fix(language-core): do not emit undefined for model with falsy default value (#5198)

RylanBueckert-Broadsign · KazariEX · web-flow · commit 548e158c0bd2 · 2025-02-20T00:17:33.000+08:00
Co-authored-by: 山吹色御守 &lt;85992002+KazariEX@users.noreply.github.com&gt;
diff --git a/packages/language-core/lib/codegen/script/scriptSetup.ts b/packages/language-core/lib/codegen/script/scriptSetup.ts
@@ -536,7 +536,7 @@ function* generateModelEmit(
 			const [propName, localName] = getPropAndLocalName(scriptSetup, defineModel);
 			yield `'update:${propName}': [value: `;
 			yield* generateDefinePropType(scriptSetup, propName, localName, defineModel);
-			if (!defineModel.required && !defineModel.defaultValue) {
+			if (!defineModel.required && defineModel.defaultValue === undefined) {
 				yield ` | undefined`;
 			}
 			yield `]${endOfLine}`;

Original file line number	Diff line number	Diff line change
`@@ -536,7 +536,7 @@ function* generateModelEmit(`
`536`	`536`	`const [propName, localName] = getPropAndLocalName(scriptSetup, defineModel);`
`537`	`537`	yield `'update:${propName}': [value: `;
`538`	`538`	`yield* generateDefinePropType(scriptSetup, propName, localName, defineModel);`
`539`		`- if (!defineModel.required && !defineModel.defaultValue) {`
	`539`	`+ if (!defineModel.required && defineModel.defaultValue === undefined) {`
`540`	`540`	yield ` \| undefined`;
`541`	`541`	`}`
`542`	`542`	yield `]${endOfLine}`;