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Showing content from https://rustwasm.github.io/docs/wasm-pack/prerequisites/considerations.html below:

considerations - Hello wasm-pack!

1. 1. Introduction
2. 2. Quickstart
3. 3. Prerequisites
4. 1. 3.1. npm (optional)
   2. 3.2. considerations
   3. 3.3. Non-rustup setups
5. 4. Commands
6. 1. 4.1. new
   2. 4.2. build
   3. 4.3. test
   4. 4.4. pack and publish
   5. 4.5. init (DEPRECATED)
7. 5. Tutorials
8. 1. 5.1. Hybrid applications with Webpack
   2. 1. 5.1.1. Getting started
      2. 5.1.2. Using your library
   3. 5.2. npm browser packages
   4. 1. 5.2.1. Getting started
      2. 1. 5.2.1.1. Manual Setup
      3. 5.2.2. Template deep dive
      4. 1. 5.2.2.1. Cargo.toml
         2. 5.2.2.2. src/lib.rs
         3. 5.2.2.3. src/utils.rs
         4. 5.2.2.4. wee_alloc
         5. 5.2.2.5. tests/web.rs
      5. 5.2.3. Building your project
      6. 5.2.4. Testing your project
      7. 5.2.5. Packaging and publishing
      8. 5.2.6. Using your library
9. 6. Cargo.toml Configuration
10. 7. Contributing

Currently, wasm-pack generated npm modules require us to you have fetch polyfill in your node project.

If there is a module from wasm-pack build --target nodejs you may encounter some errors regarding global Headers, Request, Response and fetch Web APIs.

ReqwestError(reqwest::Error { kind: Builder, source: "JsValue(ReferenceError: Headers is not defined
ReqwestError(reqwest::Error { kind: Builder, source: "JsValue(ReferenceError: Request is not defined

    var ret = getObject(arg0) instanceof Response;
ReferenceError: Response is not defined

Import or declare fetch and objects: Headers, Request, Response

// CommonJS
const fetch = require('node-fetch');

// ES Module
import fetch from 'node-fetch';

// @ts-ignore
global.fetch = fetch;
// @ts-ignore
global.Headers = fetch.Headers;
// @ts-ignore
global.Request = fetch.Request;
// @ts-ignore
global.Response = fetch.Response;

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