ERR_REQUIRE_ESM when importing openApiTS function

[RomainGuarinoni]

When I use the version 5.2.0 of openapi-typescript, there is this error when i try to import the openApiTS function :

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: /home/rguarinoni/Documents/findAMusician/findAMusicianBackend/node_modules/openapi-typescript/dist/index.js
require() of ES modules is not supported.
require() of /home/rguarinoni/Documents/findAMusician/findAMusicianBackend/node_modules/openapi-typescript/dist/index.js from /home/rguarinoni/Documents/findAMusician/findAMusicianBackend/api/command/generateType.ts is an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
Instead rename index.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from /home/rguarinoni/Documents/findAMusician/findAMusicianBackend/node_modules/openapi-typescript/package.json.

    at new NodeError (node:internal/errors:363:5)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1126:13)
    at Module.load (node:internal/modules/cjs/loader:989:32)
    at Function.Module._load (node:internal/modules/cjs/loader:829:14)
    at Module.require (node:internal/modules/cjs/loader:1013:19)
    at require (node:internal/modules/cjs/helpers:93:18)
    at Object.<anonymous> (/home/rguarinoni/Documents/findAMusician/findAMusicianBackend/api/command/generateType.ts:4:1)
    at Module._compile (node:internal/modules/cjs/loader:1109:14)
    at Module.m._compile (/home/rguarinoni/Documents/findAMusician/findAMusicianBackend/node_modules/ts-node/src/index.ts:1371:23)
    at Module._extensions..js (node:internal/modules/cjs/loader:1138:10) {
  code: 'ERR_REQUIRE_ESM'
}

I found a way to fix the issue by downgrading to 4.4.0. Additionnaly, i noticed that a big difference was the presence of the dependecy kleur in the package.json which i suspect can be the cause of the issue.

[drwpow]

Version 5.x is a breaking change from 4.x where ESM is now required. Are you trying to require() this library in Node?

[RomainGuarinoni]

No I was trying to import the openApiTS function as an ESM like below :

import openApiTS from 'openapi-typescript';

And this error appeared. It's strange ...

[drwpow]

I’m going to close in favor of #888. If you could document your build tooling, and how you’re compiling TypeScript (e.g. what is your target in tsconfig.json? are you using ts-node? etc.), I’d love additions to the README on using the new ESM version with specific build tooling.