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332x 336x 336x 1628x 1628x 1628x 1292x 8x 1628x 4x 4x 1628x 594x 594x 594x 491x 491x 594x 1030x 178x 1030x 78x 1030x 75x 3x 75x 72x 43x 72x 72x 952x 61x 61x 61x 6x 61x 61x 877x 2x 2x 2x 816x 4x 3x 4x 4x 1628x 336x 1608x 1608x 14x 18x 18x 18x 18x 18x 14x 1608x 336x 336x 2x 772x 772x 772x 772x 772x 772x 4x 4x 772x 768x 418x 418x 350x 771x 772x 57x 772x 772x 2x 772x 291x 291x 2x 63x 63x 63x 63x 63x 63x 63x 23x 23x 50x 50x 5x 50x 18x 18x 50x 23x 58x 58x 2x 61x 61x 66x 66x 2x 66x 59x 59x 66x 59x 59x 2x 81x 81x 81x 81x 41x 45x 45x 41x 81x 2x 61x 61x 61x 61x 35x 5x 5x 5x 5x 5x 5x 5x 30x 30x 30x 30x 4x 4x 35x 61x 844x 844x 844x 844x 844x 842x 840x 844x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 4x 4x 4x 4x 4x 4x 8x 2x 203x 203x 203x 203x 203x 114x 114x 203x 203x 61x 82x 2x 82x 80x 80x 82x 61x 203x 2x 2x 2x 2x 203x 203x 26x 26x 203x 203x 203x 58x 58x 4x 58x 54x 54x 58x 54x 54x 54x 54x 54x 54x 54x 54x 54x 54x 2x 4894x 4894x 2x 606x 603x 167x 2x 413x 768x 768x 768x 768x 90x 48x 48x 42x 768x 768x 27x 768x 19x 768x 768x 768x 768x 4x 4x 4x 768x 317x 194x 194x 317x 768x 768x 768x 768x 768x 19x 768x 54x 768x 768x 1x 768x 4x 768x 768x 768x 768x 3x 768x 768x 768x 768x 768x 768x 10x 768x 768x 768x 768x 2x 768x 768x 768x 768x 768x 218x 218x 2x 2x 2x 2x 2x 2x 2x 2x 1179x 13x 1179x 1166x 1166x 1179x | // should only use types from @babel/types // do not import runtime methods import type { BlockStatement, ForInStatement, ForOfStatement, ForStatement, Function, Identifier, Node, ObjectProperty, Program, } from '@babel/types' import { walk } from 'estree-walker' /** * Return value indicates whether the AST walked can be a constant */ export function walkIdentifiers( root: Node, onIdentifier: ( node: Identifier, parent: Node | null, parentStack: Node[], isReference: boolean, isLocal: boolean, ) => void, includeAll = false, parentStack: Node[] = [], knownIds: Record<string, number> = Object.create(null), ): void { if (__BROWSER__) { return } const rootExp = root.type === 'Program' ? root.body[0].type === 'ExpressionStatement' && root.body[0].expression : root walk(root, { enter(node: Node & { scopeIds?: Set<string> }, parent: Node | null) { parent && parentStack.push(parent) if ( parent && parent.type.startsWith('TS') && !TS_NODE_TYPES.includes(parent.type) ) { return this.skip() } if (node.type === 'Identifier') { const isLocal = !!knownIds[node.name] const isRefed = isReferencedIdentifier(node, parent, parentStack) if (includeAll || (isRefed && !isLocal)) { onIdentifier(node, parent, parentStack, isRefed, isLocal) } } else if ( node.type === 'ObjectProperty' && // eslint-disable-next-line no-restricted-syntax parent?.type === 'ObjectPattern' ) { // mark property in destructure pattern ;(node as any).inPattern = true } else if (isFunctionType(node)) { if (node.scopeIds) { node.scopeIds.forEach(id => markKnownIds(id, knownIds)) } else { // walk function expressions and add its arguments to known identifiers // so that we don't prefix them walkFunctionParams(node, id => markScopeIdentifier(node, id, knownIds), ) } } else if (node.type === 'BlockStatement') { if (node.scopeIds) { node.scopeIds.forEach(id => markKnownIds(id, knownIds)) } else { // #3445 record block-level local variables walkBlockDeclarations(node, id => markScopeIdentifier(node, id, knownIds), ) } } else if (node.type === 'CatchClause' && node.param) { for (const id of extractIdentifiers(node.param)) { markScopeIdentifier(node, id, knownIds) } } else if (isForStatement(node)) { walkForStatement(node, false, id => markScopeIdentifier(node, id, knownIds), ) } }, leave(node: Node & { scopeIds?: Set<string> }, parent: Node | null) { parent && parentStack.pop() if (node !== rootExp && node.scopeIds) { for (const id of node.scopeIds) { knownIds[id]-- if (knownIds[id] === 0) { delete knownIds[id] } } } }, }) } export function isReferencedIdentifier( id: Identifier, parent: Node | null, parentStack: Node[], ): boolean { if (__BROWSER__) { return false } if (!parent) { return true } // is a special keyword but parsed as identifier if (id.name === 'arguments') { return false } if (isReferenced(id, parent)) { return true } // babel's isReferenced check returns false for ids being assigned to, so we // need to cover those cases here switch (parent.type) { case 'AssignmentExpression': case 'AssignmentPattern': return true case 'ObjectPattern': case 'ArrayPattern': return isInDestructureAssignment(parent, parentStack) } return false } export function isInDestructureAssignment( parent: Node, parentStack: Node[], ): boolean { if ( parent && (parent.type === 'ObjectProperty' || parent.type === 'ArrayPattern') ) { let i = parentStack.length while (i--) { const p = parentStack[i] if (p.type === 'AssignmentExpression') { return true } else if (p.type !== 'ObjectProperty' && !p.type.endsWith('Pattern')) { break } } } return false } export function isInNewExpression(parentStack: Node[]): boolean { let i = parentStack.length while (i--) { const p = parentStack[i] if (p.type === 'NewExpression') { return true } else if (p.type !== 'MemberExpression') { break } } return false } export function walkFunctionParams( node: Function, onIdent: (id: Identifier) => void, ): void { for (const p of node.params) { for (const id of extractIdentifiers(p)) { onIdent(id) } } } export function walkBlockDeclarations( block: BlockStatement | Program, onIdent: (node: Identifier) => void, ): void { for (const stmt of block.body) { if (stmt.type === 'VariableDeclaration') { if (stmt.declare) continue for (const decl of stmt.declarations) { for (const id of extractIdentifiers(decl.id)) { onIdent(id) } } } else if ( stmt.type === 'FunctionDeclaration' || stmt.type === 'ClassDeclaration' ) { if (stmt.declare || !stmt.id) continue onIdent(stmt.id) } else if (isForStatement(stmt)) { walkForStatement(stmt, true, onIdent) } } } function isForStatement( stmt: Node, ): stmt is ForStatement | ForOfStatement | ForInStatement { return ( stmt.type === 'ForOfStatement' || stmt.type === 'ForInStatement' || stmt.type === 'ForStatement' ) } function walkForStatement( stmt: ForStatement | ForOfStatement | ForInStatement, isVar: boolean, onIdent: (id: Identifier) => void, ) { const variable = stmt.type === 'ForStatement' ? stmt.init : stmt.left if ( variable && variable.type === 'VariableDeclaration' && (variable.kind === 'var' ? isVar : !isVar) ) { for (const decl of variable.declarations) { for (const id of extractIdentifiers(decl.id)) { onIdent(id) } } } } export function extractIdentifiers( param: Node, nodes: Identifier[] = [], ): Identifier[] { switch (param.type) { case 'Identifier': nodes.push(param) break case 'MemberExpression': let object: any = param while (object.type === 'MemberExpression') { object = object.object } nodes.push(object) break case 'ObjectPattern': for (const prop of param.properties) { if (prop.type === 'RestElement') { extractIdentifiers(prop.argument, nodes) } else { extractIdentifiers(prop.value, nodes) } } break case 'ArrayPattern': param.elements.forEach(element => { if (element) extractIdentifiers(element, nodes) }) break case 'RestElement': extractIdentifiers(param.argument, nodes) break case 'AssignmentPattern': extractIdentifiers(param.left, nodes) break } return nodes } function markKnownIds(name: string, knownIds: Record<string, number>) { if (name in knownIds) { knownIds[name]++ } else { knownIds[name] = 1 } } function markScopeIdentifier( node: Node & { scopeIds?: Set<string> }, child: Identifier, knownIds: Record<string, number>, ) { const { name } = child if (node.scopeIds && node.scopeIds.has(name)) { return } markKnownIds(name, knownIds) ;(node.scopeIds || (node.scopeIds = new Set())).add(name) } export const isFunctionType = (node: Node): node is Function => { return /Function(?:Expression|Declaration)$|Method$/.test(node.type) } export const isStaticProperty = (node: Node): node is ObjectProperty => node && (node.type === 'ObjectProperty' || node.type === 'ObjectMethod') && !node.computed export const isStaticPropertyKey = (node: Node, parent: Node): boolean => isStaticProperty(parent) && parent.key === node /** * Copied from https://github.com/babel/babel/blob/main/packages/babel-types/src/validators/isReferenced.ts * To avoid runtime dependency on @babel/types (which includes process references) * This file should not change very often in babel but we may need to keep it * up-to-date from time to time. * * https://github.com/babel/babel/blob/main/LICENSE * */ function isReferenced(node: Node, parent: Node, grandparent?: Node): boolean { switch (parent.type) { // yes: PARENT[NODE] // yes: NODE.child // no: parent.NODE case 'MemberExpression': case 'OptionalMemberExpression': if (parent.property === node) { return !!parent.computed } return parent.object === node case 'JSXMemberExpression': return parent.object === node // no: let NODE = init; // yes: let id = NODE; case 'VariableDeclarator': return parent.init === node // yes: () => NODE // no: (NODE) => {} case 'ArrowFunctionExpression': return parent.body === node // no: class { #NODE; } // no: class { get #NODE() {} } // no: class { #NODE() {} } // no: class { fn() { return this.#NODE; } } case 'PrivateName': return false // no: class { NODE() {} } // yes: class { [NODE]() {} } // no: class { foo(NODE) {} } case 'ClassMethod': case 'ClassPrivateMethod': case 'ObjectMethod': if (parent.key === node) { return !!parent.computed } return false // yes: { [NODE]: "" } // no: { NODE: "" } // depends: { NODE } // depends: { key: NODE } case 'ObjectProperty': if (parent.key === node) { return !!parent.computed } // parent.value === node return !grandparent || grandparent.type !== 'ObjectPattern' // no: class { NODE = value; } // yes: class { [NODE] = value; } // yes: class { key = NODE; } case 'ClassProperty': if (parent.key === node) { return !!parent.computed } return true case 'ClassPrivateProperty': return parent.key !== node // no: class NODE {} // yes: class Foo extends NODE {} case 'ClassDeclaration': case 'ClassExpression': return parent.superClass === node // yes: left = NODE; // no: NODE = right; case 'AssignmentExpression': return parent.right === node // no: [NODE = foo] = []; // yes: [foo = NODE] = []; case 'AssignmentPattern': return parent.right === node // no: NODE: for (;;) {} case 'LabeledStatement': return false // no: try {} catch (NODE) {} case 'CatchClause': return false // no: function foo(...NODE) {} case 'RestElement': return false case 'BreakStatement': case 'ContinueStatement': return false // no: function NODE() {} // no: function foo(NODE) {} case 'FunctionDeclaration': case 'FunctionExpression': return false // no: export NODE from "foo"; // no: export * as NODE from "foo"; case 'ExportNamespaceSpecifier': case 'ExportDefaultSpecifier': return false // no: export { foo as NODE }; // yes: export { NODE as foo }; // no: export { NODE as foo } from "foo"; case 'ExportSpecifier': // @ts-expect-error // eslint-disable-next-line no-restricted-syntax if (grandparent?.source) { return false } return parent.local === node // no: import NODE from "foo"; // no: import * as NODE from "foo"; // no: import { NODE as foo } from "foo"; // no: import { foo as NODE } from "foo"; // no: import NODE from "bar"; case 'ImportDefaultSpecifier': case 'ImportNamespaceSpecifier': case 'ImportSpecifier': return false // no: import "foo" assert { NODE: "json" } case 'ImportAttribute': return false // no: <div NODE="foo" /> case 'JSXAttribute': return false // no: [NODE] = []; // no: ({ NODE }) = []; case 'ObjectPattern': case 'ArrayPattern': return false // no: new.NODE // no: NODE.target case 'MetaProperty': return false // yes: type X = { someProperty: NODE } // no: type X = { NODE: OtherType } case 'ObjectTypeProperty': return parent.key !== node // yes: enum X { Foo = NODE } // no: enum X { NODE } case 'TSEnumMember': return parent.id !== node // yes: { [NODE]: value } // no: { NODE: value } case 'TSPropertySignature': if (parent.key === node) { return !!parent.computed } return true } return true } export const TS_NODE_TYPES: string[] = [ 'TSAsExpression', // foo as number 'TSTypeAssertion', // (<number>foo) 'TSNonNullExpression', // foo! 'TSInstantiationExpression', // foo<string> 'TSSatisfiesExpression', // foo satisfies T ] export function unwrapTSNode(node: Node): Node { if (TS_NODE_TYPES.includes(node.type)) { return unwrapTSNode((node as any).expression) } else { return node } } |