Typescript : require statement not part of an import statement – Typescript

The Problem:

"In a TypeScript project, when using the ‘require’ statement to import a module, TSLint is raising a warning indicating that the ‘require’ statement is not part of an import statement. Furthermore, changing the statement to ‘import users = <IUser[]>’ require(path.join(process.cwd() + "/data"))’ results in a TS1003 error indicating that an identifier is expected. The goal is to find a valid way to import the module using the ‘require’ statement while adhering to TypeScript’s syntax and best practices."
}

The Solutions:

Solution 1: Use A Static Path To The Module

Typography modules are an implementation of ES6 modules, and ES6 modules are static. The warning from TSLint arises from the dynamic path path.join(process.cwd() + "/data"), which hinders the compiler from determining the module at compile time and leads to any. To resolve this issue, use a static path to the module, allowing TypeScript to resolve it at compile time and assign the correct exported type (IUser[]) to users.

import users = require("./yourModuleThatExportsUsers");

If your data module contains only data, consider converting it to a JSON file for loading (Node.js) or bundling (Webpack).

Solution 2: Use Dynamic Import

Since May 2019, you can utilize dynamic import, which accepts both static and dynamic paths. This approach requires using the await keyword:

const users = await import("./yourModuleThatExportsUsers");

Refer to the TypeScript 2.4 Release Notes for more information.

Solution 2: Disable ESLint Rule

If your code runs correctly but ESLint reports an error, you can suppress the error by adding /* eslint-disable */ above the line of code that triggers the error.

For example, if you modify your code as follows, the ESLint error should disappear:

“`ts
/* eslint-disable */
const path = require(“path”);
module.exports = {
lintOnSave: false,
chainWebpack: config => {

    const dir = path.resolve(__dirname, "src/assets/icons");

    config.module
        .rule("svg-sprite")
        .test(/\.svg$/)
        .include.add(dir).end() // 包含 icons 目录
        .use("svg-sprite-loader").loader("svg-sprite-loader").options({extract: false}).end();
    /* eslint-disable */
    config.plugin("svg-sprite").use(require("svg-sprite-loader/plugin"), [{plainSprite: true}] || []);
    config.module.rule("svg").exclude.add(dir); // 其他 svg loader 排除 icons 目录
}

};

Solution 3: Use Dynamic Module Loading

To resolve the error “require statement not part of an import statement” and use the require() function in TypeScript, you can employ dynamic module loading. This approach involves importing the necessary type definitions and then dynamically loading the module using the require() function. Here’s an example:

import { IUser } from './lib/user'; // Import the type definition for IUser

const users: IUser[] = require(path.join(process.cwd() + "/data")); // Dynamically load the module using require()

In this example, we first import the IUser type definition from the ./lib/user module. This allows us to specify the type of the users variable. Next, we use the require() function to dynamically load the module located at path.join(process.cwd() + "/data"). The result of this operation is assigned to the users variable, which is typed as an array of IUser objects.

By utilizing dynamic module loading, you can dynamically load modules based on certain conditions or user input, providing greater flexibility in your application’s architecture.

Solution 4: Using ProvidePlugin

To resolve the error "require statement not part of an import statement" and the subsequent error "TS1003 Identifier expected," you can use the ProvidePlugin in your webpack configuration:

module.exports = {
  // Your existing webpack configuration
  chainWebpack: (config) => {
    config.plugin('provide').use(
      require('webpack').ProvidePlugin,
      [
        // List the modules you want to provide
        {
          $: 'jquery',
        },
        // Add additional modules as needed
      ]
    );
  },
};

Here’s how this solution works:

1. ProvidePlugin: This plugin allows you to provide global variables that can be accessed throughout your application without explicitly importing them in each module.

2. config.plugin(‘provide’).use(): This line adds the ProvidePlugin to your webpack configuration.

3. require(‘webpack’).ProvidePlugin: This imports the ProvidePlugin from the webpack package.

4. **[ { \(: ‘jquery’ }, … ]**: Within the plugin configuration, you specify the modules you want to provide. In this example, we are providing jQuery by mapping the `\)global variable to thejquery` module. You can add more modules as needed.

By using the ProvidePlugin, you can define global variables that can be used throughout your application without having to import them explicitly. This can be useful for providing commonly used libraries like jQuery or Lodash without having to import them in every module.