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MIRROR: javascript for 🐜's, a tiny runtime with big ambitions ant.themackabu.dev
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950const assert = require('node:assert');assert.throws(() => { throw new TypeError('test'); }, TypeError);assert.throws(() => { throw new TypeError('test'); }, Error);class CustomError extends Error {}assert.throws(() => { throw new CustomError('test'); }, CustomError);assert.throws(() => assert.throws(() => { throw new RangeError('wrong'); }, TypeError));assert.throws(() => assert.throws(() => { throw new Error('wrong'); }, CustomError));const sentinel = new Error('sentinel');assert.throws(() => { throw sentinel; }, error => error === sentinel);assert.throws(() => { throw sentinel; }, function(error) { 'use strict'; return this !== undefined && error === sentinel; });assert.throws(() => assert.throws(() => { throw sentinel; }, () => false));assert.throws(() => assert.throws(() => { throw sentinel; }, () => { throw sentinel; }), error => error === sentinel);assert.throws(() => assert.throws(() => {}, Error));
const errorDescriptor = Object.getOwnPropertyDescriptor(globalThis, 'Error');let errorReads = 0;function checkMatchingException() { assert.throws(() => { throw 123; }, value => value === 123); assert.throws(() => { throw new CustomError('test'); }, CustomError);}try { globalThis.Error = function ReplacementError() {}; checkMatchingException(); assert.throws( () => assert.throws(() => { throw sentinel; }, CustomError), error => error.message.includes('instance') ); Object.defineProperty(globalThis, 'Error', { configurable: true, get() { errorReads++; throw sentinel; } }); checkMatchingException();} finally { Object.defineProperty(globalThis, 'Error', errorDescriptor);}assert.strictEqual(errorReads, 0);
// a RegExp is tested against String(error), so it sees the name tooassert.throws(() => { throw new TypeError('boom'); }, /^TypeError: boom$/);assert.throws(() => { throw 42; }, /^42$/);assert.throws( () => assert.throws(() => { throw new TypeError('boom'); }, /nope/), error => error.message === "The input did not match the regular expression /nope/. Input:\n\n'TypeError: boom'\n");assert.throws( () => assert.throws(() => { throw new TypeError('boom'); }, /nope/, 'custom'), error => error.message === 'custom');console.log('assert.throws constructors, validation callbacks and regexps ok');