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wip: warn key usage of v-if branches

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This commit is contained in:
Evan You 2021-04-17 15:35:44 -04:00
parent ab21468982
commit 3528ced0b4
2 changed files with 27 additions and 7 deletions
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17
packages/compiler-core/src/errors.ts
View File

@ -14,7 +14,6 @@ export function defaultOnError(error: CompilerError) {
}
export function defaultOnWarn(msg: CompilerError) {
throw new Error('foo')
__DEV__ && console.warn(`[Vue warn]`, msg.message)
}
@ -92,13 +91,16 @@ export const enum ErrorCodes {
X_CACHE_HANDLER_NOT_SUPPORTED,
X_SCOPE_ID_NOT_SUPPORTED,
// warnings
X_V_IF_KEY,
// Special value for higher-order compilers to pick up the last code
// to avoid collision of error codes. This should always be kept as the last
// item.
__EXTEND_POINT__
}
export const errorMessages: { [code: number]: string } = {
export const errorMessages: Record<ErrorCodes, string> = {
// parse errors
[ErrorCodes.ABRUPT_CLOSING_OF_EMPTY_COMMENT]: 'Illegal comment.',
[ErrorCodes.CDATA_IN_HTML_CONTENT]:
@ -129,6 +131,7 @@ export const errorMessages: { [code: number]: string } = {
"Attribute name cannot start with '='.",
[ErrorCodes.UNEXPECTED_QUESTION_MARK_INSTEAD_OF_TAG_NAME]:
"'<?' is allowed only in XML context.",
[ErrorCodes.UNEXPECTED_NULL_CHARACTER]: `Unexpected null cahracter.`,
[ErrorCodes.UNEXPECTED_SOLIDUS_IN_TAG]: "Illegal '/' in tags.",
// Vue-specific parse errors
@ -169,5 +172,13 @@ export const errorMessages: { [code: number]: string } = {
[ErrorCodes.X_PREFIX_ID_NOT_SUPPORTED]: `"prefixIdentifiers" option is not supported in this build of compiler.`,
[ErrorCodes.X_MODULE_MODE_NOT_SUPPORTED]: `ES module mode is not supported in this build of compiler.`,
[ErrorCodes.X_CACHE_HANDLER_NOT_SUPPORTED]: `"cacheHandlers" option is only supported when the "prefixIdentifiers" option is enabled.`,
[ErrorCodes.X_SCOPE_ID_NOT_SUPPORTED]: `"scopeId" option is only supported in module mode.`
[ErrorCodes.X_SCOPE_ID_NOT_SUPPORTED]: `"scopeId" option is only supported in module mode.`,
// warnings
[ErrorCodes.X_V_IF_KEY]:
`unnecessary key usage on v-if/else branches. ` +
`Vue will automatically generate unique keys for each branch.`,
// just to fullfill types
[ErrorCodes.__EXTEND_POINT__]: ``
}

17
packages/compiler-core/src/transforms/vIf.ts
View File

@ -110,7 +110,7 @@ export function processIf(
}
if (dir.name === 'if') {
const branch = createIfBranch(node, dir)
const branch = createIfBranch(node, dir, context)
const ifNode: IfNode = {
type: NodeTypes.IF,
loc: node.loc,
@ -145,7 +145,7 @@ export function processIf(
if (sibling && sibling.type === NodeTypes.IF) {
// move the node to the if node's branches
context.removeNode()
const branch = createIfBranch(node, dir)
const branch = createIfBranch(node, dir, context)
if (__DEV__ && comments.length) {
branch.children = [...comments, ...branch.children]
}
@ -187,7 +187,16 @@ export function processIf(
}
}
function createIfBranch(node: ElementNode, dir: DirectiveNode): IfBranchNode {
function createIfBranch(
node: ElementNode,
dir: DirectiveNode,
context: TransformContext
): IfBranchNode {
const userKey = findProp(node, `key`)
if (__DEV__ && userKey) {
context.onWarn(createCompilerError(ErrorCodes.X_V_IF_KEY, userKey.loc))
}
return {
type: NodeTypes.IF_BRANCH,
loc: node.loc,
@ -196,7 +205,7 @@ function createIfBranch(node: ElementNode, dir: DirectiveNode): IfBranchNode {
node.tagType === ElementTypes.TEMPLATE && !findDir(node, 'for')
? node.children
: [node],
userKey: findProp(node, `key`)
userKey
}
}