fix(compiler): warn against v-bind with empty attribute value

yyx990803 · yyx990803 · commit 675330ba5420 · 2020-05-07T10:32:54.000-04:00
ref: #1128 (comment)
diff --git a/packages/compiler-core/src/transforms/vBind.ts b/packages/compiler-core/src/transforms/vBind.ts
@@ -10,7 +10,7 @@ import { CAMELIZE } from '../runtimeHelpers'
 export const transformBind: DirectiveTransform = (dir, node, context) => {
   const { exp, modifiers, loc } = dir
   const arg = dir.arg!
-  if (!exp) {
+  if (!exp || (exp.type === NodeTypes.SIMPLE_EXPRESSION && !exp.content)) {
     context.onError(createCompilerError(ErrorCodes.X_V_BIND_NO_EXPRESSION, loc))
   }
   // .prop is no longer necessary due to new patch behavior

Original file line number	Diff line number	Diff line change
`@@ -10,7 +10,7 @@ import { CAMELIZE } from '../runtimeHelpers'`
`10`	`10`	`export const transformBind: DirectiveTransform = (dir, node, context) => {`
`11`	`11`	`const { exp, modifiers, loc } = dir`
`12`	`12`	`const arg = dir.arg!`
`13`		`- if (!exp) {`
	`13`	`+ if (!exp \|\| (exp.type === NodeTypes.SIMPLE_EXPRESSION && !exp.content)) {`
`14`	`14`	`context.onError(createCompilerError(ErrorCodes.X_V_BIND_NO_EXPRESSION, loc))`
`15`	`15`	`}`
`16`	`16`	`// .prop is no longer necessary due to new patch behavior`