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/**
* Use invariant() to assert state which your program assumes to be true.
*
* Provide sprintf-style format (only %s is supported) and arguments
* to provide information about what broke and what you were
* expecting.
*
* The invariant message will be stripped in production, but the invariant
* will remain to ensure logic does not differ in production.
*/
export function invariant(condition: any, format: string, ...args: any[]) {
if (process.env.NODE_ENV !== 'production') {
if (format === undefined) {
throw new Error('invariant requires an error message argument');
}
}
if (!condition) {
let error;
if (format === undefined) {
error = new Error(
'Minified exception occurred; use the non-minified dev environment ' +
'for the full error message and additional helpful warnings.'
);
} else {
let argIndex = 0;
error = new Error(
format.replace(/%s/g, function() {
return args[argIndex++];
})
);
error.name = 'Invariant Violation';
}
(error as any).framesToPop = 1; // we don't care about invariant's own frame
throw error;
}
}