Function assert

tfjs-vis/src/util/utils.ts:23–27

(expr: boolean, msg: string|(() => string))

 * Tests a boolean expression and throws a message if false.
 */
export function assert(expr: boolean, msg: string|(() => string)) {
  if (!expr) {
    throw new Error(typeof msg === 'string' ? msg : msg());
  }
}

export function assertShapesMatch(
    shapeA: number[], shapeB: number[], errorMessagePrefix = ''): void {