refactor: Tag class support in registerTag()

src/context/block-mode.ts

@@ -1,8 +1,6 @@
-enum BlockMode {
+export enum BlockMode {
   /* store rendered html into blocks */
   OUTPUT,
   /* output rendered html directly */
   STORE
 }
-
-export default BlockMode

src/context/context.ts

@@ -2,9 +2,7 @@ import { Drop } from '../drop/drop'
 import { __assign } from 'tslib'
 import { NormalizedFullOptions, defaultOptions, RenderOptions } from '../liquid-options'
 import { Scope } from './scope'
-import { isArray, isNil, isString, isFunction, toLiquid } from '../util/underscore'
-import { InternalUndefinedVariableError } from '../util/error'
-import { toValueSync } from '../util/async'
+import { isArray, isNil, isString, isFunction, toLiquid, InternalUndefinedVariableError, toValueSync } from '../util'
 
 type PropertyKey = string | number;
 

src/context/index.ts

@@ -0,0 +1,3 @@
+export * from './context'
+export * from './scope'
+export * from './block-mode'

src/context/scope.ts

@@ -1,8 +1,7 @@
 import { Drop } from '../drop/drop'
 
-export interface PlainObject {
-  [key: string]: any;
+interface ScopeObject extends Record<string, any> {
   toLiquid?: () => any;
 }
 
-export type Scope = PlainObject | Drop
+export type Scope = ScopeObject | Drop