- Quickstart
- Features
- Installation
- Usage
- Troubleshooting
- Prerequisites
- Configuration Options
- API
- The internal packages strategy
- Firebase
Run npx isolate-package isolate from the monorepo package you would like to
isolate.
If you would like to see an example of a modern monorepo with this tool integrated, check out mono-ts
- Isolate a monorepo workspace package to form a self-contained package that includes internal dependencies and an adapted lockfile for deterministic deployments.
- Preserve packages file structure, without code bundling
- Should work with any package manager, and tested with NPM, PNPM, and Yarn (both classic and modern)
- Zero-config for the vast majority of use-cases
- Isolates dependencies recursively. If package A depends on internal package B which depends on internal package C, all of them will be included
- Optionally force output to use NPM with matching versions
- Optionally include devDependencies in the isolated output
- Optionally pick or omit scripts from the manifest
- Compatible with the Firebase tools CLI, including 1st and 2nd generation Firebase Functions. For more information see the Firebase instructions.
- Available in a forked version of firebase-tools to preserve live code updates when running the emulators
Run pnpm install isolate-package -D or the equivalent for npm or yarn.
I recommended using pnpm over npm or yarn. Besides being fast and
efficient, PNPM has better support for monorepos.
!! If you plan use this for Firebase deployments, and you want to preserve live code updates when running the local emulators, you will want to use firebase-tools-with-isolate instead.
This package exposes a binary called isolate.
Run npx isolate from the root of the package you want to isolate. Make sure
you build the package first.
The isolate binary will try to infer your build output location from a
tsconfig file, but see the buildDirName configuration if you
are not using Typescript.
By default the isolated output will become available at ./isolate.
If you are here to improve your Firebase deployments check out the Firebase quick start guide.
If something is not working as expected, add an 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 DEBUG_ISOLATE_CONFIG=true before you execute isolate.
When debugging Firebase deployment issues it might be convenient to trigger the
isolate process manually with npx isolate and possibly
DEBUG_ISOLATE_CONFIG=true npx isolate.
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 (some depending on your package manager):
// package.json
{
"dependencies": {
"shared-package": "0.0.0"
"shared-package": "*",
"shared-package": "workspace:*",
"shared-package": "../shared-package",
}
}
So if the a package name can be found as part of the workspace definition, it will be processed regardless of its version specifier.
The version field is required for pack to execute, because it is use to
generate part of the packed filename. A personal preference is to set it to
"0.0.0" to indicate that the version does not have any real meaning.
NOTE: This step is not required if you use the internal packages strategy but you could set it to
["src"]instead of["dist"].
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 manifest, as it declares what files should be included in the published
output.
Typically, the value contains an array with only the name of the build output directory. For example:
// package.json
{
"files": ["dist"]
}
A few additional files from the root of your package will be included
automatically, like the package.json, LICENSE and README 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 internal 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 workspace packages directories. Personally, I
prefer to use ["packages/*", "apps/*", "services/*"]. It is only the structure
inside them that should be flat.
For most users no configuration should be necessary.
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: "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
DEBUG_ISOLATE_CONFIG=true before you run isolate
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: 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: undefined
Select which scripts to include in the output manifest scripts field. For
example if you want your test script included set it to ["test"].
By default, all scripts are omitted.
Type: string[], default: undefined
Select which scripts to omit from the output manifest scripts field. For
example if you want the build script interferes with your deployment target, but
you want to preserve all of the other scripts, set it to ["build"].
By default, all scripts are omitted, and the pickFromScripts configuration overrules this configuration.
Type: boolean, default: false
By default the packageManager field from the root manifest is copied to the target manifest. I have found that some platforms (Cloud Run, April 2024) can fail on this for some reason. This option allows you to omit the field from the isolated package manifest.
Type: string, default: "isolate"
The name of the isolate output directory.
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 setup
you will have a packages directory and possibly also an apps and a
services directory, all of which contain packages. So any package you would
want to isolate is located 2 levels up from the root.
For example
packages
├─ backend
│ └─ package.json
└─ ui
└─ package.json
apps
├─ admin
│ └─ package.json
└─ web
└─ package.json
services
└─ api
└─ package.json
When you use the targetPackagePath option, this setting will be ignored.
Alternatively, isolate can be integrated in other programs by importing it as
a function. You optionally pass it a some user configuration and possibly a
logger to handle any output messages should you need to write them to a
different location as the standard node:console.
import { isolate } from "isolate-package";
await isolate({
config: { logLevel: "debug" },
logger: customLogger,
});If no configuration is passed in, the process will try to read
isolate.config.json from the current working directory.
An alternative approach to using internal dependencies in a Typescript monorepo is the internal packages strategy, in which the package manifest entries point directly to Typescript source files, to omit intermediate build steps. The approach is compatible with isolate-package and showcased in my example monorepo setup
In summary this is how it works:
- The package to be deployed lists its internal dependencies as usual, but the package manifests of those dependencies point directly to the Typescript source (and types).
- You configure the bundler of your target package to include the source code
for those internal packages in its output bundle. In the case of TSUP for the
API service in the mono-ts
that configuration is:
noExternal: ["@mono/common"] - When
isolateruns, it does the same thing as always. It detects the internal packages, copies them to the isolate output folder and adjusts any links. - When deploying to Firebase, the cloud pipeline will treat the package manifest as usual, which installs the listed dependencies and any dependencies listed in the linked internal package manifests.
Steps 3 and 4 are no different from a traditional setup.
Note that the manifests for the internal packages in the output will still point to the Typescript source files, but since the shared code was embedded in the bundle, they will never be referenced via import statements. So the manifest the entry declarations are never used. The reason the packages are included in the isolated output is to instruct package manager to install their dependencies.
For detailed information on how to use isolate-package in combination with Firebase see this documentation
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