Fix printer for explicitly inexact Flow types (#10041)

Closes: https://github.com/babel/babel/issues/10040

packages/babel-generator/src/generators/flow.js

@@ -409,7 +409,7 @@ export function ObjectTypeAnnotation(node: Object) {
       indent: true,
       statement: true,
       iterator: () => {
-        if (props.length !== 1) {
+        if (props.length !== 1 || node.inexact) {
           this.token(",");
           this.space();
         }
@@ -419,6 +419,15 @@ export function ObjectTypeAnnotation(node: Object) {
     this.space();
   }
 
+  if (node.inexact) {
+    this.indent();
+    this.token("...");
+    if (props.length) {
+      this.newline();
+    }
+    this.dedent();
+  }
+
   if (node.exact) {
     this.token("|}");
   } else {

packages/babel-generator/test/fixtures/flow/object-literal-types-compact/input.js

@@ -0,0 +1,4 @@
+type T1 = { ... };
+type T2 = { a: { b: { c: {...}, ... }, ... } }
+type T3 = { foo: number, ... };
+type T4 = { foo: number, bar: string, ... };

packages/babel-generator/test/fixtures/flow/object-literal-types-compact/options.json

@@ -0,0 +1,3 @@
+{
+  "compact": true
+}

packages/babel-generator/test/fixtures/flow/object-literal-types-compact/output.js

@@ -0,0 +1 @@
+type T1={...};type T2={a:{b:{c:{...},...},...}};type T3={foo:number,...};type T4={foo:number,bar:string,...};

packages/babel-generator/test/fixtures/flow/object-literal-types/input.js

@@ -9,3 +9,7 @@ type T6 = { foo(): number }
 type T7 = { foo: () => number }
 type T8 = { [string]: U };
 type T9 = { [param: string]: U };
+type T10 = { ... };
+type T11 = { a: { b: { c: {...}, ... }, ... } }
+type T12 = { foo: number, ... };
+type T13 = { foo: number, bar: string, ... };

packages/babel-generator/test/fixtures/flow/object-literal-types/output.js

@@ -28,3 +28,22 @@ type T8 = {
 type T9 = {
   [param: string]: U
 };
+type T10 = {...};
+type T11 = {
+  a: {
+    b: {
+      c: {...},
+      ...
+    },
+    ...
+  }
+};
+type T12 = {
+  foo: number,
+  ...
+};
+type T13 = {
+  foo: number,
+  bar: string,
+  ...
+};