feat(and,or,not): new functions (#459)

packages/shared/and/index.md

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+---
+category: Utilities
+---
+
+# and
+
+`AND` condition for refs.
+
+## Usage
+
+```ts
+import { and } from '@vueuse/core'
+
+const a = ref(true)
+const b = ref(false)
+
+whenever(and(a, b), () => {
+  console.log('both a and b are now truthy!')
+})
+```
+
+## Related Functions
+
+- `or`
+- `not`
+- `whenever`
+
+<!--FOOTER_STARTS-->
+## Type Declarations
+
+```typescript
+export declare function set<T>(ref: Ref<T>, value: T): void
+export declare function set<O extends object, K extends keyof O>(
+  target: O,
+  key: K,
+  value: O[K]
+): void
+```
+
+## Source
+
+[Source](https://github.com/vueuse/vueuse/blob/main/packages/shared/set/index.ts) • [Docs](https://github.com/vueuse/vueuse/blob/main/packages/shared/set/index.md)
+
+
+<!--FOOTER_ENDS-->

packages/shared/and/index.ts

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+import { MaybeRef } from '../utils'
+import { computed, ComputedRef, unref } from 'vue-demi'
+
+/**
+ * `AND` conditions for refs.
+ *
+ * @link https://vueuse.org/and
+ */
+export function and(...args: MaybeRef<any>[]): ComputedRef<boolean> {
+  return computed(() => args.every(i => unref(i)))
+}

packages/shared/not/index.md

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+---
+category: Utilities
+---
+
+# not
+
+`NOT` condition for ref.
+
+## Usage
+
+```ts
+import { not } from '@vueuse/core'
+
+const a = ref(true)
+
+whenever(not(a), () => {
+  console.log('a is now falsy!')
+})
+```
+
+## Related Functions
+
+- `and`
+- `or`
+- `whenever`
+
+<!--FOOTER_STARTS-->
+## Type Declarations
+
+```typescript
+export declare function set<T>(ref: Ref<T>, value: T): void
+export declare function set<O extends object, K extends keyof O>(
+  target: O,
+  key: K,
+  value: O[K]
+): void
+```
+
+## Source
+
+[Source](https://github.com/vueuse/vueuse/blob/main/packages/shared/set/index.ts) • [Docs](https://github.com/vueuse/vueuse/blob/main/packages/shared/set/index.md)
+
+
+<!--FOOTER_ENDS-->

packages/shared/not/index.ts

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+import { MaybeRef } from '../utils'
+import { computed, ComputedRef, unref } from 'vue-demi'
+
+/**
+ * `NOT` conditions for refs.
+ *
+ * @link https://vueuse.org/not
+ */
+export function not(v: MaybeRef<any>): ComputedRef<boolean> {
+  return computed(() => !unref(v))
+}

packages/shared/or/index.md

@@ -0,0 +1,45 @@
+---
+category: Utilities
+---
+
+# and
+
+`OR` conditions for refs.
+
+## Usage
+
+```ts
+import { or } from '@vueuse/core'
+
+const a = ref(true)
+const b = ref(false)
+
+whenever(or(a, b), () => {
+  console.log('either a or b is truthy!')
+})
+```
+
+## Related Functions
+
+- `and`
+- `not`
+- `whenever`
+
+<!--FOOTER_STARTS-->
+## Type Declarations
+
+```typescript
+export declare function set<T>(ref: Ref<T>, value: T): void
+export declare function set<O extends object, K extends keyof O>(
+  target: O,
+  key: K,
+  value: O[K]
+): void
+```
+
+## Source
+
+[Source](https://github.com/vueuse/vueuse/blob/main/packages/shared/set/index.ts) • [Docs](https://github.com/vueuse/vueuse/blob/main/packages/shared/set/index.md)
+
+
+<!--FOOTER_ENDS-->

packages/shared/or/index.ts

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+import { MaybeRef } from '../utils'
+import { computed, ComputedRef, unref } from 'vue-demi'
+
+/**
+ * `OR` conditions for refs.
+ *
+ * @link https://vueuse.org/or
+ */
+export function or(...args: MaybeRef<any>[]): ComputedRef<boolean> {
+  return computed(() => args.some(i => unref(i)))
+}