README
@voxylu/babel-plugin-flow-to-typescript
Babel plugin to convert Flow code into TypeScript
How to use
$ yarn add @babel/cli @babel/core
$ yarn add @voxylu/babel-plugin-flow-to-typescript
# you must use babel@^7.x.x
$ yarn babel --version
7.2.3 (@babel/core 7.2.2)
$ yarn babel --plugins @voxylu/babel-plugin-flow-to-typescript ${SRC_FLOW_FILE} -o ${DEST_TS_FILE}
Implementation status
| Supported? | Syntax | Flow | TypeScript |
|---|---|---|---|
| ❎ | Maybe type | let a:?number |
let a: number \| null \| undefined |
| ❎ | Void type | void |
void |
| ❎ | Mixed type | mixed |
{} |
| ❎ | Function type | (A, B) => C |
(x1: A, x2: B) => C |
| ❎ | Exact type | {\| a: A \|} |
{ a: A } |
| ❎ | Indexers | { [A]: B } |
{ [a: A]: B } |
| ❎ | Existential type | Map<*, *> |
Map<any, any> |
| ❎ | Opaque types | opaque type A = B |
type A = B |
| ❎ | Variance | interface A { +b: B, -c: C } |
interface A { readonly b: B, c: C } |
| ❎ | Type parameter bounds | function f<A: string>(a:A){} |
function f<A extends string>(a:A){} |
| ❎ | Cast | (a: A) |
(a as A) |
| ❎ | type/typeof import | import type A from 'module' |
import A from 'module' |
| ❎ | $Keys | $Keys<X> |
keyof X |
| ❎ | $Values | $Values<X> |
X[keyof X] |
| ❎ | $ReadOnly | $Readonly<X> |
Readonly<X> |
| ❎ | $Exact | $Exact<X> |
X |
| ❎ | $Diff | $Diff<X, Y> |
Pick<X, Exclude<keyof X, keyof Y>> |
| ❎ | $PropertyType | $PropertyType<T, k> |
T[k] |
| ❎ | $ElementType | $ElementType<T, k> |
T[k] |
| ❎ | typeof operator | typeof foo |
typeof foo |
| ❎ | JSX | - | - |
| ❎ | Tuple type | [number, string] |
[number, string] |
| ❎ | Exact type | {|a: T|} |
{a: T} |
| ❎ | Type alias | type A = string |
type A = string |