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Update: separate eslint --init #79

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merged 11 commits into from
Jun 10, 2021
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- Repo: [eslint/eslint](https://github.com/eslint/eslint)
- Start Date: 2020-06-29
- RFC PR: https://github.com/eslint/rfcs/pull/79
- Authors: Aniketh Saha ([anikethsaha](https://github.com/anikethsaha)) aladdin-add([email protected])

# Move --init flag into a separate utility

## Summary

- Move the `init` command from main repo ([eslint](https://github.com/eslint/eslint)) to a new repo named `@eslint/create`.
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- Remove the auto-config.

## Motivation

Currently the whole `init` command is being shipped with the cli in the main repo. Though its not that much of size (roughly ~0.6MB for the [eslint/lib/init](https://github.com/eslint/eslint/tree/master/lib/init)), this command is not a type of command that we need everyday or everytime running eslint. It is mainly used when creating a new project or adding eslint to a project for the first time. So if we move this to a separate package that is meant to use in the command line,
We will make use of tools like `npx` to simply run `npx @eslint/create` or using `npm` to run `npm init @eslint` or using `yarn` to run `yarn create @eslint` single time for a project instead of having it in the core project.

## Detailed Design

<!--
This is the bulk of the RFC.

Explain the design with enough detail that someone familiar with ESLint
can implement it by reading this document. Please get into specifics
of your approach, corner cases, and examples of how the change will be
used. Be sure to define any new terms in this section.
-->

The implementation is mainly migrating the code from main repo to `@eslint/create`.

The approach would be following these steps

### Move `eslint --init` related files to a separate repo

- Move the `eslint/lib/init/*` to the new repo's `lib/*` directory
- Add the following `dependencies` in `package.json`(the last 3 dependencies will be removed in next step)
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- `enquirer`
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- `progress`
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- `semver`
- `lodash`
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- `json-stable-stringify-without-jsonify`
- `cross-spawn`
- `debug`
- `@eslint/eslintrc` (to be removed)
- `eslint` (to be removed)
- `espree` (to be removed)

- for all those modules coming inside `../**/*`, it would be replaced using `eslint/**/*`
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- For `tests`, move the `tests/lib/init` to new repo's `tests/lib/`
- Add the following `devDependencies` in `package.json`

- `chai`
- `sinon`
- `js-yaml`
- `proxyquire`
- `shelljs`

It was almost done: [aladdin-add/eslint-create](https://github.com/aladdin-add/eslint-create).
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I will transfer the repo to the eslint group later.

### Remove eslint auto-config

- Remove auto-config(`eslint/lib/init/autoconfig.js`), and its tests(`eslint/tests/lib/init/autoconfig.js`)
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### Update eslint cli usage

- Whenever `--init` command is being used, show a warning(e.g. "You can also run this command directly using 'npm init @eslint'") and run `npx @eslint/create` using `child_process` of the native node modules.


## Documentation

<!--
How will this RFC be documented? Does it need a formal announcement
on the ESLint blog to explain the motivation?
-->

- Documentation for `@eslint/create` will be created with proper usage and each prompt's details. In the main documentation, a link to `@eslint/create` will be given [here](https://github.com/eslint/eslint/blob/master/docs/user-guide/command-line-interface.md#--init) and basic usage and the package details will be documented.
Also in the cli command options, [here](https://github.com/eslint/eslint/blob/master/docs/user-guide/command-line-interface.md#options), for `--init` we need to change the description.
- It is not a breaking change, so a formal announcement in not needed.

## Drawbacks

<!--
Why should we *not* do this? Consider why adding this into ESLint
might not benefit the project or the community. Attempt to think
about any opposing viewpoints that reviewers might bring up.

Any change has potential downsides, including increased maintenance
burden, incompatibility with other tools, breaking existing user
experience, etc. Try to identify as many potential problems with
implementing this RFC as possible.
-->

- This might increase the maintenance burden as this will add one more repo in the organization.
- We may need to face challenges like re-directing of issues from `@eslint/create` repo to `eslint` and vice-versa.

## Backwards Compatibility Analysis

<!--
How does this change affect existing ESLint users? Will any behavior
change for them? If so, how are you going to minimize the disruption
to existing users?
-->

- Users can use `eslint --init`, which is as the same as current.
- Users can no longer use auto-config.

## Alternatives

<!--
What other designs did you consider? Why did you decide against those?

This section should also include prior art, such as whether similar
projects have already implemented a similar feature.
-->

The current implementation in `eslint` repo is the alternative. No changes needed.

## Open Questions

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This section is optional, but is suggested for a first draft.

What parts of this proposal are you unclear about? What do you
need to know before you can finalize this RFC?

List the questions that you'd like reviewers to focus on. When
you've received the answers and updated the design to reflect them,
you can remove this section.
-->

- Do we want to implement this as monorepo under `eslint` repo or a separate repo `@eslint/create` but github will make it as `eslint-create` or similar ?

We decided not to go in the monorepo direction for this.

- What should be the name of the package/repo?

We got a consensus on @eslint/create and eslint-create.