numberkruncher Posts

numberkruncher

•Created by numberkruncher on 6/3/2024 in #help

error: TypeScript files are not supported in npm packages:

I am wondering why I cannot import a .ts file from a node_modules directory. If I could do this then I could use npm as a package manager which would allow me to take advantage of the things that I love about deno as well as being able to work with modules in a familiar way (eg. bundle templates, stylesheets, static assets, whatnot alongside the scripts). eg.

import { foo } from "./node_modules/abc/main.ts";
foo();

import { foo } from "./node_modules/abc/main.ts";
foo();

import { foo } from "@abc/main.ts";
foo();

import { foo } from "@abc/main.ts";
foo();

2 replies

DDeno

•Created by numberkruncher on 5/17/2024 in #help

How to mock modules like you can with jest?

With node/jest I was able to mock specific functions from modules using jest.mock at the start of the test file. How can I do this in Deno? I have a module which calls a function from another module:

import {foo} from "foo";

export function bar(a: number): number {
  return foo(a * 2);
}

import {foo} from "foo";

export function bar(a: number): number {
  return foo(a * 2);
}

How can I substitute foo with a mock/stub/fake for the scope of a test file?

jest.mock("foo", () => ({
  foo: jest.fn();
}));

import {foo} from "foo";

describe("example", () => {
  it("returns the expected number", () => {
    foo.mockImplementation((_) => 100);
    ...

jest.mock("foo", () => ({
  foo: jest.fn();
}));

import {foo} from "foo";

describe("example", () => {
  it("returns the expected number", () => {
    foo.mockImplementation((_) => 100);
    ...

3 replies