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Upgraded es-module-shims to v1.5.5 (#128)
The current version of es-module-shims provided by importmap-rails (v1.4.6) requires allowing `frame-src: blob:` in an app's CSP policy (it creates an iframe with a blob as it's source in order to perform feature detection). This is quite a permissive thing to allow in csp and I wouldn't recommend it if there is an alternative. Since v1.4.7 es-module-shims no longer uses a blob and it will work with `script-src: 'self'` instead. I've upgraded to the latest version, which is v1.5.5. For more details about the CSP issue and it's fix see: * guybedford/es-module-shims#265 * guybedford/es-module-shims#290
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