Frontend: deprecate extra_html_url

[bramkragten]

Breaking change

We used to allow the user to specify HTML files via extra_html_url that we would import into the page. When it became clear that HTML imports were not going to make it, we replaced that with extra_module_url and extra_js_url_es5 (#24675 by @thomasloven, June 21, 2019).

HTML imports are no longer supported by any browser, and we have to polyfill it to make it work, this is expensive.

extra_html_url is now deprecated and support will be removed in 0.115. You can switch to the new extra_module_url or extra_js_url_es5 by changing your imported file to JavaScript.

Proposed change

home-assistant/frontend#6028

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

# Example configuration.yaml

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request: Deprecate extra_module_url in frontend home-assistant.io#13997

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

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[probot-home-assistant]

Hey there @home-assistant/frontend, mind taking a look at this pull request as its been labeled with an integration (frontend) you are listed as a codeowner for? Thanks!
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[frenck]

You have to wrap it like so:

CONFIG_SCHEMA = vol.Schema(
    {
        DOMAIN: vol.All(
            cv.deprecated(CONF_EXTRA_HTML_URL, invalidation_version="0.115"),
            cv.deprecated(CONF_EXTRA_HTML_URL_ES5, invalidation_version="0.115"),
            vol.Schema(
                {
                    vol.Optional(CONF_FRONTEND_REPO): cv.isdir,
                    vol.Optional(CONF_THEMES): vol.Schema(
                        {cv.string: {cv.string: cv.string}}
                    ),
                    vol.Optional(CONF_EXTRA_HTML_URL): vol.All(cv.ensure_list, [cv.string]),
                    vol.Optional(CONF_EXTRA_MODULE_URL): vol.All(
                        cv.ensure_list, [cv.string]
                    ),
                    vol.Optional(CONF_EXTRA_JS_URL_ES5): vol.All(
                        cv.ensure_list, [cv.string]
                    ),
                    # We no longer use these options.
                    vol.Optional(CONF_EXTRA_HTML_URL_ES5): cv.match_all,
                    vol.Optional(CONF_JS_VERSION): cv.match_all,
                },
            )
        )
    },
    extra=vol.ALLOW_EXTRA,
)