diff --git a/changelog_unreleased/javascript/15204.md b/changelog_unreleased/javascript/15204.md
new file mode 100644
index 000000000000..b0bd8339e732
--- /dev/null
+++ b/changelog_unreleased/javascript/15204.md
@@ -0,0 +1,16 @@
+#### Break after `=` of assignment if RHS is poorly breakable AwaitExpression or YieldExpression (#15204 by @seiyab)
+
+<!-- prettier-ignore -->
+```js
+// Input
+const { section, rubric, authors, tags } = await utils.upsertCommonData(mainData);
+
+// Prettier stable
+const { section, rubric, authors, tags } = await utils.upsertCommonData(
+  mainData,
+);
+
+// Prettier main
+const { section, rubric, authors, tags } =
+  await utils.upsertCommonData(mainData);
+```
diff --git a/src/language-js/print/assignment.js b/src/language-js/print/assignment.js
index 8e8d032dd75a..b775194889cb 100644
--- a/src/language-js/print/assignment.js
+++ b/src/language-js/print/assignment.js
@@ -205,7 +205,11 @@ function shouldBreakAfterOperator(path, options, print, hasShortKey) {
   let node = rightNode;
   const propertiesForPath = [];
   for (;;) {
-    if (node.type === "UnaryExpression") {
+    if (
+      node.type === "UnaryExpression" ||
+      node.type === "AwaitExpression" ||
+      (node.type === "YieldExpression" && node.argument !== null)
+    ) {
       node = node.argument;
       propertiesForPath.push("argument");
     } else if (node.type === "TSNonNullExpression") {
diff --git a/tests/format/js/assignment/__snapshots__/jsfmt.spec.js.snap b/tests/format/js/assignment/__snapshots__/jsfmt.spec.js.snap
index 0ff1d7b4c1e6..90ce454a1b6b 100644
--- a/tests/format/js/assignment/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/format/js/assignment/__snapshots__/jsfmt.spec.js.snap
@@ -278,6 +278,104 @@ printWidth: 80
 ================================================================================
 `;
 
+exports[`discussion-15196.js format 1`] = `
+====================================options=====================================
+parsers: ["babel", "flow", "typescript"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+async function f() {
+  const { section, rubric, authors, tags } = await utils.upsertCommonData(mainData);
+
+  const loooooooooooooooooooooooooong1 = await looooooooooooooong.looooooooooooooong.loooooong;
+  const loooooooooooooooooooooooooong2 = await looooooooooooooong.looooooooooooooong.loooooong();
+  const loooooooooooooooooooooooooong3 = await looooooooooooooooooooooooooooooooooooooooooooog();
+  const loooooooooooooooooooooooooong4 = !await looooooooooooooong.looooooooooooooong.loooooong;
+  const loooooooooooooooooooooooooong5 = void !!await looooooooooooooong.looooooooooooooong.loooooong;
+
+  const longlonglonglonglonglonglong1 = await new Promise((resolve, reject) => { setTimeout(() => { resolve('foo'); }, 300); })
+  const longlonglonglonglonglonglong2 = await { then(onFulfilled, onRejected) { onFulfilled(1234567890) } };
+}
+
+function* g() {
+  const { section, rubric, authors, tags } = yield utils.upsertCommonData(mainData);
+
+  const loooooooooooooooooooooooooong1 = yield looooooooooooooong.looooooooooooooong.loooooong;
+  const loooooooooooooooooooooooooong2 = yield looooooooooooooong.looooooooooooooong.loooooong();
+  const loooooooooooooooooooooooooong3 = yield looooooooooooooooooooooooooooooooooooooooooooog();
+  const loooooooooooooooooooooooooong4 = !(yield looooooooooooooong.looooooooooooooong.loooooong);
+  const loooooooooooooooooooooooooong5 = void !!(yield looooooooooooooong.looooooooooooooong.loooooong);
+  const loooooooooooooooooooooooooong6 = yield* looooooooooooooong.looooooooooooooong.loooooong;
+
+  const longlonglonglonglonglonglong1 = yield qwertyuiop(asdfghjkl, zxcvbnm, qwertyuiop, asdfghjkl);
+  const longlonglonglonglonglonglong2 = yield { qwertyuiop: 1234567890, asdfghjkl: 1234567890, zxcvbnm: 123456789 };
+
+  const x = yield;
+}
+
+=====================================output=====================================
+async function f() {
+  const { section, rubric, authors, tags } =
+    await utils.upsertCommonData(mainData);
+
+  const loooooooooooooooooooooooooong1 =
+    await looooooooooooooong.looooooooooooooong.loooooong;
+  const loooooooooooooooooooooooooong2 =
+    await looooooooooooooong.looooooooooooooong.loooooong();
+  const loooooooooooooooooooooooooong3 =
+    await looooooooooooooooooooooooooooooooooooooooooooog();
+  const loooooooooooooooooooooooooong4 =
+    !(await looooooooooooooong.looooooooooooooong.loooooong);
+  const loooooooooooooooooooooooooong5 =
+    void !!(await looooooooooooooong.looooooooooooooong.loooooong);
+
+  const longlonglonglonglonglonglong1 = await new Promise((resolve, reject) => {
+    setTimeout(() => {
+      resolve("foo");
+    }, 300);
+  });
+  const longlonglonglonglonglonglong2 = await {
+    then(onFulfilled, onRejected) {
+      onFulfilled(1234567890);
+    },
+  };
+}
+
+function* g() {
+  const { section, rubric, authors, tags } =
+    yield utils.upsertCommonData(mainData);
+
+  const loooooooooooooooooooooooooong1 =
+    yield looooooooooooooong.looooooooooooooong.loooooong;
+  const loooooooooooooooooooooooooong2 =
+    yield looooooooooooooong.looooooooooooooong.loooooong();
+  const loooooooooooooooooooooooooong3 =
+    yield looooooooooooooooooooooooooooooooooooooooooooog();
+  const loooooooooooooooooooooooooong4 =
+    !(yield looooooooooooooong.looooooooooooooong.loooooong);
+  const loooooooooooooooooooooooooong5 =
+    void !!(yield looooooooooooooong.looooooooooooooong.loooooong);
+  const loooooooooooooooooooooooooong6 =
+    yield* looooooooooooooong.looooooooooooooong.loooooong;
+
+  const longlonglonglonglonglonglong1 = yield qwertyuiop(
+    asdfghjkl,
+    zxcvbnm,
+    qwertyuiop,
+    asdfghjkl,
+  );
+  const longlonglonglonglonglonglong2 = yield {
+    qwertyuiop: 1234567890,
+    asdfghjkl: 1234567890,
+    zxcvbnm: 123456789,
+  };
+
+  const x = yield;
+}
+
+================================================================================
+`;
+
 exports[`issue-1419.js format 1`] = `
 ====================================options=====================================
 parsers: ["babel", "flow", "typescript"]
diff --git a/tests/format/js/assignment/discussion-15196.js b/tests/format/js/assignment/discussion-15196.js
new file mode 100644
index 000000000000..b6836faaa239
--- /dev/null
+++ b/tests/format/js/assignment/discussion-15196.js
@@ -0,0 +1,28 @@
+async function f() {
+  const { section, rubric, authors, tags } = await utils.upsertCommonData(mainData);
+
+  const loooooooooooooooooooooooooong1 = await looooooooooooooong.looooooooooooooong.loooooong;
+  const loooooooooooooooooooooooooong2 = await looooooooooooooong.looooooooooooooong.loooooong();
+  const loooooooooooooooooooooooooong3 = await looooooooooooooooooooooooooooooooooooooooooooog();
+  const loooooooooooooooooooooooooong4 = !await looooooooooooooong.looooooooooooooong.loooooong;
+  const loooooooooooooooooooooooooong5 = void !!await looooooooooooooong.looooooooooooooong.loooooong;
+
+  const longlonglonglonglonglonglong1 = await new Promise((resolve, reject) => { setTimeout(() => { resolve('foo'); }, 300); })
+  const longlonglonglonglonglonglong2 = await { then(onFulfilled, onRejected) { onFulfilled(1234567890) } };
+}
+
+function* g() {
+  const { section, rubric, authors, tags } = yield utils.upsertCommonData(mainData);
+
+  const loooooooooooooooooooooooooong1 = yield looooooooooooooong.looooooooooooooong.loooooong;
+  const loooooooooooooooooooooooooong2 = yield looooooooooooooong.looooooooooooooong.loooooong();
+  const loooooooooooooooooooooooooong3 = yield looooooooooooooooooooooooooooooooooooooooooooog();
+  const loooooooooooooooooooooooooong4 = !(yield looooooooooooooong.looooooooooooooong.loooooong);
+  const loooooooooooooooooooooooooong5 = void !!(yield looooooooooooooong.looooooooooooooong.loooooong);
+  const loooooooooooooooooooooooooong6 = yield* looooooooooooooong.looooooooooooooong.loooooong;
+
+  const longlonglonglonglonglonglong1 = yield qwertyuiop(asdfghjkl, zxcvbnm, qwertyuiop, asdfghjkl);
+  const longlonglonglonglonglonglong2 = yield { qwertyuiop: 1234567890, asdfghjkl: 1234567890, zxcvbnm: 123456789 };
+
+  const x = yield;
+}