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128x 248x | import { NodeTransform, TransformContext } from '../transform'
import {
NodeTypes,
ElementTypes,
CallExpression,
ObjectExpression,
ElementNode,
DirectiveNode,
ExpressionNode,
ArrayExpression,
createCallExpression,
createArrayExpression,
createObjectProperty,
createSimpleExpression,
createObjectExpression,
Property,
ComponentNode,
VNodeCall,
TemplateTextChildNode,
DirectiveArguments,
createVNodeCall,
ConstantTypes
} from '../ast'
import {
PatchFlags,
PatchFlagNames,
isSymbol,
isOn,
isObject,
isReservedProp,
capitalize,
camelize,
isBuiltInDirective
} from '@vue/shared'
import { createCompilerError, ErrorCodes } from '../errors'
import {
RESOLVE_DIRECTIVE,
RESOLVE_COMPONENT,
RESOLVE_DYNAMIC_COMPONENT,
MERGE_PROPS,
NORMALIZE_CLASS,
NORMALIZE_STYLE,
NORMALIZE_PROPS,
TO_HANDLERS,
TELEPORT,
KEEP_ALIVE,
SUSPENSE,
UNREF,
GUARD_REACTIVE_PROPS
} from '../runtimeHelpers'
import {
getInnerRange,
toValidAssetId,
findProp,
isCoreComponent,
isStaticArgOf,
findDir,
isStaticExp
} from '../utils'
import { buildSlots } from './vSlot'
import { getConstantType } from './hoistStatic'
import { BindingTypes } from '../options'
import {
checkCompatEnabled,
CompilerDeprecationTypes,
isCompatEnabled
} from '../compat/compatConfig'
// some directive transforms (e.g. v-model) may return a symbol for runtime
// import, which should be used instead of a resolveDirective call.
const directiveImportMap = new WeakMap<DirectiveNode, symbol>()
// generate a JavaScript AST for this element's codegen
export const transformElement: NodeTransform = (node, context) => {
// perform the work on exit, after all child expressions have been
// processed and merged.
return function postTransformElement() {
node = context.currentNode!
if (
!(
node.type === NodeTypes.ELEMENT &&
(node.tagType === ElementTypes.ELEMENT ||
node.tagType === ElementTypes.COMPONENT)
)
) {
return
}
const { tag, props } = node
const isComponent = node.tagType === ElementTypes.COMPONENT
// The goal of the transform is to create a codegenNode implementing the
// VNodeCall interface.
let vnodeTag = isComponent
? resolveComponentType(node as ComponentNode, context)
: `"${tag}"`
const isDynamicComponent =
isObject(vnodeTag) && vnodeTag.callee === RESOLVE_DYNAMIC_COMPONENT
let vnodeProps: VNodeCall['props']
let vnodeChildren: VNodeCall['children']
let vnodePatchFlag: VNodeCall['patchFlag']
let patchFlag: number = 0
let vnodeDynamicProps: VNodeCall['dynamicProps']
let dynamicPropNames: string[] | undefined
let vnodeDirectives: VNodeCall['directives']
let shouldUseBlock =
// dynamic component may resolve to plain elements
isDynamicComponent ||
vnodeTag === TELEPORT ||
vnodeTag === SUSPENSE ||
(!isComponent &&
// <svg> and <foreignObject> must be forced into blocks so that block
// updates inside get proper isSVG flag at runtime. (#639, #643)
// This is technically web-specific, but splitting the logic out of core
// leads to too much unnecessary complexity.
(tag === 'svg' || tag === 'foreignObject'))
// props
if (props.length > 0) {
const propsBuildResult = buildProps(
node,
context,
undefined,
isComponent,
isDynamicComponent
)
vnodeProps = propsBuildResult.props
patchFlag = propsBuildResult.patchFlag
dynamicPropNames = propsBuildResult.dynamicPropNames
const directives = propsBuildResult.directives
vnodeDirectives =
directives && directives.length
? (createArrayExpression(
directives.map(dir => buildDirectiveArgs(dir, context))
) as DirectiveArguments)
: undefined
if (propsBuildResult.shouldUseBlock) {
shouldUseBlock = true
}
}
// children
if (node.children.length > 0) {
if (vnodeTag === KEEP_ALIVE) {
// Although a built-in component, we compile KeepAlive with raw children
// instead of slot functions so that it can be used inside Transition
// or other Transition-wrapping HOCs.
// To ensure correct updates with block optimizations, we need to:
// 1. Force keep-alive into a block. This avoids its children being
// collected by a parent block.
shouldUseBlock = true
// 2. Force keep-alive to always be updated, since it uses raw children.
patchFlag |= PatchFlags.DYNAMIC_SLOTS
Iif (__DEV__ && node.children.length > 1) {
context.onError(
createCompilerError(ErrorCodes.X_KEEP_ALIVE_INVALID_CHILDREN, {
start: node.children[0].loc.start,
end: node.children[node.children.length - 1].loc.end,
source: ''
})
)
}
}
const shouldBuildAsSlots =
isComponent &&
// Teleport is not a real component and has dedicated runtime handling
vnodeTag !== TELEPORT &&
// explained above.
vnodeTag !== KEEP_ALIVE
if (shouldBuildAsSlots) {
const { slots, hasDynamicSlots } = buildSlots(node, context)
vnodeChildren = slots
if (hasDynamicSlots) {
patchFlag |= PatchFlags.DYNAMIC_SLOTS
}
} else if (node.children.length === 1 && vnodeTag !== TELEPORT) {
const child = node.children[0]
const type = child.type
// check for dynamic text children
const hasDynamicTextChild =
type === NodeTypes.INTERPOLATION ||
type === NodeTypes.COMPOUND_EXPRESSION
if (
hasDynamicTextChild &&
getConstantType(child, context) === ConstantTypes.NOT_CONSTANT
) {
patchFlag |= PatchFlags.TEXT
}
// pass directly if the only child is a text node
// (plain / interpolation / expression)
if (hasDynamicTextChild || type === NodeTypes.TEXT) {
vnodeChildren = child as TemplateTextChildNode
} else {
vnodeChildren = node.children
}
} else {
vnodeChildren = node.children
}
}
// patchFlag & dynamicPropNames
if (patchFlag !== 0) {
if (__DEV__) {
Iif (patchFlag < 0) {
// special flags (negative and mutually exclusive)
vnodePatchFlag = patchFlag + ` /* ${PatchFlagNames[patchFlag]} */`
} else {
// bitwise flags
const flagNames = Object.keys(PatchFlagNames)
.map(Number)
.filter(n => n > 0 && patchFlag & n)
.map(n => PatchFlagNames[n])
.join(`, `)
vnodePatchFlag = patchFlag + ` /* ${flagNames} */`
}
} else E{
vnodePatchFlag = String(patchFlag)
}
if (dynamicPropNames && dynamicPropNames.length) {
vnodeDynamicProps = stringifyDynamicPropNames(dynamicPropNames)
}
}
node.codegenNode = createVNodeCall(
context,
vnodeTag,
vnodeProps,
vnodeChildren,
vnodePatchFlag,
vnodeDynamicProps,
vnodeDirectives,
!!shouldUseBlock,
false /* disableTracking */,
isComponent,
node.loc
)
}
}
export function resolveComponentType(
node: ComponentNode,
context: TransformContext,
ssr = false
) {
let { tag } = node
// 1. dynamic component
const isExplicitDynamic = isComponentTag(tag)
const isProp = findProp(node, 'is')
if (isProp) {
if (
isExplicitDynamic ||
(__COMPAT__ &&
isCompatEnabled(
CompilerDeprecationTypes.COMPILER_IS_ON_ELEMENT,
context
))
) {
const exp =
isProp.type === NodeTypes.ATTRIBUTE
? isProp.value && createSimpleExpression(isProp.value.content, true)
: isProp.exp
if (exp) {
return createCallExpression(context.helper(RESOLVE_DYNAMIC_COMPONENT), [
exp
])
}
} else Iif (
isProp.type === NodeTypes.ATTRIBUTE &&
isProp.value!.content.startsWith('vue:')
) {
// <button is="vue:xxx">
// if not <component>, only is value that starts with "vue:" will be
// treated as component by the parse phase and reach here, unless it's
// compat mode where all is values are considered components
tag = isProp.value!.content.slice(4)
}
}
// 1.5 v-is (TODO: Deprecate)
const isDir = !isExplicitDynamic && findDir(node, 'is')
if (isDir && isDir.exp) {
return createCallExpression(context.helper(RESOLVE_DYNAMIC_COMPONENT), [
isDir.exp
])
}
// 2. built-in components (Teleport, Transition, KeepAlive, Suspense...)
const builtIn = isCoreComponent(tag) || context.isBuiltInComponent(tag)
if (builtIn) {
// built-ins are simply fallthroughs / have special handling during ssr
// so we don't need to import their runtime equivalents
if (!ssr) context.helper(builtIn)
return builtIn
}
// 3. user component (from setup bindings)
// this is skipped in browser build since browser builds do not perform
// binding analysis.
if (!__BROWSER__) {
const fromSetup = resolveSetupReference(tag, context)
if (fromSetup) {
return fromSetup
}
const dotIndex = tag.indexOf('.')
if (dotIndex > 0) {
const ns = resolveSetupReference(tag.slice(0, dotIndex), context)
if (ns) {
return ns + tag.slice(dotIndex)
}
}
}
// 4. Self referencing component (inferred from filename)
if (
!__BROWSER__ &&
context.selfName &&
capitalize(camelize(tag)) === context.selfName
) {
context.helper(RESOLVE_COMPONENT)
// codegen.ts has special check for __self postfix when generating
// component imports, which will pass additional `maybeSelfReference` flag
// to `resolveComponent`.
context.components.add(tag + `__self`)
return toValidAssetId(tag, `component`)
}
// 5. user component (resolve)
context.helper(RESOLVE_COMPONENT)
context.components.add(tag)
return toValidAssetId(tag, `component`)
}
function resolveSetupReference(name: string, context: TransformContext) {
const bindings = context.bindingMetadata
if (!bindings || bindings.__isScriptSetup === false) {
return
}
const camelName = camelize(name)
const PascalName = capitalize(camelName)
const checkType = (type: BindingTypes) => {
if (bindings[name] === type) {
return name
}
if (bindings[camelName] === type) {
return camelName
}
if (bindings[PascalName] === type) {
return PascalName
}
}
const fromConst =
checkType(BindingTypes.SETUP_CONST) ||
checkType(BindingTypes.SETUP_REACTIVE_CONST)
if (fromConst) {
return context.inline
? // in inline mode, const setup bindings (e.g. imports) can be used as-is
fromConst
: `$setup[${JSON.stringify(fromConst)}]`
}
const fromMaybeRef =
checkType(BindingTypes.SETUP_LET) ||
checkType(BindingTypes.SETUP_REF) ||
checkType(BindingTypes.SETUP_MAYBE_REF)
if (fromMaybeRef) {
return context.inline
? // setup scope bindings that may be refs need to be unrefed
`${context.helperString(UNREF)}(${fromMaybeRef})`
: `$setup[${JSON.stringify(fromMaybeRef)}]`
}
}
export type PropsExpression = ObjectExpression | CallExpression | ExpressionNode
export function buildProps(
node: ElementNode,
context: TransformContext,
props: ElementNode['props'] = node.props,
isComponent: boolean,
isDynamicComponent: boolean,
ssr = false
): {
props: PropsExpression | undefined
directives: DirectiveNode[]
patchFlag: number
dynamicPropNames: string[]
shouldUseBlock: boolean
} {
const { tag, loc: elementLoc, children } = node
let properties: ObjectExpression['properties'] = []
const mergeArgs: PropsExpression[] = []
const runtimeDirectives: DirectiveNode[] = []
const hasChildren = children.length > 0
let shouldUseBlock = false
// patchFlag analysis
let patchFlag = 0
let hasRef = false
let hasClassBinding = false
let hasStyleBinding = false
let hasHydrationEventBinding = false
let hasDynamicKeys = false
let hasVnodeHook = false
const dynamicPropNames: string[] = []
const analyzePatchFlag = ({ key, value }: Property) => {
if (isStaticExp(key)) {
const name = key.content
const isEventHandler = isOn(name)
if (
isEventHandler &&
(!isComponent || isDynamicComponent) &&
// omit the flag for click handlers because hydration gives click
// dedicated fast path.
name.toLowerCase() !== 'onclick' &&
// omit v-model handlers
name !== 'onUpdate:modelValue' &&
// omit onVnodeXXX hooks
!isReservedProp(name)
) {
hasHydrationEventBinding = true
}
if (isEventHandler && isReservedProp(name)) {
hasVnodeHook = true
}
if (
value.type === NodeTypes.JS_CACHE_EXPRESSION ||
((value.type === NodeTypes.SIMPLE_EXPRESSION ||
value.type === NodeTypes.COMPOUND_EXPRESSION) &&
getConstantType(value, context) > 0)
) {
// skip if the prop is a cached handler or has constant value
return
}
if (name === 'ref') {
hasRef = true
} else if (name === 'class') {
hasClassBinding = true
} else if (name === 'style') {
hasStyleBinding = true
} else if (name !== 'key' && !dynamicPropNames.includes(name)) {
dynamicPropNames.push(name)
}
// treat the dynamic class and style binding of the component as dynamic props
if (
isComponent &&
(name === 'class' || name === 'style') &&
!dynamicPropNames.includes(name)
) {
dynamicPropNames.push(name)
}
} else {
hasDynamicKeys = true
}
}
for (let i = 0; i < props.length; i++) {
// static attribute
const prop = props[i]
if (prop.type === NodeTypes.ATTRIBUTE) {
const { loc, name, value } = prop
let isStatic = true
if (name === 'ref') {
hasRef = true
Iif (context.scopes.vFor > 0) {
properties.push(
createObjectProperty(
createSimpleExpression('ref_for', true),
createSimpleExpression('true')
)
)
}
// in inline mode there is no setupState object, so we can't use string
// keys to set the ref. Instead, we need to transform it to pass the
// actual ref instead.
if (
!__BROWSER__ &&
value &&
context.inline &&
context.bindingMetadata[value.content]
) {
isStatic = false
properties.push(
createObjectProperty(
createSimpleExpression('ref_key', true),
createSimpleExpression(value.content, true, value.loc)
)
)
}
}
// skip is on <component>, or is="vue:xxx"
if (
name === 'is' &&
(isComponentTag(tag) ||
(value && value.content.startsWith('vue:')) ||
(__COMPAT__ &&
isCompatEnabled(
CompilerDeprecationTypes.COMPILER_IS_ON_ELEMENT,
context
)))
) {
continue
}
properties.push(
createObjectProperty(
createSimpleExpression(
name,
true,
getInnerRange(loc, 0, name.length)
),
createSimpleExpression(
value ? value.content : '',
isStatic,
value ? value.loc : loc
)
)
)
} else {
// directives
const { name, arg, exp, loc } = prop
const isVBind = name === 'bind'
const isVOn = name === 'on'
// skip v-slot - it is handled by its dedicated transform.
if (name === 'slot') {
if (!isComponent) {
context.onError(
createCompilerError(ErrorCodes.X_V_SLOT_MISPLACED, loc)
)
}
continue
}
// skip v-once/v-memo - they are handled by dedicated transforms.
if (name === 'once' || name === 'memo') {
continue
}
// skip v-is and :is on <component>
if (
name === 'is' ||
(isVBind &&
isStaticArgOf(arg, 'is') &&
(isComponentTag(tag) ||
(__COMPAT__ &&
isCompatEnabled(
CompilerDeprecationTypes.COMPILER_IS_ON_ELEMENT,
context
))))
) {
continue
}
// skip v-on in SSR compilation
if (isVOn && ssr) {
continue
}
if (
// #938: elements with dynamic keys should be forced into blocks
(isVBind && isStaticArgOf(arg, 'key')) ||
// inline before-update hooks need to force block so that it is invoked
// before children
(isVOn && hasChildren && isStaticArgOf(arg, 'vue:before-update'))
) {
shouldUseBlock = true
}
Iif (isVBind && isStaticArgOf(arg, 'ref') && context.scopes.vFor > 0) {
properties.push(
createObjectProperty(
createSimpleExpression('ref_for', true),
createSimpleExpression('true')
)
)
}
// special case for v-bind and v-on with no argument
if (!arg && (isVBind || isVOn)) {
hasDynamicKeys = true
if (exp) {
if (properties.length) {
mergeArgs.push(
createObjectExpression(dedupeProperties(properties), elementLoc)
)
properties = []
}
if (isVBind) {
if (__COMPAT__) {
// 2.x v-bind object order compat
if (__DEV__) {
const hasOverridableKeys = mergeArgs.some(arg => {
if (arg.type === NodeTypes.JS_OBJECT_EXPRESSION) {
return arg.properties.some(({ key }) => {
if (
key.type !== NodeTypes.SIMPLE_EXPRESSION ||
!key.isStatic
) {
return true
}
return (
key.content !== 'class' &&
key.content !== 'style' &&
!isOn(key.content)
)
})
} else {
// dynamic expression
return true
}
})
if (hasOverridableKeys) {
checkCompatEnabled(
CompilerDeprecationTypes.COMPILER_V_BIND_OBJECT_ORDER,
context,
loc
)
}
}
if (
isCompatEnabled(
CompilerDeprecationTypes.COMPILER_V_BIND_OBJECT_ORDER,
context
)
) {
mergeArgs.unshift(exp)
continue
}
}
mergeArgs.push(exp)
} else {
// v-on="obj" -> toHandlers(obj)
mergeArgs.push({
type: NodeTypes.JS_CALL_EXPRESSION,
loc,
callee: context.helper(TO_HANDLERS),
arguments: [exp]
})
}
} else {
context.onError(
createCompilerError(
isVBind
? ErrorCodes.X_V_BIND_NO_EXPRESSION
: ErrorCodes.X_V_ON_NO_EXPRESSION,
loc
)
)
}
continue
}
const directiveTransform = context.directiveTransforms[name]
if (directiveTransform) {
// has built-in directive transform.
const { props, needRuntime } = directiveTransform(prop, node, context)
!ssr && props.forEach(analyzePatchFlag)
properties.push(...props)
if (needRuntime) {
runtimeDirectives.push(prop)
if (isSymbol(needRuntime)) {
directiveImportMap.set(prop, needRuntime)
}
}
} else if (!isBuiltInDirective(name)) {
// no built-in transform, this is a user custom directive.
runtimeDirectives.push(prop)
// custom dirs may use beforeUpdate so they need to force blocks
// to ensure before-update gets called before children update
if (hasChildren) {
shouldUseBlock = true
}
}
}
}
let propsExpression: PropsExpression | undefined = undefined
// has v-bind="object" or v-on="object", wrap with mergeProps
if (mergeArgs.length) {
if (properties.length) {
mergeArgs.push(
createObjectExpression(dedupeProperties(properties), elementLoc)
)
}
if (mergeArgs.length > 1) {
propsExpression = createCallExpression(
context.helper(MERGE_PROPS),
mergeArgs,
elementLoc
)
} else {
// single v-bind with nothing else - no need for a mergeProps call
propsExpression = mergeArgs[0]
}
} else if (properties.length) {
propsExpression = createObjectExpression(
dedupeProperties(properties),
elementLoc
)
}
// patchFlag analysis
if (hasDynamicKeys) {
patchFlag |= PatchFlags.FULL_PROPS
} else {
if (hasClassBinding && !isComponent) {
patchFlag |= PatchFlags.CLASS
}
if (hasStyleBinding && !isComponent) {
patchFlag |= PatchFlags.STYLE
}
if (dynamicPropNames.length) {
patchFlag |= PatchFlags.PROPS
}
if (hasHydrationEventBinding) {
patchFlag |= PatchFlags.HYDRATE_EVENTS
}
}
if (
!shouldUseBlock &&
(patchFlag === 0 || patchFlag === PatchFlags.HYDRATE_EVENTS) &&
(hasRef || hasVnodeHook || runtimeDirectives.length > 0)
) {
patchFlag |= PatchFlags.NEED_PATCH
}
// pre-normalize props, SSR is skipped for now
if (!context.inSSR && propsExpression) {
switch (propsExpression.type) {
case NodeTypes.JS_OBJECT_EXPRESSION:
// means that there is no v-bind,
// but still need to deal with dynamic key binding
let classKeyIndex = -1
let styleKeyIndex = -1
let hasDynamicKey = false
for (let i = 0; i < propsExpression.properties.length; i++) {
const key = propsExpression.properties[i].key
if (isStaticExp(key)) {
if (key.content === 'class') {
classKeyIndex = i
} else if (key.content === 'style') {
styleKeyIndex = i
}
} else if (!key.isHandlerKey) {
hasDynamicKey = true
}
}
const classProp = propsExpression.properties[classKeyIndex]
const styleProp = propsExpression.properties[styleKeyIndex]
// no dynamic key
if (!hasDynamicKey) {
if (classProp && !isStaticExp(classProp.value)) {
classProp.value = createCallExpression(
context.helper(NORMALIZE_CLASS),
[classProp.value]
)
}
if (
styleProp &&
// the static style is compiled into an object,
// so use `hasStyleBinding` to ensure that it is a dynamic style binding
(hasStyleBinding ||
(styleProp.value.type === NodeTypes.SIMPLE_EXPRESSION &&
styleProp.value.content.trim()[0] === `[`) ||
// v-bind:style and style both exist,
// v-bind:style with static literal object
styleProp.value.type === NodeTypes.JS_ARRAY_EXPRESSION)
) {
styleProp.value = createCallExpression(
context.helper(NORMALIZE_STYLE),
[styleProp.value]
)
}
} else {
// dynamic key binding, wrap with `normalizeProps`
propsExpression = createCallExpression(
context.helper(NORMALIZE_PROPS),
[propsExpression]
)
}
break
case NodeTypes.JS_CALL_EXPRESSION:
// mergeProps call, do nothing
break
default:
// single v-bind
propsExpression = createCallExpression(
context.helper(NORMALIZE_PROPS),
[
createCallExpression(context.helper(GUARD_REACTIVE_PROPS), [
propsExpression
])
]
)
break
}
}
return {
props: propsExpression,
directives: runtimeDirectives,
patchFlag,
dynamicPropNames,
shouldUseBlock
}
}
// Dedupe props in an object literal.
// Literal duplicated attributes would have been warned during the parse phase,
// however, it's possible to encounter duplicated `onXXX` handlers with different
// modifiers. We also need to merge static and dynamic class / style attributes.
// - onXXX handlers / style: merge into array
// - class: merge into single expression with concatenation
function dedupeProperties(properties: Property[]): Property[] {
const knownProps: Map<string, Property> = new Map()
const deduped: Property[] = []
for (let i = 0; i < properties.length; i++) {
const prop = properties[i]
// dynamic keys are always allowed
if (prop.key.type === NodeTypes.COMPOUND_EXPRESSION || !prop.key.isStatic) {
deduped.push(prop)
continue
}
const name = prop.key.content
const existing = knownProps.get(name)
if (existing) {
if (name === 'style' || name === 'class' || isOn(name)) {
mergeAsArray(existing, prop)
}
// unexpected duplicate, should have emitted error during parse
} else {
knownProps.set(name, prop)
deduped.push(prop)
}
}
return deduped
}
function mergeAsArray(existing: Property, incoming: Property) {
if (existing.value.type === NodeTypes.JS_ARRAY_EXPRESSION) {
existing.value.elements.push(incoming.value)
} else {
existing.value = createArrayExpression(
[existing.value, incoming.value],
existing.loc
)
}
}
export function buildDirectiveArgs(
dir: DirectiveNode,
context: TransformContext
): ArrayExpression {
const dirArgs: ArrayExpression['elements'] = []
const runtime = directiveImportMap.get(dir)
if (runtime) {
// built-in directive with runtime
dirArgs.push(context.helperString(runtime))
} else {
// user directive.
// see if we have directives exposed via <script setup>
const fromSetup =
!__BROWSER__ && resolveSetupReference('v-' + dir.name, context)
if (fromSetup) {
dirArgs.push(fromSetup)
} else {
// inject statement for resolving directive
context.helper(RESOLVE_DIRECTIVE)
context.directives.add(dir.name)
dirArgs.push(toValidAssetId(dir.name, `directive`))
}
}
const { loc } = dir
if (dir.exp) dirArgs.push(dir.exp)
if (dir.arg) {
Iif (!dir.exp) {
dirArgs.push(`void 0`)
}
dirArgs.push(dir.arg)
}
if (Object.keys(dir.modifiers).length) {
if (!dir.arg) {
Iif (!dir.exp) {
dirArgs.push(`void 0`)
}
dirArgs.push(`void 0`)
}
const trueExpression = createSimpleExpression(`true`, false, loc)
dirArgs.push(
createObjectExpression(
dir.modifiers.map(modifier =>
createObjectProperty(modifier, trueExpression)
),
loc
)
)
}
return createArrayExpression(dirArgs, dir.loc)
}
function stringifyDynamicPropNames(props: string[]): string {
let propsNamesString = `[`
for (let i = 0, l = props.length; i < l; i++) {
propsNamesString += JSON.stringify(props[i])
if (i < l - 1) propsNamesString += ', '
}
return propsNamesString + `]`
}
function isComponentTag(tag: string) {
return tag === 'component' || tag === 'Component'
}
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