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Alex Taylor (alta)facebook-github-bot
Alex Taylor (alta)
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v0.246.0
Summary: happyflow Reviewed By: gkz Differential Revision: D62649129 fbshipit-source-id: 09f9b5d50382938f5981c8371ec6915ecb70bb6b
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Diff for: ‎Changelog.md

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### 0.246.0
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Likely to cause new Flow errors:
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* Support for $ObjMap has been completely removed. This change means that:
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* `$ObjMap` will resolve to a user-defined `$ObjMap` global if it's available in your libdef. You can use `type $ObjMap<O, F> = {[K in keyof O]: $Call<F, O[K]>}` to get most of the same behavior, except that in the mapped type version `O[K]` will include void for optional props. Please note that this should be considered as a permanent shim, because we intend to eventually remove `$Call`.
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* `flow codemod key-mirror` command was removed, since this codemod tries to convert `$ObjMap` to `$KeyMirror`
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* `deprecated-type-objmap` lint was removed.
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* Component syntax components without ref prop will have `void` as the instance, so `React.ElementRef<component>` of such component will return void.
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New Features:
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* Mapped types now support array and tuple types in the form of `{[K in keyof <array or tuple type>: <mapped type>}`.
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* With this support, we intend to deprecate $TupleMap in the next release and remove the support for $TupleMap eventually
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* You can now refine against variables and member expressions with a literal type, not just literal themselves.
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Notable bug fixes:
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* Flow now only reports one error when two disjoint large enum-like unions are compared ([example](https://flow.org/try/#1N4Igxg9gdgZglgcxALlAIwIZoKYBsD6uEEAztvhgE6UYCe+JADpdhgCYowa5kA0I2KAFcAtiRQAXSkOz9sADwxgJ+NPTbYuQ3BMnTZA+Y2yU4IwRO4A6SFBIrGVDGM7c+h46fNRLuKxJIGWh8MeT0ZfhYlCStpHzNsFBAMIQkIEQwJODAQfiEyfBE4eWw2fDgofDBMsAALfAA3KjgsXGxxZC4eAw0G-GhcWn9aY3wWZldu-g1mbGqJUoBaCRHEzrcDEgBrbAk62kXhXFxJ923d-cPRHEpTgyEoMDaqZdW7vKgoOfaSKgOKpqmDA+d4gB5fMA-P6LCCMLLQbiLOoYCqgh6-GDYRYIXYLSgkRZkCR4jpddwPfJLZjpOBkO4AX34kA0SQAOlANE8qNgAASAnn4ZA84G0ADc7PZMAeyjg0B5C3sAEYABQASh5wHZPO18tWPIAKoqeQBeHkAcgwirNPIAPua0FbbeawFbxVAdbrjAaAEwm80Yb3Wu1mtCBp0hgDMZrdWp1+GFJANRowif13tFPIA9JmeQAhTQQFjy2q0nmUtjyiA8lgSISUd0RnkmSiFxOLHlQCAAdx5cAkPK7cGOPIGtB5OBHX1j2vjKZ9CaTGezeYLRYkJcT5cr1d2dYbTeorZ57c7Pb7A6HuEng3HvOg2HZ9PZuRADRMJFlUCSDQADFZvQALAArFYiogPSQA)).
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IDE:
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* Code actions on component syntax components will produce smaller targeted edits, rather than reprint the entire component.
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* Deprecated utility type like $Call are no longer suggested in autocomplete.
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* Flow will now provide a quick fix when the spread prop of a component with component syntax redefines some already defined props.
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Library Definitions:
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* `React.Ref` is marked as deprecated. Use `React.RefSetter` instead for ref props, and `React.RefObject` for returns of `useRef`.
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* `React.RefSetter` now includes null and void.
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* `Promise.all` and `Promise.allSettled` have been updated to use mapped type instead of `$TupleMap`. The requirement on the type arguments are slightly changed.
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### 0.245.2
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Misc:

Diff for: ‎flow_parser.opam

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opam-version: "2.0"
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name: "flow_parser"
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version: "0.245.2"
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version: "0.246.0"
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maintainer: "[email protected]"
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authors: ["Flow Team <[email protected]>"]
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homepage: "https://github.com/facebook/flow/tree/master/src/parser"

Diff for: ‎flowtype.opam

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opam-version: "2.0"
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name: "flowtype"
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version: "0.245.2"
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version: "0.246.0"
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maintainer: "[email protected]"
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authors: "Flow Team <[email protected]>"
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license: "MIT"
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"camlp-streams" {>= "5.0.1"}
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"dtoa" {>= "0.3.2"}
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"fileutils" {>= "0.6.4"}
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"flow_parser" {= "0.245.2"}
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"flow_parser" {= "0.246.0"}
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"inotify" {os = "linux" & >= "2.4.1"}
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"ounit2" {with-test}
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"lwt" {>= "5.7.0"}

Diff for: ‎packages/flow-parser-bin/package.json

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{
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"name": "flow-parser-bin",
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"version": "0.245.2",
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"version": "0.246.0",
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"description": "The Flow JavaScript parser, via bindings to the native OCaml implementation",
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"main": "index.js",
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"repository": "https://github.com/facebook/flow.git",

Diff for: ‎packages/flow-parser/package.json

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{
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"name": "flow-parser",
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"version": "0.245.2",
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"version": "0.246.0",
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"description": "JavaScript parser written in OCaml. Produces ESTree AST",
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"homepage": "https://flow.org",
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"license": "MIT",

Diff for: ‎packages/flow-remove-types/package.json

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{
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"name": "flow-remove-types",
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"version": "2.245.2",
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"version": "2.246.0",
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"description": "Removes Flow type annotations from JavaScript files with speed and simplicity.",
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"author": {
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"name": "Flow Team",

Diff for: ‎packages/try-flow-website-js/package.json

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{
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"name": "try-flow-website-js",
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"version": "0.245.2",
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"version": "0.246.0",
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"description": "An NPM package to hold compiled `flow.js` and libdefs for every Flow version.",
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"license": "MIT",
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"repository": "facebook/flow",

Diff for: ‎src/common/flow_version.ml

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* LICENSE file in the root directory of this source tree.
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*)
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let version = "0.245.2"
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let version = "0.246.0"

Diff for: ‎website/docs/install.md

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"name": "my-flow-project",
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"version": "1.0.0",
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"devDependencies": {
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"flow-bin": "^0.245.2"
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"flow-bin": "^0.246.0"
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},
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"scripts": {
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"flow": "flow"

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