40 lines
2.3 KiB
Markdown
40 lines
2.3 KiB
Markdown
|
# `@aws-sdk/core`
|
||
|
|
|
||
|
|
This package provides common or core functionality to the AWS SDK for JavaScript (v3).
|
||
|
|
|
||
|
|
You do not need to explicitly install this package, since it will be transitively installed by AWS SDK clients.
|
||
|
|
|
||
|
|
## `@aws-sdk/core` submodules
|
||
|
|
|
||
|
|
Core submodules are organized for distribution via the `package.json` `exports` field.
|
||
|
|
|
||
|
|
`exports` is supported by default by the latest Node.js, webpack, and esbuild. For react-native, it can be
|
||
|
|
enabled via instructions found at [reactnative.dev/blog](https://reactnative.dev/blog/2023/06/21/package-exports-support).
|
||
|
|
|
||
|
|
Think of `@aws-sdk/core` as a mono-package within the monorepo.
|
||
|
|
It preserves the benefits of modularization, for example to optimize Node.js initialization speed,
|
||
|
|
while making it easier to have a consistent version of core dependencies, reducing package sprawl when
|
||
|
|
installing an SDK client.
|
||
|
|
|
||
|
|
### Guide for submodules
|
||
|
|
|
||
|
|
- Each `index.ts` file corresponding to the pattern `./src/submodules/<MODULE_NAME>/index.ts` will be
|
||
|
|
published as a separate `dist-cjs` bundled submodule index using the `Inliner.js` build script.
|
||
|
|
- create a folder as `./src/submodules/<SUBMODULE>` including an `index.ts` file and a `README.md` file.
|
||
|
|
- The linter will throw an error on missing submodule metadata in `package.json` and the various `tsconfig.json` files, but it will automatically fix them if possible.
|
||
|
|
- a submodule is equivalent to a standalone `@aws-sdk/<pkg>` package in that importing it in Node.js will resolve a separate bundle.
|
||
|
|
- submodules may not relatively import files from other submodules. Instead, directly use the `@scope/pkg/submodule` name as the import.
|
||
|
|
- The linter will check for this and throw an error.
|
||
|
|
- To the extent possible, correctly declaring submodule metadata is validated by the linter in `@aws-sdk/core`.
|
||
|
|
The linter runs during `yarn build` and also as `yarn lint`.
|
||
|
|
|
||
|
|
### When should I create an `@aws-sdk/core/submodule` vs. `@aws-sdk/new-package`?
|
||
|
|
|
||
|
|
Keep in mind that the core package is installed by all AWS SDK clients.
|
||
|
|
|
||
|
|
If the component functionality is upstream of multiple clients, it is
|
||
|
|
a good candidate for a core submodule. For example, XML serialization.
|
||
|
|
|
||
|
|
If the component's functionality is downstream of a client, for example S3 pre-signing,
|
||
|
|
it should be a standalone package with potentially a peer or runtime dependency on an AWS SDK client.
|