@planet-a/affinity-node
Version:
API wrapper for the affinity.co API
53 lines (52 loc) • 1.72 kB
JavaScript
// Copyright 2018-2025 the Deno authors. MIT license.
// This module is browser compatible.
import { AssertionError } from "./assertion_error.js";
/**
* Make an assertion that `obj` is an instance of `type`.
* If not then throw.
*
* @example Usage
* ```ts ignore
* import { assertInstanceOf } from "@std/assert";
*
* assertInstanceOf(new Date(), Date); // Doesn't throw
* assertInstanceOf(new Date(), Number); // Throws
* ```
*
* @typeParam T The expected type of the object.
* @param actual The object to check.
* @param expectedType The expected class constructor.
* @param msg The optional message to display if the assertion fails.
*/
export function assertInstanceOf(actual, expectedType, msg = "") {
if (actual instanceof expectedType)
return;
const msgSuffix = msg ? `: ${msg}` : ".";
const expectedTypeStr = expectedType.name;
let actualTypeStr = "";
if (actual === null) {
actualTypeStr = "null";
}
else if (actual === undefined) {
actualTypeStr = "undefined";
}
else if (typeof actual === "object") {
actualTypeStr = actual.constructor?.name ?? "Object";
}
else {
actualTypeStr = typeof actual;
}
if (expectedTypeStr === actualTypeStr) {
msg =
`Expected object to be an instance of "${expectedTypeStr}"${msgSuffix}`;
}
else if (actualTypeStr === "function") {
msg =
`Expected object to be an instance of "${expectedTypeStr}" but was not an instanced object${msgSuffix}`;
}
else {
msg =
`Expected object to be an instance of "${expectedTypeStr}" but was "${actualTypeStr}"${msgSuffix}`;
}
throw new AssertionError(msg);
}