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Dependency injection using compile time code generation

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# Weld

Weld is a golang package that contains directives for "state and backends" dependency injection using compile time code generation.

Weld is heavily based on [github.com/google/wire](https://github.com/google/wire), borrowing its syntax and concepts, but tailoring it for backends-based dependency injection pattern.

Unlike wire, weld:
- Supports multiple providers for the same type by selecting the first provider found in the set using depth-first search.
- Supports transitive "backends-type" cyclic dependencies by adding these interfaces to the generated implementation. 
- Is much less dynamic & has fewer features: it takes a provider set as input and a backends as output and generates a `Make` function that returns an implementation of that backends interface.

For convenience it can also generate an aggregate Backends interface from the union of a slice of backends since golang doesn't support embedding interfaces with the same name or overlapping methods.

## Relation to wire syntax:
- Supported functions and types:
  - `wire.Bind`
  - `wire.Binding`
  - `wire.NewSet`
  - `wire.ProviderSet`
- Unsupported functions and types: 
  - `wire.Build` 
  - `wire.FieldsOf`
  - `wire.InterfaceValue`
  - `wire.Struct`
  - `wire.Value`

## Example
- See the [internal/testdata/example](./internal/testdata/example) project for how this is used.

weld

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