@soil/arch/build/es6/arch/src/assert.js

Architectural constructs for web applications.

var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
/**
 * Specialized type of error to easily identify exceptions originated in
 * `assert()` expressions.
 */
var AssertionError = /** @class */ (function (_super) {
    __extends(AssertionError, _super);
    function AssertionError() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    return AssertionError;
}(Error));
/**
 * Ensure that a given condition is true, adding basic support for design-by-
 * contract programming.
 *
 * When providing a function as opposed to a boolean as the first argument, the
 * source code of the function will be included as part of the error message in
 * case of failure, providing immediate feedback to help determine the reason
 * why the assertion did not hold true.
 */
export function assert(assertion, message) {
    if (message === void 0) { message = ''; }
    var assertionIsFunction = typeof assertion === 'function';
    var ok = assertionIsFunction
        ? assertion()
        : assertion;
    if (!ok) {
        if (assertionIsFunction) {
            if (message) {
                message += ' // ';
            }
            message += 'Assertion was: ' + assertion.toString();
        }
        throw new AssertionError(message);
    }
}
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