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/**
* Babel plugin that wraps `warn` calls with development check to be
* completely stripped from the production bundle.
*
* In the development bundle, warnings get wrapped with their condition
* and their condition becomes false to trigger them without evaluating twice.
*
* Input:
*
* ```
* warning(condition, message);
* ```
*
* Output:
*
* ```
* if (__DEV__) {
* warning(condition, message);
* }
* ```
*/
function wrapWarningWithDevCheck(babel) {
const t = babel.types;
const DEV_EXPRESSION = t.identifier('__DEV__');
const SEEN_SYMBOL = Symbol('expression.seen');
const IDENTIFIER_NAME = 'warn';
return {
visitor: {
CallExpression: {
exit(path) {
const node = path.node;
if (node[SEEN_SYMBOL]) {
return;
}
if (path.get('callee').isIdentifier({ name: IDENTIFIER_NAME })) {
node[SEEN_SYMBOL] = true;
path.replaceWith(
t.ifStatement(
DEV_EXPRESSION,
t.blockStatement([t.expressionStatement(node)])
)
);
}
},
},
},
};
}
module.exports = wrapWarningWithDevCheck;
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