Commit Graph

113 Commits

Author SHA1 Message Date
lazarljubenovic f4f1bcc997 fix(forms): include null in .parent of abstract control (#32671)
It's perfectly valid for an abstract control not to have a defined parent; yet previously the
types were asserting that AbstractControl#parent is not a null value. This changes correctly
reflects the run-time behavior through the types.

BREAKING CHANGE: Type of AbstractFormControl.parent now includes null

`null` is now included in the types of .parent. If you don't already have a check for this case,
the TypeScript compiler might compain. A v11 migration exists which adds the not-null assertion
operator where necessary.

In an unlikely case your code was testing the parnet against undefined with sitrct equality,
you'll need to change this to `=== null` instead, since the parent is not explicily initialized
with `null` instead of being left `undefined`.

Fixes #16999

PR Close #32671
2020-10-05 09:30:44 -07:00
George Kalpakas bf010b9a07 build(docs-infra): update @angular/material to 10.2.2 (#39017)
This commit updates the version of Angular Components used in angular.io
to version 10.2.2.

NOTE:
The actual size increase for the main bundle in ViewEngine mode is 1.3KB
(because the actual size before this commit was 430423B, not 430008B as
seen in `aio-payloads.json`).

PR Close #39017
2020-09-28 16:28:04 -04:00
George Kalpakas 387fd89b3f build(docs-infra): update @angular/* to 10.1.3 (#39017)
This commit updates the version of Angular framework used in angular.io
to version 10.1.3.

NOTE:
The actual size decrease for the main bundle is 3KB (because the actual
size before this commit was 451226B, not 450952B as seen in
`aio-payloads.json`).

PR Close #39017
2020-09-28 16:28:04 -04:00
Misko Hevery 5db84d7221 refactor(core): Remove `TViewNode` as it is no longer used. (#38707)
Previous commit change the logic to not rely on the `TViewNode` this
change removes it entirely.

PR Close #38707
2020-09-28 16:15:59 -04:00
Misko Hevery eb32b6bd6b refactor(core): Remove reliance on `TNodeType.View`. (#38707)
`TNodeType.View` was created to support inline views. That feature did
not materialize and we have since removed the instructions for it, leave
 an unneeded `TNodeType.View` which was still used in a very
 inconsistent way. This change no longer created `TNodeType.View` (and
 there will be a follow up chang to completely remove it.)

Also simplified the mental model so that `LView[HOST]`/`LView[T_HOST]`
always point to the insertion location of the `LView`.

PR Close #38707
2020-09-28 16:15:59 -04:00
Misko Hevery 812615bb99 refactor(core): Ensure that `previousOrParentTNode` always belongs to current `TView`. (#38707)
`previousOrParentTNode` stores current `TNode`. Due to inconsistent
implementation the value stored would sometimes belong to the current
`TView` and sometimes to the parent. We have extra logic which accounts
for it. A better solution is to just ensure that `previousOrParentTNode`
always belongs to current `TNode`. This simplifies the mental model
and cleans up some code.

PR Close #38707
2020-09-28 16:15:58 -04:00
Andrea Canciani 4744c229db fix(common): correct typing and implementation of `SlicePipe` (#37447)
Even in the overloads, state that it can accept `null` and
`undefined`, in order to ensure easy composition with `async`.

Additionally, change the implementation to return `null` on an
`undefined` input, for consistency with other pipes.

BREAKING CHANGE:
The `slice` pipe now returns `null` for the `undefined` input value,
which is consistent with the behavior of most pipes. If you rely on
`undefined` being the result in that case, you now need to check for it
explicitly.

PR Close #37447
2020-09-28 12:23:33 -04:00
Andrea Canciani 4dfe0fa068 fix(common): correct and simplify typing of `KeyValuePipe` (#37447)
As shown in the tests, `KeyValuePipe.transform` can accept
`undefined`, in which case it always returns `null`.

Additionally, the typing for `string` keys can be made generic, so the
comparison function is only required to accept the relevant cases.

Finally, the typing for `number` records now shows that the comparison
function and the result entries will actually receive the string version
of the numeric keys, just as shown in the tests.

BREAKING CHANGE:
The typing of the `keyvalue` pipe has been fixed to report that for
input objects that have `number` keys, the result will contain the
string representation of the keys. This was already the case and the
code has simply been updated to reflect this. Please update the
consumers of the pipe output if they were relying on the incorrect
types. Note that this does not affect use cases where the input values
are `Map`s, so if you need to preserve `number`s, this is an effective
way.

PR Close #37447
2020-09-28 12:23:33 -04:00
Andrea Canciani 3b919ef10f fix(common): correct and simplify typing of I18nPluralPipe (#37447)
I18nPluralPipe can actually accept `null` and `undefined` (which are
convenient for composing it with the async pipe), but it is currently
typed to only accept `number`.

PR Close #37447
2020-09-28 12:23:32 -04:00
Andrea Canciani 7b2aac97df feat(common): stricter types for number pipes (#37447)
Make typing of number pipes stricter to catch some misuses (such as
passing an Observable or an array) at compile time.

BREAKING CHANGE:
The signatures of the number pipes now explicitly state which types are
accepted. This should only cause issues in corner cases, as any other
values would result in runtime exceptions.

PR Close #37447
2020-09-28 12:23:32 -04:00
Andrea Canciani daf8b7f100 feat(common): stricter types for DatePipe (#37447)
Make typing of DatePipe stricter to catch some misuses (such as passing
an Observable or an array) at compile time.

BREAKING CHANGE:
The signature of the `date` pipe now explicitly states which types are
accepted. This should only cause issues in corner cases, as any other
values would result in runtime exceptions.

PR Close #37447
2020-09-28 12:23:32 -04:00
Andrea Canciani 5f815c0565 fix(common): correct and simplify typing of AsyncPipe (#37447)
`AsyncPipe.transform` will never return `undefined`, even when passed
`undefined` in input, in contrast with what was declared in the
overloads.

Additionally the "actual" method signature can be updated to match the
most generic case, since the implementation does not rely on wrappers
anymore.

BREAKING CHANGE:
The async pipe no longer claims to return `undefined` for an input that
was typed as `undefined`. Note that the code actually returned `null` on
`undefined` inputs. In the unlikely case you were relying on this,
please fix the typing of the consumers of the pipe output.

PR Close #37447
2020-09-28 12:23:32 -04:00
Andrea Canciani c7d5555dfb fix(common): let case conversion pipes accept type unions with `null` (#36259) (#37447)
The old implementation of case conversion types can handle several
values which are not strings, but the signature did not reflect this.

The new one reports errors when falsy non-string inputs are given to
the pipe (such as `false` or `0`) and has a new signature which
instead reflects the behaviour on `null` and `undefined`.

Fixes #36259

BREAKING CHANGE:
The case conversion pipes no longer let falsy values through. They now
map both `null` and `undefined` to `null` and raise an exception on
invalid input (`0`, `false`, `NaN`) just like most "common pipes". If
your code required falsy values to pass through, you need to handle them
explicitly.

PR Close #37447
2020-09-28 12:23:32 -04:00
Andrew Scott e4f4d18e7e refactor(router): Adjust type of parameter in navigateByUrl and createUrlTree to be more accurate (#38227)
`router.navigateByUrl` and `router.createUrlTree` only use a subset of the `NavigationExtras`. This commit
changes the parameter type to use new interfaces that only specify the properties used by
those function implementations. `NavigationExtras` extends both of those interfaces.

Fixes #18798

BREAKING CHANGE: While the new parameter types allow a variable of type
`NavigationExtras` to be passed in, they will not allow object literals,
as they may only specify known properties. They will also not accept
types that do not have properties in common with the ones in the `Pick`.
To fix this error, only specify properties from the `NavigationExtras` which are
actually used in the respective function calls or use a type assertion
on the object or variable: `as NavigationExtras`.

PR Close #38227
2020-09-25 10:36:13 -04:00
klemenoslaj a2068523fd feat(service-worker): add the option to prefer network for navigation requests (#38565)
This commit introduces a new option for the service worker, called
`navigationRequestStrategy`, which adds the possibility to force the service worker
to always create a network request for navigation requests.
This enables the server redirects while retaining the offline behavior.

Fixes #38194

PR Close #38565
2020-09-22 09:29:20 -07:00
Ingo Bürk 2b1b7180db fix(forms): type NG_VALUE_ACCESSOR injection token as array (#29723)
NG_VALUE_ACCESSOR is a multi injection token, users can and
should expect more than one ControlValueAccessor to be
available (and this is how it is used in @angular/forms).

This is now reflected in the definition of the injection token
by typing it as an array of ControlValueAccessor. The motivating
reason is that using the programmatic Injector api will now
type Injector#get correspondingly.

fixes #29351

BREAKING CHANGES

NG_VALUE_ACCESSOR is now typed as a readonly array rather than
a mutable scalar. It is used as a multi injection token and as
such it should always be expected that more than one accessor
may be returned.

PR Close #29723
2020-09-21 12:26:07 -07:00
Andrew Kushnir 95b8a8706a refactor(core): reduce the number of circular deps (#38805)
This commit updates several import statements in the core package to decrease the number of
cycles detected by the dependency checker tool.

PR Close #38805
2020-09-18 11:20:08 -07:00
Ajit Singh dd8d8c8289 fix(common): add `params` and `reportProgress` options to `HttpClient.put()` overload (#37873)
When the response type is JSON, the `put()` overload signature did not have `reportProgress`
and  `params` options. This makes it difficult to type-check this overload.

This commit adds them to the overload signature.

Fixes #23600

PR Close #37873
2020-09-16 15:28:21 -07:00
ajitsinghkaler 5b33798796 feat(docs-infra): created new widget for events page (#36517)
Data in events page was hardcoded and it is manually moved in the table.

Created a new events widget which will automatically move past and upcoming
events from events.json (`aio/content/marketing/events.json`) file to the
relevant table in the events tab

PR Close #36517
2020-09-16 15:14:18 -07:00
Artem Halas 6acea54f62 fix(common): mark locale data arrays as readonly (#30397)
To discourage developers from mutating the arrays returned
from the following methods, their return types have been marked
as readonly.

* `getLocaleDayPeriods()`
* `getLocaleDayNames()`
* `getLocaleMonthNames()`
* `getLocaleEraNames()`

Fixes #27003

BREAKING CHANGE:
The locale data API has been marked as returning readonly arrays, rather
than mutable arrays, since these arrays are shared across calls to the
API. If you were mutating them (e.g. calling `sort()`, `push()`, `splice()`, etc)
then your code will not longer compile. If you need to mutate the array, you
should now take a copy (e.g. by calling `slice()`) and mutate the copy.

PR Close #30397
2020-09-10 15:35:30 -07:00
Sonu Kapoor db21c4fb44 perf(router): use `ngDevMode` to tree-shake error messages in router (#38674)
This commit adds `ngDevMode` guard to throw some errors only in dev mode
The ngDevMode flag helps to tree-shake these error messages from production
builds (in dev mode everything will work as it works right now) to decrease
production bundle size.

PR Close #38674
2020-09-10 09:06:35 -07:00
Yuhei Yasuda c880e393e9 fix(router): If users are using the Alt key when clicking the router links, prioritize browser’s default behavior (#38375)
In most browsers, clicking links with the Alt key has a special behavior, for example, Chrome
downloads the target resource. As with other modifier keys, the router should stop the original
navigation to avoid preventing the browser’s default behavior.

When users click a link while holding the Alt key together, the browsers behave as follows.

Windows 10:

| Browser    | Behavior                                    |
|:-----------|:--------------------------------------------|
| Chrome 84  | Download the target resource                |
| Firefox 79 | Prevent navigation and therefore do nothing |
| Edge 84    | Download the target resource                |
| IE 11      | No impact                                   |

macOS Catalina:

| Browser    | Behavior                                    |
|:-----------|:--------------------------------------------|
| Chrome 84  | Download the target resource                |
| Firefox 79 | Prevent navigation and therefore do nothing |
| Safari 13  | Download the target resource                |

PR Close #38375
2020-09-08 14:07:11 -07:00
Andrew Kushnir bfb7eec698 ci: update payload size limit for integration tests (#38746)
This commit updates (reduces) the payload size limit for a couple test apps. This is a result of
adding the `ngDevMode` to tree-shake more dev-mode-only error messages from the core package within
1150649139.

PR Close #38746
2020-09-08 14:00:09 -07:00
Sonu Kapoor 1150649139 perf(core): use `ngDevMode` to tree-shake error messages (#38612)
This commit adds `ngDevMode` guard to throw some errors only in dev mode
(similar to how things work in other parts of Ivy runtime code). The
`ngDevMode` flag helps to tree-shake these error messages from production
builds (in dev mode everything will work as it works right now) to decrease
production bundle size.

PR Close #38612
2020-09-08 11:41:43 -07:00
Andrew Scott 926ffcd8ac fix(router): support lazy loading for empty path named outlets (#38379)
In general, the router only matches and loads a single Route config tree. However,
named outlets with empty paths are a special case where the router can
and should actually match two different `Route`s and ensure that the
modules are loaded for each match.

This change updates the "ApplyRedirects" stage to ensure that named
outlets with empty paths finish loading their configs before proceeding
to the next stage in the routing pipe. This is necessary because if the
named outlet has `loadChildren` but the associated lazy config is not loaded
before following stages attempt to match and activate relevant `Route`s,
an error will occur.

fixes #12842

PR Close #38379
2020-09-08 10:15:21 -07:00
Alex Rickabaugh 3e97435f1c refactor(compiler-cli): split out template diagnostics package (#38576)
The template type-checking engine includes utilities for creating
`ts.Diagnostic`s for component templates. Previously only the template type-
checker itself created such diagnostics. However, the template parser also
produces errors which should be represented as template diagnostics.

This commit prepares for that conversion by extracting the machinery for
producing template diagnostics into its own sub-package, so that other parts
of the compiler can depend on it without depending on the entire template
type-checker.

PR Close #38576
2020-09-03 14:02:31 -07:00
Joey Perrott fdea1804d6 fix(core): remove CollectionChangeRecord symbol (#38668)
Remove CollectionChangeRecord as it was deprecated for removal in v4, use
IterableChangeRecord instead.

BREAKING CHANGE: CollectionChangeRecord has been removed, use IterableChangeRecord
instead

PR Close #38668
2020-09-02 16:45:19 -07:00
Sonu Kapoor 036a2faf02 feat(service-worker): add `UnrecoverableStateError` (#36847)
In several occasions it has been observed when the browser has evicted
eagerly cached assets from the cache and which can also not be found on the
server anymore. This can lead to broken state where only parts of the application
will load and others will fail.

This commit fixes this issue by checking for the missing asset in the cache
and on the server. If this condition is true, the broken client will be
notified about the current state through the `UnrecoverableStateError`.

Closes #36539

PR Close #36847
2020-08-31 11:41:11 -07:00
Alan Agius 0fc44e0436 feat(compiler-cli): add support for TypeScript 4.0 (#38076)
With this change we add support for TypeScript 4.0

PR Close #38076
2020-08-24 13:06:59 -07:00
Misko Hevery 8f24bc9443 Revert "fix(router): support lazy loading for empty path named outlets (#38379)"
This reverts commit 7ad32649c0.
2020-08-19 21:05:31 -07:00
Andrew Scott 7ad32649c0 fix(router): support lazy loading for empty path named outlets (#38379)
In general, the router only matches and loads a single Route config tree. However,
named outlets with empty paths are a special case where the router can
and should actually match two different `Route`s and ensure that the
modules are loaded for each match.

This change updates the "ApplyRedirects" stage to ensure that named
outlets with empty paths finish loading their configs before proceeding
to the next stage in the routing pipe. This is necessary because if the
named outlet has `loadChildren` but the associated lazy config is not loaded
before following stages attempt to match and activate relevant `Route`s,
an error will occur.

fixes #12842

PR Close #38379
2020-08-19 11:36:06 -07:00
Andrew Scott dbfb50e9f4 fix(router): ensure routerLinkActive updates when associated routerLinks change (#38511)
This commit introduces a new subscription in the `routerLinkActive` directive which triggers an update
when any of its associated routerLinks have changes. `RouterLinkActive` not only needs to know when
links are added or removed, but it also needs to know about if a link it already knows about
changes in some way.

Quick note that `from...mergeAll` is used instead of just a simple
`merge` (or `scheduled...mergeAll`) to avoid introducing new rxjs
operators in order to keep bundle size down.

Fixes #18469

PR Close #38511
2020-08-18 10:21:49 -07:00
Andrew Scott bee44b3359 Revert "fix(router): ensure routerLinkActive updates when associated routerLinks change (#38349)" (#38511)
This reverts commit e0e5c9f195.
Failures in Google tests were detected.

PR Close #38511
2020-08-18 10:21:47 -07:00
Andrew Scott e0e5c9f195 fix(router): ensure routerLinkActive updates when associated routerLinks change (#38349)
This commit introduces a new subscription in the `routerLinkActive` directive which triggers an update
when any of its associated routerLinks have changes. `RouterLinkActive` not only needs to know when
links are added or removed, but it also needs to know about if a link it already knows about
changes in some way.

Quick note that `from...mergeAll` is used instead of just a simple
`merge` (or `scheduled...mergeAll`) to avoid introducing new rxjs
operators in order to keep bundle size down.

Fixes #18469

PR Close #38349
2020-08-17 12:33:59 -07:00
Anas Barghoud ca798804b2 fix(router): export DefaultRouteReuseStrategy to Router public_api (#31575)
export DefaultRouteStrategy class that was used internally and exposed, and add documentation for each one of methods

PR Close #31575
2020-08-13 16:02:41 -07:00
Andrew Kushnir e2e5f83869 ci: update payload size limits for Closure tests (#38411)
Currently the Closure-related tests are not tree-shaking the dev-mode-only content, thus payload
size checks are failing even if dev-mode-only content is added.
The 2e9fdbde9e commit
added some logic to JIT compiler, which is likely triggered the payload size increase. This commit
updates the payload size limits for Closure-related test to get master and patch branches back to
the "green" state.

PR Close #38411
2020-08-11 10:59:39 -07:00
Andrew Scott 71138f6004 feat(compiler-cli): Add compiler option to report errors when assigning to restricted input fields (#38249)
The compiler does not currently report errors when there's an `@Input()`
for a `private`, `protected`, or `readonly` directive/component class member.
This change adds an option to enable reporting errors when a template
attempts to bind to one of these restricted input fields.

PR Close #38249
2020-08-11 09:55:48 -07:00
Misko Hevery 250e299dc3 refactor(core): break `i18n.ts` into smaller files (#38368)
This commit contains no changes to code. It only breaks `i18n.ts` file
into `i18n.ts` + `i18n_apply.ts` + `i18n_parse.ts` +
`i18n_postprocess.ts` for easier maintenance.

PR Close #38368
2020-08-10 15:07:42 -07:00
Misko Hevery 6d8c73a4d6 fix(core): Store the currently selected ICU in `LView` (#38345)
The currently selected ICU was incorrectly being stored it `TNode`
rather than in `LView`.

Remove: `TIcuContainerNode.activeCaseIndex`
Add: `LView[TIcu.currentCaseIndex]`

PR Close #38345
2020-08-10 12:41:17 -07:00
Andrew Kushnir 856db56cca refactor(forms): get rid of duplicate functions (#38371)
This commit performs minor refactoring in Forms package to get rid of duplicate functions.
It looks like the functions were duplicated due to a slightly different type signatures, but
their logic is completely identical. The logic in retained functions remains the same and now
these function also accept a generic type to achieve the same level of type safety.

PR Close #38371
2020-08-07 11:40:04 -07:00
Alessandro 354e66efad refactor(common): use getElementById in ViewportScroller.scrollToAnchor (#30143)
This commit uses getElementById and getElementsByName when an anchor scroll happens,
to avoid escaping the anchor and wrapping the code in a try/catch block.

Related to #28960

PR Close #30143
2020-08-07 11:14:31 -07:00
Misko Hevery 702958e968 refactor(core): add debug ranges to `LViewDebug` with matchers (#38359)
This change provides better typing for the `LView.debug` property which
is intended to be used by humans while debugging the application with
`ngDevMode` turned on.

In addition this chang also adds jasmine matchers for better asserting
that `LView` is in the correct state.

PR Close #38359
2020-08-06 16:58:11 -07:00
Misko Hevery 3821dc5f6c refactor(core): add human readable `debug` for i18n (#38154)
I18n code breaks up internationalization into opCodes which are then stored
in arrays. To make it easier to debug the codebase this PR adds `debug`
property to the arrays which presents the data in human readable format.

PR Close #38154
2020-08-06 15:20:17 -07:00
marcvincenti bb88c9fa3d fix(common): ensure scrollRestoration is writable (#30630)
Some specialised browsers that do not support scroll restoration
(e.g. some web crawlers) do not allow `scrollRestoration` to be
writable.

We already sniff the browser to see if it has the `window.scrollTo`
method, so now we also check whether `window.history.scrollRestoration`
is writable too.

Fixes #30629

PR Close #30630
2020-08-05 16:13:15 -07:00
JiaLiPassion 8fbf40bf40 feat(core): update reference and doc to change `async` to `waitAsync`. (#37583)
The last commit change `async` to `waitForAsync`.
This commit update all usages in the code and also update aio doc.

PR Close #37583
2020-08-03 12:54:13 -07:00
Alex Rickabaugh c573d91285 refactor(compiler-cli): allow program strategies to opt out of inlining (#38105)
The template type-checking engine relies on the abstraction interface
`TypeCheckingProgramStrategy` to create updated `ts.Program`s for
template type-checking. The basic API is that the type-checking engine
requests changes to certain files in the program, and the strategy provides
an updated `ts.Program`.

Typically, such changes are made to 'ngtypecheck' shim files, but certain
conditions can cause template type-checking to require "inline" operations,
which change user .ts files instead. The strategy used by 'ngc' (the
`ReusedProgramStrategy`) supports these kinds of updates, but other clients
such as the language service might not always support modifying user files.

To accommodate this, the `TypeCheckingProgramStrategy` interface was
modified to include a `supportsInlineOperations` flag. If an implementation
specifies `false` for inline support, the template type-checking system will
return diagnostics on components which would otherwise require inline
operations.

Closes #38059

PR Close #38105
2020-07-29 10:31:20 -07:00
Andrea Canciani 9c8bc4a239 fix(common): narrow `NgIf` context variables in template type checker (#36627)
When the `NgIf` directive is used in a template, its context variables
can be used to capture the bound value. This is sometimes used in
complex expressions, where the resulting value is captured in a
context variable. There's two syntax forms available:

1. Binding to `NgIfContext.ngIf` using the `as` syntax:
```html
<span *ngIf="enabled && user as u">{{u.name}}</span>
```

2. Binding to `NgIfContext.$implicit` using the `let` syntax:
```html
<span *ngIf="enabled && user; let u">{{u.name}}</span>
```

Because of the semantics of `ngIf`, it is known that the captured
context variable is truthy, however the template type checker
would not consider them as such and still report errors when
`strict` is enabled.

This commit updates `NgIf`'s context guard to make the types of the
context variables truthy, avoiding the issue.

Based on https://github.com/angular/angular/pull/35125

PR Close #36627
2020-07-29 10:30:44 -07:00
Misko Hevery 2a45b932e2 build: fix broken build (#38274)
```
export const __core_private_testing_placeholder__ = '';
```
This API should be removed. But doing so seems to break `google3` and
so it requires a bit of investigation. A work around is to mark it as
`@codeGenApi` for now and investigate later.

PR Close #38274
2020-07-28 12:30:59 -07:00
Ajit Singh af80bdb470 fix(core): `Attribute` decorator `attributeName` is mandatory (#38131)
`Attribute` decorator has defined `attributeName` as optional but actually its
 mandatory and compiler throws an error if `attributeName` is undefined. Made
`attributeName` mandatory in the `Attribute` decorator to reflect this functionality

Fixes #32658

PR Close #38131
2020-07-28 11:17:24 -07:00
Igor Minar 5d3ba8dec7 test: update ts-api-guardian's strip_export_pattern to exclude Ivy instructions (#38224)
Previously the instructions were included in the golden files to monitor the frequency and rate of
the instruction API changes for the purpose of understanding the stability of this API (as it was
considered for becoming a public API and deployed to npm via generated code).

This experiment has confirmed that the instruction API is not stable enough to be used as public
API. We've since also came up with an alternative plan to compile libraries with the Ivy compiler
for npm deployment and this plan does not rely on making Ivy instructions public.

For these reasons, I'm removing the instructions from the golden files as it's no longer important
to track them.

The are three instructions that are still being included: `ɵɵdefineInjectable`, `ɵɵinject`, and
`ɵɵInjectableDef`.

These instructions are already generated by the VE compiler to support tree-shakable providers, and
code depending on these instructions is already deployed to npm. For this reason we need to treat
them as public api.

This change also reduces the code review overhead, because changes to public api golden files now
require multiple approvals.

PR Close #38224
2020-07-27 14:37:41 -07:00