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enhance the warning when use undeclared variable in template #5010

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5 changes: 5 additions & 0 deletions packages/runtime-core/src/componentPublicInstance.ts
Original file line number Diff line number Diff line change
Expand Up @@ -526,6 +526,11 @@ export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
`but is not defined on instance.`,
)
}
} else if (__DEV__ && !__TEST__ && !(key[0] === '$' || key[0] === '_')) {
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warn(
`Property ${JSON.stringify(key)} was accessed during render ` +
`but is not defined on instance.`,
)
}
},

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