Commit graph

67 commits

Author SHA1 Message Date
Steven
83cd45215a
Add warning when image has unused sizes prop (#31064)
- Related to https://twitter.com/jaffathecake/status/1456579637987979265
- Closes #30640
2021-11-08 16:34:30 +00:00
Steven
142af81270
Relax warning for next/image loader width even more (#30624) 2021-10-29 11:54:51 -05:00
Steven
c4ee78f2a7
Relax warning for next/image loader width (#30562)
Some users reported false hits when using complex loaders that implement Art Direction.

We can relax the warnings so that query string params named width should not warn.
2021-10-28 22:32:10 +00:00
Steven
3292713654
Relax warning for next/image parent element (#30453)
This warning was incorrectly displaying for the "background" use case demonstrated here: https://image-component.nextjs.gallery/background
2021-10-27 16:43:02 +00:00
Steven
4782cacecf
Add warning when LCP image is missing priority prop (#30221) 2021-10-25 17:59:00 -04:00
Steven
af5f4a8960
Remove all: initial in favor of specific styles on next/image (#30191)
This reverts some of #30064 which added the `all: initial` style.

That was causing every inline style to be expanded and also prevented `cursor: pointer` from being inherited.

<details>
<summary>View styles</summary>
<p>

```
color: initial; font: initial; font-feature-settings: initial; font-kerning: initial; font-optical-sizing: initial; font-variation-settings: initial; forced-color-adjust: initial; text-orientation: initial; text-rendering: initial; -webkit-font-smoothing: initial; -webkit-locale: initial; -webkit-text-orientation: initial; -webkit-writing-mode: initial; writing-mode: initial; zoom: initial; accent-color: initial; place-content: initial; place-items: initial; place-self: initial; alignment-baseline: initial; animation: initial; appearance: initial; aspect-ratio: initial; backdrop-filter: initial; backface-visibility: initial; background: initial; background-blend-mode: initial; baseline-shift: initial; block-size: initial; border-block: initial; border: initial; border-radius: initial; border-collapse: initial; border-end-end-radius: initial; border-end-start-radius: initial; border-inline: initial; border-start-end-radius: initial; border-start-start-radius: initial; inset: initial; box-shadow: initial; box-sizing: border-box; break-after: initial; break-before: initial; break-inside: initial; buffered-rendering: initial; caption-side: initial; caret-color: initial; clear: initial; clip: initial; clip-path: initial; clip-rule: initial; color-interpolation: initial; color-interpolation-filters: initial; color-rendering: initial; color-scheme: initial; columns: initial; column-fill: initial; gap: initial; column-rule: initial; column-span: initial; contain: initial; contain-intrinsic-size: initial; content: initial; content-visibility: initial; counter-increment: initial; counter-reset: initial; counter-set: initial; cursor: initial; cx: initial; cy: initial; d: initial; display: block; dominant-baseline: initial; empty-cells: initial; fill: initial; fill-opacity: initial; fill-rule: initial; filter: initial; flex: initial; flex-flow: initial; float: initial; flood-color: initial; flood-opacity: initial; grid: initial; grid-area: initial; height: initial; hyphens: initial; image-orientation: initial; image-rendering: initial; inline-size: initial; inset-block: initial; inset-inline: initial; isolation: initial; letter-spacing: initial; lighting-color: initial; line-break: initial; list-style: initial; margin-block: initial; margin: initial; margin-inline: initial; marker: initial; mask: initial; mask-type: initial; max-block-size: initial; max-height: initial; max-inline-size: initial; max-width: 100%; min-block-size: initial; min-height: initial; min-inline-size: initial; min-width: initial; mix-blend-mode: initial; object-fit: initial; object-position: initial; offset: initial; opacity: initial; order: initial; origin-trial-test-property: initial; orphans: initial; outline: initial; outline-offset: initial; overflow-anchor: initial; overflow-clip-margin: initial; overflow-wrap: initial; overflow: initial; overscroll-behavior-block: initial; overscroll-behavior-inline: initial; overscroll-behavior: initial; padding-block: initial; padding: initial; padding-inline: initial; page: initial; page-orientation: initial; paint-order: initial; perspective: initial; perspective-origin: initial; pointer-events: initial; position: initial; quotes: initial; r: initial; resize: initial; ruby-position: initial; rx: initial; ry: initial; scroll-behavior: initial; scroll-margin-block: initial; scroll-margin: initial; scroll-margin-inline: initial; scroll-padding-block: initial; scroll-padding: initial; scroll-padding-inline: initial; scroll-snap-align: initial; scroll-snap-stop: initial; scroll-snap-type: initial; scrollbar-gutter: initial; shape-image-threshold: initial; shape-margin: initial; shape-outside: initial; shape-rendering: initial; size: initial; speak: initial; stop-color: initial; stop-opacity: initial; stroke: initial; stroke-dasharray: initial; stroke-dashoffset: initial; stroke-linecap: initial; stroke-linejoin: initial; stroke-miterlimit: initial; stroke-opacity: initial; stroke-width: initial; tab-size: initial; table-layout: initial; text-align: initial; text-align-last: initial; text-anchor: initial; text-combine-upright: initial; text-decoration: initial; text-decoration-skip-ink: initial; text-indent: initial; text-overflow: initial; text-shadow: initial; text-size-adjust: initial; text-transform: initial; text-underline-offset: initial; text-underline-position: initial; touch-action: initial; transform: initial; transform-box: initial; transform-origin: initial; transform-style: initial; transition: initial; user-select: initial; vector-effect: initial; vertical-align: initial; visibility: initial; -webkit-app-region: initial; border-spacing: initial; -webkit-border-image: initial; -webkit-box-align: initial; -webkit-box-decoration-break: initial; -webkit-box-direction: initial; -webkit-box-flex: initial; -webkit-box-ordinal-group: initial; -webkit-box-orient: initial; -webkit-box-pack: initial; -webkit-box-reflect: initial; -webkit-highlight: initial; -webkit-hyphenate-character: initial; -webkit-line-break: initial; -webkit-line-clamp: initial; -webkit-mask-box-image: initial; -webkit-mask: initial; -webkit-mask-composite: initial; -webkit-perspective-origin-x: initial; -webkit-perspective-origin-y: initial; -webkit-print-color-adjust: initial; -webkit-rtl-ordering: initial; -webkit-ruby-position: initial; -webkit-tap-highlight-color: initial; -webkit-text-combine: initial; -webkit-text-decorations-in-effect: initial; -webkit-text-emphasis: initial; -webkit-text-emphasis-position: initial; -webkit-text-fill-color: initial; -webkit-text-security: initial; -webkit-text-stroke: initial; -webkit-transform-origin-x: initial; -webkit-transform-origin-y: initial; -webkit-transform-origin-z: initial; -webkit-user-drag: initial; -webkit-user-modify: initial; white-space: initial; widows: initial; width: initial; will-change: initial; word-break: initial; word-spacing: initial; x: initial; y: initial; z-index: initial;
```

</p>
</details>

Instead, we will add a few more styles for width/height/opacity to prevent accidentally overriding those.
2021-10-23 02:17:27 +00:00
Tobias Koppers
5c35066820
make static image import output path consistent with other media (#30168)
This will ensure an image hashed consistently regardless of how its imported:

- `import file from "./file.png"` -> /_next/static/media/file.12345678.png
- `url(./file.png)` -> /_next/static/media/file.12345678.png
-  `new URL("./file.png", import.meta.url)` -> /_next/static/media/file.12345678.png
2021-10-22 13:25:54 +00:00
Tobias Koppers
8bce51d8a9
avoid showing empty Import trace for requested module (#30130)
## Bug

- [ ] Related issues linked using `fixes #number`
- [x] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `yarn lint`
2021-10-21 10:07:02 +00:00
Tobias Koppers
b2a9918165
improve production error message printing (#30065)
* improve production error message printing

* update test cases

* add test case

* improve printing of build errors

* improve types

* fix test cases
2021-10-20 18:23:44 -05:00
Steven
c4e26ab248
Prevent inherited styles on next/image wrapper or sizer (#30064)
As a follow up to #30041 which changed `<div>` to `<span>`, this PR makes sure that unexpected styles are not applied to the image wrapper or sizer spans.

For example: `.content span {}` would apply to all spans and incorrectly style the image wrapper.

This PR adds [`all: initial`](https://developer.mozilla.org/en-US/docs/Web/CSS/all) to effectively reset the span styles.
2021-10-19 17:16:17 +00:00
Steven
1a0c1e8a5b
Fix next/image when parent is <p> (#30041)
- Fixes #29717 
- Fixes #21433 
- Closes #21475
2021-10-18 21:29:19 +00:00
Steven
cc1f3b8a38
Add support for AVIF to next/image (#29683)
Add support for AVIF to `next/image`

- Fixes #27882 
- Closes #27432 

## Feature

- [x] Implements an existing feature request
- [x] Related issues linked
- [x] Integration tests added
- [x] Documentation added
- [x] Update manifest output
- [x] Warn when `sharp` is outdated
- [x] Errors & Warnings have helpful link attached
- [ ] Remove `image-size` in favor of `squoosh`/`sharp` (optional, need to benchmark)
2021-10-11 23:17:47 +00:00
Steven
5e29723b05
Bump squoosh to the latest version (#29506)
Bump `squoosh` to the latest version, currently commit [cad09160](cad09160b6).

Ideally, we would use the version published to npm but it hasn't been published in [two months](https://www.npmjs.com/package/@squoosh/lib?activeTab=versions) and we have a patch (#23565) that isn't available upstream.

This also is a precursor to getting support for AVIF.

- Fixes #27092
- Fixes #26527 
- Reapplies the patch from #23565
2021-10-06 14:47:48 +00:00
Steven
2271cd841d
Fix onLoadingComplete() callback when image src is Data URL (#29367)
Fixes #29363 

## Bug

- [x] Related issues linked using `fixes #number`
- [x] Integration tests added
2021-09-26 15:03:07 +00:00
JJ Kasper
a92a5caec2
Update test set-up to leverage playwright when able to (#28634)
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
2021-09-13 14:36:25 +02:00
Steven
d8093ec4b4
Update warning when parent styles break next/image (#28517)
- Follow up to #28221 
- Fixes #27644
2021-08-26 00:09:04 +00:00
Steven
53f0973aba
Fix next/image blur placeholder when JS is disabled (#28269)
This PR does a few things:

- Moves `<noscript>` usage below the blur image since so that the `<noscript>` image renders on top of the blur image
- Remove the `isVisible` check for `<noscript>` since we can't rely on client-side JS
- Add `loading=lazy` to the `<noscript>` image to take advantage of native lazy loading (can't rely on JS lazy loading)

Fixes #28251
2021-08-19 04:26:07 +00:00
Steven
ce187563ef
Add warning when parent styles break next/image (#28221)
Fixes #27644
2021-08-18 02:05:10 +00:00
stefanprobst
daadfd347f
Handle blob urls in image component (#27975)
This PR resurrects #23622 which has not been updated in a while. Makes the `Image` component handle `blob:` object urls.

closes #23622
fixes #19291

credits: @sdn90 

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes
2021-08-13 22:03:20 +00:00
Steven
b05cdb1f64
Add naturalWidth/naturalHeight to onLoadingComplete() callback (#27695)
Resolves #27213
2021-08-02 23:14:38 +00:00
Steven
9065cdf836
Add warning when next/image component has style prop (#27441)
We've never supported the `style` prop as seen in the docs https://nextjs.org/docs/api-reference/next/image#other-props

TS users already get a build error but JS users were left in the dark.

This PR adds a warning so its clear during `next dev`.
2021-07-23 22:53:27 +00:00
Steven
5cd37d9b32
Fix placeholder=blur inside <noscript> (#27311)
We shouldn't be setting `placeholder=blur` styles when JS is disabled because we'll have no way to know when the image is loaded and it will be stuck in blur permanently as mentioned in [this comment](https://github.com/vercel/next.js/pull/19052#issuecomment-882886068).

This PR avoids blur styles on the `<noscript>` version of the image.
2021-07-20 01:23:16 +00:00
Alex Castle
277061943a
Don't emit duplicate image files (#26843)
fixes #26607

This change makes it so the image loader plugin only emits a file while processing an image import for the client. The final generated image URL was already the same in SSR and CSR anyway, so this change doesn't have any functional impact.

I also changed the name of the static page in the image component tests, since it was causing some conflicts with the static assets folder.
2021-07-02 11:27:32 +00:00
Steven
03b61778ba
Fix immutable header for image with static import & unoptimized (#26836)
Fixes #26587
2021-07-01 22:14:42 +00:00
Steven
93f625428b
Add onLoadingComplete() prop to Image component (#26824)
This adds a new prop, `onLoadingComplete()`, to handle the most common use case of `ref`.

I also added docs and a warning when using `ref` so we recommend the new prop instead.
 
- Fixes #18398 
- Fixes #22482
2021-07-01 18:51:20 +00:00
Nils Schönwald
551b6149ce
Fix blurred image position when using objectPosition (#26590)
## Bug

fixes #26309

## Documentation / Examples

see #26309

- [ ] Make sure the linting passes
2021-06-30 21:58:26 +00:00
Taehun Jeong
51022d5819
Fix Show error when user put wrong values in width or height (#26166)
## Bug

- [x] Related issues linked using `fixes #26135 `
- [x] Integration tests added

fixes #26135

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #26135 `
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.

## Documentation / Examples

- [ ] Make sure the linting passes
2021-06-17 20:17:31 +00:00
Steven
d8b59f3e46
Add errors for invalid placeholder=blur usage (#25953)
There are strict conditions for using `placeholder=blur` documented in #25949 but this will give the user a better understanding during `next dev` and links to the error.

- Error when `placeholder=blur` and no `blurDataURL`
- The Error for small images with `placeholder=blur` has been changed to a warning
- Added support for blurring a webp image
- Added error page linking to relevant docs
2021-06-10 18:51:35 +00:00
Steven
79b4cb007b
Add css blur when placeholder=blur (#25945)
* Add css blur when `placeholder=blur`

* Fix tests
2021-06-09 20:28:44 +02:00
Alex Castle
d6105c9502
Add delay to placeholder removal (#25916)
* Add delay to placeholder removal

* Increase jest timeout for image tests

* Use check instead of immediately expecting the result

Co-authored-by: Tim Neutkens <timneutkens@me.com>
2021-06-09 15:35:52 +02:00
Steven
7b77415f3c
Refactor image optimizer static immutable header (#25909)
Previously we were accepting a `s=1` query string parameter for static imports, but this is not necessary.

Instead, this PR looks at the file path to determine if the header should be `immutable`.

The nice thing here is we don't need to worry about someone trying `s=1` with an external image or 3rd party loader. In that case, we use the upstream `Cache-Control` header as usual.

This change also ensures we don't add the `immutable` header for `next dev`.

Related to PR #24993
2021-06-08 22:05:02 +00:00
Alex Castle
ab450aaa1e
Adjust JPEG quality when generating placeholder (#25904)
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
2021-06-08 19:57:24 +02:00
Yamagishi Kazutoshi
0a1d418a96
Do not remove placeholder for data URL (#24704) 2021-06-08 09:03:39 +02:00
Alex Castle
62a4de9f8c
Remove feature flags for static image and blurry placeholder (#25797)
Co-authored-by: Steven <steven@ceriously.com>
Co-authored-by: Tim Neutkens <timneutkens@me.com>
Co-authored-by: Tim Neutkens <tim@timneutkens.nl>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>
2021-06-07 14:43:14 +02:00
Alex Castle
9b295f5a26
Support for static image imports (#24993)
Co-authored-by: Steven <steven@ceriously.com>
Co-authored-by: Tim Neutkens <timneutkens@me.com>
Co-authored-by: Tim Neutkens <tim@timneutkens.nl>
2021-06-04 10:06:00 +02:00
Tim Neutkens
ed3e8f7125
Remove deprecated features (#25446)
* Remove deprecated features

In the next major version we'll want to merge this PR that removes some of the long-time deprecated features, it'll have a positive effect on bundle size.

* Update tests

* Update tests

* Change unsized to layout=fill in test

* Update sizes

* Update rotation test

* Update size limit test

* Update test

* Update test

* Update test
2021-06-02 10:11:03 -05:00
Joon Park
c76170e829
Add experimental blurry placeholder to image component (#24153)
This is the image component implementation of the blurry placeholder as described in #24004. The matching server side implementation is currently planned.

## Feature

- [x] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [x] Related issue #18858 
- [x] Integration tests added

(Documentation and telemetry to follow after server side is implemented)
2021-04-30 17:05:03 +00:00
Joe Haddad
437c35f121
feat: automatically enable webpack 5 (#22323)
Co-authored-by: Tim Neutkens <timneutkens@me.com>
Co-authored-by: Tim Neutkens <tim@timneutkens.nl>
2021-03-24 14:10:10 +01:00
Bruno Crosier
48dd9954d8
Add fallback for <Image /> component when JavaScript is disabled in browser (#19052)
The current `<Image />` component does not fallback gracefully when JavaScript is disabled in the client / browser.

You can test this with the [official Next/Image example](https://csb-4k0kr-p8ya8f304.vercel.app/), by disabling JavaScript in the browser's DevTools. Video demo: https://streamable.com/frkvw9

This PR aims to fix this behaviour by using `<noscript></noscript>` tags to conditionally display a standard `<img>` element using the `props` passed to `<Image />` when JavaScript is disabled.

For browser sessions where JavaScript is enabled, this will not cause an increase in network requests, so there should be no downside.

One area where this PR is a bit "hacky" is that it uses a negative `margin-top` to counteract `sizerStyle.paddingTop`. From what I can tell, `sizerStyle.paddingTop` is generated on the server side, where we can not know ahead of time whether JavaScript is enabled in the browser - hence why I've opted for this solution. 

Fixes #19223
Fixes #21214
2021-03-23 19:25:00 +00:00
Shu Ding
c8680a344f
Remove visibility: hidden from the image component (#23278)
This PR removes the `visibility` style property change from next/image. It was previously added in #18195 to fix a bug that when no `src` is set, and that bug is not valid anymore as all images will always have `src` (and a fallback too).

It also fixes the problem that screen readers ignore elements with `visibility: hidden`.

Fixes #23201.

## Bug

- [x] Related issues #23201
- [ ] Integration tests added

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.

## Documentation / Examples

- [ ] Make sure the linting passes
2021-03-22 19:20:52 +00:00
Alex Castle
a0d44ca311
Allow smaller sizes in srcset for image with fill layout and sizes prop (#21670)
Currently, the image component doesn't handle use of the `sizes` property with `layout="fill"` and `layout="responsive"` very well for small viewports. It will never include sizes smaller than the smallest viewport (640px) in the srcset, so even if you specify `sizes="30vw"` in your image, you have to download the full-viewport-width image on small devices. 

This PR adds logic such that if you use `layout="fill"` and include a `sizes` property, the image component will include the full range of image sizes in the `srcset`.

It also includes an optimization where it finds the smallest `vw` value in the sizes value and combines that with the smallest viewport width, and uses that as the floor of the srcset. It does this so it doesn't unnecessarily increase transfer size by including ALL sizes. This is still a conservative optimization--for 95% of cases, taking the _largest_ `vw` size would work, but I don't see a way to do that without breaking a few corner cases.

The case of a sizes prop with `px` values is fixed but not optimized--though generally that case is less of a good fit for the fill or responsive layout anyway.
2021-02-24 22:57:19 +00:00
JJ Kasper
8bdff57b15
Update redbox tests (#20866)
This adds retrying for getting redbox content and ensures the `next.config.js` file is cleaned up for the dynamic-routing test suite.

x-ref: https://github.com/vercel/next.js/pull/20786#issuecomment-755929891
2021-01-07 18:06:40 +00:00
Joe Haddad
29b591b2bc
fix(next/image): do not pass-through srcSrc on lazy image (#20651)
This PR fixes a bug where we'd accidentally pass-through the user-provided `srcSet` if the image was lazy, just to then replace it when we hydrate.

---

Fixes #19041
2020-12-31 21:08:57 +00:00
Joe Haddad
45b87aa23a
feat(next/image): preload priority images (#20615)
The HTML Living Standard explicitly says `href` should be omitted to prevent the loading of an incorrectly sized image:
https://html.spec.whatwg.org/multipage/semantics.html#attr-link-imagesrcset

![image](https://user-images.githubusercontent.com/616428/103378205-8a013800-4aaf-11eb-9085-10f547263fed.png)

Since it's in the spec, I assume this is valid-enough HTML.

This also dedupes preloads which the old implementation did not.

---

Fixes #18756
x-ref #19118
Fixes #18720
2020-12-30 21:10:28 +00:00
Joe Haddad
d1c565901e
feat(next/image): reduce byte waste for 3x screens (#20610)
https://blog.twitter.com/engineering/en_us/topics/infrastructure/2019/capping-image-fidelity-on-ultra-high-resolution-devices.html

> This means that most OLED screens that say they are 3x resolution, are actually 3x in the green color, but only 1.5x in the red and blue colors. Showing a 3x resolution image in the app vs a 2x resolution image will be visually the same, though the 3x image takes significantly more data. Even true 3x resolution screens are wasteful as the human eye cannot see that level of detail without something like a magnifying glass.

> ![image](https://user-images.githubusercontent.com/616428/103366340-61b61100-4a90-11eb-9c16-8467f8930247.png)

Even the iPhone doesn't have true 3x DPI!

related: #18756
2020-12-30 18:17:46 +00:00
Joe Haddad
e5b2bd1704
fix(next/image): ignore typography prose styles (#20580)
This fixes `next/image` to properly ignore inherited styles applied to the `img` tag by a parent element.

Image styling should **always** be done by a wrapper element—not to the image itself!

---

Fixes #19817
Fixes #19964
2020-12-29 17:34:11 +00:00
Joe Haddad
f02bf210ce
fix(next/image): inherit parent visibility (#20542)
This PR is an alternative to #20247 which contains tests for the expected behavior.

---

Fixes #20198
Closes #20247
2020-12-28 18:55:44 +00:00
Bruno Antunes
8340e6d345
[Image Component] image sizes property becomes 100vw by default (#20067)
Currently if sizes is not defined, Next.js is setting sizes as:
```
(max-width: 640px) 640px, (max-width: 750px) 750px, (max-width: 828px) 828px, (max-width: 1080px) 1080px, (max-width: 1200px) 1200px, (max-width: 1920px) 1920px, (max-width: 2048px) 2048px, 3840px'
```

This pull request will make sizes be `100vw` by default, which will allow us to download "smaller" images than what's currently happening. 

In a demo app I have, the difference is between downloading 488KB vs 1.4MB (in images)
2020-12-10 21:29:37 +00:00
Steven
20ab35128c
Add missing sizes prop on image component (#19128)
- Fixes #19120
- Closes #18413 
- Related to #19041
2020-11-13 04:30:41 +00:00
Joe Haddad
c8fa284854
Control <Image /> prefetching with React (#18904)
This pull request fixes `<Image />` not updating when new props are passed by removing external DOM mutations and relying on React to do it instead.

As an added bonus, I've extracted the intersection observer from both the `<Image />` and `<Link />` component, as their instance can be shared!

The increase in size is minor (+3B), and actually a decrease for apps using both `<Image />` and `<Link />`.

---

Fixes #18698
Fixes #18369
2020-11-06 23:03:15 +00:00