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fix(ivy): add strictLiteralTypes to align Ivy + VE checking of literals (#35462)

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Under View Engine's default (non-fullTemplateTypeCheck) checking, object and
array literals which appear in templates are treated as having type `any`.
This allows a number of patterns which would not otherwise compile, such as
indexing an object literal by a string:

```html
{{ {'a': 1, 'b': 2}[value] }}
```

(where `value` is `string`)

Ivy, meanwhile, has always inferred strong types for object literals, even
in its compatibility mode. This commit fixes the bug, and adds the
`strictLiteralTypes` flag to specifically control this inference. When the
flag is `false` (in compatibility mode), object and array literals receive
the `any` type.

PR Close #35462
This commit is contained in:
Alex Rickabaugh
2020-02-14 13:30:43 -08:00
committed by Miško Hevery
parent a61fe4177f
commit 4253662231
7 changed files with 33 additions and 2 deletions
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aio/content/guide/template-typecheck.md
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@ -121,6 +121,7 @@ In case of a false positive like these, there are a few options:
|`strictOutputEventTypes`|Whether `$event` will have the correct type for event bindings to component/directive an `@Output()`, or to animation events. If disabled, it will be `any`.|
|`strictDomEventTypes`|Whether `$event` will have the correct type for event bindings to DOM events. If disabled, it will be `any`.|
|`strictContextGenerics`|Whether the type parameters of generic components will be inferred correctly (including any generic bounds). If disabled, any type parameters will be `any`.|
|`strictLiteralTypes`|Whether object and array literals declared in the template will have their type inferred. If disabled, the type of such literals will be `any`.|
If you still have issues after troubleshooting with these flags, you can fall back to full mode by disabling `strictTemplates`.