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v0.261.0
Reviewed By: alexmckenley Differential Revision: D69534638 fbshipit-source-id: ed45a6fd2c3db756164733f7446b686af394f80c
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‎Changelog.md

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### 0.261.0
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New Features:
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* Bigint values inside of template literals now coerce to strings, e.g. ``` `${1n}` ```. Addition with string (e.g. `1n + 'blah'`) is still banned.
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* Add ability to resolve node package entrypoints/exports
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* Flow now allows inference of type guards for simple expression arrow functions with one parameter. For example, in `["a", null].filter(s => s != null)` it will automatically infer that the arrow function encodes a `x is string` type guard and will apply it on the input array resulting in a`Array<string>`. ([try-Flow](https://flow.org/try/#1N4Igxg9gdgZglgcxALlAIwIZoKYBsD6uEEAztvhgE6UYCe+JADpdhgCYowa5kA0I2KAFcAtiRQAXSkOz9sADwxgJ+NPTbYuQ3BMnTZA+Y2yU4IwRO4A6SFBIrGVDGM7c+h46fNRLuKxJIGWh8MeT0ZfhYlCStpHzNsFBAMIQkIEQwJODAQfiEyfBE4eWw2fDgofDBMsAALfAA3KjgsXGxxZC4eAw0G-GhcWn9aY3wWZldu-g1mbGqJUoBaCRHEzrcDEgBrbAk62kXhXFxJ923d-cPRHEpTgyEoMDaqZdW7vKgoOfaSKgOKpqmDA+d4gB5fMA-P6LCCMLLQbiLOoYCqgh6-GDYRYIXYLSgkRZkCR4jpddwPfJLZjpOBkO4AX34kA0SQAOhJWY9oPYAATyHkAXh5AG1WckxbweUdcABdKzwHQmAAUJEFAD4eaqAIRC6UASgA3Jz+RhVQBBah0AA89lMUAQaoNPIA9M6eQB3ODHKUQd08nA8iBbOic3IgBomEhwaBJBoABisACYAKwATisAEYQPSgA))
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* `module.system.node.root_relative_dirname` will allow conditional mapping like `module.system.node.root_relative_dirname='<PROJECT_ROOT>/foo' -> 'bar'`. Under such config, `import 'a'` will only be resolved to `<PROJECT_ROOT>/bar/a` if `import 'a'` is in a file in the `<PROJECT_ROOT>/foo` directory. This feature will be helpful if you want to combine two flow roots with different `module.system.node.root_relative_dirname` config.
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Likely to cause new Flow errors:
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* When an opaque type is refined to be not null/undefined, we now refine the opaque type's upper bound rather than returning the opaque type unmodified.
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Notable bug fixes:
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* Flow will error more consistently on incompatible uses of refined string, number and boolean literal types (e.g. [try-Flow](https://flow.org/try/#1N4Igxg9gdgZglgcxALlAIwIZoKYBsD6uEEAztvhgE6UYCe+JADpdhgCYowa5kA0I2KAFcAtiRQAXSkOz9sADwxgJ+NPTbYuQ3BMnTZA+Y2yU4IwRO4A6SFBIrGVDGM7c+h46fNRLuKxJIGWh8MeT0ZfhYlCStpHzNsFBAMIQkIEQwJODAQfiEyfBE4eWw2fDgofDBMsAALfAA3KjgsXGxxZC4eAw0G-GhcWn9aY3wWZldu-g1mbGqJUoBaCRHEzrcDEgBrbAk62kXhXFxJ923d-cPRHEpTgyEoMDaqZdW7vKgoOfaSKgOKpqmDA+d4gB5fMA-P6LCCMLLQbiLOoYCqgh6-GDYRYIXYLSgkRZkCR4jpddwPfJLZjpOBkO4AX34kA0SQAOrAHso4NAAAQLewARgAFBlaDgAMpSZA8gD8AHIMHKAJQ84Dsnk8uAwHkiugSqQ8gCEAF4eUdcCq1VANRqFXKeRgSHzVhBtaL9ZQANw8gD0Pp5EC26ptfp57uwksoPNNwdtaHtjudxldYb1Eak3tDAHc4MczRAszyTJQIFHi6WeXL4zyAH4APkriuD9PZLag7JgnPh1v5EgATEKMNK7bweWhh-HLcG2hIefJow7ZTKx572cGhUKVcaG1abTySDm9rUdfIp9abdUyGPkLGbfPTXKwHLM-6AOq53D5wvlqMkCqQvlamwTVYGLUok2AmAK3nHM8xwRt7QAH0reNbw1NAoi2Vdzw1NtcKVTdsODedEztHlkKrZ9W1yEAGhMP9oCSBoAAYrD7ABWABOKwBRAekgA))
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* Fixed some cases of type filtering during type guard refinement (e.g. [try-Flow](https://flow.org/try/#1N4Igxg9gdgZglgcxALlAIwIZoKYBsD6uEEAztvhgE6UYCe+JADpdhgCYowa5kA0I2KAFcAtiRQAXSkOz9sADwxgJ+NPTbYuQ3BMnTZA+Y2yU4IwRO4A6SFBIrGVDGM7c+h46fNRLuKxJIGWh8MeT0ZfhYlCStpHzNsFBAMIQkIEQwJODAQfiEyfBE4eWw2fDgofDBMsAALfAA3KjgsXGxxZC4eAw0G-GhcWn9aY3wWZldu-g1mbGqJUoBaCRHEzrcDEgBrbAk62kXhXFxJ923d-cPRHEpTgyEoMDaqZdW7vKgoOfaSKgOKpqmDA+d4gB5fMA-P6LCCMLLQbiLOoYCqgh6-GDYRYIXYLSgkRZkCR4jpddwPfJLZjpOBkO4AX34kA0SQAOhJWVANE8qNgAAQwB7KODQPm0gCCEEoACEABTyZB8gDkGCVAB8lWh1UqwEqAJSK+RikjK1V8tXKrUAbk5nO5uF5fMBfIVpu1uptUDgMD5solUrl8j1er5wE5fJdfIwJpVSqtfIA9Am+QB1ODHPlQCAAdz5OD5EC2dHDkejlrjieTJkoUrdfIAfgA+cslo1lnUVpN86u12MN5sdzn03IgBomEgiqBJBoABisACYAKwATisAEYQPSgA))
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* Fixed a bug of missing errors when certain functions were checked against interfaces (e.g. [try-Flow](https://flow.org/try/#1N4Igxg9gdgZglgcxALlAIwIZoKYBsD6uEEAztvhgE6UYCe+JADpdhgCYowa5kA0I2KAFcAtiRQAXSkOz9sADwxgJ+NPTbYuQ3BMnTZA+Y2yU4IwRO4A6SFBIrGVDGM7c+h46fNRLuKxJIGWh8MeT0ZfhYlCStpHzNsFBAMIQkIEQwJODAQfiEyfBE4eWw2fDgofDBMsAALfAA3KjgsXGxxZC4eAw0G-GhcWn9aY3wWZldu-g1mbGqJUoBaCRHEzrcDEgBrbAk62kXhXFxJ923d-cPRHEpTgyEoMDaqZdW7vKgoOfaSKgOKpqmDA+d4gB5fMA-P6LCCMLLQbiLOoYCqgh6-GDYRYIXYLSgkRZkCR4jpddwPfJLZjpOBkO4AX34kA0SSeGBIJAABABlTnAAA6UE5nPsmWynLQQjguDYAAoAJTIHl8wXC4UsCRCShCr4Adx5CoA3KrOfTBWaoILbPYJVKZZyALw8qyS6VsY1QWWumVKip4riQvn0+WGzkAejDnIA8gBpQVeu1sX0+EwB7B8mDEJVoYjPKDB0MRzkAdWluE5UAg+oAogAlWtR2u5EANEwkODQJINAAMVgATABWACcVgAjCB6UA))
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* Fixed negation of refinement of type-guard functions with multiple parameters (e.g. [try-Flow](https://flow.org/try/#1N4Igxg9gdgZglgcxALlAIwIZoKYBsD6uEEAztvhgE6UYCe+JADpdhgCYowa5kA0I2KAFcAtiRQAXSkOz9sADwxgJ+NPTbYuQ3BMnTZA+Y2yU4IwRO4A6SFBIrGVDGM7c+h46fNRLuKxJIGWh8MeT0ZfhYlCStpHzNsFBAMIQkIEQwJODAQfiEyfBE4eWw2fDgofDBMsAALfAA3KjgsXGxxZC4eAw0G-GhcWn9aY3wWZldu-g1mbGqJUoBaCRHEzrcDEgBrbAk62kXhXFxJ923d-cPRHEpTgyEoMDaqZdW7vKgoOfaSKgOKpqmDA+d4gB5fMA-P6LCCMLLQbiLOoYCqgh6-GDYRYIXYLSgkRZkCR4jpddwPfJLZjpOBkO4AX34kA0SQABKyNE8qNhWYDWbSAGL2AAKThEADlRMhWQAKJq4GTSoolNi8VkKKQYRrcRWs5WlACUrIAvAA+Xk6nm01nCEQ3ADcAB0oM6YA9lHBoKyYMQZfJpbabqyAD6s+ymKAINW0APXEwhsNSCoII3AZ3O9lwGCywUisWSkR+6MG1MZ9mslgSISUKBOqDs+ll+SsjAkRMRhD21kAem7rIA7nBjjaIP3WThWRAtnR01BG1BciAGiYSJ6F8glwAGKwAJgArABOKwARhA9KAA))
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* Relaxed type-guard consistency checks when the function returns with `true` or `false`. (e.g. [try-Flow](https://flow.org/try/#1N4Igxg9gdgZglgcxALlAIwIZoKYBsD6uEEAztvhgE6UYCe+JADpdhgCYowa5kA0I2KAFcAtiRQAXSkOz9sADwxgJ+NPTbYuQ3BMnTZA+Y2yU4IwRO4A6SFBIrGVDGM7c+h46fNRLuKxJIGWh8MeT0ZfhYlCStpHzNsFBAMIQkIEQwJODAQfiEyfBE4eWw2fDgofDBMsAALfAA3KjgsXGxxZC4eAw0G-GhcWn9aY3wWZldu-g1mbGqJUoBaCRHEzrcDEgBrbAk62kXhXFxJ923d-cPRHEpTgyEoMDaqZdW7vKgoOfaSKgOKpqmDA+d4gB5fMA-P6LCCMLLQbiLOoYCqgh6-GDYRYIXYLSgkRZkCR4jpddwPfJLZjpOBkO4AX34kA0SRgD2UcGgAAIWBIhJRKmTyA8NJQqtA2HB4VAABTyZBc4QiG5cgA+XPspigCDVXLQxGeUAAlAr5FzaXqDawoFzgAAdG3mmBcmUrYwQZ1mgC8Pq5AHIlTc-UbbQ6ueGebt+TahQBuLkAegTiogEi5wK5JkoEEo6agtC5Ihz2DDXPpme6TpdbuwHq53p9fs1FQQwdDjvDvOjXLjieTUFTecz1BzeYLRZYpfLeDI7Yjkb5Aq5Uhk8aTKbTGazo+B4+LU4d9NyIAaJhInKgSQaAAYrAAmACsAE4rABGED0oA))
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Parser:
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* We now provide parsing support for `declare global {...}` (using it will still result in an error). The AST will have the shape of
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```
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{
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"type":"DeclareNamespace",
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"loc": ...,
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"range": ...,
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"global":true,
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"id":{
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"type":"Identifier",
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"loc": ...,
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"range":...,
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"name":"global",
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"typeAnnotation":null,
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"optional":false
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},
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"body":{
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"type":"BlockStatement",
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...
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},
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}
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```
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Library Definitions:
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* The global `React$PureComponent` is removed. If you want to refer to it, it needs to be imported from `react`.
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### 0.260.0
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New Features:

‎flow_parser.opam

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opam-version: "2.0"
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name: "flow_parser"
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version: "0.260.0"
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version: "0.261.0"
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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"

‎flowtype.opam

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opam-version: "2.0"
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name: "flowtype"
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version: "0.260.0"
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version: "0.261.0"
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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" {= "0.260.0"}
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"flow_parser" {= "0.261.0"}
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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"}

‎packages/flow-parser-bin/package.json

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{
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"name": "flow-parser-bin",
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"version": "0.260.0",
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"version": "0.261.0",
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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",

‎packages/flow-parser/package.json

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{
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"name": "flow-parser",
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"version": "0.260.0",
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"version": "0.261.0",
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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",

‎packages/flow-remove-types/package.json

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{
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"name": "flow-remove-types",
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"version": "2.260.0",
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"version": "2.261.0",
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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",

‎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": "0.260.0",
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"version": "0.261.0",
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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",

‎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 = "0.260.0"
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let version = "0.261.0"

‎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": "^0.260.0"
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"flow-bin": "^0.261.0"
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},
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"scripts": {
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"flow": "flow"

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