diff --git a/packages/core/src/annotations.test.ts b/packages/core/src/annotations.test.ts
index b034af8f12..e1c6a1759e 100644
--- a/packages/core/src/annotations.test.ts
+++ b/packages/core/src/annotations.test.ts
@@ -3,7 +3,7 @@ import { parseAnnotations } from "./annotations"
 import assert from "assert/strict"
 
 describe("annotations", () => {
-    test("error", () => {
+    test("github", () => {
         const output = `
 ::error file=packages/core/src/github.ts,line=71,endLine=71,code=concatenation_override::The change on line 71 may lead to the original \`text\` content being overridden instead of appending the footer. Consider using \`text = appendGeneratedComment(script, info, text)\` to ensure the original text is preserved and the footer is appended. 😇
 
@@ -25,4 +25,21 @@ describe("annotations", () => {
             "The change on line 71 may lead to the original `text` content being overridden instead of appending the footer. Consider using `text = appendGeneratedComment(script, info, text)` to ensure the original text is preserved and the footer is appended. 😇"
         )
     })
+
+    test("tsc", () => {
+        const output = `
+
+src/annotations.ts:11:28 - error TS1005: ',' expected.
+        `
+
+        const diags = parseAnnotations(output)
+        // console.log(diags)
+        assert.strictEqual(diags.length, 1)
+        assert.strictEqual(diags[0].severity, "error")
+        assert.strictEqual(diags[0].filename, "src/annotations.ts")
+        assert.strictEqual(diags[0].range[0][0], 10)
+        assert.strictEqual(diags[0].range[1][0], 27)
+        assert.strictEqual(diags[0].code, "TS1005")
+        assert.strictEqual(diags[0].message, "',' expected.")
+    })
 })
diff --git a/packages/core/src/annotations.ts b/packages/core/src/annotations.ts
index 1ac67d1171..38b2b39226 100644
--- a/packages/core/src/annotations.ts
+++ b/packages/core/src/annotations.ts
@@ -1,3 +1,4 @@
+// https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/workflow-commands-for-github-actions#setting-an-error-message
 const GITHUB_ANNOTATIONS_RX =
     /^\s*::(?<severity>notice|warning|error)\s*file=(?<file>[^,]+),\s*line=(?<line>\d+),\s*endLine=(?<endLine>\d+)\s*(,\s*code=(?<code>[^,:]+)?\s*)?::(?<message>.*)$/gim
 // ##vso[task.logissue type=warning;sourcepath=consoleap
@@ -6,18 +7,38 @@ const GITHUB_ANNOTATIONS_RX =
 const AZURE_DEVOPS_ANNOTATIONS_RX =
     /^\s*##vso\[task.logissue\s+type=(?<severity>error|warning);sourcepath=(?<file>);linenumber=(?<line>\d+)(;code=(?<code>\d+);)?[^\]]*\](?<message>.*)$/gim
 
+// https://code.visualstudio.com/docs/editor/tasks#_background-watching-tasks
+const TYPESCRIPT_ANNOTATIONS_RX =
+    /^(?<file>[^:\s].*?):(?<line>\d+)(?::(?<endLine>\d+))?(?::\d+)?\s+-\s+(?<severity>error|warning)\s+(?<code>[^:]+)\s*:\s*(?<message>.*)$/gim
+
 /**
- * Matches ::(notice|warning|error) file=<filename>,line=<start line>::<message>
+ * Matches TypeScript, GitHub Actions and Azure DevOps annotations
  * @param line
+ * @link https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/workflow-commands-for-github-actions#setting-an-error-message
  */
 export function parseAnnotations(text: string): Diagnostic[] {
     if (!text) return []
     const sevMap: Record<string, DiagnosticSeverity> = {
+        ["info"]: "info",
         ["notice"]: "info",
         ["warning"]: "warning",
         ["error"]: "error",
     }
-    const annotations: Record<string, Diagnostic> = {}
+    const annotations = new Set<Diagnostic>()
+    for (const m of text.matchAll(TYPESCRIPT_ANNOTATIONS_RX)) {
+        const { file, line, endLine, severity, code, message } = m.groups
+        const annotation: Diagnostic = {
+            severity: sevMap[severity],
+            filename: file,
+            range: [
+                [parseInt(line) - 1, 0],
+                [parseInt(endLine) - 1, Number.MAX_VALUE],
+            ],
+            message,
+            code,
+        }
+        annotations.add(annotation)
+    }
     text.replace(
         GITHUB_ANNOTATIONS_RX,
         (_, severity, file, line, endLine, __, code, message) => {
@@ -31,12 +52,11 @@ export function parseAnnotations(text: string): Diagnostic[] {
                 message,
                 code,
             }
-            const key = JSON.stringify(annotation)
-            annotations[key] = annotation
+            annotations.add(annotation)
             return ""
         }
     )
-    text?.replace(
+    text.replace(
         AZURE_DEVOPS_ANNOTATIONS_RX,
         (_, severity, file, line, __, code, message) => {
             const annotation: Diagnostic = {
@@ -49,12 +69,11 @@ export function parseAnnotations(text: string): Diagnostic[] {
                 message,
                 code,
             }
-            const key = JSON.stringify(annotation)
-            annotations[key] = annotation
+            annotations.add(annotation)
             return ""
         }
     )
-    return Object.values(annotations)
+    return Array.from(annotations.values())
 }
 
 export function convertDiagnosticToGitHubActionCommand(d: Diagnostic) {