feat: support getter in provide/inject

README.md

@@ -257,24 +257,55 @@ As Vue-ECharts binds events to the ECharts instance by default, there is some ca
 
 ### Provide / Inject
 
-Vue-ECharts provides provide/inject API for `theme`, `init-options`, `update-options` and `loading-options` to help configuring contextual options. eg. for `init-options` you can use the provide API like this:
+Vue-ECharts provides provide/inject API for `theme`, `init-options`, `update-options` and `loading-options` to help configuring contextual options. eg. for `theme` you can use the provide API like this:
 
 <details>
-<summary>Vue 3</summary>
+<summary>Composition API</summary>
 
 ```js
 import { THEME_KEY } from 'vue-echarts'
 import { provide } from 'vue'
 
-// composition API
 provide(THEME_KEY, 'dark')
 
-// options API
+// or provide a reactive state
+const theme = ref('dark')
+provide(THEME_KEY, computed(() => theme.value))
+
+// getter is also supported
+provide(THEME_KEY, () => theme.value)
+```
+
+</details>
+
+<details>
+<summary>Options API</summary>
+
+```js
+import { THEME_KEY } from 'vue-echarts'
+import { computed } from 'vue'
+
+export default {
   {
     provide: {
       [THEME_KEY]: 'dark'
     }
   }
+}
+
+// Or make injections reactive
+export default {
+  data() {
+    return {
+      theme: 'dark'
+    }
+  },
+  provide() {
+    return {
+      [THEME_KEY]: computed(() => this.theme)
+    }
+  }
+}
 ```
 
 </details>

src/ECharts.ts

@@ -11,8 +11,7 @@ import {
   onBeforeUnmount,
   h,
   nextTick,
-  watchEffect,
+  watchEffect
-  unref
 } from "vue";
 import { init as initChart } from "echarts/core";
 
@@ -23,7 +22,7 @@ import {
   useLoading,
   loadingProps
 } from "./composables";
-import { isOn, omitOn } from "./utils";
+import { isOn, omitOn, toValue } from "./utils";
 import { register, TAG_NAME } from "./wc";
 
 import type { PropType, InjectionKey } from "vue";
@@ -82,12 +81,14 @@ export default defineComponent({
     const realOption = computed(
       () => manualOption.value || props.option || null
     );
-    const realTheme = computed(() => props.theme || unref(defaultTheme) || {});
+    const realTheme = computed(
+      () => props.theme || toValue(defaultTheme) || {}
+    );
     const realInitOptions = computed(
-      () => props.initOptions || unref(defaultInitOptions) || {}
+      () => props.initOptions || toValue(defaultInitOptions) || {}
     );
     const realUpdateOptions = computed(
-      () => props.updateOptions || unref(defaultUpdateOptions) || {}
+      () => props.updateOptions || toValue(defaultUpdateOptions) || {}
     );
     const nonEventAttrs = computed(() => omitOn(attrs));
     const nativeListeners: Record<string, unknown> = {};

src/composables/loading.ts

@@ -1,4 +1,5 @@
-import { inject, computed, watchEffect, unref } from "vue";
+import { inject, computed, watchEffect } from "vue";
+import { toValue } from "../utils";
 
 import type { Ref, InjectionKey, PropType } from "vue";
 import type { EChartsType, LoadingOptions } from "../types";
@@ -15,7 +16,7 @@ export function useLoading(
 ): void {
   const defaultLoadingOptions = inject(LOADING_OPTIONS_KEY, {});
   const realLoadingOptions = computed(() => ({
-    ...(unref(defaultLoadingOptions) || {}),
+    ...(toValue(defaultLoadingOptions) || {}),
     ...loadingOptions?.value
   }));
 

src/types.ts

@@ -1,9 +1,18 @@
 import { init } from "echarts/core";
 
 import type { SetOptionOpts, ECElementEvent, ElementEvent } from "echarts/core";
-import type { MaybeRef } from "vue";
+import type { Ref, ShallowRef, WritableComputedRef, ComputedRef } from "vue";
 
-export type Injection<T> = MaybeRef<T | null>;
+export type MaybeRef<T = any> =
+  | T
+  | Ref<T>
+  | ShallowRef<T>
+  | WritableComputedRef<T>;
+export type MaybeRefOrGetter<T = any> =
+  | MaybeRef<T>
+  | ComputedRef<T>
+  | (() => T);
+export type Injection<T> = MaybeRefOrGetter<T | null>;
 
 type InitType = typeof init;
 export type InitParameters = Parameters<InitType>;

src/utils.ts

@@ -1,3 +1,6 @@
+import type { MaybeRefOrGetter } from "./types";
+import { unref } from "vue";
+
 type Attrs = {
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   [key: string]: any;
@@ -18,3 +21,13 @@ export function omitOn(attrs: Attrs): Attrs {
 
   return result;
 }
+
+// Copied from
+// https://github.com/vuejs/core/blob/3cb4db21efa61852b0541475b4ddf57fdec4c479/packages/shared/src/general.ts#L49-L50
+const isFunction = (val: unknown): val is Function => typeof val === "function";
+
+// Copied from
+// https://github.com/vuejs/core/blob/3cb4db21efa61852b0541475b4ddf57fdec4c479/packages/reactivity/src/ref.ts#L246-L248
+export function toValue<T>(source: MaybeRefOrGetter<T>): T {
+  return isFunction(source) ? source() : unref(source);
+}