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Node,
Identifier,
BlockStatement,
CallExpression,
ObjectPattern,
ArrayPattern,
Program,
VariableDeclarator,
Expression,
VariableDeclaration,
ImportDeclaration,
ImportSpecifier,
ImportDefaultSpecifier,
ImportNamespaceSpecifier
} from '@babel/types'
import MagicString, { SourceMap } from 'magic-string'
import { walk } from 'estree-walker'
import {
extractIdentifiers,
isFunctionType,
isInDestructureAssignment,
isReferencedIdentifier,
isStaticProperty,
walkFunctionParams
} from '@vue/compiler-core'
import { parse, ParserPlugin } from '@babel/parser'
import { hasOwn, isArray, isString, genPropsAccessExp } from '@vue/shared'
const CONVERT_SYMBOL = '$'
const ESCAPE_SYMBOL = '$$'
const IMPORT_SOURCE = 'vue/macros'
const shorthands = ['ref', 'computed', 'shallowRef', 'toRef', 'customRef']
const transformCheckRE = /[^\w]\$(?:\$|ref|computed|shallowRef)?\s*(\(|\<)/
export function shouldTransform(src: string): boolean {
return transformCheckRE.test(src)
}
interface Binding {
isConst?: boolean
isProp?: boolean
}
type Scope = Record<string, Binding | false>
export interface RefTransformOptions {
filename?: string
sourceMap?: boolean
parserPlugins?: ParserPlugin[]
importHelpersFrom?: string
}
export interface RefTransformResults {
code: string
map: SourceMap | null
rootRefs: string[]
importedHelpers: string[]
}
export interface ImportBinding {
local: string
imported: string
source: string
specifier: ImportSpecifier | ImportDefaultSpecifier | ImportNamespaceSpecifier
}
export function transform(
src: string,
{
filename,
sourceMap,
parserPlugins,
importHelpersFrom = 'vue'
}: RefTransformOptions = {}
): RefTransformResults {
const plugins: ParserPlugin[] = parserPlugins || []
Iif (filename) {
Iif (/\.tsx?$/.test(filename)) {
plugins.push('typescript')
}
Iif (filename.endsWith('x')) {
plugins.push('jsx')
}
}
const ast = parse(src, {
sourceType: 'module',
plugins
})
const s = new MagicString(src)
const res = transformAST(ast.program, s, 0)
// inject helper imports
if (res.importedHelpers.length) {
s.prepend(
`import { ${res.importedHelpers
.map(h => `${h} as _${h}`)
.join(', ')} } from '${importHelpersFrom}'\n`
)
}
return {
...res,
code: s.toString(),
map: sourceMap
? s.generateMap({
source: filename,
hires: true,
includeContent: true
})
: null
}
}
export function transformAST(
ast: Program,
s: MagicString,
offset = 0,
knownRefs?: string[],
knownProps?: Record<
string, // public prop key
{
local: string // local identifier, may be different
default?: any
isConst?: boolean
}
>
): {
rootRefs: string[]
importedHelpers: string[]
} {
// TODO remove when out of experimental
warnExperimental()
const userImports: Record<string, ImportBinding> = Object.create(null)
for (const node of ast.body) {
if (node.type !== 'ImportDeclaration') continue
walkImportDeclaration(node)
}
// macro import handling
let convertSymbol: string | undefined
let escapeSymbol: string | undefined
for (const { local, imported, source, specifier } of Object.values(
userImports
)) {
if (source === IMPORT_SOURCE) {
Iif (imported === ESCAPE_SYMBOL) {
escapeSymbol = local
} else if (imported === CONVERT_SYMBOL) {
convertSymbol = local
} else Iif (imported !== local) {
error(
`macro imports for ref-creating methods do not support aliasing.`,
specifier
)
}
}
}
// default symbol
if (!convertSymbol && !userImports[CONVERT_SYMBOL]) {
convertSymbol = CONVERT_SYMBOL
}
if (!escapeSymbol && !userImports[ESCAPE_SYMBOL]) {
escapeSymbol = ESCAPE_SYMBOL
}
const importedHelpers = new Set<string>()
const rootScope: Scope = {}
const scopeStack: Scope[] = [rootScope]
let currentScope: Scope = rootScope
let escapeScope: CallExpression | undefined // inside $$()
const excludedIds = new WeakSet<Identifier>()
const parentStack: Node[] = []
const propsLocalToPublicMap: Record<string, string> = Object.create(null)
if (knownRefs) {
for (const key of knownRefs) {
rootScope[key] = {}
}
}
if (knownProps) {
for (const key in knownProps) {
const { local, isConst } = knownProps[key]
rootScope[local] = {
isProp: true,
isConst: !!isConst
}
propsLocalToPublicMap[local] = key
}
}
function walkImportDeclaration(node: ImportDeclaration) {
const source = node.source.value
if (source === IMPORT_SOURCE) {
s.remove(node.start! + offset, node.end! + offset)
}
for (const specifier of node.specifiers) {
const local = specifier.local.name
const imported =
(specifier.type === 'ImportSpecifier' &&
specifier.imported.type === 'Identifier' &&
specifier.imported.name) ||
'default'
userImports[local] = {
source,
local,
imported,
specifier
}
}
}
function isRefCreationCall(callee: string): string | false {
if (!convertSymbol || currentScope[convertSymbol] !== undefined) {
return false
}
if (callee === convertSymbol) {
return convertSymbol
}
if (callee[0] === '$' && shorthands.includes(callee.slice(1))) {
return callee
}
return false
}
function error(msg: string, node: Node): never {
const e = new Error(msg)
;(e as any).node = node
throw e
}
function helper(msg: string) {
importedHelpers.add(msg)
return `_${msg}`
}
function registerBinding(id: Identifier, binding?: Binding) {
excludedIds.add(id)
if (currentScope) {
currentScope[id.name] = binding ? binding : false
} else E{
error(
'registerBinding called without active scope, something is wrong.',
id
)
}
}
const registerRefBinding = (id: Identifier, isConst = false) =>
registerBinding(id, { isConst })
let tempVarCount = 0
function genTempVar() {
return `__$temp_${++tempVarCount}`
}
function snip(node: Node) {
return s.original.slice(node.start! + offset, node.end! + offset)
}
function walkScope(node: Program | BlockStatement, isRoot = false) {
for (const stmt of node.body) {
if (stmt.type === 'VariableDeclaration') {
walkVariableDeclaration(stmt, isRoot)
} else if (
stmt.type === 'FunctionDeclaration' ||
stmt.type === 'ClassDeclaration'
) {
Iif (stmt.declare || !stmt.id) continue
registerBinding(stmt.id)
} else if (
(stmt.type === 'ForOfStatement' || stmt.type === 'ForInStatement') &&
stmt.left.type === 'VariableDeclaration'
) {
walkVariableDeclaration(stmt.left)
} else if (
stmt.type === 'ExportNamedDeclaration' &&
stmt.declaration &&
stmt.declaration.type === 'VariableDeclaration'
) {
walkVariableDeclaration(stmt.declaration, isRoot)
} else if (
stmt.type === 'LabeledStatement' &&
stmt.body.type === 'VariableDeclaration'
) {
walkVariableDeclaration(stmt.body, isRoot)
}
}
}
function walkVariableDeclaration(stmt: VariableDeclaration, isRoot = false) {
Iif (stmt.declare) {
return
}
for (const decl of stmt.declarations) {
let refCall
const isCall =
decl.init &&
decl.init.type === 'CallExpression' &&
decl.init.callee.type === 'Identifier'
if (
isCall &&
(refCall = isRefCreationCall((decl as any).init.callee.name))
) {
processRefDeclaration(
refCall,
decl.id,
decl.init as CallExpression,
stmt.kind === 'const'
)
} else {
const isProps =
isRoot && isCall && (decl as any).init.callee.name === 'defineProps'
for (const id of extractIdentifiers(decl.id)) {
if (isProps) {
// for defineProps destructure, only exclude them since they
// are already passed in as knownProps
excludedIds.add(id)
} else {
registerBinding(id)
}
}
}
}
}
function processRefDeclaration(
method: string,
id: VariableDeclarator['id'],
call: CallExpression,
isConst: boolean
) {
excludedIds.add(call.callee as Identifier)
if (method === convertSymbol) {
// $
// remove macro
s.remove(call.callee.start! + offset, call.callee.end! + offset)
if (id.type === 'Identifier') {
// single variable
registerRefBinding(id, isConst)
} else if (id.type === 'ObjectPattern') {
processRefObjectPattern(id, call, isConst)
} else if (id.type === 'ArrayPattern') {
processRefArrayPattern(id, call, isConst)
}
} else {
// shorthands
if (id.type === 'Identifier') {
registerRefBinding(id, isConst)
// replace call
s.overwrite(
call.start! + offset,
call.start! + method.length + offset,
helper(method.slice(1))
)
} else {
error(`${method}() cannot be used with destructure patterns.`, call)
}
}
}
function processRefObjectPattern(
pattern: ObjectPattern,
call: CallExpression,
isConst: boolean,
tempVar?: string,
path: PathSegment[] = []
) {
if (!tempVar) {
tempVar = genTempVar()
// const { x } = $(useFoo()) --> const __$temp_1 = useFoo()
s.overwrite(pattern.start! + offset, pattern.end! + offset, tempVar)
}
let nameId: Identifier | undefined
for (const p of pattern.properties) {
let key: Expression | string | undefined
let defaultValue: Expression | undefined
if (p.type === 'ObjectProperty') {
if (p.key.start! === p.value.start!) {
// shorthand { foo }
nameId = p.key as Identifier
if (p.value.type === 'Identifier') {
// avoid shorthand value identifier from being processed
excludedIds.add(p.value)
} else if (
p.value.type === 'AssignmentPattern' &&
p.value.left.type === 'Identifier'
) {
// { foo = 1 }
excludedIds.add(p.value.left)
defaultValue = p.value.right
}
} else {
key = p.computed ? p.key : (p.key as Identifier).name
if (p.value.type === 'Identifier') {
// { foo: bar }
nameId = p.value
} else if (p.value.type === 'ObjectPattern') {
processRefObjectPattern(p.value, call, isConst, tempVar, [
...path,
key
])
} else if (p.value.type === 'ArrayPattern') {
processRefArrayPattern(p.value, call, isConst, tempVar, [
...path,
key
])
} else if (p.value.type === 'AssignmentPattern') {
if (p.value.left.type === 'Identifier') {
// { foo: bar = 1 }
nameId = p.value.left
defaultValue = p.value.right
} else if (p.value.left.type === 'ObjectPattern') {
processRefObjectPattern(p.value.left, call, isConst, tempVar, [
...path,
[key, p.value.right]
])
} else Eif (p.value.left.type === 'ArrayPattern') {
processRefArrayPattern(p.value.left, call, isConst, tempVar, [
...path,
[key, p.value.right]
])
} else {
// MemberExpression case is not possible here, ignore
}
}
}
} else {
// rest element { ...foo }
error(`reactivity destructure does not support rest elements.`, p)
}
if (nameId) {
registerRefBinding(nameId, isConst)
// inject toRef() after original replaced pattern
const source = pathToString(tempVar, path)
const keyStr = isString(key)
? `'${key}'`
: key
? snip(key)
: `'${nameId.name}'`
const defaultStr = defaultValue ? `, ${snip(defaultValue)}` : ``
s.appendLeft(
call.end! + offset,
`,\n ${nameId.name} = ${helper(
'toRef'
)}(${source}, ${keyStr}${defaultStr})`
)
}
}
if (nameId) {
s.appendLeft(call.end! + offset, ';')
}
}
function processRefArrayPattern(
pattern: ArrayPattern,
call: CallExpression,
isConst: boolean,
tempVar?: string,
path: PathSegment[] = []
) {
if (!tempVar) {
// const [x] = $(useFoo()) --> const __$temp_1 = useFoo()
tempVar = genTempVar()
s.overwrite(pattern.start! + offset, pattern.end! + offset, tempVar)
}
let nameId: Identifier | undefined
for (let i = 0; i < pattern.elements.length; i++) {
const e = pattern.elements[i]
Iif (!e) continue
let defaultValue: Expression | undefined
if (e.type === 'Identifier') {
// [a] --> [__a]
nameId = e
} else if (e.type === 'AssignmentPattern') {
// [a = 1]
nameId = e.left as Identifier
defaultValue = e.right
} else if (e.type === 'RestElement') {
// [...a]
error(`reactivity destructure does not support rest elements.`, e)
} else if (e.type === 'ObjectPattern') {
processRefObjectPattern(e, call, isConst, tempVar, [...path, i])
} else IEif (e.type === 'ArrayPattern') {
processRefArrayPattern(e, call, isConst, tempVar, [...path, i])
}
if (nameId) {
registerRefBinding(nameId, isConst)
// inject toRef() after original replaced pattern
const source = pathToString(tempVar, path)
const defaultStr = defaultValue ? `, ${snip(defaultValue)}` : ``
s.appendLeft(
call.end! + offset,
`,\n ${nameId.name} = ${helper(
'toRef'
)}(${source}, ${i}${defaultStr})`
)
}
}
if (nameId) {
s.appendLeft(call.end! + offset, ';')
}
}
type PathSegmentAtom = Expression | string | number
type PathSegment =
| PathSegmentAtom
| [PathSegmentAtom, Expression /* default value */]
function pathToString(source: string, path: PathSegment[]): string {
if (path.length) {
for (const seg of path) {
if (isArray(seg)) {
source = `(${source}${segToString(seg[0])} || ${snip(seg[1])})`
} else {
source += segToString(seg)
}
}
}
return source
}
function segToString(seg: PathSegmentAtom): string {
if (typeof seg === 'number') {
return `[${seg}]`
} else if (typeof seg === 'string') {
return `.${seg}`
} else E{
return snip(seg)
}
}
function rewriteId(
scope: Scope,
id: Identifier,
parent: Node,
parentStack: Node[]
): boolean {
if (hasOwn(scope, id.name)) {
const binding = scope[id.name]
if (binding) {
if (
binding.isConst &&
((parent.type === 'AssignmentExpression' && id === parent.left) ||
parent.type === 'UpdateExpression')
) {
error(`Assignment to constant variable.`, id)
}
const { isProp } = binding
if (isStaticProperty(parent) && parent.shorthand) {
// let binding used in a property shorthand
// skip for destructure patterns
if (
!(parent as any).inPattern ||
isInDestructureAssignment(parent, parentStack)
) {
if (isProp) {
if (escapeScope) {
// prop binding in $$()
// { prop } -> { prop: __props_prop }
registerEscapedPropBinding(id)
s.appendLeft(
id.end! + offset,
`: __props_${propsLocalToPublicMap[id.name]}`
)
} else E{
// { prop } -> { prop: __props.prop }
s.appendLeft(
id.end! + offset,
`: ${genPropsAccessExp(propsLocalToPublicMap[id.name])}`
)
}
} else {
// { foo } -> { foo: foo.value }
s.appendLeft(id.end! + offset, `: ${id.name}.value`)
}
}
} else {
if (isProp) {
if (escapeScope) {
// x --> __props_x
registerEscapedPropBinding(id)
s.overwrite(
id.start! + offset,
id.end! + offset,
`__props_${propsLocalToPublicMap[id.name]}`
)
} else {
// x --> __props.x
s.overwrite(
id.start! + offset,
id.end! + offset,
genPropsAccessExp(propsLocalToPublicMap[id.name])
)
}
} else {
// x --> x.value
s.appendLeft(id.end! + offset, '.value')
}
}
}
return true
}
return false
}
const propBindingRefs: Record<string, true> = {}
function registerEscapedPropBinding(id: Identifier) {
if (!propBindingRefs.hasOwnProperty(id.name)) {
propBindingRefs[id.name] = true
const publicKey = propsLocalToPublicMap[id.name]
s.prependRight(
offset,
`const __props_${publicKey} = ${helper(
`toRef`
)}(__props, '${publicKey}');\n`
)
}
}
// check root scope first
walkScope(ast, true)
;(walk as any)(ast, {
enter(node: Node, parent?: Node) {
parent && parentStack.push(parent)
// function scopes
if (isFunctionType(node)) {
scopeStack.push((currentScope = {}))
walkFunctionParams(node, registerBinding)
if (node.body.type === 'BlockStatement') {
walkScope(node.body)
}
return
}
// catch param
if (node.type === 'CatchClause') {
scopeStack.push((currentScope = {}))
if (node.param && node.param.type === 'Identifier') {
registerBinding(node.param)
}
walkScope(node.body)
return
}
// non-function block scopes
if (node.type === 'BlockStatement' && !isFunctionType(parent!)) {
scopeStack.push((currentScope = {}))
walkScope(node)
return
}
// skip type nodes
if (
parent &&
parent.type.startsWith('TS') &&
parent.type !== 'TSAsExpression' &&
parent.type !== 'TSNonNullExpression' &&
parent.type !== 'TSTypeAssertion'
) {
return this.skip()
}
if (node.type === 'Identifier') {
const binding = rootScope[node.name]
if (
// if inside $$(), skip unless this is a destructured prop binding
!(escapeScope && (!binding || !binding.isProp)) &&
isReferencedIdentifier(node, parent!, parentStack) &&
!excludedIds.has(node)
) {
// walk up the scope chain to check if id should be appended .value
let i = scopeStack.length
while (i--) {
if (rewriteId(scopeStack[i], node, parent!, parentStack)) {
return
}
}
}
}
if (node.type === 'CallExpression' && node.callee.type === 'Identifier') {
const callee = node.callee.name
const refCall = isRefCreationCall(callee)
if (refCall && (!parent || parent.type !== 'VariableDeclarator')) {
return error(
`${refCall} can only be used as the initializer of ` +
`a variable declaration.`,
node
)
}
if (
escapeSymbol &&
currentScope[escapeSymbol] === undefined &&
callee === escapeSymbol
) {
escapeScope = node
s.remove(node.callee.start! + offset, node.callee.end! + offset)
if (parent?.type === 'ExpressionStatement') {
// edge case where the call expression is an expression statement
// if its own - prepend semicolon to avoid it being parsed as
// function invocation of previous line
let i =
(node.leadingComments
? node.leadingComments[0].start
: node.start)! + offset
while (i--) {
const char = s.original.charAt(i)
if (char === '\n') {
// only insert semi if it's actually the fisrt thign after
// newline
s.prependRight(node.start! + offset, ';')
break
} else if (!/\s/.test(char)) {
break
}
}
}
}
// TODO remove when out of experimental
Iif (callee === '$raw') {
error(
`$raw() has been replaced by $$(). ` +
`See ${RFC_LINK} for latest updates.`,
node
)
}
Iif (callee === '$fromRef') {
error(
`$fromRef() has been replaced by $(). ` +
`See ${RFC_LINK} for latest updates.`,
node
)
}
}
},
leave(node: Node, parent?: Node) {
parent && parentStack.pop()
if (
(node.type === 'BlockStatement' && !isFunctionType(parent!)) ||
isFunctionType(node)
) {
scopeStack.pop()
currentScope = scopeStack[scopeStack.length - 1] || null
}
if (node === escapeScope) {
escapeScope = undefined
}
}
})
return {
rootRefs: Object.keys(rootScope).filter(key => {
const binding = rootScope[key]
return binding && !binding.isProp
}),
importedHelpers: [...importedHelpers]
}
}
const RFC_LINK = `https://github.com/vuejs/rfcs/discussions/369`
const hasWarned: Record<string, boolean> = {}
function warnExperimental() {
// eslint-disable-next-line
if (typeof window !== 'undefined') {
return
}
warnOnce(
`Reactivity transform is an experimental feature.\n` +
`Experimental features may change behavior between patch versions.\n` +
`It is recommended to pin your vue dependencies to exact versions to avoid breakage.\n` +
`You can follow the proposal's status at ${RFC_LINK}.`
)
}
function warnOnce(msg: string) {
const isNodeProd =
typeof process !== 'undefined' && process.env.NODE_ENV === 'production'
Iif (!isNodeProd && !__TEST__ && !hasWarned[msg]) {
hasWarned[msg] = true
warn(msg)
}
}
function warn(msg: string) {
console.warn(
`\x1b[1m\x1b[33m[@vue/reactivity-transform]\x1b[0m\x1b[33m ${msg}\x1b[0m\n`
)
}
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