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The only workaround to have an isomorphic __dirname or __filename to be used for both "cjs" and "esm" without using build-time tools like @rollup/plugin-replace or esbuild "define" would be using a library like filedirname that does a trick inspecting error stacks, it's clearly not the cleanest solution.
Until this issue TypeScript#33069 is closed, TypeScript doesn't have complete support for it, fortunately, there are 2 workarounds:
In The Guild we use this method using tooling that creates the temporary package.json automatically. See bob-the-bundler & bob-esbuild
In The Guild we use this method using tooling that creates the temporary package.json automatically. See bob-the-bundler & bob-esbuild
The best solution for this is to have ESM examples in a monorepo testing firsthand if everything with the logic included doesn't break, using tools that output both CommonJS & ESM like tsup might become very handy, but that might not be straightforward, especially for big projects.
There are workarounds, but nothing actually works in 100% of the possible use-cases (see for example, ts-jest issue), and for that reason, we recommend tooling that enables this type of building without needing any workaround, usually using Rollup and/or esbuild.
In The Guild we use this method using tooling that creates the temporary package.json automatically. See bob-the-bundler & bob-esbuild
There are workarounds, but nothing actually works in 100% of the possible use-cases (see for example, ts-jest issue), and for that reason, we recommend tooling that enables this type of building without needing any workaround, usually using Rollup and/or esbuild.
There are workarounds, but nothing actually works in 100% of the possible use-cases (see for example, ts-jest issue), and for that reason, we recommend tooling that enables this type of building without needing any workaround, usually using Rollup and/or esbuild.