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    0.7.0 • Public • Published


    Babel plugin to convert Flow code into TypeScript

    How to use

    $ yarn global add @babel/cli
    $ yarn add @steelbrain/babel-plugin-flow-to-typescript
    # you must use babel@^7.x.x
    $ babel --version
    7.0.0-beta.44 (@babel/core 7.0.0-beta.44)
    $ babel --plugins @steelbrain/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
    Object type Object object
    Mixed type mixed unknown
    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
    Type alias type A = string type A = string
    Flow Ignore $FlowFixMe any
    Interfaces interface X { +prop: string } interface X { readonly prop: string }
    Optional Members a?.b a == null ? null : a.b == null ? null : a.b
    Declare functions declare function x(false): true; function x(x0: false): true;


    npm i @steelbrain/babel-plugin-flow-to-typescript

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    • steelbrain