Assertion Error

Error constructor for test and validation frameworks that implements standardized AssertionError specification.

AssertionError and AssertionResult classes.

build:? downloads:? devDependencies:none

What is AssertionError?

Assertion Error is a module that contains two classes: AssertionError, which is an instance of an Error, and AssertionResult which is not an instance of Error.

These can be useful for returning from a function - if the function "succeeds" return an AssertionResult and if the function fails return (or throw) an AssertionError.

Both AssertionError and AssertionResult implement the Result interface:

interface Result {
  name: "AssertionError" | "AssertionResult";
  ok: boolean;
  toJSON(...args: unknown[]): Record<string, unknown>;

So if a function returns AssertionResult | AssertionError it is easy to check which one is returned by checking either .name or .ok, or check instanceof Error.



assertion-error is available on npm.

$ npm install --save assertion-error


assertion_error is available on

import {
} from "[email protected]/mod.ts";

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