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Browserify [does not support](browserify/resolve#224) `"exports"` in a `package.json`, and nor can you use `"browser"` in `package.json` [as a hint to Browserify to look in a certain place for a file](browserify/resolve#250 (comment)). This means the output of `ipjs` is not compatible with Browserify since it expects the runtime/bundler to use the `"exports"` field to look up files paths. If Browserify finds a file path, it will then use the `"browser"` values to apply any overrides, which `ipjs` uses to direct it to the `/cjs` folder. The problem is if it can't find the file in the first place it won't use the `"browser"` map to get the overrides. Handily we're generating the `"browser"` field values from the `"exports"` values so we know we have the complete set of files that the user wants to expose to the outside world, and the paths we want people to use to access them. The change in this PR is to use the `"browser"` field values to [mimc the `"exports"` structure in a CJS-compatible directory structure](browserify/resolve#250 (comment)) as per @ljharb's suggestion. For any file that we are overriding with `"browser"` values, we create an empty file (where a resolvable file does not already exist) a the path Browserify expects it to be at, then it'll dutifully use the `"browser"` field to pull the actual file in.
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I find this somewhat unpalatable, but it does work, so I'll understand if you'd prefer it to be behind a flag. At any rate we should be able to pull it out if browserify/resolve#224 ever lands. |
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Even when that lands, you'd still want this structure present for backwards compatibility with non-ESM node versions. |
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I think we are more ok with dropping support for node versions that are out of LTS than we are dropping support for bundlers. |
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I'm sure; but why bother dropping support for anyone if it's so easy to keep it. |
achingbrain
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Jul 15, 2021
Jest [doesn't support package exports](jestjs/jest#9771), nor does it support `browser` overrides out of the box (though it [can be configured](https://jestjs.io/docs/configuration#resolver-string)). This means it parses the stubbed files introduced in mikeal#13 as javascript, so let's just require and export the file that the stub is stubbing. This has the added bonus of also supporting old nodes that don't understand package exports. Fixes achingbrain/uint8arrays#21
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mikeal
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Jul 15, 2021
Jest [doesn't support package exports](jestjs/jest#9771), nor does it support `browser` overrides out of the box (though it [can be configured](https://jestjs.io/docs/configuration#resolver-string)). This means it parses the stubbed files introduced in #13 as javascript, so let's just require and export the file that the stub is stubbing. This has the added bonus of also supporting old nodes that don't understand package exports. Fixes achingbrain/uint8arrays#21
vasco-santos
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Jul 29, 2021
Jest [doesn't support package exports](jestjs/jest#9771), nor does it support `browser` overrides out of the box (though it [can be configured](https://jestjs.io/docs/configuration#resolver-string)). This means it parses the stubbed files introduced in mikeal#13 as javascript, so let's just require and export the file that the stub is stubbing. This has the added bonus of also supporting old nodes that don't understand package exports. Fixes achingbrain/uint8arrays#21
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Browserify does not support
"exports"in apackage.json, and nor can you use"browser"inpackage.jsonas a hint to Browserify to look in a certain place for a file.This means the output of
ipjsis not compatible with Browserify since it expects the runtime/bundler to use the"exports"field to look up files paths.If Browserify finds a file path, it will then use the
"browser"values to apply any overrides, whichipjsuses to direct it to the/cjsfolder.The problem is if it can't find the file in the first place it won't use the
"browser"map to get the overrides.Handily we're generating the
"browser"field values from the"exports"values so we know we have the complete set of files that the user wants to expose to the outside world, and the paths we want people to use to access them.The change in this PR is to use the
"browser"field values to mimc the"exports"structure in a CJS-compatible directory structure as per @ljharb's suggestion.For any file that we are overriding with
"browser"values, we create an empty file (where a resolvable file does not already exist) a the path Browserify expects it to be at, then it'll dutifully use the"browser"field to pull the actual file in.