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Add warning when HOST environment variable is set (#3719) #3730

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merged 3 commits into from
Jan 14, 2018
Merged

Add warning when HOST environment variable is set (#3719) #3730

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1f2c4be
Add warning when HOST environment variable is set (#3719)
iansu Jan 10, 2018
0092d96
Improve HOST environment variable warning message
iansu Jan 14, 2018
8e976d1
Adjust text and message
Timer Jan 14, 2018
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13 changes: 13 additions & 0 deletions packages/react-scripts/scripts/start.js
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,19 @@ if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
const HOST = process.env.HOST || '0.0.0.0';

if (process.env.HOST) {
console.log(
chalk.yellow(
"Attempting to bind to $HOST because it was specified. If this was unintentional, check that you haven't mistakenly set it in your shell."
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Shouldn't we inline the HOST value in the message?

Also it's not 100% clear what "$HOST" is. (For example windows uses a different syntax for environment variables.) It is better to explicitly say "environment variable".

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What if it was something more like "Attempting to bind to HOST environment variable somehostname.example.com. If this was..."

)
);
console.log(
chalk.cyan(
'https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#advanced-configuration\n'
)
);
}

// We attempt to use the default port but if it is busy, we offer the user to
// run on a different port. `choosePort()` Promise resolves to the next free port.
choosePort(HOST, DEFAULT_PORT)
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