Before #41162, angular.io was broken on IE 11 due to missing a polyfill
for an API (`Reflect.construct()`) needed by the Custom Elements ES5
shim. #41162 tried to fix this by loading the necessary polyfill
(`es.reflect.construct.js`) on browsers that do not support ES2015
modules (including IE 11).
It turns out that the fix in #41162 was itself broken, because the
`es.reflect.consruct.js` script (included directly in the page via a
`<script>` tag) was in CommonJS format (which cannot run in the browser
as is). By chance, this still allowed browsers that supported neither
Custom Elements nor ES2015 modules (such as IE 11) to work correctly as
a side-effect of loading the `@webcomponents/custom-elements` polyfill
after the Custom Elements ES5 shim (`native-shim.js`). However, on the
few browsers that natively support Custom Elements but not ES2015
modules, angular.io would still be broken.
This commit correctly fixes angular.io on all browsers by properly
bundling the polyfills and transpiling to ES5.
Implementation-wise, we use [esbuild][1] for bundling the polyfills (and
converting from CommonJS to a browser-compatible, IIFE-based format) and
[swc][2] for downleveling the code to ES5 (since `esbuild` only supports
ES2015+).
[1]: https://esbuild.github.io/
[2]: https://swc.rs/
PR Close#41183
Previously, the angular.io app was broken on IE 11. In particular, pages
that included Custom Elements would fail to load, because the
`Reflect.construct()` method (which the Custom Elements ES5 shim relies
on) was not available.
This commit fixes this by loading the polyfill for `Reflect.construct()`
on browsers that do not support ES2015 (including IE 11).
PR Close#41162
The custom elements spec is not compatible with ES5 style classes. This
means ES2015 code compiled to ES5 will not work with a native
implementation of Custom Elements. To support browsers that natively
support Custom Elements but not ES2015 modules, we load
`@webcomponents/custom-elements/src/native-shim.js`, which minimally
augments the native implementation to be compatible with ES5 code.
(See [here][1] for more details.)
Previously, the shim was included in `polyfills.ts`, which meant it was
loaded in all browsers (even those supporting ES2015 modules and thus
not needing the shim).
This commit moves the shim from `polyfills.ts` to a `nomodule` script
tag in `index.html`. This will ensure that it is only loaded in browsers
that do not support ES2015 modules and thus do not needed the shim.
NOTE:
This commit also reduces size of the polyfills bundle by ~400B
(52609B --> 52215B).
[1]: https://www.npmjs.com/package/@webcomponents/custom-elements#es5-vs-es2015
PR Close#41162
The Displaying Data in Views topic is actually a small tutorial
that describes Angular features such as interpolation and
structural directives. These content is already covered in
our getting started tutorial and in Tour of Heroes.
This change adds redirects to the Template Syntax section
of the Getting Started tutorial and deletes displaying-data.md.
PR Close#38885
With this change we add a short url to strict mode guide
(angular.io/strict -> angular.io/guide/strict-mode). This is important because
of two reasons.
1) Reduce the clutter in the terminal when we include the strict mode guide url in a prompt.
2) Easiler to share in conferences, slides etc..
PR Close#39129
With this change we add redirects for config files generated by the Angular CLI. These links form part of a comment in the generated files, thus it is important that they valid for the many years to come.
PR Close#37533
This commit adds an exception for "guide/bazel" to the navigationUrls in
the Service Worker config. This is needed for redirection to work.
PR Close#37190
This commit also changes the config files and their layout to
(reasonably closely) match what the cli would generate for a new app.
Related Jira issue: [TOOL-815](https://angular-team.atlassian.net/browse/TOOL-815)
PR Close#29926
Due to unknown reasons, Firebase seems to return a 301 response for
`/index.html`, but without a `Location` header. According to the spec,
the browser will not follow the redirect, considering the response as
failed, instead.
This commit temporarily removes `index.html` from hashed resources and
changes `index` to `/` in `ngsw-config.json`, until we figure out an
appropriate long-term solution.
PR Close#25692
This allows URLs to be passed through to the server (where they are
properly redirected), instead of serving `index.html` from the SW.
Known issue:
`/docs/` will be passed through to the server. `/docs` (without the
trailing slash) will be correctly treated as a navigation URL and
handled by the SW.
We don't link to `/docs/` from within the app, but if there are external
links to `/docs/` they will require a round-trip to the server and will
not work in offline mode.
PR Close#19795
George Kalpakas
Kapunahele Wong
David Shevitz
Alan Agius
Keen Yee Liau
Judy Bogart
jenniferfell
Vani
Filipe Silva
