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node_modules/warn-once/README.md

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+# warn-once
+
+Print a warning exactly once during development. Suitable for deprecation warnings, warnings for missing setup etc.
+
+## Installation
+
+Open a Terminal in the project root and run:
+
+```sh
+npm install warn-once
+```
+
+## Usage
+
+The `warnOnce` function accepts a condition as the first argument. If the condition is `true`, then it'll print a warning:
+
+```js
+const warnOnce = require('warn-once');
+
+// ...
+
+warnOnce(someCondition, 'This is a warning message');
+```
+
+You can call `warnOnce` multiple times, but if the warning was printed already, it'll not be printed again.
+
+The warning is only shown during development, i.e. if `NODE_ENV` is not set to `'production'`.