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https://github.com/haroldadmin/functions-differ
Tool to find Firebase Functions that changed for selective redeployments
https://github.com/haroldadmin/functions-differ
ci esbuild firebase serverless
Last synced: 19 days ago
JSON representation
Tool to find Firebase Functions that changed for selective redeployments
- Host: GitHub
- URL: https://github.com/haroldadmin/functions-differ
- Owner: haroldadmin
- Created: 2021-04-18T06:39:48.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2023-10-02T10:23:01.000Z (about 1 year ago)
- Last Synced: 2024-10-18T20:29:18.783Z (27 days ago)
- Topics: ci, esbuild, firebase, serverless
- Language: TypeScript
- Homepage: https://www.npmjs.com/package/functions-differ
- Size: 125 KB
- Stars: 40
- Watchers: 3
- Forks: 13
- Open Issues: 7
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# functions-differ
[](https://github.com/haroldadmin/functions-differ/actions/workflows/build-test.yml)
[](https://www.npmjs.com/package/functions-differ)
[](https://www.npmjs.com/package/functions-differ)
A tool to selectively deploy only the Firebase Functions that changed.
[functions-differ](https://www.npmjs.com/package/functions-differ) takes a list of Firebase Functions from your repository and returns a list of functions that changed since its last invocation.
This helps you selectively deploy only the functions that changed, thus saving time during re-deployments.
It detects any changes to a function by bundling it into a single minified file, and calculating a hash for it. This works for changes in the function's code, changes in its installed dependencies, or any other local imports.
## Usage
- Create a `.differspec.json` file in the directory containing your Firebase Functions:
```shell
my-firebase-project
├── firebase.json
├── functions
├── src
└── .differspec.json
```
- Specify your function names and their paths in `.differspec.json`:
> This step is optional if you use the experimental `--discover` flag, which lets functions-differ discover the exported Cloud Functions from your project automatically.
```json
{
"functions": {
"login": "src/auth/login/function.ts",
"register": "src/auth/login/function.ts"
}
}
```
- Run `functions-differ` in the directory containing `.differspec.json`
```shell
cd my-firebase-project/functions
functions-differ
```
- `functions-differ` will then output a list of functions that need to be (re)deployed. This includes any functions that were changed or added since its last invocation.
```shell
> functions-differ
functions:login,functions:register
```
The default output is suitable for passing to `firebase deploy --only` command.
## Options
`functions-differ` supports the following options:
| Name | Alias | Description | Default |
| ------------- | ----- | ------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------- |
| dir | d | The directory containing `.differspec.json` file | (current working directory) |
| write | w | Write output to `.differspec.json` file or not | true |
| verbose | v | Output verbose logs | false |
| prefix | | Prefix for each function name output | `functions:` |
| sep | | Separator for each output function | `,` |
| bundlerConfig | | Path to the bundler config file which would be passed to esbuild | |
| concurrency | | Number to control the concurrency of the bundling process. Useful in CI/CD flows with limited memory | Number of functions in .differspec.json |
| discover | | (**Experimental**) Flag indicating whether to use automatic function path discovery | true |
| no-discover | | (**Experimental**) Negates the `--discover` flag | |
| indexFilePath | | (**Experimental**) Location of the index.ts file which exports all the functions. Optional. Only used if used with `--discover` | `src/index.ts` |
## .differspec.json
`.differspec.json` serves as persistent storage for `functions-differ`. It contains the following properties:
| Name | Description |
| ----------- | ----------------------------------------------------------------------------------------------------------------------------- |
| `functions` | JSON object containing names of functions in the repository along with their paths |
| `hashes` | (**AUTOGENERATED, DO NOT MODIFY**) JSON object containing hashes of all functions in the `functions` property |
| `lastDiff` | (**AUTOGENERATED, DO NOT MODIFY**) JSON object containing the results of the last successful invocation of `functions-differ` |
- The `hashes` and `lastDiff` properties are autogenerated by `functions-differ`, and should not be created/edited manually.
## Contributions
Please discuss bugs, feature requests, and help in Github Issues. Pull requests are welcome, but please make sure to open an issue for your changes first.
## Installation
Install the package with `npm`:
`npm install -g functions-differ`
## Notes
### Automatic Functions Discovery (Experimental)
`functions-differ` has experimental support for discovering Cloud Functions exported from your project automatically. This lets you skip defining function paths in your `.differspec.json` file manually.
It does this by using the TypeScript AST on exports from your project's root `index.ts` file. It makes the following assumptions about your codebase:
1. The `src/index.ts` file must contain all exported Cloud Functions from your project, and no other exports.
2. Every Cloud Function is defined in a separate file. E.g.: `src/auth/login/index.ts`, `src/auth/register/index.ts`, etc.
If you use automatic functions discovery in your project, make sure the above assumptions hold true.
### Integration with CI/CD
I built `functions-differ` to help reduce the average deployment time of Cloud Functions in a project, but does not offer native support for CI builds.
Files generated during CI builds are usually ephemeral. They are lost once the CI build completes. If you plan to run `functions-differ` in your CI workflow, you need to backup the `.differspec.json` generated by the previous build, and restore it for the next built.
Here are some ways to do that for GitHub Actions:
1. Use [caching](https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows) between CI runs for the `.differspec.json` file.
2. Read/store the contents of the `.differspec.json` file in GitHub secrets in each CI run using the `gh` CLI available to every job.
This tool uses ESBuild internally to bundle Cloud Functions in parallel. Bundling is a resource intensive process.
If your CI builds appear to crash or run very slowly after integrating functions-differ, it could be due to high memory usage by ESBuild. Consider using the `--concurrency` option to control how many Cloud Functions to bundle in parallel.