+ // We are in /helpers/utils.js
+ const paths = [ __dirname, '..', '..' ]
+
+ // We are under /dist directory
+ if (process.mainModule.filename.endsWith('.ts') === false) {
+ paths.push('..')
+ }
+
+ return join.apply(null, paths)
+}
+
+function promisify0<A> (func: (cb: (err: any, result: A) => void) => void): () => Promise<A> {
+ return function promisified (): Promise<A> {
+ return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
+ func.apply(null, [ (err: any, res: A) => err ? reject(err) : resolve(res) ])
+ })
+ }
+}
+
+// Thanks to https://gist.github.com/kumasento/617daa7e46f13ecdd9b2
+function promisify1<T, A> (func: (arg: T, cb: (err: any, result: A) => void) => void): (arg: T) => Promise<A> {
+ return function promisified (arg: T): Promise<A> {
+ return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
+ func.apply(null, [ arg, (err: any, res: A) => err ? reject(err) : resolve(res) ])
+ })
+ }
+}
+
+function promisify1WithVoid<T> (func: (arg: T, cb: (err: any) => void) => void): (arg: T) => Promise<void> {
+ return function promisified (arg: T): Promise<void> {
+ return new Promise<void>((resolve: () => void, reject: (err: any) => void) => {
+ func.apply(null, [ arg, (err: any) => err ? reject(err) : resolve() ])
+ })
+ }
+}
+
+function promisify2<T, U, A> (func: (arg1: T, arg2: U, cb: (err: any, result: A) => void) => void): (arg1: T, arg2: U) => Promise<A> {
+ return function promisified (arg1: T, arg2: U): Promise<A> {
+ return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
+ func.apply(null, [ arg1, arg2, (err: any, res: A) => err ? reject(err) : resolve(res) ])
+ })
+ }