ESM not working as expected

[seancdavis]

Tried to upgrade to v3 in a project that is using TypeScript to import this file and I'm seeing the following error:

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: .../node_modules/markdown-table/index.js
require() of ES modules is not supported.

I played around with renaming the main file with .cjs and .mjs and ran into other issues.

Running Node v15.11.0

[wooorm]

Heya. You’re the first to be hit by this. Expect more to come over the following months tho.

TL:DR; don’t update to ESM yet if you don’t want to. But it’s time to start thinking about moving to actual ESM instead of faux-ESM/CJS.

Related:

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
• https://nodejs.org/api/esm.html
• https://twitter.com/sindresorhus/status/1349294527350149121
• https://twitter.com/kentcdodds/status/1369803853005209602
• Next major for the ecosystem unifiedjs/unified#121

[fantapop]

Is the crux of the issue here that markdown-table is esm only and the typescript project is compiling down to commonjs before executing?

[wooorm]

See https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c for more info about how to use TS with ESM.