Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.14.5 to 7.14.6.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.14.6/packages/babel-core)

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Bumps [postcss](https://github.com/postcss/postcss) from 8.3.3 to 8.3.5.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.3.3...8.3.5)

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Bumps [mocha](https://github.com/mochajs/mocha) from 9.0.0 to 9.0.1.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v9.0.0...v9.0.1)

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Bumps [eslint](https://github.com/eslint/eslint) from 7.28.0 to 7.29.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v7.28.0...v7.29.0)

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Bumps [sass](https://github.com/sass/dart-sass) from 1.34.1 to 1.35.1.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/dart-sass/compare/1.34.1...1.35.1)

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Bumps [typescript](https://github.com/Microsoft/TypeScript) from 4.3.2 to 4.3.4.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](https://github.com/Microsoft/TypeScript/compare/v4.3.2...v4.3.4)

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Components that appear in the sidebar are currently responsible for
applying their own bottom-margin to keep things equally spaced.

Margins (spacing) should eventually be applied by the parent element,
but until then, a utility class will ensure that we maintain the same
spacing, as we move to using shared components.

`showdown` does not enable `strikethrough` support by default.

Add associated test and update test module for modern conventions.

Fixes https://github.com/hypothesis/support/issues/141

`ignoreOtherConfiguration` option causes other JSON hypothesis
configurations included in the host page to be disregarded.

In addition, by making `window.hypothesisConfig` non-configurable and
non-writable we make sure that other `window.hypothesisConfig` defined
afterwards can't override it. `via` has the ability to define a
non-configurable `window.hypothesisConfig` before any other.

If `ignoreOtherConfiguration` is used JSON configurations should be
ignored.

Part of https://github.com/hypothesis/viahtml/pull/192

Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.14.4 to 7.14.5.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.14.5/packages/babel-preset-env)

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Bumps [mocha](https://github.com/mochajs/mocha) from 8.4.0 to 9.0.0.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v8.4.0...v9.0.0)

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Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.922.0 to 2.927.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Changelog](https://github.com/aws/aws-sdk-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js/compare/v2.922.0...v2.927.0)

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Bumps [@actions/core](https://github.com/actions/toolkit/tree/HEAD/packages/core) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/actions/toolkit/releases)
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/core/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/core)

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Bumps [@sentry/browser](https://github.com/getsentry/sentry-javascript) from 6.5.1 to 6.7.0.
- [Release notes](https://github.com/getsentry/sentry-javascript/releases)
- [Changelog](https://github.com/getsentry/sentry-javascript/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-javascript/compare/6.5.1...6.7.0)

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Bumps [postcss](https://github.com/postcss/postcss) from 8.3.0 to 8.3.3.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.3.0...8.3.3)

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Bumps [@octokit/rest](https://github.com/octokit/rest.js) from 18.5.6 to 18.6.0.
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](https://github.com/octokit/rest.js/compare/v18.5.6...v18.6.0)

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Bumps [dompurify](https://github.com/cure53/DOMPurify) from 2.2.8 to 2.2.9.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](https://github.com/cure53/DOMPurify/compare/2.2.8...2.2.9)

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Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.14.3 to 7.14.5.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.14.5/packages/babel-core)

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Bumps [y18n](https://github.com/yargs/y18n) from 3.2.1 to 3.2.2.
- [Release notes](https://github.com/yargs/y18n/releases)
- [Changelog](https://github.com/yargs/y18n/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yargs/y18n/commits)

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Bumps [karma](https://github.com/karma-runner/karma) from 6.3.3 to 6.3.4.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma/compare/v6.3.3...v6.3.4)

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The main difference is that configFrom returned config key:value pairs, but now configDefinitions returns key:object pairs. Where the object may hold additional flags and methods for each specific config value. Currently the only method included is valueFn() which gets the value from its source. Others will follow.

Additionally:
- Remove `experimental` from configDefinitions/configFrom as it is not used

Comments without a double `**` are not parsed as JSDoc.

Convert the `initialState` functions in store modules to `const` values
for modules where the state is static (ie. does not depend on
`settings`) and add better type documentation.

Most references to the state are not currently type-checked, but they
will be in future. In the interim this serves as useful documentation
for humans.

`HTMLMetadata` read `document.baseURI` only once in the constructor,
risking issues to the cached value becoming stale. `document.baseURI` is
available in all supported browsers and is easily mocked where needed in
tests, so just always read the current value when needed.

Also remove a `normalizeURI` test seam that was unused. If we did want
to mock this in future we'd use the `$imports` object as we do in other
tests.

Bumps [eslint](https://github.com/eslint/eslint) from 7.27.0 to 7.28.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v7.27.0...v7.28.0)

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Bumps [@sentry/browser](https://github.com/getsentry/sentry-javascript) from 6.5.0 to 6.5.1.
- [Release notes](https://github.com/getsentry/sentry-javascript/releases)
- [Changelog](https://github.com/getsentry/sentry-javascript/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-javascript/compare/6.5.0...6.5.1)

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Rename the `it`/`describe` blocks for tests for the
`getDocumentMetadata` method to make it clearer what APIs the tests
refer to.

This also includes some minor related cleanup:

 - Function expressions => arrow functions
 - Fix a test for Twitter metadata being disabled because it was embedded within another test
 - Remove a duplicated test for the `uri` method

 - Extract `Link` type used in several places and document it as the
   return type of `_getLinks`
 - Document the `metadata` argument to `getLinks` and provide a default
   value for it
 - Add a comment to clarify why `_getLinks` is called in the `uri`
   method

`getDocumentMetadata` returns the first available title from a
prioritized list of sources. Previously the tests only checked the
highest priority source. Update the test so that it covers all cases.

The `HTMLMetadata` class provided two ways to get at the document
metadata:

 1. A `getDocumentMetadata` method which reads the current metadata from
    the document and returns it
 2. A `metadata` field which returns the last-read metadata

The `metadata` field was not used outside the tests and shouldn't be used
because it might return stale metadata (in a web page with client-side
JS that updates `<meta>` and `<link>` tags etc. after the page loads). This field
was also used internally by the various helper methods that gather metadata,
with non-obvious constraints on the order in which the helpers are called.

Remove the field to prevent external mis-use of the class and make the data flow
and dependencies clearer internally.

Bumps [prettier](https://github.com/prettier/prettier) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/2.3.0...2.3.1)

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