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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;
  }
}