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refactor(compiler): add @nocollapse annotation using a synthetic comment (#35932)

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In Ivy, Angular decorators are compiled into static fields that are
inserted into a class declaration in a TypeScript transform. When
targeting Closure compiler such fields need to be annotated with
`@nocollapse` to prevent them from being lifted from a static field into
a variable, as that would prevent the Ivy runtime from being able to
find the compiled definitions.

Previously, there was a bug in TypeScript where synthetic comments added
in a transform would not be emitted at all, so as a workaround a global
regex-replace was done in the emit's `writeFile` callback that would add
the `@nocollapse` annotation to all static Ivy definition fields. This
approach is no longer possible when ngtsc is running as TypeScript
plugin, as a plugin cannot control emit behavior.

The workaround is no longer necessary, as synthetic comments are now
properly emitted, likely as of
https://github.com/microsoft/TypeScript/pull/22141 which has been
released with TypeScript 2.8.

This change is required for running ngtsc as TypeScript plugin in
Bazel's `ts_library` rule, to move away from the custom `ngc_wrapped`
approach.

Resolves FW-1952

PR Close #35932
This commit is contained in:
JoostK
2020-03-07 17:14:25 +01:00
committed by Kara Erickson
parent a5eb0e56b6
commit 75afd80ae8
10 changed files with 65 additions and 136 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
packages/compiler-cli/test/transformers/r3_transform_spec.ts
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@ -40,14 +40,16 @@ describe('r3_transform_spec', () => {
});
it('should be able to modify multiple classes in the same module', () => {
const result = emit(getAngularClassTransformerFactory([{
fileName: someGenFileName,
statements: [
classMethod(new o.ReturnStatement(o.variable('v')), ['v'], 'someMethod', 'SomeClass'),
classMethod(
new o.ReturnStatement(o.variable('v')), ['v'], 'someOtherMethod', 'SomeOtherClass')
]
}]));
const result = emit(getAngularClassTransformerFactory(
[{
fileName: someGenFileName,
statements: [
classMethod(new o.ReturnStatement(o.variable('v')), ['v'], 'someMethod', 'SomeClass'),
classMethod(
new o.ReturnStatement(o.variable('v')), ['v'], 'someOtherMethod', 'SomeOtherClass')
]
}],
false));
expect(result).toContain('static someMethod(v) { return v; }');
expect(result).toContain('static someOtherMethod(v) { return v; }');
});
@ -94,7 +96,7 @@ describe('r3_transform_spec', () => {
fileName: someGenFileName,
statements: [classMethod(stmt, parameters, methodName, className)]
};
return emit(getAngularClassTransformerFactory([module]));
return emit(getAngularClassTransformerFactory([module], false));
}
function emitStaticField(
@ -104,7 +106,7 @@ describe('r3_transform_spec', () => {
fileName: someGenFileName,
statements: [classField(initializer, fieldName, className)]
};
return emit(getAngularClassTransformerFactory([module]));
return emit(getAngularClassTransformerFactory([module], false));
}
});