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import {
Data,
ComponentInternalInstance,
ConcreteComponent,
formatComponentName
} from './component'
import { isString, isFunction } from '@vue/shared'
import { toRaw, isRef, pauseTracking, resetTracking } from '@vue/reactivity'
import { callWithErrorHandling, ErrorCodes } from './errorHandling'
type ComponentVNode = VNode & {
type: ConcreteComponent
}
const stack: VNode[] = []
type TraceEntry = {
vnode: ComponentVNode
recurseCount: number
}
type ComponentTraceStack = TraceEntry[]
export function pushWarningContext(vnode: VNode) {
stack.push(vnode)
}
export function popWarningContext() {
stack.pop()
}
export function warn(msg: string, ...args: any[]) {
Iif (!__DEV__) return
// avoid props formatting or warn handler tracking deps that might be mutated
// during patch, leading to infinite recursion.
pauseTracking()
const instance = stack.length ? stack[stack.length - 1].component : null
const appWarnHandler = instance && instance.appContext.config.warnHandler
const trace = getComponentTrace()
if (appWarnHandler) {
callWithErrorHandling(
appWarnHandler,
instance,
ErrorCodes.APP_WARN_HANDLER,
[
msg + args.join(''),
instance && instance.proxy,
trace
.map(
({ vnode }) => `at <${formatComponentName(instance, vnode.type)}>`
)
.join('\n'),
trace
]
)
} else {
const warnArgs = [`[Vue warn]: ${msg}`, ...args]
/* istanbul ignore if */
if (
trace.length &&
// avoid spamming console during tests
!__TEST__
) {
warnArgs.push(`\n`, ...formatTrace(trace))
}
console.warn(...warnArgs)
}
resetTracking()
}
export function getComponentTrace(): ComponentTraceStack {
let currentVNode: VNode | null = stack[stack.length - 1]
if (!currentVNode) {
return []
}
// we can't just use the stack because it will be incomplete during updates
// that did not start from the root. Re-construct the parent chain using
// instance parent pointers.
const normalizedStack: ComponentTraceStack = []
while (currentVNode) {
const last = normalizedStack[0]
Iif (last && last.vnode === currentVNode) {
last.recurseCount++
} else {
normalizedStack.push({
vnode: currentVNode as ComponentVNode,
recurseCount: 0
})
}
const parentInstance: ComponentInternalInstance | null =
currentVNode.component && currentVNode.component.parent
currentVNode = parentInstance && parentInstance.vnode
}
return normalizedStack
}
/* istanbul ignore next */
function formatTrace(trace: ComponentTraceStack): any[] {
const logs: any[] = []
trace.forEach((entry, i) => {
logs.push(...(i === 0 ? [] : [`\n`]), ...formatTraceEntry(entry))
})
return logs
}
function formatTraceEntry({ vnode, recurseCount }: TraceEntry): any[] {
const postfix =
recurseCount > 0 ? `... (${recurseCount} recursive calls)` : ``
const isRoot = vnode.component ? vnode.component.parent == null : false
const open = ` at <${formatComponentName(
vnode.component,
vnode.type,
isRoot
)}`
const close = `>` + postfix
return vnode.props
? [open, ...formatProps(vnode.props), close]
: [open + close]
}
/* istanbul ignore next */
function formatProps(props: Data): any[] {
const res: any[] = []
const keys = Object.keys(props)
keys.slice(0, 3).forEach(key => {
res.push(...formatProp(key, props[key]))
})
if (keys.length > 3) {
res.push(` ...`)
}
return res
}
function formatProp(key: string, value: unknown): any[]
function formatProp(key: string, value: unknown, raw: true): any
/* istanbul ignore next */
function formatProp(key: string, value: unknown, raw?: boolean): any {
if (isString(value)) {
value = JSON.stringify(value)
return raw ? value : [`${key}=${value}`]
} else if (
typeof value === 'number' ||
typeof value === 'boolean' ||
value == null
) {
return raw ? value : [`${key}=${value}`]
} else if (isRef(value)) {
value = formatProp(key, toRaw(value.value), true)
return raw ? value : [`${key}=Ref<`, value, `>`]
} else if (isFunction(value)) {
return [`${key}=fn${value.name ? `<${value.name}>` : ``}`]
} else {
value = toRaw(value)
return raw ? value : [`${key}=`, value]
}
}
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