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f-f merged 3 commits into from
Jun 8, 2025
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monorepo multiple main modules documentation #1339

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monorepo multiple main modules documentation
peterbecich May 4, 2025
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Merge branch 'master' into multiple-main-modules
f-f Jun 8, 2025
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Update README.md
f-f Jun 8, 2025
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25 changes: 25 additions & 0 deletions README.md
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Expand Up @@ -831,6 +831,31 @@ The `--package` flag is also available for many more commands, such as `build`,

An important property of this "monorepo setup" is that the `output` folder will be shared between all the packages: they will share the same build package set (or build plan when using the solver) and they will be all build together.

#### Multiple Main Modules

Given
```
.
├── app1
│ ├── spago.yaml
│ └── src
│ └── Main.purs
├── app2
│ ├── spago.yaml
│ └── src
│ └── Main.purs
└── spago.yaml
```

, to avoid the error `Module Main has been defined multiple times`:
* `app1` `Main.purs` can have `module Main1`
* `app2` `Main.purs` can have `module Main2`

From the root, run:
* `spago run -p app1 --main Main1`
or
* `spago run -p app2 --main Main2`

### Polyrepo support

There might be cases where you want to have multiple loosely-connected codebases in the same repository that do _not_ necessarily build together all the time. This is sometimes called [a "polyrepo"][monorepo-tools].
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