fix: add way to cancel inputrules and pasterules (#2368)

Co-authored-by: Philipp Kühn <philippkuehn@MacBook-Pro-von-Philipp.local>

packages/core/src/InputRule.ts

@@ -1,4 +1,9 @@
-import { EditorState, Plugin, TextSelection } from 'prosemirror-state'
+import {
+  EditorState,
+  Plugin,
+  TextSelection,
+  Transaction,
+} from 'prosemirror-state'
 import { Editor } from './Editor'
 import { CommandManager } from './CommandManager'
 import { createChainableState } from './helpers/createChainableState'
@@ -33,7 +38,7 @@ export class InputRule {
     commands: SingleCommands,
     chain: () => ChainedCommands,
     can: () => CanCommands,
-  }) => void
+  }) => Transaction | null
 
   constructor(config: {
     find: InputRuleFinder,
@@ -44,7 +49,7 @@ export class InputRule {
       commands: SingleCommands,
       chain: () => ChainedCommands,
       can: () => CanCommands,
-    }) => void,
+    }) => Transaction | null,
   }) {
     this.find = config.find
     this.handler = config.handler
@@ -87,7 +92,7 @@ function run(config: {
   text: string,
   rules: InputRule[],
   plugin: Plugin,
-}): any {
+}): boolean {
   const {
     editor,
     from,
@@ -148,7 +153,7 @@ function run(config: {
       state,
     })
 
-    rule.handler({
+    const handler = rule.handler({
       state,
       range,
       match,
@@ -158,7 +163,7 @@ function run(config: {
     })
 
     // stop if there are no changes
-    if (!tr.steps.length) {
+    if (!handler || !tr.steps.length) {
       return
     }