2 files changed, 49 insertions, 10 deletions

diff --git a/shared/core-utils/common/number.ts b/shared/core-utils/common/number.ts
index 9a96dcf5c..ce5a6041a 100644
--- a/shared/core-utils/common/number.ts
+++ b/shared/core-utils/common/number.ts
@@ -1,7 +1,13 @@
-function forceNumber (value: any) {
+export function forceNumber (value: any) {
   return parseInt(value + '')
 }
 
-export {
-  forceNumber
+export function isOdd (num: number) {
+  return (num % 2) !== 0
+}
+
+export function toEven (num: number) {
+  if (isOdd(num)) return num + 1
+
+  return num
 }
diff --git a/shared/core-utils/common/promises.ts b/shared/core-utils/common/promises.ts
index f17221b97..e3792d12e 100644
--- a/shared/core-utils/common/promises.ts
+++ b/shared/core-utils/common/promises.ts
@@ -1,12 +1,12 @@
-function isPromise <T = unknown> (value: T | Promise<T>): value is Promise<T> {
+export function isPromise <T = unknown> (value: T | Promise<T>): value is Promise<T> {
   return value && typeof (value as Promise<T>).then === 'function'
 }
 
-function isCatchable (value: any) {
+export function isCatchable (value: any) {
   return value && typeof value.catch === 'function'
 }
 
-function timeoutPromise <T> (promise: Promise<T>, timeoutMs: number) {
+export function timeoutPromise <T> (promise: Promise<T>, timeoutMs: number) {
   let timer: ReturnType<typeof setTimeout>
 
   return Promise.race([
@@ -18,8 +18,41 @@ function timeoutPromise <T> (promise: Promise<T>, timeoutMs: number) {
   ]).finally(() => clearTimeout(timer))
 }
 
-export {
-  isPromise,
-  isCatchable,
-  timeoutPromise
+export 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) => {
+      // eslint-disable-next-line no-useless-call
+      func.apply(null, [ (err: any, res: A) => err ? reject(err) : resolve(res) ])
+    })
+  }
+}
+
+// Thanks to https://gist.github.com/kumasento/617daa7e46f13ecdd9b2
+export 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) => {
+      // eslint-disable-next-line no-useless-call
+      func.apply(null, [ arg, (err: any, res: A) => err ? reject(err) : resolve(res) ])
+    })
+  }
+}
+
+// eslint-disable-next-line max-len
+export 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) => {
+      // eslint-disable-next-line no-useless-call
+      func.apply(null, [ arg1, arg2, (err: any, res: A) => err ? reject(err) : resolve(res) ])
+    })
+  }
+}
+
+// eslint-disable-next-line max-len
+export function promisify3<T, U, V, A> (func: (arg1: T, arg2: U, arg3: V, cb: (err: any, result: A) => void) => void): (arg1: T, arg2: U, arg3: V) => Promise<A> {
+  return function promisified (arg1: T, arg2: U, arg3: V): Promise<A> {
+    return new Promise<A>((resolve: (arg: A) => void, reject: (err: any) => void) => {
+      // eslint-disable-next-line no-useless-call
+      func.apply(null, [ arg1, arg2, arg3, (err: any, res: A) => err ? reject(err) : resolve(res) ])
+    })
+  }
 }