typeexpr: Optional object attributes with defaults #549
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This commit extends the type expression package to add two new features: - In constraint mode, the `optional(...)` modifier can be used on object attributes to allow them to be omitted from input values to a type conversion process. Any such missing attributes will be replaced with a `null` value of the appropriate type upon conversion. - In the new defaults mode, the `optional(...)` modifier takes a second argument, which accepts a default value of an appropriate type. These defaults are returned alongside the type constraint, and may be applied prior to type conversion through the new `Defaults.Apply()` method. This change is upstreamed from Terraform, where optional object attributes have been available for some time. The defaults functionality is new and due to be released with Terraform 1.3.
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This commit extends the type expression package to add two new features:
optional(...)modifier can be used on object attributes to allow them to be omitted from input values to a type conversion process. Any such missing attributes will be replaced with anullvalue of the appropriate type upon conversion.optional(...)modifier takes a second argument, which accepts a default value of an appropriate type. These defaults are returned alongside the type constraint, and may be applied prior to type conversion through the newDefaults.Apply()method.This change is upstreamed from Terraform, where optional object attributes have been available for some time. The defaults functionality is new and due to be released with Terraform 1.3.