[Feature]: extensionAlias support
sibelius opened this issue · 5 comments
🚀 Feature Proposal
Similar to webpack/rpsack extensionAlias
https://webpack.js.org/configuration/resolve/#resolveextensionalias
webpack/webpack#13252 (comment)
Be able to resolve import "myFile.js" to myFile.ts, to enable ESM
Motivation
ESM requires file extensions, so we need to import using .js, but this breaks jest that it is looking for .ts file instead
Example
import "myFile.js" to myFile.ts, to enable ESM
Pitch
solve another ESM problem and make module resolution faster
/** @type {import("next").NextConfig} */
const nextConfig = {
experimental: {
// Remove .js from import specifiers, because
// Next.js and webpack do not yet support
// TypeScript-style module resolution out of the box
// https://github.com/webpack/webpack/issues/13252#issuecomment-1171080020
// https://github.com/vercel/next.js/pull/45423
// https://github.com/vercel/next.js/issues/58805
// https://github.com/vercel/next.js/issues/54550
extensionAlias: {
'.js': ['.ts', '.tsx', '.js', '.jsx'],
'.jsx': ['.tsx', '.jsx'],
'.mjs': ['.mts', '.mjs'],
'.cjs': ['.cts', '.cjs'],
},
},
}
Alternative
Hey @sibelius ! 👋 Long time no see, hope everything's good with you.
Considering that part of the TypeScript 5.7+ ecosystem is moving to fully-specified import specifiers with *.ts* extensions (motivated by Node.js type stripping), would allowImportingTsExtensions from TypeScript 5.0 with .ts file extensions work for you?
I wrote a bit in a similar issue over here:
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