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Author: 10xjs

.babelrc

@@ -11,6 +11,7 @@
   ],
   "plugins": [
     "@babel/plugin-proposal-class-properties",
-    "@babel/plugin-syntax-dynamic-import"
+    "@babel/plugin-syntax-dynamic-import",
+    "babel-plugin-dev-expression"
   ]
 }

.eslintrc

@@ -5,13 +5,22 @@ plugins:
   - prettier
 rules:
   complexity: 0
+  indent: 0
   jsx-quotes:
     - 2
     - prefer-double
   prettier/prettier: 2
+  max-len:
+    - 2
+    -
+      ignorePattern: '^#!'
   metalab/flowtype/space-after-type-colon: 0
+  metalab/react/prefer-stateless-function: 0
 overrides:
   -
     files: "*.test.js"
     env:
       jest: true
+globals:
+  __DEV__: false
+  module: false

.flowconfig

@@ -2,6 +2,7 @@
 0.67.1
 
 [include]
+<PROJECT_ROOT>/**/node_modules
 
 [lints]
 all=error
@@ -13,3 +14,4 @@ all=error
 emoji=true
 include_warnings=true
 suppress_comment=\\(.\\|\n\\)*\\$ExpectError
+module.ignore_non_literal_requires=true

example/index.js

@@ -0,0 +1,5 @@
+// @flow
+
+declare var __DEV__: boolean;
+
+declare var module: Object;

flow-typed/global.js

@@ -0,0 +1,319 @@
+// flow-typed signature: 1a33220ead1c6b6e3205a55b2a2ec3a0
+// flow-typed version: 18b7d8b101/koa_v2.x.x/flow_>=v0.47.x
+
+/*
+ * Type def from from source code of koa.
+ * this: https://github.com/koajs/koa/commit/08eb1a20c3975230aa1fe1c693b0cd1ac7a0752b
+ * previous: https://github.com/koajs/koa/commit/fabf5864c6a5dca0782b867a263b1b0825a05bf9
+ * 
+ * Changelog
+ * breaking: remove unused app.name
+ * breaking: ctx.throw([status], [msg], [properties]) (caused by http-errors (#957) )
+**/
+declare module 'koa' {
+  // Currently, import type doesnt work well ?
+  // so copy `Server` from flow/lib/node.js#L820
+  declare class Server extends net$Server {
+    listen(port?: number, hostname?: string, backlog?: number, callback?: Function): Server,
+    listen(path: string, callback?: Function): Server,
+    listen(handle: Object, callback?: Function): Server,
+    close(callback?: Function): Server,
+    maxHeadersCount: number,
+    setTimeout(msecs: number, callback: Function): Server,
+    timeout: number,
+  }
+  declare type ServerType = Server;
+
+  declare type JSON = | string | number | boolean | null | JSONObject | JSONArray;
+  declare type JSONObject = { [key: string]: JSON };
+  declare type JSONArray = Array<JSON>;
+
+  declare type SimpleHeader = {
+    'set-cookie'?: Array<string>,
+    [key: string]: string,
+  };
+
+  declare type RequestJSON = {
+    'method': string,
+    'url': string,
+    'header': SimpleHeader,
+  };
+  declare type RequestInspect = void|RequestJSON;
+  declare type Request = {
+    app: Application,
+    req: http$IncomingMessage,
+    res: http$ServerResponse,
+    ctx: Context,
+    response: Response,
+
+    fresh: boolean,
+    header: SimpleHeader,
+    headers: SimpleHeader, // alias as header
+    host: string,
+    hostname: string,
+    href: string,
+    idempotent: boolean,
+    ip: string,
+    ips: string[],
+    method: string,
+    origin: string,
+    originalUrl: string,
+    path: string,
+    protocol: string,
+    query: {[key: string]: string}, // always string
+    querystring: string,
+    search: string,
+    secure: boolean, // Shorthand for ctx.protocol == "https" to check if a request was issued via TLS.
+    socket: net$Socket,
+    stale: boolean,
+    subdomains: string[],
+    type: string,
+    url: string,
+
+    charset: string|void,
+    length: number|void,
+
+//  Those functions comes from https://github.com/jshttp/accepts/blob/master/index.js
+//  request.js$L445
+//  https://github.com/jshttp/accepts/blob/master/test/type.js
+    accepts: ((args: string[]) => string|false)&
+    // ToDo: There is an issue https://github.com/facebook/flow/issues/3009
+    // if you meet some error here, temporarily add an additional annotation
+    // like: `request.accepts((['json', 'text']:Array<string>))` to fix it.
+    ((arg: string, ...args: string[]) => string|false) &
+    ( () => string[] ) , // return the old value.
+
+//  https://github.com/jshttp/accepts/blob/master/index.js#L153
+//  https://github.com/jshttp/accepts/blob/master/test/charset.js
+    acceptsCharsets: ( (args: string[]) => buffer$Encoding|false)&
+    // ToDo: https://github.com/facebook/flow/issues/3009
+    // if you meet some error here, see L70.
+    ( (arg: string, ...args: string[]) => buffer$Encoding|false ) &
+    ( () => string[] ),
+
+//  https://github.com/jshttp/accepts/blob/master/index.js#L119
+//  https://github.com/jshttp/accepts/blob/master/test/encoding.js
+    acceptsEncodings: ( (args: string[]) => string|false)&
+    // ToDo: https://github.com/facebook/flow/issues/3009
+    // if you meet some error here, see L70.
+    ( (arg: string, ...args: string[]) => string|false ) &
+    ( () => string[] ),
+
+//  https://github.com/jshttp/accepts/blob/master/index.js#L185
+//  https://github.com/jshttp/accepts/blob/master/test/language.js
+    acceptsLanguages: ( (args: string[]) => string|false) &
+    // ToDo: https://github.com/facebook/flow/issues/3009
+    // if you meet some error here, see L70.
+    ( (arg: string, ...args: string[]) => string|false ) &
+    ( () => string[] ),
+
+    get: (field: string) => string,
+
+/* https://github.com/jshttp/type-is/blob/master/test/test.js
+* Check if the incoming request contains the "Content-Type"
+* header field, and it contains any of the give mime `type`s.
+* If there is no request body, `null` is returned.
+* If there is no content type, `false` is returned.
+* Otherwise, it returns the first `type` that matches.
+*/
+    is: ( (args: string[]) => null|false|string)&
+    ( (arg: string, ...args: string[]) => null|false|string ) &
+    ( () => string ), // should return the mime type
+
+    toJSON: () => RequestJSON,
+    inspect: () => RequestInspect,
+
+    [key: string]: mixed, // props added by middlewares.
+  };
+
+  declare type ResponseJSON = {
+    'status': mixed,
+    'message': mixed,
+    'header': mixed,
+  };
+  declare type ResponseInspect = {
+    'status': mixed,
+    'message': mixed,
+    'header': mixed,
+    'body': mixed,
+  };
+  declare type Response = {
+    app: Application,
+    req: http$IncomingMessage,
+    res: http$ServerResponse,
+    ctx: Context,
+    request: Request,
+
+    // docs/api/response.md#L113.
+    body: string|Buffer|stream$Stream|Object|Array<mixed>|null, // JSON contains null
+    etag: string,
+    header: SimpleHeader,
+    headers: SimpleHeader, // alias as header
+    headerSent: boolean,
+    // can be set with string|Date, but get with Date.
+    // set lastModified(v: string|Date), // 0.36 doesn't support this.
+    lastModified: Date,
+    message: string,
+    socket: net$Socket,
+    status: number,
+    type: string,
+    writable: boolean,
+
+    // charset: string,  // doesn't find in response.js
+    length: number|void,
+
+    append: (field: string, val: string | string[]) => void,
+    attachment: (filename?: string) => void,
+    get: (field: string) => string,
+    // https://github.com/jshttp/type-is/blob/master/test/test.js
+    // https://github.com/koajs/koa/blob/v2.x/lib/response.js#L382
+    is: ( (arg: string[]) => false|string) &
+    ( (arg: string, ...args: string[]) => false|string ) &
+    ( () => string ), // should return the mime type
+    redirect: (url: string, alt?: string) => void,
+    remove: (field: string) => void,
+    // https://github.com/koajs/koa/blob/v2.x/lib/response.js#L418
+    set: ((field: string, val: string | string[]) => void)&
+      ((field: {[key: string]: string | string[]}) => void),
+
+    vary: (field: string) => void,
+
+    // https://github.com/koajs/koa/blob/v2.x/lib/response.js#L519
+    toJSON(): ResponseJSON,
+    inspect(): ResponseInspect,
+
+    [key: string]: mixed, // props added by middlewares.
+  }
+
+  declare type ContextJSON = {
+    request: RequestJSON,
+    response: ResponseJSON,
+    app: ApplicationJSON,
+    originalUrl: string,
+    req: '<original node req>',
+    res: '<original node res>',
+    socket: '<original node socket>',
+  };
+  // https://github.com/pillarjs/cookies
+  declare type CookiesSetOptions = {
+    maxAge: number, // milliseconds from Date.now() for expiry
+    expires: Date, //cookie's expiration date (expires at the end of session by default).
+    path: string, //  the path of the cookie (/ by default).
+    domain: string, // domain of the cookie (no default).
+    secure: boolean, // false by default for HTTP, true by default for HTTPS
+    httpOnly: boolean, //  a boolean indicating whether the cookie is only to be sent over HTTP(S),
+    // and not made available to client JavaScript (true by default).
+    signed: boolean, // whether the cookie is to be signed (false by default)
+    overwrite: boolean, //  whether to overwrite previously set cookies of the same name (false by default).
+  };
+  declare type Cookies = {
+    get: (name: string, options?: {signed: boolean}) => string|void,
+    set: ((name: string, value: string, options?: CookiesSetOptions) => Context)&
+    // delete cookie (an outbound header with an expired date is used.)
+    ( (name: string) => Context),
+  };
+  // The default props of context come from two files
+  // `application.createContext` & `context.js`
+  declare type Context = {
+    accept: $PropertyType<Request, 'accept'>,
+    app: Application,
+    cookies: Cookies,
+    name?: string, // ?
+    originalUrl: string,
+    req: http$IncomingMessage,
+    request: Request,
+    res: http$ServerResponse,
+    respond?: boolean, // should not be used, allow bypassing koa application.js#L193
+    response: Response,
+    state: Object,
+
+    // context.js#L55
+    assert: (test: mixed, status: number, message?: string, opts?: mixed) => void,
+    // context.js#L107
+    // if (!(err instanceof Error)) err = new Error(`non-error thrown: ${err}`);
+    onerror: (err?: mixed) => void,
+    // context.md#L88
+    throw: ( status: number, msg?: string, opts?: Object) => void,
+    toJSON(): ContextJSON,
+    inspect(): ContextJSON,
+
+    // ToDo: add const for some props,
+    // while the `const props` feature of Flow is landing in future
+    // cherry pick from response
+    attachment: $PropertyType<Response, 'attachment'>,
+    redirect: $PropertyType<Response, 'redirect'>,
+    remove: $PropertyType<Response, 'remove'>,
+    vary: $PropertyType<Response, 'vary'>,
+    set: $PropertyType<Response, 'set'>,
+    append: $PropertyType<Response, 'append'>,
+    flushHeaders: $PropertyType<Response, 'flushHeaders'>,
+    status: $PropertyType<Response, 'status'>,
+    message: $PropertyType<Response, 'message'>,
+    body: $PropertyType<Response, 'body'>,
+    length: $PropertyType<Response, 'length'>,
+    type: $PropertyType<Response, 'type'>,
+    lastModified: $PropertyType<Response, 'lastModified'>,
+    etag: $PropertyType<Response, 'etag'>,
+    headerSent: $PropertyType<Response, 'headerSent'>,
+    writable: $PropertyType<Response, 'writable'>,
+
+    // cherry pick from request
+    acceptsLanguages: $PropertyType<Request, 'acceptsLanguages'>,
+    acceptsEncodings: $PropertyType<Request, 'acceptsEncodings'>,
+    acceptsCharsets: $PropertyType<Request, 'acceptsCharsets'>,
+    accepts: $PropertyType<Request, 'accepts'>,
+    get: $PropertyType<Request, 'get'>,
+    is: $PropertyType<Request, 'is'>,
+    querystring: $PropertyType<Request, 'querystring'>,
+    idempotent: $PropertyType<Request, 'idempotent'>,
+    socket: $PropertyType<Request, 'socket'>,
+    search: $PropertyType<Request, 'search'>,
+    method: $PropertyType<Request, 'method'>,
+    query: $PropertyType<Request, 'query'>,
+    path: $PropertyType<Request, 'path'>,
+    url: $PropertyType<Request, 'url'>,
+    origin: $PropertyType<Request, 'origin'>,
+    href: $PropertyType<Request, 'href'>,
+    subdomains: $PropertyType<Request, 'subdomains'>,
+    protocol: $PropertyType<Request, 'protocol'>,
+    host: $PropertyType<Request, 'host'>,
+    hostname: $PropertyType<Request, 'hostname'>,
+    header: $PropertyType<Request, 'header'>,
+    headers: $PropertyType<Request, 'headers'>,
+    secure: $PropertyType<Request, 'secure'>,
+    stale: $PropertyType<Request, 'stale'>,
+    fresh: $PropertyType<Request, 'fresh'>,
+    ips: $PropertyType<Request, 'ips'>,
+    ip: $PropertyType<Request, 'ip'>,
+
+    [key: string]: any, // props added by middlewares.
+  }
+
+  declare type Middleware =
+    (ctx: Context, next: () => Promise<void>) => Promise<void>|void;
+  declare type ApplicationJSON = {
+    'subdomainOffset': mixed,
+    'proxy': mixed,
+    'env': string,
+  };
+  declare class Application extends events$EventEmitter {
+    context: Context,
+    // request handler for node's native http server.
+    callback: () => (req: http$IncomingMessage, res: http$ServerResponse) => void,
+    env: string,
+    keys?: Array<string>|Object, // https://github.com/crypto-utils/keygrip
+    middleware: Array<Middleware>,
+    proxy: boolean, // when true proxy header fields will be trusted
+    request: Request,
+    response: Response,
+    server: Server,
+    subdomainOffset: number,
+
+    listen: $PropertyType<Server, 'listen'>,
+    toJSON(): ApplicationJSON,
+    inspect(): ApplicationJSON,
+    use(fn: Middleware): this,
+  }
+
+  declare module.exports: Class<Application>;
+}