Use target rather than expression type as narrowing base case #15398
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jeskew
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Oct 27, 2024
Resolves #15397 Worked on this as an alternative way to address #15114 (instead of #15398). This PR does two things: 1. If a ternary has a literally-typed condition (i.e., it is definitely true or definitely false), the type engine will use the type of the active branch's expression. E.g., the type of `true ? 'a' : 'b'` is `'a'`, and the type of `false ? 'a' : 'b'` is `'b'`. There was a TODO comment in TypeAssignmentVisitor suggesting this change. 2. If the types of both branches can be combined instead of represented as a union, the type engine will do so. For example, the type of `unknownCondition ? 'a' : 'b'` is `'a' | 'b'` (a union), but the type of `unknownCondition ? [stringParam] : [intParam]` is `[int | string]` (assuming the type of `stringParam` is `string` and the type of `intParam` is `int`). This change relies on existing type collapsing logic, so it will handle things like combining refinements on string types and combining objects into tagged unions if possible. One change I made to the TypeCollapser is to collapse objects that *can't* be combined into a tagged union into an object whose properties are a union of the possible property types of the inputs. This is similar to how we collapse tuple types. Given a template like the following: ```bicep param a { foo: string } param b { bar: string *: int } param condition bool var value = condition ? a : b ``` `value` would have a type of `{ bar: string, foo: int | string, *: int }`, with all properties flagged as optional. ###### Microsoft Reviewers: [Open in CodeFlow](https://microsoft.github.io/open-pr/?codeflow=https://github.com/Azure/bicep/pull/15399)
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Resolves #15114
Microsoft Reviewers: Open in CodeFlow