Add support for union types that indicate a default type for targets
that do not support unions, or do not support unions in certain
positions (e.g. output properties). The NodeJS backend makes use of this
in combination with a new flag, `disableUnionOutputTypes`, to avoid
generating unions in output types.
These changes also refactor the various module ->
package/module/namespace mapping methods so that these entities can be
fetched by their language name rather than their token.
These changes are necessary in order to move tfgen over to the schema
code generator.
The schema generator for tfgen has an annoying behavior for nested types
in which it does not separate input and output types. Worse, the shape
of the type that results from a collision of input and output types is
order-dependent: whichever of the two was observed last wins (note that
the shape is still determenistic, as the order in which types are
recorded is always the same). As a result, the NodeJS code generator
needs to know the set of required properties for the other aspect of the
type in order to generate proper code.
Contributes to
https://github.com/pulumi/pulumi-terraform-bridge/issues/179.
Some type tokens contain characters that are not valid in a single
URL path element (`/` in particular). These type tokens may be
path-escaped, and should be unescaped before they are interpreted.
Some property names are mapped from their `camelCase` Pulumi name to a
`snake_case` Python name. This mapping is irregular, and only occurs for
resources properties and function calls.
Note that there's still more work to do here: this only fixes names on
the output side; the input side is still broken for nested resource
proprerties and function calls.
The underlying design--annotated types in `hcl2/model`--may need some
additional work in the future, but I _believe_ it's good enough for now.
Some properties have constant values, such as the
apiVersion and kind for the Kubernetes provider. Add
a Const field to the Property schema to support this.
Replace the various `defaults` maps in the schema with per-property
`default` and `defaultInfo` fields. The former holds the static default
value; the latter holds the envvars and language-specific info.
Also, fix a minor bug in the Python codegen that caused diffs in
property docstrings.
The schema format is described in pkg/codegen/schema/schema.go. The code
generators are derived from the code generators contained in
https://github.com/pulumi/pulumi-terraform-bridge/pkg/tfgen, with the
exception of the Go code generator, which is net new.
