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fix(compiler-cli): don't lower expressions in flat module metadata (#23226)

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Lowering expressions in flat module metadata is desirable, but it won't
work without some rearchitecting. Currently the flat module index source
is added to the Program and therefore must be determined before the rest
of the transforms run. Since the lowering transform changes the set of
exports needed in the index, this creates a catch-22 in the index
generation.

This commit causes the flat module index metadata to be generated using
only those transforms which are "safe" (don't modify the index).

PR Close #23226
This commit is contained in:
Alex Rickabaugh
2018-04-06 08:23:40 -07:00
committed by Igor Minar
parent 195193b9be
commit 11ea3a3f33
2 changed files with 19 additions and 8 deletions
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5
packages/compiler-cli/test/ngc_spec.ts
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@ -1040,7 +1040,6 @@ describe('ngc transformer command-line', () => {
exports: [
FlatComponent,
],
providers: [{provide: 'test', useFactory: () => true}],
})
export class FlatModule {
}`);
@ -1055,7 +1054,7 @@ describe('ngc transformer command-line', () => {
shouldExist('index.metadata.json');
});
it('should downlevel flat module metadata', () => {
it('should downlevel templates in flat module metadata', () => {
writeFlatModule('index.js');
const exitCode = main(['-p', path.join(basePath, 'tsconfig.json')], errorSpy);
@ -1066,7 +1065,7 @@ describe('ngc transformer command-line', () => {
const metadataPath = path.resolve(outDir, 'index.metadata.json');
const metadataSource = fs.readFileSync(metadataPath, 'utf8');
expect(metadataSource).not.toContain('templateUrl');
expect(metadataSource).toContain('"useFactory":{"__symbolic":"reference","name":"ɵ0"}');
expect(metadataSource).toContain('<div>flat module component</div>');
});
describe('with tree example', () => {