Error "Trailing "/" installs not supported installing" when installing react-intl using esm.sh provider

[MilanKovacic]

Reproduction steps:

1. Run jspm install react-intl --provider esm.sh
2. The following importmap.json is generated:

{
  "env": [
    "browser",
    "development",
    "module"
  ],
  "imports": {
    "react-intl": "https://esm.sh/*react-intl@6.4.4/lib/index.js"
  },
  "scopes": {
    "https://esm.sh/": {
      "@formatjs/ecma402-abstract": "https://esm.sh/*@formatjs/ecma402-abstract@1.17.0/lib/index.js",
      "@formatjs/fast-memoize": "https://esm.sh/*@formatjs/fast-memoize@2.2.0/lib/index.js",
      "@formatjs/icu-messageformat-parser": "https://esm.sh/*@formatjs/icu-messageformat-parser@2.6.0/lib/index.js",
      "@formatjs/icu-skeleton-parser": "https://esm.sh/*@formatjs/icu-skeleton-parser@1.6.0/lib/index.js",
      "@formatjs/intl": "https://esm.sh/*@formatjs/intl@2.9.0/lib/index.js",
      "@formatjs/intl-localematcher": "https://esm.sh/*@formatjs/intl-localematcher@0.4.0/lib/index.js",
      "hoist-non-react-statics": "https://esm.sh/*hoist-non-react-statics@3.3.2/dist/hoist-non-react-statics.cjs.js/index.js",
      "intl-messageformat": "https://esm.sh/*intl-messageformat@10.5.0/lib/index.js",
      "react": "https://esm.sh/*react@18.2.0",
      "react-is": "https://esm.sh/*react-is@16.13.1/index.js",
      "tslib": "https://esm.sh/*tslib@2.6.1"
    }
  }
}

3. Re-run jspm install react-intl --provider esm.sh
4. The following error is generated:
   Error: Trailing "/" installs not supported installing https://esm.sh/*tslib@2.6.1/ for https://esm.sh/v130/react-intl@6.4.4/X-ZS8q/esnext/lib.js

[guybedford]

Thanks for posting, The problem here is that JSPM is seeing the "tslib": "https://esm.sh/*tslib@2.6.1" mapping for tslib as mapping into the package boundary, since it isn't a full resolved module path to a .js file. JSPM always tracks the package boundary point to manage exports fields mappings, so in this case it's seeing the mapping as being the package boundary itself using that locked mapping during regeneration, and then not supporting it.

The original concept behind trailing "/" installs was being able to do something like jspm install pkg/ and install all exports of the package at once something like a wildcard. But in this position that error certainly makes no sense at all.

Will work on a fix in the generator now.

[guybedford]

jspm/generator#316 should fix this - as soon as that's passing CI we'll roll out a release cycle this week.