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refactor(compiler): allow disabling external symbol factory reexports (#28594)

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Currently external static symbols which are referenced by AOT
compiler generated code, will be re-exported in the corresponding
`.ngfactory` files.

This way of handling the symbol resolution has been introduced in
favor of avoding dynamically generated module dependencies. This
behavior therefore avoids any strict dependency failures.

Read more about a particular scenario here: https://github.com/angular/angular/issues/25644#issuecomment-458354439

Now with `ngtsc`, this behavior has changed since `ngtsc` just
introduces these module dependencies in order to properly reference
the external symbol from its original location (also eliminating the need
for factories). Similarly we should provide a way to use the same
behavior with `ngc` because the downside of using the re-exported symbol
resolution is that user-code transformations (e.g. the `ngInjectableDef`
metadata which is added to the user source code), can resolve external
symbols to previous factory symbol re-exports. This is a critical issue
because it means that the actual JIT code references factory files in order
to access external symbols. This means that the generated output cannot
shipped to NPM without shipping the referenced factory files.

A specific example has been reported here: https://github.com/angular/angular/issues/25644#issue-353554070

PR Close #28594
This commit is contained in:
Paul Gschwendtner
2019-02-09 19:13:18 +01:00
committed by Miško Hevery
parent 2f73c554c9
commit aa163bea93
4 changed files with 78 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
packages/compiler/test/aot/summary_serializer_spec.ts
View File

@ -466,5 +466,58 @@ import {MockAotSummaryResolverHost, createMockOutputContext} from './summary_res
expect(serialized.json).not.toContain('error');
});
});
describe('createExternalSymbolReexports disabled', () => {
it('should use existing reexports for "importAs" for symbols of libraries', () => {
init();
const externalSerialized = serializeSummaries(
'someFile.ts', createMockOutputContext(), summaryResolver, symbolResolver,
[
{symbol: symbolCache.get('/tmp/external.ts', 'value'), metadata: 'aValue'},
{
symbol: symbolCache.get('/tmp/external.ts', 'reexportValue'),
metadata: symbolCache.get('/tmp/external.ts', 'value')
},
],
[], false);
expect(externalSerialized.exportAs).toEqual([]);
init({
'/tmp/external.ngsummary.json': externalSerialized.json,
});
const serialized = serializeSummaries(
'someFile.ts', createMockOutputContext(), summaryResolver, symbolResolver, [{
symbol: symbolCache.get('/tmp/test.ts', 'mainValue'),
metadata: symbolCache.get('/tmp/external.d.ts', 'reexportValue'),
}],
[]);
expect(serialized.exportAs).toEqual([]);
const importAs =
deserializeSummaries(symbolCache, summaryResolver, 'someFile.d.ts', serialized.json)
.importAs;
expect(importAs).toEqual([{
symbol: symbolCache.get('/tmp/external.d.ts', 'value'),
importAs: symbolCache.get('/tmp/test.d.ts', 'mainValue'),
}]);
});
it('should not create reexports in the ngfactory for external symbols', () => {
init();
const serialized = serializeSummaries(
'someFile.ts', createMockOutputContext(), summaryResolver, symbolResolver, [{
symbol: symbolCache.get('/tmp/test.ts', 'main'),
metadata: [
symbolCache.get('/tmp/external.d.ts', 'lib'),
symbolCache.get('/tmp/external.d.ts', 'lib', ['someMember']),
]
}],
[], false);
expect(serialized.exportAs.length)
.toBe(0, 'Expected no external symbols to be re-exported.');
const deserialized =
deserializeSummaries(symbolCache, summaryResolver, 'someFile.d.ts', serialized.json);
expect(deserialized.importAs.length)
.toBe(0, 'Expected no symbols that can be imported from a re-exported location');
});
});
});
}