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https://github.com/RyuuGan/sol-merger

Merges all imports into single file for solidity contracts
https://github.com/RyuuGan/sol-merger

flattener merger one-file smart-contracts solidity

Last synced: 3 months ago
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Merges all imports into single file for solidity contracts

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README 

        
### Build status



![Build status](https://github.com/RyuuGan/sol-merger/actions/workflows/node.js.yml/badge.svg)



### Quick Usage



```javascript

const { merge } = require('sol-merger');



// Get the merged code as a string

const mergedCode = await merge('./contracts/MyContract.sol');

// Print it out or write it to a file etc.

console.log(mergedCode);

```



### CLI Usage



Right now it only works with solidity files that are in `node_modules`

or relative to your solidity file.



Simple usage:



```sh

npm i --save-dev sol-merger

```



Then add following line to your `package.json`.



```json

{

  "scripts": {

    "build-contracts": "sol-merger \"./contracts/*.sol\" ./build"

  }

}

```



This will allow you to use `npm run build-contracts` in your project directory.



Note that contracts glob should be surrounded with `"`



If no output file specified then output file will be created at the same

directory and appended with `_merged` (by default), i.e. `MyContract_merged.sol`. You can also

change this behaviour by specifying `--append` option:



```sh

sol-merger --append _me "./contracts/*.sol"

sol-merger -a _me "./contracts/*.sol"

```



You may need to use `npm run` to invoke the program standalone, as in `npm run sol-merger`.



You can also get help via `--help` command



```sh

sol-merger -h

sol-merger --help

```



More info about `glob` available at [node-glob repository](https://github.com/isaacs/node-glob)



See tests for more examples.



# Post processing support



It is possible right now to write your own plugins to process exports.

Currently state is not used in plugins. To see available plugins

[take a look plugins page](https://github.com/RyuuGan/sol-merger/tree/develop/lib/plugins).



All default plugins are available via shortcut syntax using filename:



```

sol-merger --export-plugin SPDXLicenseRemovePlugin "test/contracts/*.sol" compiled

```



It is also possible to use external plugins via relative path to plugin

or path relative to `node_modules`:



```sh

sol-merger --export-plugin ./dist/lib/plugins/SPDXLicenseRemovePlugin.js "test/contracts/*.sol" compiled



sol-merger --export-plugin sol-merger/lib/plugins/SPDXLicenseRemovePlugin.js "test/contracts/*.sol" compiled

```



Note that file extension is required for plugin to be loaded.



# Additional root folders for searching contracts



By default, `sol-merger` only searches for contracts in the `node_modules` folder.

However, you can include additional root folders to search for contracts.

This can be done by passing a CLI argument or a parameter through the code.



If additional root folders are specified, `sol-merger` will first search for

the contract in the `node_modules` folder and then in the additional root folders.

Multiple folders can be included by passing a CLI argument multiple times.



Example of usage in CLI:



```sh

sol-merger --additional-root "./test/contracts/imports" "test/contracts/ImportWithAdditionalRoot.sol" compiled

```



Example of usage in code:



```ts

const merger = new Merger({

  delimeter: '\n\n',

  additionalRoots: ['./test/contracts/imports'],

});

```



# Debuging



It is possible to setup environment variable to see what is happening under the hood

when contracts are being compiled:



```sh

export DEBUG="sol-merger*"

```



# Plugin for VSCode



I created a plugin for `VSCode` so you can use it instead of `sol-merger`: [Solidity Contracts Merger](https://marketplace.visualstudio.com/items?itemName=RyuuGan.sol-merger-vscode).



Hope you will like it.