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Support subresource integrity #174

nanaian opened this issue Aug 18, 2019 · 2 comments

Support subresource integrity #174

nanaian opened this issue Aug 18, 2019 · 2 comments


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@nanaian nanaian commented Aug 18, 2019

It would be incredibly useful for import maps to support subresource integrity hashes that are checked against similar to <script integrity=""/>. This is extra important because one of the primary goals of import mapping is to support delivery from 3rd party CDNs (such as unpkg) -- for security, SRI is almost vital when using an external CDN.

This might come in the form:

  "imports": {
    "cool-module": [
      { "url": "", "integrity": "sha384-..." },

Note the new option of a { url, integrity } object in place of a string URL on its own.

Alternatively, a top-level integrity object mapping URL to SRI hash might be a better fit as it is backwards-compatible with existing browser and polyfill implementations, and supports adding SRI for nested imports like cool-module/file.js.


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@domenic domenic commented Aug 18, 2019

Heya, this is out of scope for this repository. See discussion at and the previous similar iissue, #99.

I'll close this since we won't be working on it in this repository, but I'm happy to continue discussing in the close thread.

@domenic domenic closed this Aug 18, 2019

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@shannonmoeller shannonmoeller commented Oct 8, 2019

+1 to the idea of using import maps for subresource integrity as import in JS and @import in CSS have no way to specify a sha. Import maps feel like a natural fit for this. Is there documentation, discussion, or an alternate proposal on the topic elsewhere, if not here or #99?

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