isolate-package
Advanced tools
Isolate a monorepo package by bundling the build output with its shared workspace packages and lock file to form a self-contained directory.
Isolate a monorepo workspace package so that it can be deployed as a completely self-contained directory with the sources of all its local dependencies included.
This solution was developed out of a desire to deploy to Firebase from a monorepo without resorting to hacks, shell scripts and manual tasks. I have written an article explaining the issue here.
There is nothing Firebase specific to this solution but I am currently not aware of other reasons to isolate a workspace package. If you find a different use-case, I would love to hear about it.
In the code and text you see the word manifest a lot, and it simply means to the
contents of a package.json file.
This describes the steps required for Firebase deployment in the most common
use-cases, assuming your are using a fairly typical monorepo setup, and your
firebase.json config lives in the package where you deploy from. If this
doesn't work for you, continue reading the Prerequisites
section, as you might have to tweak your package.json files a bit.
pnpm add isolate-package -D (or the Yarn
/ NPM equivalent) from the root of the package you would like to deploy to
Firebase.firebase.json config (assuming it lives in the package you deploy
from) set "source" to "./isolate" and "predeploy" to ["turbo build", "isolate"] or whatever fits your build tool.npx firebase deploy or
npx firebase deploy --only functions if your package only contains code for
functions.I recommend keeping your firebase.json file inside the package (as opposed to
the monorepo root), because it keeps things clean and allows you to deploy to
firebase from multiple independent packages.
Because historically many different approaches to monorepos exist, we need to establish some basic rules for the isolate process to work.
This one might sound obvious, but if the package.json from the package you are
targeting does not list the other monorepo packages it depends on, in either the
dependencies or devDependencies list, then the isolate process will not
include them in the output.
How dependencies are listed with regards to versioning is not important, because packages are matched based on their name. For example the following flavors all work:
// package.json
{
"dependencies": {
"shared-package": "workspace:*",
"shared-package": "*",
"shared-package": "../shared-package",
"shared-package": "^1.0.0"
}
}
So basically, version information is ignored, and if the package name can be found in the list of local monorepo packages, it will be processed regardless of its version specifier.
The isolate process uses (p)npm pack to extract files from package
directories, just like publishing a package would.
For this to work it is required that you define the files property in each
package.json manifest, as it declares what files should be included in the
published output.
Typically the value contains an array with just the name of the build output directory, for example:
// package.json
{
"files": ["dist"]
}
The version field is also required for pack to execute. I personally always
set it to "0.0.0" to indicate that the version does not have a practical
function.
A few additional files will be included by pack automatically, like the
package.json and README.md files.
Tip If you deploy to Firebase 2nd generation functions, you might want to include some .env files in the "files" list, so they are packaged and deployed together with your build output (as 1st gen functions config is no longer supported).
At the moment, nesting packages inside packages is not supported.
When building the registry of all local packages, isolate doesn't drill down
into the folders. So if you declare your packages to live in packages/* it
will only find the packages directly in that folder and not at
packages/nested/more-packages.
You can, however, declare multiple packages folders like ["packages/*", "apps/*"]. It's just that the structure inside them should be flat.
Run npm install isolate-package --dev or the equivalent for yarn or pnpm.
This package exposes the isolate executable. Once installed you can run npx isolate in any package directory after you have build the source files. By
default this will produce a directory at ./isolate but this can be configured.
You will probably want to add the output directory to your .gitignore file.
You can deploy to Firebase from multiple packages in your monorepo, so I advise
you to co-locate your firebase.json file with the source code, and not place
it in the root of the monorepo. If you do want to keep the firebase config in
the root, some additional configuration is required, so read on.
In order to deploy to Firebase, the functions.source setting in
firebase.json needs to point to the isolated output folder, which would be
./isolate when using the default configuration.
The predeploy phase should first build and then isolate the output.
Here's an example using Turborepo:
// firebase.json
{
"functions": {
"source": "./isolate",
"predeploy": ["turbo build", "isolate"]
}
}
With this configuration you can then run firebase deploy --only functions from
the package.
If you like to deploy to Firebase Functions from multiple packages you will also
need to configure a unique codebase identifier for each of them. For more
information, read
this.
Make sure your Firebase package adheres to the things mentioned in
prerequisites and its manifest file contains the field
"main", or "module" if you set "type": "module", so Firebase knows the
entry point to your source code.
If, for some reason, you choose to keep the firebase.json file in the root of
the monorepo you will have to place a configuration file called
isolate.config.json in the root with the following content:
// isolate.config.json
{
"targetPackagePath": "./packages/your-firebase-package"
}
The Firebase configuration should then look something like this:
// firebase.json
{
"functions": {
"source": "./packages/your-firebase-package/isolate",
"predeploy": ["turbo build", "isolate"]
}
}
For most users no configuration should be required. You can configure the
isolate process by placing a isolate.config.json file in the package that you
want to isolate, except when you're deploying to Firebase from the root of the
workspace.
For the config file to be picked up, you will have to execute isolate from the
same location, as it uses the current working directory.
Below you will find a description of every available option.
Type: string | undefined, default: undefined
The name of the build output directory name. When undefined it is automatically
detected via tsconfig.json. When you are not using Typescript you can use this
setting to specify where the build output files are located.
Type: boolean, default: Depends on package manager.
Sets the inclusion or exclusion of the lockfile as part of the deployment. For Yarn and NPM the lockfiles are included by default, but for PNPM they are excluded by default because they are not supported yet. For more information see lockfiles.
Type: boolean, default: false
By default devDependencies are ignored and stripped from the isolated output
package.json files. If you enable this the devDependencies will be included
and isolated just like the production dependencies.
Type: string, default: "isolate"
The name of the isolate output directory.
Type: "info" | "debug" | "warn" | "error", default: "info".
Because the configuration loader depends on this setting, its output is not
affected by this setting. If you want to debug the configuration set
ISOLATE_CONFIG_LOG_LEVEL=debug before you run isolate
Type: string, default: undefined
Only when you decide to place the isolate configuration in the root of the
monorepo, you use this setting to point it to the target you want to isolate,
e.g. ./packages/my-firebase-package.
If this option is used the workspaceRoot setting will be ignored and assumed
to be the current working directory.
Type: string, default: "./tsconfig.json"
The path to the tsconfig.json file relative to the package you want to
isolate. The tsconfig is only used for reading the compilerOptions.outDir
setting. If no tsconfig is found, possibly because you are not using Typescript
in your project, the process will fall back to the buildDirName setting.
Type: string[] | undefined, default: undefined
When workspacePackages is not defined, isolate will try to find the packages
in the workspace by looking up the settings in pnpm-workspace.yaml or
package.json files depending on the detected package manager.
In case this fails, you can override this process by specifying globs manually.
For example "workspacePackages": ["packages/*", "apps/*"]. Paths are relative
from the root of the workspace.
Type: string, default: "../.."
The relative path to the root of the workspace / monorepo. In a typical
repository you will have a packages and possibly an apps directory, and both
contain packages, so any package you would want to isolate is located 2 levels
up from the root.
For example
apps
├─ api
│ ├─ package.json
│ └─ .eslintrc.js
└─ web
├─ package.json
└─ .eslintrc.js
packages
└─ eslint-config-custom
├─ index.js
└─ package.json
When you use the targetPackagePath option, this setting will be ignored.
If something is not working, I advise you to add a isolate.config.json file,
and set "logLevel" to "debug". This should give you detailed feedback in the
console.
In addition define an environment variable to debug the configuration being used
by setting ISOLATE_CONFIG_LOG_LEVEL=debug before you execute isolate
When debugging Firebase deployment issues it might be convenient to trigger the
isolate process manually with npx isolate and possibly
ISOLATE_CONFIG_LOG_LEVEL=debug npx isolate
The lockfiles for NPM as well as the Yarn v1 and v3 seem to have a flat structure unrelated to the workspace packages structure, so they are copied to the isolate output as-is.
The PNPM lockfile clearly has a structure describing the different packages by their relative paths, and so to correct the lockfile it is adapted before being stored to the isolate directory.
However, there is still an issue with the PNPM lockfile conversion and it is unusable at the moment. Until that is resolved, the lockfile is automatically excluded for PNPM.
Personally, I don't see this as a big problem. I am declaring versions with ^
in my manifest, which means that a missing lockfile can only ever result in
unexpected patch versions, and I am not using dependencies that are likely to
break on patch version changes.
Isolate package has been designed to work with all package managers. Personally I have been testing it with NPM 9, Yarn 1.22, Yarn 3.6 and PNPM 8 on a fairly complex real-life project.
The isolate process will infer the package manager name and version from the "packageManager" field in the manifest located in root of your monorepo. If the field is empty it will then infer it from the type of lockfile found and the version that the OS reports for the installed executable. This is just so we can make some distinction in the code where needed, but until now it is hardly necessary.
For example, the PNPM pack process is preferred over the default NPM pack if
PNPM in used, simply because it seems to be much faster.
The Firebase cloud deploy pipeline will use the package manager that matches lockfile that was found in the deployed package.
If you are using Yarn 3 with zero-installs, the deployed package is not aware of
that, because the .yarnrc file and .yarn folder are located in the root of
your monorepo, and the version is not recorded as part of the lockfile. Therefor
the Firebase deploy could pipeline will likely use Yarn 1 to install your
dependencies. I don't think that is an issue but it might be good to know.
The isolate binary is an ES module. It is required to have the .mjs file
extension, otherwise a non-ESM workspace will try to load it as commonJS. For
details on this read this article from Alex
Rauschmayer
For PNPM the hashbang at the top of the script was not required, but Yarn 3 did not seem to execute without it.
FAQs
Isolate a monorepo package with its shared dependencies to form a self-contained directory, compatible with Firebase deploy
The npm package isolate-package receives a total of 6,922 weekly downloads. As such, isolate-package popularity was classified as popular.
We found that isolate-package demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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