In TS we can re-export imports using statements of the form:
```
export * from 'some-import';
```
This is downleveled in UMD to:
```
function factory(exports, someImport) {
function __export(m) {
for (var p in m) if (!exports.hasOwnProperty(p)) exports[p] = m[p];
}
__export(someImport);
}
```
This commit adds support for this.
PR Close#34254
In TS we can re-export imports using statements of the form:
```
export * from 'some-import';
```
This can be downleveled in CommonJS to either:
```
__export(require('some-import'));
```
or
```
var someImport = require('some-import');
__export(someImport);
```
Previously we only supported the first downleveled version.
This commit adds support for the second version.
PR Close#34254
Previously individual properties of the src bundle program were
passed to the reflection host constructors. But going forward,
more properties will be required. To prevent the signature getting
continually larger and more unwieldy, this change just passes the
whole src bundle to the constructor, allowing it to extract what it
needs.
PR Close#34254
This commit adds three previously missing validations to
NgModule.declarations:
1. It checks that declared classes are actually within the current
compilation.
2. It checks that declared classes are directives, components, or pipes.
3. It checks that classes are declared in at most one NgModule.
PR Close#34404
A quirk of the Angular template parser is that when parsing templates in the
"default" mode, with options specified by the user, the source mapping
information in the template AST may be inaccurate. As a result, the compiler
parses the template twice: once for "emit" and once to produce an AST with
accurate sourcemaps for diagnostic production.
Previously, only the first parse was performed during analysis. The second
parse occurred during the template type-checking phase, just in time to
produce the template type-checking file.
However, with the reuse of analysis results during incremental builds, it
makes more sense to do the diagnostic parse eagerly during analysis so that
the work isn't unnecessarily repeated in subsequent builds. This commit
refactors the `ComponentDecoratorHandler` to do both parses eagerly, which
actually cleans up some complexity around template parsing as well.
PR Close#34334
During TypeScript module resolution, a lot of filesystem requests are
done. This is quite an expensive operation, so a module resolution cache
can be used to speed up the process significantly.
This commit lets the Ivy compiler perform all module resolution with a
module resolution cache. Note that the module resolution behavior can be
changed with a custom compiler host, in which case that custom host
implementation is responsible for caching. In the case of the Angular
CLI a custom compiler host with proper module resolution caching is
already in place, so the CLI already has this optimization.
PR Close#34332
Previously, the compiler performed an incremental build by analyzing and
resolving all classes in the program (even unchanged ones) and then using
the dependency graph information to determine which .js files were stale and
needed to be re-emitted. This algorithm produced "correct" rebuilds, but the
cost of re-analyzing the entire program turned out to be higher than
anticipated, especially for component-heavy compilations.
To achieve performant rebuilds, it is necessary to reuse previous analysis
results if possible. Doing this safely requires knowing when prior work is
viable and when it is stale and needs to be re-done.
The new algorithm implemented by this commit is such:
1) Each incremental build starts with knowledge of the last known good
dependency graph and analysis results from the last successful build,
plus of course information about the set of files changed.
2) The previous dependency graph's information is used to determine the
set of source files which have "logically" changed. A source file is
considered logically changed if it or any of its dependencies have
physically changed (on disk) since the last successful compilation. Any
logically unchanged dependencies have their dependency information copied
over to the new dependency graph.
3) During the `TraitCompiler`'s loop to consider all source files in the
program, if a source file is logically unchanged then its previous
analyses are "adopted" (and their 'register' steps are run). If the file
is logically changed, then it is re-analyzed as usual.
4) Then, incremental build proceeds as before, with the new dependency graph
being used to determine the set of files which require re-emitting.
This analysis reuse avoids template parsing operations in many circumstances
and significantly reduces the time it takes ngtsc to rebuild a large
application.
Future work will increase performance even more, by tackling a variety of
other opportunities to reuse or avoid work.
PR Close#34288
Previously 'analyze' in the various `DecoratorHandler`s not only extracts
information from the decorators on the classes being analyzed, but also has
several side effects within the compiler:
* it can register metadata about the types involved in global metadata
trackers.
* it can register information about which .ngfactory symbols are actually
needed.
In this commit, these side-effects are moved into a new 'register' phase,
which runs after the 'analyze' step. Currently this is a no-op refactoring
as 'register' is always called directly after 'analyze'. In the future this
opens the door for re-use of prior analysis work (with only 'register' being
called, to apply the above side effects).
Also as part of this refactoring, the reification of NgModule scope
information into the incremental dependency graph is moved to the
`NgtscProgram` instead of the `TraitCompiler` (which now only manages trait
compilation and does not have other side effects).
PR Close#34288
Prior to this commit, the `IvyCompilation` tracked the state of each matched
`DecoratorHandler` on each class in the `ts.Program`, and how they
progressed through the compilation process. This tracking was originally
simple, but had grown more complicated as the compiler evolved. The state of
each specific "target" of compilation was determined by the nullability of
a number of fields on the object which tracked it.
This commit formalizes the process of compilation of each matched handler
into a new "trait" concept. A trait is some aspect of a class which gets
created when a `DecoratorHandler` matches the class. It represents an Ivy
aspect that needs to go through the compilation process.
Traits begin in a "pending" state and undergo transitions as various steps
of compilation take place. The `IvyCompilation` class is renamed to the
`TraitCompiler`, which manages the state of all of the traits in the active
program.
Making the trait concept explicit will support future work to incrementalize
the expensive analysis process of compilation.
PR Close#34288
Previously the UMD rendering formatter assumed that
there would already be import (and an export) arguments
to the UMD factory function.
This commit adds support for this corner case.
Fixes#34138
PR Close#34353
When statically evalulating UMD code it is possible to find
that we are looking for the declaration of an identifier that
actually came from a typings file (rather than a UMD file).
Previously, the UMD reflection host would always try to use
a UMD specific algorithm for finding identifier declarations,
but when the id is actually in a typings file this resulted in the
returned declaration being the containing file of the declaration
rather than the declaration itself.
Now the UMD reflection host will check to see if the file containing
the identifier is a typings file and use the appropriate stategy.
PR Close#34356
The undecorated child migration creates a synthetic decorator, which
contained `"exportAs": ["exportName"]` as obtained from the metadata of
the parent class. This is a problem, as `exportAs` needs to specified
as a comma-separated string instead of an array. This commit fixes the
bug by transforming the array of export names back to a comma-separated
string.
PR Close#34014
When ngcc is analyzing synthetically inserted decorators from a
migration, it is typically not expected that any diagnostics are
produced. In the situation where a diagnostic is produced, however, the
diagnostic would not be reported at all. This commit ensures that
diagnostics in migrations are reported.
PR Close#34014
Previously the `rootDir` was set to the entry-point path but
this is incorrect if the source files are stored in a directory outside
the entry-point path. This is the case in the latest versions of the
Angular CDK.
Instead the `rootDir` should be the containing package path, which is
guaranteed to include all the source for the entry-point.
---
A symptom of this is an error when ngcc is trying to process the source of
an entry-point format after the entry-point's typings have already been
processed by a previous processing run.
During processing the `_toR3Reference()` function gets called which in turn
makes a call to `ReflectionHost.getDtsDeclaration()`. If the typings files
are also being processed this returns the node from the dts typings files.
But if we have already processed the typings files and are now processing
only an entry-point format without typings, the call to
`ReflectionHost.getDtsDeclaration()` returns `null`.
When this value is `null`, a JS `valueRef` is passed through as the DTS
`typeRef` to the `ReferenceEmitter`. In this case, the `ReferenceEmitter`
fails during `emit()` because no `ReferenceEmitStrategy` is able to provide
an emission:
1) The `LocalIdentifierStrategy` is not able help because in this case
`ImportMode` is `ForceNewImport`.
2) The `LogicalProjectStrategy` cannot find the JS file below the `rootDir`.
The second strategy failure is fixed by this PR.
Fixes https://github.com/angular/ngcc-validation/issues/495
PR Close#34212
By ensuring that legacy i18n message ids are rendered into the templates
of components for packages processed by ngcc, we ensure that these packages
can be used in an application that may provide translations in a legacy
format.
Fixes#34056
PR Close#34135
Placing this configuration in to the bundle avoids having to pass the
value around through lots of function calls, but also could enable
support for different behaviour per bundle in the future.
PR Close#34135
For injectables, we currently generate a factory function in the
injectable def (prov) that delegates to the factory function in
the factory def (fac). It looks something like this:
```
factory: function(t) { return Svc.fac(t); }
```
The extra wrapper function is unnecessary since the args for
the factory functions are the same. This commit changes the
compiler to generate this instead:
```
factory: Svc.fac
```
Because we are generating less code for each injectable, we
should see some modest code size savings. AIO's main bundle
is about 1 KB smaller.
PR Close#34076
Previously, the Angular AOT compiler would always add a
`ɵprov` to injectables. But in ngcc this resulted in duplicate `ɵprov`
properties since published libraries already have this property.
Now in ngtsc, trying to add a duplicate `ɵprov` property is an error,
while in ngcc the additional property is silently not added.
// FW-1750
PR Close#34085
In a package.json file, the "typings" or "types" field could be an array
of typings files. ngcc would previously crash unexpectedly for such
packages, as it assumed that the typings field would be a string. This
commit lets ngcc skip over such packages, as having multiple typing
entry-points is not supported for Angular packages so it is safe to
ignore them.
Fixes#33646
PR Close#33973
Recently the ngtsc translator was modified to be more `ScriptTarget`
aware, which basically means that it will not generate non-ES5 code
when the output format is ES5 or similar.
This commit enhances that change by also "downleveling" localized
messages. In ES2015 the messages use tagged template literals, which
are not available in ES5.
PR Close#33857
Due to the fact that Tsickle runs between analyze and transform phases in Angular, Tsickle may transform nodes (add comments with type annotations for Closure) that we captured during the analyze phase. As a result, some patterns where a function is returned from another function may trigger automatic semicolon insertion, which breaks the code (makes functions return `undefined` instead of a function). In order to avoid the problem, this commit updates the code to wrap all functions in some expression ("privders" and "viewProviders") in parentheses. More info can be found in Tsickle source code here: d797426257/src/jsdoc_transformer.ts (L1021)
PR Close#33609
This commit transforms the setClassMetadata calls generated by ngtsc from:
```typescript
/*@__PURE__*/ setClassMetadata(...);
```
to:
```typescript
/*@__PURE__*/ (function() {
setClassMetadata(...);
})();
```
Without the IIFE, terser won't remove these function calls because the
function calls have arguments that themselves are function calls or other
impure expressions. In order to make the whole block be DCE-ed by terser,
we wrap it into IIFE and mark the IIFE as pure.
It should be noted that this change doesn't have any impact on CLI* with
build-optimizer, which removes the whole setClassMetadata block within
the webpack loader, so terser or webpack itself don't get to see it at
all. This is done to prevent cross-chunk retention issues caused by
webpack's internal module registry.
* actually we do expect a short-term size regression while
https://github.com/angular/angular-cli/pull/16228
is merged and released in the next rc of the CLI. But long term this
change does nothing to CLI + build-optimizer configuration and is done
primarly to correct the seemingly correct but non-function PURE annotation
that builds not using build-optimizer could rely on.
PR Close#33337
The ReflectionHost supports enumeration of constructor parameters, and one
piece of information it returns describes the origin of the parameter's
type. Parameter types come in two flavors: local (the type is not imported
from anywhere) or non-local (the type comes via an import).
ngcc incorrectly classified all type parameters as 'local', because in the
source files that ngcc processes the type parameter is a real ts.Identifer.
However, that identifier may still have come from an import and thus might
be non-local.
This commit changes ngcc's ReflectionHost(s) to properly recognize and
report these non-local type references.
Fixes#33677
PR Close#33901
In #32902 a bug was supposedly fixed where internal classes as used
within `ModuleWithProviders` are publicly exported, even when the
typings file already contained the generic type on the
`ModuleWithProviders`. This fix turns out to have been incomplete, as
the `ModuleWithProviders` analysis is not done when not processing the
typings files.
The effect of this bug is that formats that are processed after the
initial format had been processed would not have exports for internal
symbols, resulting in "export '...' was not found in '...'" errors.
This commit fixes the bug by always running the `ModuleWithProviders`
analyzer. An integration test has been added that would fail prior to
this change.
Fixes#33701
PR Close#33875
ngcc has a basic integration test infrastructure that downlevels
TypeScript code into bundle formats that need to be processed by ngcc.
Until now, only ES5 bundles were created with a flat structure, however
more complex scenarios require an APF-like layout containing multiple
bundle formats.
PR Close#33875
Some declaration files may not be referenced from an entry-point's
main typings file, as it may declare types that are only used internally.
ngcc has logic to include declaration files based on all source files,
to ensure internal declaration files are available.
For packages following APF layout, however, this logic was insufficient.
Consider an entry-point with base path of `/esm2015/testing` and typings
residing in `/testing`, the file
`/esm2015/testing/src/nested/internal.js` has its typings file at
`/testing/src/nested/internal.d.ts`. Previously, the declaration was
assumed to be located at `/esm2015/testing/testing/internal.d.ts` (by
means of `/esm2015/testing/src/nested/../../testing/internal.d.ts`)
which is not where the declaration file can be found. This commit
resolves the issue by looking in the correct directory.
PR Close#33875
In flat bundle formats, multiple classes that have the same name can be
suffixed to become unique. In ES5-like bundles this results in the outer
declaration from having a different name from the "implementation"
declaration within the class' IIFE, as the implementation declaration
may not have been suffixed.
As an example, the following code would fail to have a `Directive`
decorator as ngcc would search for `__decorate` calls that refer to
`AliasedDirective$1` by name, whereas the `__decorate` call actually
uses the `AliasedDirective` name.
```javascript
var AliasedDirective$1 = /** @class */ (function () {
function AliasedDirective() {}
AliasedDirective = tslib_1.__decorate([
Directive({ selector: '[someDirective]' }),
], AliasedDirective);
return AliasedDirective;
}());
```
This commit fixes the problem by not relying on comparing names, but
instead finding the declaration and matching it with both the outer
and inner declaration.
PR Close#33878
Previously, ngcc's `Renderer` would add some constants in the processed
files which were emitted as ES2015 code (e.g. `const` declarations).
This would result in invalid ES5 generated code that would break when
run on browsers that do not support the emitted format.
This commit fixes it by adding a `printStatement()` method to
`RenderingFormatter`, which can convert statements to JavaScript code in
a suitable format for the corresponding `RenderingFormatter`.
Additionally, the `translateExpression()` and `translateStatement()`
ngtsc helper methods are augmented to accept an extra hint to know
whether the code needs to be translated to ES5 format or not.
Fixes#32665
PR Close#33514
While processing class metadata, ngtsc generates a `setClassMetadata()`
call which (among other things) contains info about property decorators.
Previously, processing getter/setter pairs with some of ngcc's
`ReflectionHost`s resulted in multiple metadata entries for the same
property, which resulted in duplicate object keys, which in turn causes
an error in ES5 strict mode.
This commit fixes it by ensuring that there are no duplicate property
names in the `setClassMetadata()` calls.
In addition, `generateSetClassMetadataCall()` is updated to treat
`ClassMember#decorators: []` the same as `ClassMember.decorators: null`
(i.e. omitting the `ClassMember` from the generated `setClassMetadata()`
call). Alternatively, ngcc's `ReflectionHost`s could be updated to do
this transformation (`decorators: []` --> `decorators: null`) when
reflecting on class members, but this would require changes in many
places and be less future-proof.
For example, given a class such as:
```ts
class Foo {
@Input() get bar() { return 'bar'; }
set bar(value: any) {}
}
```
...previously the generated `setClassMetadata()` call would look like:
```ts
ɵsetClassMetadata(..., {
bar: [{type: Input}],
bar: [],
});
```
The same class will now result in a call like:
```ts
ɵsetClassMetadata(..., {
bar: [{type: Input}],
});
```
Fixes#30569
PR Close#33514
The reflection hosts have been updated to support the following
code forms, which were found in some minified library code:
* The class IIFE not being wrapped in parentheses.
* Calls to `__decorate()` being combined with the IIFE return statement.
PR Close#33777
Previously we only removed `__decorate()` calls that looked like:
```
SomeClass = __decorate(...);
```
But in some minified scenarios this call gets wrapped up with the
return statement of the IIFE.
```
return SomeClass = __decorate(...);
```
This is now removed also, leaving just the return statement:
```
return SomeClass;
```
PR Close#33777
The `dist/` directory has a duplicate `package.json` pointing to the
same files, which (under certain configurations) can causes ngcc to try
to process the files twice and fail.
This commit adds a default ngcc config for `ng2-dragula` to ignore the
`dist/` entry-point.
Fixes#33718
PR Close#33797
Previously the renderers were fixed so that they inserted extra
"adjacent" statements after the last static property of classes.
In order to help the build-optimizer (in Angular CLI) to be able to
tree-shake classes effectively, these statements should also appear
after any helper calls, such as `__decorate()`.
This commit moves the computation of this positioning into the
`NgccReflectionHost` via the `getEndOfClass()` method, which
returns the last statement that is related to the class.
FW-1668
PR Close#33689
When ngcc is configured to generate reexports for a package using the
`generateDeepReexports` configuration option, it could incorrectly
render the reexports as often as the number of compiled classes in the
declaration file. This would cause compilation errors due to duplicated
declarations.
PR Close#33658
We already have special cases for the `__spread` helper function and with this change we handle the new tslib helper introduced in version 1.10 `__spreadArrays`.
For more context see: https://github.com/microsoft/tslib/releases/tag/1.10.0Fixes: #33614
PR Close#33617
When decorating classes with ivy definitions (e.g. `ɵfac` or `ɵdir`)
the inner name of the class declaration must be used.
This is because in ES5 the definitions are inside the class's IIFE
where the outer declaration has not yet been initialized.
PR Close#33533
In ES5 the class consists of an outer variable declaration that is
initialised by an IIFE. Inside the IIFE the class is implemented by
an inner function declaration that is returned from the IIFE.
This inner declaration may have a different name to the outer
declaration.
This commit overrides `getInternalNameOfClass()` and
`getAdjacentNameOfClass()` in `Esm5ReflectionHost` with methods that
can find the correct inner declaration name identifier.
PR Close#33533
Pete Bacon Darwin
Alex Rickabaugh
George Kalpakas
JoostK
Kara Erickson
Andrew Kushnir
Alan Agius