diff --git a/changelog_unreleased/typescript/12508.md b/changelog_unreleased/typescript/12508.md
new file mode 100644
index 000000000000..2113a7caa58a
--- /dev/null
+++ b/changelog_unreleased/typescript/12508.md
@@ -0,0 +1,37 @@
+#### Fix non-idempotent formatting of function calls with complex type arguments (#12508 by @sosukesuzuki)
+
+<!-- prettier-ignore -->
+```tsx
+// Input
+const foo =
+  doSomething<{ foo1: "foo1", foo2: "foo2", foo3: "foo3", foo4: "foo4", foo5: "foo5" }>();
+
+// Prettier stable (first)
+const foo =
+  doSomething<{
+    foo1: "foo1";
+    foo2: "foo2";
+    foo3: "foo3";
+    foo4: "foo4";
+    foo5: "foo5";
+  }>();
+
+// Prettier stable (second)
+const foo = doSomething<{
+  foo1: "foo1";
+  foo2: "foo2";
+  foo3: "foo3";
+  foo4: "foo4";
+  foo5: "foo5";
+}>();
+
+// Prettier main
+const foo = doSomething<{
+  foo1: "foo1";
+  foo2: "foo2";
+  foo3: "foo3";
+  foo4: "foo4";
+  foo5: "foo5";
+}>();
+
+```
diff --git a/src/language-js/print/assignment.js b/src/language-js/print/assignment.js
index 972c2f58a2b7..5415b56af2aa 100644
--- a/src/language-js/print/assignment.js
+++ b/src/language-js/print/assignment.js
@@ -441,7 +441,9 @@ function isCallExpressionWithComplexTypeArguments(node, print) {
         firstArg.type === "TSUnionType" ||
         firstArg.type === "UnionTypeAnnotation" ||
         firstArg.type === "TSIntersectionType" ||
-        firstArg.type === "IntersectionTypeAnnotation"
+        firstArg.type === "IntersectionTypeAnnotation" ||
+        firstArg.type === "TSTypeLiteral" ||
+        firstArg.type === "ObjectTypeAnnotation"
       ) {
         return true;
       }
diff --git a/tests/format/flow/assignments/__snapshots__/jsfmt.spec.js.snap b/tests/format/flow/assignments/__snapshots__/jsfmt.spec.js.snap
index d34376ab4ce1..39d340a96511 100644
--- a/tests/format/flow/assignments/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/format/flow/assignments/__snapshots__/jsfmt.spec.js.snap
@@ -110,3 +110,52 @@ const map: Map<Function, Foo<S>> = new Map();
 
 ================================================================================
 `;
+
+exports[`issue-12413.js format 1`] = `
+====================================options=====================================
+parsers: ["babel-flow", "flow"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+let emit =
+  defineEmits<{ (event: "ready", canvas: HTMLCanvasElement): void; (event:"resize",canvas:HTMLCanvasElement):void; }>();
+
+let abc =
+  func<{a:2,b:3,d:78,e:9,f:8,g:7,h:6,i:5,j:4,k:3,l:2,m:1,n:0,o:9,p:8,q:7,r:6,s:5,t:4,u:3,v:2,w:1,x:0,y:9,z:8}>();
+
+=====================================output=====================================
+let emit = defineEmits<{
+  (event: "ready", canvas: HTMLCanvasElement): void,
+  (event: "resize", canvas: HTMLCanvasElement): void,
+}>();
+
+let abc = func<{
+  a: 2,
+  b: 3,
+  d: 78,
+  e: 9,
+  f: 8,
+  g: 7,
+  h: 6,
+  i: 5,
+  j: 4,
+  k: 3,
+  l: 2,
+  m: 1,
+  n: 0,
+  o: 9,
+  p: 8,
+  q: 7,
+  r: 6,
+  s: 5,
+  t: 4,
+  u: 3,
+  v: 2,
+  w: 1,
+  x: 0,
+  y: 9,
+  z: 8,
+}>();
+
+================================================================================
+`;
diff --git a/tests/format/flow/assignments/issue-12413.js b/tests/format/flow/assignments/issue-12413.js
new file mode 100644
index 000000000000..9161eb5f648a
--- /dev/null
+++ b/tests/format/flow/assignments/issue-12413.js
@@ -0,0 +1,5 @@
+let emit =
+  defineEmits<{ (event: "ready", canvas: HTMLCanvasElement): void; (event:"resize",canvas:HTMLCanvasElement):void; }>();
+
+let abc =
+  func<{a:2,b:3,d:78,e:9,f:8,g:7,h:6,i:5,j:4,k:3,l:2,m:1,n:0,o:9,p:8,q:7,r:6,s:5,t:4,u:3,v:2,w:1,x:0,y:9,z:8}>();
diff --git a/tests/format/typescript/assignment/__snapshots__/jsfmt.spec.js.snap b/tests/format/typescript/assignment/__snapshots__/jsfmt.spec.js.snap
index b2c3575e6232..be749c189365 100644
--- a/tests/format/typescript/assignment/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/format/typescript/assignment/__snapshots__/jsfmt.spec.js.snap
@@ -443,6 +443,55 @@ const map: Map<Function, Foo<S>> = new Map();
 ================================================================================
 `;
 
+exports[`issue-12413.ts format 1`] = `
+====================================options=====================================
+parsers: ["typescript"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+let emit =
+  defineEmits<{ (event: "ready", canvas: HTMLCanvasElement): void; (event:"resize",canvas:HTMLCanvasElement):void; }>();
+
+let abc =
+  func<{a:2,b:3,d:78,e:9,f:8,g:7,h:6,i:5,j:4,k:3,l:2,m:1,n:0,o:9,p:8,q:7,r:6,s:5,t:4,u:3,v:2,w:1,x:0,y:9,z:8}>();
+
+=====================================output=====================================
+let emit = defineEmits<{
+  (event: "ready", canvas: HTMLCanvasElement): void;
+  (event: "resize", canvas: HTMLCanvasElement): void;
+}>();
+
+let abc = func<{
+  a: 2;
+  b: 3;
+  d: 78;
+  e: 9;
+  f: 8;
+  g: 7;
+  h: 6;
+  i: 5;
+  j: 4;
+  k: 3;
+  l: 2;
+  m: 1;
+  n: 0;
+  o: 9;
+  p: 8;
+  q: 7;
+  r: 6;
+  s: 5;
+  t: 4;
+  u: 3;
+  v: 2;
+  w: 1;
+  x: 0;
+  y: 9;
+  z: 8;
+}>();
+
+================================================================================
+`;
+
 exports[`lone-arg.ts format 1`] = `
 ====================================options=====================================
 parsers: ["typescript"]
diff --git a/tests/format/typescript/assignment/issue-12413.ts b/tests/format/typescript/assignment/issue-12413.ts
new file mode 100644
index 000000000000..9161eb5f648a
--- /dev/null
+++ b/tests/format/typescript/assignment/issue-12413.ts
@@ -0,0 +1,5 @@
+let emit =
+  defineEmits<{ (event: "ready", canvas: HTMLCanvasElement): void; (event:"resize",canvas:HTMLCanvasElement):void; }>();
+
+let abc =
+  func<{a:2,b:3,d:78,e:9,f:8,g:7,h:6,i:5,j:4,k:3,l:2,m:1,n:0,o:9,p:8,q:7,r:6,s:5,t:4,u:3,v:2,w:1,x:0,y:9,z:8}>();