From 0d3848eddf7417c36112874067305dc5b0d54a87 Mon Sep 17 00:00:00 2001
From: Vitaly Turovsky <vital2580@icloud.com>
Date: Mon, 21 Oct 2024 02:23:23 +0300
Subject: [PATCH 1/2] feat: You can now ctrl+click on event name of methods
 like addListener, on for jumping into event-related listeners or triggers
 like `emit`

---
 typescript/src/definitions.ts      |  4 ++
 typescript/src/eventsReferences.ts | 62 ++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 typescript/src/eventsReferences.ts

diff --git a/typescript/src/definitions.ts b/typescript/src/definitions.ts
index ef749b4..57ab44e 100644
--- a/typescript/src/definitions.ts
+++ b/typescript/src/definitions.ts
@@ -1,6 +1,7 @@
 import { join } from 'path-browserify'
 import { GetConfig } from './types'
 import { findChildContainingExactPosition } from './utils'
+import { eventDefinitions } from './eventsReferences'
 
 export default (proxy: ts.LanguageService, languageService: ts.LanguageService, languageServiceHost: ts.LanguageServiceHost, c: GetConfig) => {
     proxy.getDefinitionAndBoundSpan = (fileName, position, ...props) => {
@@ -26,6 +27,9 @@ export default (proxy: ts.LanguageService, languageService: ts.LanguageService,
         const noDefs = !prior?.definitions || prior.definitions.length === 0
         const tryFileResolve = noDefs || ['?', '#'].some(x => prior.definitions?.[0]?.fileName?.includes(x))
 
+        const eventDefs = eventDefinitions(languageService, fileName, position)
+        if (eventDefs) return eventDefs
+
         // Definition fallbacks
         if (noDefs || tryFileResolve) {
             const node = getNode()
diff --git a/typescript/src/eventsReferences.ts b/typescript/src/eventsReferences.ts
new file mode 100644
index 0000000..1e384b6
--- /dev/null
+++ b/typescript/src/eventsReferences.ts
@@ -0,0 +1,62 @@
+import ts from 'typescript'
+import { findChildContainingExactPosition, matchParents } from './utils'
+
+export const eventDefinitions = (languageService: ts.LanguageService, fileName: string, position: number): ts.DefinitionInfoAndBoundSpan | undefined => {
+    const program = languageService.getProgram()!
+    const sourceFile = program.getSourceFile(fileName)!
+    const node = findChildContainingExactPosition(sourceFile, position)
+    if (!node || !ts.isStringLiteral(node)) return
+    const eventName = node.text
+    const expr = matchParents(node, ['StringLiteral', 'CallExpression'])
+    if (!expr) return
+    if (!ts.isPropertyAccessExpression(expr.expression)) return
+    const parentAccessEndPos = expr.expression.expression.getEnd()
+    const method = expr.expression.name.text
+    let lookForMethods: string[] | undefined
+    const onMethods = ['on', 'once', 'off', 'addEventListener', 'removeEventListener', 'addListener', 'removeListener']
+    const triggerMethods = ['trigger', 'emit', 'dispatchEvent']
+    if (onMethods.includes(method)) {
+        lookForMethods = triggerMethods
+    }
+    if (triggerMethods.includes(method)) {
+        lookForMethods = onMethods
+    }
+    if (!lookForMethods) return
+    const references = languageService.findReferences(fileName, parentAccessEndPos) ?? []
+    const defs: ts.DefinitionInfo[] = references
+        .flatMap(({ references }) => references)
+        .map(({ fileName, textSpan }): ts.DefinitionInfo | undefined => {
+            const sourceFile = program.getSourceFile(fileName)!
+            const node = findChildContainingExactPosition(sourceFile, textSpan.start)
+            if (!node) return
+            if (!ts.isPropertyAccessExpression(node.parent)) return
+            let upNode = node as ts.PropertyAccessExpression
+            while (ts.isPropertyAccessExpression(upNode.parent)) {
+                upNode = upNode.parent
+            }
+            if (!ts.isCallExpression(upNode.parent)) return
+            if (!ts.isPropertyAccessExpression(upNode.parent.expression)) return
+            const method = upNode.parent.expression.name.text
+            if (!lookForMethods!.includes(method)) return
+            const arg = upNode.parent.arguments[0]
+            if (!arg || !ts.isStringLiteral(arg)) return
+            const lastArgEnd = upNode.parent.arguments.at(-1)!.end
+            const span = ts.createTextSpanFromBounds(arg.pos, lastArgEnd)
+            if (arg.text !== eventName) return
+
+            return {
+                kind: ts.ScriptElementKind.memberVariableElement,
+                name: method,
+                containerKind: ts.ScriptElementKind.variableElement,
+                containerName: method,
+                textSpan: span,
+                fileName,
+            }
+        })
+        .filter(a => a !== undefined)
+        .map(a => a!)
+    return {
+        textSpan: ts.createTextSpanFromBounds(node.pos, node.end),
+        definitions: defs,
+    }
+}

From e71c7a615c87148bed0b19b9bc8496fcfacd10cf Mon Sep 17 00:00:00 2001
From: Vitaly Turovsky <vital2580@icloud.com>
Date: Mon, 21 Oct 2024 02:26:29 +0300
Subject: [PATCH 2/2] fix lint

---
 typescript/src/eventsReferences.ts | 1 -
 1 file changed, 1 deletion(-)

diff --git a/typescript/src/eventsReferences.ts b/typescript/src/eventsReferences.ts
index 1e384b6..e7d9dfc 100644
--- a/typescript/src/eventsReferences.ts
+++ b/typescript/src/eventsReferences.ts
@@ -1,4 +1,3 @@
-import ts from 'typescript'
 import { findChildContainingExactPosition, matchParents } from './utils'
 
 export const eventDefinitions = (languageService: ts.LanguageService, fileName: string, position: number): ts.DefinitionInfoAndBoundSpan | undefined => {