[flow][vscode] Check in oss extension and rewrite in TS

Summary:
Internally, we have an internal-only extension that is much better maintained than the current oss one in https://github.com/flow/flow-for-vscode. Notably, it doesn't support the detailed error rendering and refinement highlighting improvements we have made this year.

I want to correct this situation so that we have a consistent baseline of Flow experience. Since so much drift has already happened and we have done nothing to correct this for almost two years, it's clear that the status-quo won't work and we need to do something different so that it's sustainable to keep the internal and the oss extension in sync.

Therefore, in this diff, I:

1. Check in the code from https://github.com/flow/flow-for-vscode mostly as is with regard to runtime behavior. By moving the code here, we can land changes on both internal and oss extension much more easily.
2. Rewrite in TS (mostly syntactic changes): our internal extension is in TS. The VSCode type definition is in TS. There is way too much work to convert the TS libdef to flow. It will also be easier to directly copy the code from internal to oss extension or vise-versa. It might make us look bad that we are not even dogfooding flow in our own repos, but it's still better than it being a major blocker so that the community gets almost nothing.

Apart from these major decisions, I did some minor cleanups:

1. bumping some dependencies
2. bumping bundled flow
3. removing the prettier formatting in extension (we used to return poorly formatted stuff in hover, so we have to use prettier to re-format the hover results)
4. removing most of the unnecessary middleware stuff.

Changelog: [internal]

Reviewed By: gkz

Differential Revision: D67163378

fbshipit-source-id: 72a2c03ad884f0be06936920324ccdcfb4e1df13

packages/flow-for-vscode/.gitattributes

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+* text=auto

packages/flow-for-vscode/.gitignore

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+build
+node_modules
+npm-debug.log
+.DS_Store
+yarn-error.log

packages/flow-for-vscode/.vscodeignore

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+## exclude everything
+**/**
+
+## include source files ##
+!package.json
+# only include js files (not *.map)
+!build/*.js
+!node_modules/flow-bin
+# only include required prettier files in plugin to reduce plugin size
+!node_modules/prettier/standalone.js
+!node_modules/prettier/parser-flow.js
+
+## include extra files ##
+!README.md
+!readme
+!CHANGELOG.md
+!LICENSE
+!flow-logo.png
+!signing.pem
+!PAST_FLOW_BIN_SHASUMS.txt

packages/flow-for-vscode/CHANGELOG.md

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+# Changelog
+
+### [2.2.1](https://github.com/flowtype/flow-for-vscode/compare/2.2.0...2.2.1) (2023-01-06)
+
+* Fix a security vulnerability.
+
+### [2.2.0](https://github.com/flowtype/flow-for-vscode/compare/2.1.0...2.2.0) (2022-07-26)
+
+* Removed support for the `log.file` flowconfig option, since it contained a security vulnerability.
+* Upgraded bundled version to 0.183.0
+
+### [2.1.0](https://github.com/flowtype/flow-for-vscode/compare/2.0.0...2.1.0) (2022-03-15)
+
+* Prevent running versions of flow-bin < 0.110.0 in Restricted Mode, since those versions contained a security vulnerability.
+  * Upgraded bundled version to 0.110.1
+  * Removed support for flow-bin < 0.110.0 in Restricted Mode
+
+### [2.0.0](https://github.com/flowtype/flow-for-vscode/compare/1.9.2...2.0.0) (2022-02-09)
+
+* Removed support for legacy Flow integration. All communication with Flow now uses the Language Server Protocol.
+* The "Path To Flow" setting is now ignored in Restricted Mode.
+
+### [1.9.2](https://github.com/flowtype/flow-for-vscode/compare/1.9.1...1.9.2) (2021-09-07)
+
+#### Bug Fixes
+
+* **windows**: fix verification of `flow-bin` binaries ([9885ab6](https://github.com/flowtype/flow-for-vscode/commit/9885ab680b3f4ca8cc10ccb602fc7b6f9c1c125f))
+
+### [1.9.1](https://github.com/flowtype/flow-for-vscode/compare/1.9.0...1.9.1) (2021-07-12)
+
+#### Bug Fixes
+
+* restore compatibility with older versions of VS Code ([00a4ff0](https://github.com/flowtype/flow-for-vscode/commit/00a4ff0171b751f8c000541dc352d1b28ba68470))
+
+### [1.9.0](https://github.com/flowtype/flow-for-vscode/compare/1.5.0...1.9.0) (2021-06-29)
+
+#### Features
+
+* Verify integrity of `flow-bin` binaries ([af92850](https://github.com/flowtype/flow-for-vscode/commit/af92850998d2f3121ec475e6eaff5af163d9d301))
+* Allow clickable links on hover for type descriptions ([1a43503](https://github.com/flowtype/flow-for-vscode/commit/1a435034b519df8d985da496dfee0cdc89dc377f))
+
+### [1.5.0](https://github.com/flowtype/flow-for-vscode/compare/1.4.0...1.5.0) (2019-09-09)
+
+#### Bug Fixes
+
+* **windows:** closes [#362](https://github.com/flowtype/flow-for-vscode/issues/362) ([f1879e1](https://github.com/flowtype/flow-for-vscode/commit/f1879e1))
+
+#### Features
+
+* **flow-bin:** update bundled flow to v0.107.0 ([68f9ccf](https://github.com/flowtype/flow-for-vscode/commit/68f9ccf))
+
+### [1.4.0](https://github.com/flowtype/flow-for-vscode/compare/1.3.0...1.4.0) (2019-09-02)
+
+#### Bug Fixes
+
+* **windows:** fix `flow is running on a different directory` ([@Mayank1791989](https://github.com/Mayank1791989) in [cd0831b](https://github.com/flowtype/flow-for-vscode/commit/cd0831b)), closes [#260](https://github.com/flowtype/flow-for-vscode/issues/260)
+
+#### Features
+
+* **flow-bin:** update bundled flow to v0.106.3 ([a4389fc](https://github.com/flowtype/flow-for-vscode/commit/a4389fc))
+
+### [1.3.0](https://github.com/flowtype/flow-for-vscode/compare/1.2.0...1.3.0) (2019-08-04)
+
+#### Bug Fixes
+
+* **remote:** fix plugin not working with remote extension pack on windows ([@Mayank1791989](https://github.com/Mayank1791989) in [3dd4ecc](https://github.com/flowtype/flow-for-vscode/commit/3dd4ecc)), closes [#336](https://github.com/flowtype/flow-for-vscode/issues/336)
+
+#### Features
+
+* **flow-bin:** update bundled flow to v0.104.0 ([@Mayank1791989](https://github.com/Mayank1791989) in [5c15751](https://github.com/flowtype/flow-for-vscode/commit/5c15751))
+
+### 1.2.0 (July 20, 2019)
+
+#### Features
+* **flow-bin:** update bundled flow to v0.103.0 ([@Mayank1791989](https://github.com/Mayank1791989) in [8d50b98](https://github.com/flowtype/flow-for-vscode/commit/8d50b98))
+
+#### Bug Fixes
+* **lsp:** fix issue [#350](https://github.com/flowtype/flow-for-vscode/issues/350) ([@Mayank1791989](https://github.com/Mayank1791989) in [ec9c9e0](https://github.com/flowtype/flow-for-vscode/commit/ec9c9e0))
+
+### 1.1.4 (June 22, 2019)
+
+* **build:** fix issue [#341](https://github.com/flowtype/flow-for-vscode/issues/341) ([@Mayank1791989](https://github.com/Mayank1791989) in [c6bacf0](https://github.com/flowtype/flow-for-vscode/commit/c6bacf0))
+* **lsp:** accept flow release candidate version ([@telaoumatenyanis](https://github.com/telaoumatenyanis) in [#344](https://github.com/flowtype/flow-for-vscode/pull/344))
+
+### 1.1.3 (June 12, 2019)
+
+* Update bundled Flow to v0.101.0. ([@Mayank1791989](https://github.com/Mayank1791989) in [#340](https://github.com/flowtype/flow-for-vscode/pull/340))
+* Update Node, Babel, Prettier, and setup Jest for testing. ([@Mayank1791989](https://github.com/Mayank1791989) in [#340](https://github.com/flowtype/flow-for-vscode/pull/340))
+
+### 1.1.2 (June 11, 2019)
+
+* Add `useCodeSnippetOnFunctionSuggest`. ([@Mayank1791989](https://github.com/Mayank1791989) in [#337](https://github.com/flowtype/flow-for-vscode/pull/337))
+* Change `useNPMPackagedFlow` default to true. ([@Mayank1791989](https://github.com/Mayank1791989) in [#337](https://github.com/flowtype/flow-for-vscode/pull/337))
+* Fix bundle might be bigger than expected ([#327](https://github.com/flowtype/flow-for-vscode/issues/327)). ([@Mayank1791989](https://github.com/Mayank1791989) in [#337](https://github.com/flowtype/flow-for-vscode/pull/337))
+* Fix Intelllisense can't pick up functions in plain objects properly ([#335](https://github.com/flowtype/flow-for-vscode/issues/335)). ([@Mayank1791989](https://github.com/Mayank1791989) in [#337](https://github.com/flowtype/flow-for-vscode/pull/337))
+* Fix restart vs. restart client ([#323](https://github.com/flowtype/flow-for-vscode/issues/323)). ([@Mayank1791989](https://github.com/Mayank1791989) in [#337](https://github.com/flowtype/flow-for-vscode/pull/337))
+
+### 1.1.1 (March 30, 2019)
+
+* Fix extension activates even for non-Flow (and non-JS) projects. ([@Mayank1791989](https://github.com/Mayank1791989) in [#326](https://github.com/flowtype/flow-for-vscode/pull/326))
+
+### 1.1.0 (February 27, 2019)
+
+* Multiple config and multi-root workspace support - [@Mayank1791989](https://github.com/Mayank1791989) [#315](https://github.com/flowtype/flow-for-vscode/pull/315)
+
+### 1.0.1
+
+* Bug fix for infinite loop - [@Mayank1791989](https://github.com/Mayank1791989) [#305](https://github.com/flowtype/flow-for-vscode/pull/305)
+
+### 1.0.0
+
+* Converts Flow LSP support to be default, and moves to using the flow-lsp module as the base:
+  - [@Mayank1791989](https://github.com/Mayank1791989) [#295](https://github.com/flowtype/flow-for-vscode/pull/295)
+
+### 0.8.4
+
+* A potential fix for killing flow processes
+  - [@FDiskas](https://github.com/FDiskas) [#269](https://github.com/flowtype/flow-for-vscode/pull/269)
+
+* Fix go to definition for namespaced imports
+  - [@minedeljkovic](https://github.com/minedeljkovic) [#265](https://github.com/flowtype/flow-for-vscode/pull/265)
+
+### 0.8.2
+
+* Updates for the flow language-server-plugin
+  - [@thymikee](https://github.com/thymikee) [#258](https://github.com/flowtype/flow-for-vscode/pull/258)
+
+* Add `showUncovered` config option to activate uncovered code report by default
+  - [@HugoLime](https://github.com/HugoLime) [#256](https://github.com/flowtype/flow-for-vscode/pull/150)
+
+### 0.8.1
+
+* Adds windows support for the flow language-server-plugin
+  - [@jbachhardie](https://github.com/jbachhardie) [#239](https://github.com/flowtype/flow-for-vscode/pull/239)
+
+### 0.8.0
+
+* Adds experimental support for flow language-server-plugin, to use it set `flow.useLSP` to true in your project/global settings
+  - [@thymikee](https://github.com/thymikee) [#150](https://github.com/flowtype/flow-for-vscode/pull/150)
+* Bump Flow to 0.68
+  - [@thymikee](https://github.com/thymikee) [#221](https://github.com/flowtype/flow-for-vscode/pull/221)
+
+### 0.7.3
+
+* Improves `flow.pathToFlow` to allow passing in the workspace root `"${workspaceRoot}/node_modules/.bin/flow"`)
+  - [@rattrayalex](https://github.com/rattrayalex) [#173](https://github.com/flowtype/flow-for-vscode/pull/173)
+
+### 0.7.2
+
+* Fixes for flow not re-checking on file changes- [@clintwood][]
+* Add more file extensions for flow support - [@clintwood][]
+
+### 0.7.1
+* Adds a `flow.runOnAllFiles` option, which treats all files as if they had
+  `// @flow` at the top. - [@doshisid](https://github.com/doshisid) [#144](https://github.com/flowtype/flow-for-vscode/pull/144)
+
+### 0.7.0
+
+* Bundles `flow-bin` with the plugin to use in cases where it has not been
+  installed globally or locally. - [@BrainMaestro][] [#118](https://github.com/flowtype/flow-for-vscode/pull/118)
+* Improvements around flow file detection, and reducing the amount of duplicate requests to the flow server. - [@thymikee][] [#126](https://github.com/flowtype/flow-for-vscode/pull/126)
+
+### 0.6.0
+
+* Adds the status indicator (spinner) to the statusbar which appears when flow is
+  type checking, so that users can tell if everything type checked or if flow is
+  just not finished yet. Indicator can be disabled by setting `flow.showStatus` to
+  `false`. - [@gozala][] [#85](https://github.com/flowtype/flow-for-vscode/pull/85)
+* Type checks code as you type. Only unsaved changes in an active document are
+  considered (other unsaved documents are type checked by content on the disk).
+  This feature can be disabled by setting `flow.runOnEdit` to `false` - [@gozala][]
+  [#87](https://github.com/flowtype/flow-for-vscode/pull/87)
+* Adds the [flowtype.org/try](http://flowtype.org/try/) like functionality to allow
+  sketching, without setting up a project. Unsaved documents (ones created by
+  `Files: New Untitled File` command) in `javascript` / `javascriptreact` mode and
+  [`@flow` pragma](https://flowtype.org/docs/new-project.html#typechecking-your-files)
+  will be typechecked as you type (assuming `flow.runOnEdit` is set to `true`). Please
+  note that once file is saved, unless it's under project with `.flowconfig` it will
+  no longer be type checked un further edits. - [@gozala]
+  [#88](https://github.com/flowtype/flow-for-vscode/pull/88)
+* Adds Flow type coverage indicator, allowing to also toggle diagnosis of code uncovered by flow by clicking on it. – [@thymikee][] [#108](https://github.com/flowtype/flow-for-vscode/pull/108)
+* Redundant `[flow]` annotation is now removed. – [@thymikee][] [#106](https://github.com/flowtype/flow-for-vscode/pull/106)
+
+### 0.5.0
+
+* Uses the absolute path to the `where` command provided by Windows - [@JPanneel][] [#70](https://github.com/flowtype/flow-for-vscode/pull/70)
+* Uses the new VS Code autocompletion API for functions - [@orta][] [#51](https://github.com/flowtype/flow-for-vscode/pull/51)
+* When you want to work on the flow-for-vscode project, pressing run will start the
+  babel build watcher task - [@orta][]
+* Adds support for *.js.flow files ( such as those generated by graphql-js ) which are
+  treated as common JavaScript files - [@orta][]
+* Fixes "File not found" error with diagnostics when `flow status --json` provides
+  non-absolute file paths - [@ryanashcraft][] [#77](https://github.com/flowtype/flow-for-vscode/pull/77)
+
+### 0.4.0
+
+* Adds the ability to use flow from your project's node_modules folder.
+  This is a security risk ( see https://github.com/facebook/nuclide/issues/570) and so it
+  is hidden behind a user setting of `useNPMPackagedFlow` which needs to be set to `true`
+  for it to work. - [@orta][] [#53](https://github.com/flowtype/flow-for-vscode/pull/53)
+* Show flow errors that start at line 0 - [@orta][] [#54](https://github.com/flowtype/flow-for-vscode/pull/54)
+
+[@gozala]:https://github.com/Gozala
+[@orta]:https://github.com/orta
+[@thymikee]:https://github.com/thymikee
+[@JPanneel]:https://github.com/JPanneel
+[@ryanashcraft]:https://github.com/ryanashcraft
+[@BrainMaestro]:https://github.com/BrainMaestro
+[@clintwood]:https://github.com/clintwood

packages/flow-for-vscode/CODE_OF_CONDUCT.md

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+# Code of Conduct
+Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please [read the full text](https://code.fb.com/codeofconduct) so that you can understand what actions will and will not be tolerated.

packages/flow-for-vscode/CONTRIBUTING.md

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+# Instructions for Developers
+
+## Selfhost Setup
+
+- install Code: https://code.visualstudio.com/
+- git clone https://github.com/flowtype/flow-for-vscode.git
+- run `yarn install --pure-lockfile`
+- open Code on `flow-for-vscode`
+- link the extension into Code: `ln -s ABSOLUTE_PATH_OF_FLOW_FOR_VSCODE ~/.vscode/extensions/flow-for-vscode`
+- reload Code (`Cmd+Shift+P`, `Reload Window`) to enable the extension
+- make changes to the extension and reload to selfhost on your changes
+
+## Development
+
+- you can use the built-in babel task to start babel in watch mode (`Cmd+Shift+B` to start it, `Cmd+Shift+U` to toggle output)
+- make changes
+- open debug viewlet (`Cmd+Shift+D`) and run the extension to try changes (`F5`)
+- from the opened instance open a folder with flow files (`File | Open...`)