fix: support Context as evalValue parameter, #568

src/liquid.ts

@@ -76,15 +76,15 @@ export class Liquid {
     return this.renderToNodeStream(templates, scope, renderOptions)
   }
 
-  public _evalValue (str: string, scope?: object): IterableIterator<any> {
+  public _evalValue (str: string, scope?: object | Context): IterableIterator<any> {
     const value = new Value(str, this)
-    const ctx = new Context(scope, this.options)
+    const ctx = scope instanceof Context ? scope : new Context(scope, this.options)
     return value.value(ctx, false)
   }
-  public async evalValue (str: string, scope?: object): Promise<any> {
+  public async evalValue (str: string, scope?: object | Context): Promise<any> {
     return toPromise(this._evalValue(str, scope))
   }
-  public evalValueSync (str: string, scope?: object): any {
+  public evalValueSync (str: string, scope?: object | Context): any {
     return toValueSync(this._evalValue(str, scope))
   }
 

src/template/tag.ts

@@ -9,7 +9,7 @@ export type TagRenderReturn = Generator<unknown, unknown, unknown> | Promise<unk
 
 export abstract class Tag extends TemplateImpl<TagToken> implements Template {
   public name: string
-  protected liquid: Liquid
+  public liquid: Liquid
 
   public constructor (token: TagToken, remainTokens: TopLevelToken[], liquid: Liquid) {
     super(token)