb 26, 2018
1 parent a534672 commit d2817f48a1146b469d544ee78015251551d358c3
Showing with 1 addition and 1 deletion.
  1. +1 −1 local-cli/library/library.js
@@ -29,7 +29,7 @@ function library(argv, config, args) {
const source = path.resolve('node_modules', 'react-native', 'Libraries', 'Sample');
if (!fs.existsSync(libraries)) {
fs.mkdir(libraries);
fs.mkdirSync(libraries);
}
if (fs.existsSync(libraryDest)) {

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