,\n startLoc: Position | undefined | null,\n isGenerator: boolean,\n isAsync: boolean,\n isPattern: boolean,\n isAccessor: boolean,\n refExpressionErrors?: ExpressionErrors | null,\n ): T {\n if ((prop as any).variance) {\n this.unexpected((prop as any).variance.loc.start);\n }\n delete (prop as any).variance;\n\n let typeParameters;\n\n // method shorthand\n if (this.match(tt.lt) && !isAccessor) {\n typeParameters = this.flowParseTypeParameterDeclaration();\n if (!this.match(tt.parenL)) this.unexpected();\n }\n\n const result = super.parseObjPropValue(\n prop,\n startLoc,\n isGenerator,\n isAsync,\n isPattern,\n isAccessor,\n refExpressionErrors,\n );\n\n // add typeParameters if we found them\n if (typeParameters) {\n // @ts-expect-error: refine typings\n (result.value || result).typeParameters = typeParameters;\n }\n return result;\n }\n\n parseFunctionParamType(param: N.Pattern): N.Pattern {\n if (this.eat(tt.question)) {\n if (param.type !== \"Identifier\") {\n this.raise(FlowErrors.PatternIsOptional, param);\n }\n if (this.isThisParam(param)) {\n this.raise(FlowErrors.ThisParamMayNotBeOptional, param);\n }\n\n (param as any as N.Identifier).optional = true;\n }\n if (this.match(tt.colon)) {\n param.typeAnnotation = this.flowParseTypeAnnotation();\n } else if (this.isThisParam(param)) {\n this.raise(FlowErrors.ThisParamAnnotationRequired, param);\n }\n\n if (this.match(tt.eq) && this.isThisParam(param)) {\n this.raise(FlowErrors.ThisParamNoDefault, param);\n }\n\n this.resetEndLocation(param);\n return param;\n }\n\n parseMaybeDefault(\n startLoc?: Position | null,\n left?: P | null,\n ): P | N.AssignmentPattern {\n const node = super.parseMaybeDefault(startLoc, left);\n\n if (\n node.type === \"AssignmentPattern\" &&\n node.typeAnnotation &&\n node.right.start < node.typeAnnotation.start\n ) {\n this.raise(FlowErrors.TypeBeforeInitializer, node.typeAnnotation);\n }\n\n return node;\n }\n\n checkImportReflection(node: Undone) {\n super.checkImportReflection(node);\n if (node.module && node.importKind !== \"value\") {\n this.raise(\n FlowErrors.ImportReflectionHasImportType,\n node.specifiers[0].loc.start,\n );\n }\n }\n\n parseImportSpecifierLocal<\n T extends\n | N.ImportSpecifier\n | N.ImportDefaultSpecifier\n | N.ImportNamespaceSpecifier,\n >(node: N.ImportDeclaration, specifier: Undone, type: T[\"type\"]): void {\n specifier.local = hasTypeImportKind(node)\n ? this.flowParseRestrictedIdentifier(\n /* liberal */ true,\n /* declaration */ true,\n )\n : this.parseIdentifier();\n\n node.specifiers.push(this.finishImportSpecifier(specifier, type));\n }\n\n isPotentialImportPhase(isExport: boolean): boolean {\n if (super.isPotentialImportPhase(isExport)) return true;\n if (this.isContextual(tt._type)) {\n if (!isExport) return true;\n const ch = this.lookaheadCharCode();\n return ch === charCodes.leftCurlyBrace || ch === charCodes.asterisk;\n }\n return !isExport && this.isContextual(tt._typeof);\n }\n\n applyImportPhase(\n node: Undone,\n isExport: boolean,\n phase: string | null,\n loc?: Position,\n ): void {\n super.applyImportPhase(node, isExport, phase, loc);\n if (isExport) {\n if (!phase && this.match(tt._default)) {\n // TODO: Align with our TS AST and always add .exportKind\n return;\n }\n (node as N.ExportNamedDeclaration).exportKind =\n phase === \"type\" ? phase : \"value\";\n } else {\n if (phase === \"type\" && this.match(tt.star)) this.unexpected();\n (node as N.ImportDeclaration).importKind =\n phase === \"type\" || phase === \"typeof\" ? phase : \"value\";\n }\n }\n\n // parse import-type/typeof shorthand\n parseImportSpecifier(\n specifier: any,\n importedIsString: boolean,\n isInTypeOnlyImport: boolean,\n // eslint-disable-next-line @typescript-eslint/no-unused-vars\n isMaybeTypeOnly: boolean,\n // eslint-disable-next-line @typescript-eslint/no-unused-vars\n bindingType: BindingFlag | undefined,\n ): N.ImportSpecifier {\n const firstIdent = specifier.imported;\n\n let specifierTypeKind = null;\n if (firstIdent.type === \"Identifier\") {\n if (firstIdent.name === \"type\") {\n specifierTypeKind = \"type\";\n } else if (firstIdent.name === \"typeof\") {\n specifierTypeKind = \"typeof\";\n }\n }\n\n let isBinding = false;\n if (this.isContextual(tt._as) && !this.isLookaheadContextual(\"as\")) {\n const as_ident = this.parseIdentifier(true);\n if (\n specifierTypeKind !== null &&\n !tokenIsKeywordOrIdentifier(this.state.type)\n ) {\n // `import {type as ,` or `import {type as }`\n specifier.imported = as_ident;\n specifier.importKind = specifierTypeKind;\n specifier.local = this.cloneIdentifier(as_ident);\n } else {\n // `import {type as foo`\n specifier.imported = firstIdent;\n specifier.importKind = null;\n specifier.local = this.parseIdentifier();\n }\n } else {\n if (\n specifierTypeKind !== null &&\n tokenIsKeywordOrIdentifier(this.state.type)\n ) {\n // `import {type foo`\n specifier.imported = this.parseIdentifier(true);\n specifier.importKind = specifierTypeKind;\n } else {\n if (importedIsString) {\n /*:: invariant(firstIdent instanceof N.StringLiteral) */\n throw this.raise(Errors.ImportBindingIsString, specifier, {\n importName: firstIdent.value,\n });\n }\n /*:: invariant(firstIdent instanceof N.Node) */\n specifier.imported = firstIdent;\n specifier.importKind = null;\n }\n\n if (this.eatContextual(tt._as)) {\n specifier.local = this.parseIdentifier();\n } else {\n isBinding = true;\n specifier.local = this.cloneIdentifier(specifier.imported);\n }\n }\n\n const specifierIsTypeImport = hasTypeImportKind(specifier);\n\n if (isInTypeOnlyImport && specifierIsTypeImport) {\n this.raise(FlowErrors.ImportTypeShorthandOnlyInPureImport, specifier);\n }\n\n if (isInTypeOnlyImport || specifierIsTypeImport) {\n this.checkReservedType(\n specifier.local.name,\n specifier.local.loc.start,\n /* declaration */ true,\n );\n }\n\n if (isBinding && !isInTypeOnlyImport && !specifierIsTypeImport) {\n this.checkReservedWord(\n specifier.local.name,\n specifier.loc.start,\n true,\n true,\n );\n }\n\n return this.finishImportSpecifier(specifier, \"ImportSpecifier\");\n }\n\n parseBindingAtom(): N.Pattern {\n switch (this.state.type) {\n case tt._this:\n // \"this\" may be the name of a parameter, so allow it.\n return this.parseIdentifier(/* liberal */ true);\n default:\n return super.parseBindingAtom();\n }\n }\n\n // parse function type parameters - function foo() {}\n parseFunctionParams(\n node: Undone,\n isConstructor: boolean,\n ): void {\n // @ts-expect-error kind may not index node\n const kind = node.kind;\n if (kind !== \"get\" && kind !== \"set\" && this.match(tt.lt)) {\n node.typeParameters = this.flowParseTypeParameterDeclaration();\n }\n super.parseFunctionParams(node, isConstructor);\n }\n\n // parse flow type annotations on variable declarator heads - let foo: string = bar\n parseVarId(\n decl: N.VariableDeclarator,\n kind: \"var\" | \"let\" | \"const\" | \"using\" | \"await using\",\n ): void {\n super.parseVarId(decl, kind);\n if (this.match(tt.colon)) {\n decl.id.typeAnnotation = this.flowParseTypeAnnotation();\n this.resetEndLocation(decl.id); // set end position to end of type\n }\n }\n\n // parse the return type of an async arrow function - let foo = (async (): number => {});\n parseAsyncArrowFromCallExpression(\n node: N.ArrowFunctionExpression,\n call: N.CallExpression,\n ): N.ArrowFunctionExpression {\n if (this.match(tt.colon)) {\n const oldNoAnonFunctionType = this.state.noAnonFunctionType;\n this.state.noAnonFunctionType = true;\n node.returnType = this.flowParseTypeAnnotation();\n this.state.noAnonFunctionType = oldNoAnonFunctionType;\n }\n\n return super.parseAsyncArrowFromCallExpression(node, call);\n }\n\n // todo description\n shouldParseAsyncArrow(): boolean {\n return this.match(tt.colon) || super.shouldParseAsyncArrow();\n }\n\n // We need to support type parameter declarations for arrow functions. This\n // is tricky. There are three situations we need to handle\n //\n // 1. This is either JSX or an arrow function. We'll try JSX first. If that\n // fails, we'll try an arrow function. If that fails, we'll throw the JSX\n // error.\n // 2. This is an arrow function. We'll parse the type parameter declaration,\n // parse the rest, make sure the rest is an arrow function, and go from\n // there\n // 3. This is neither. Just call the super method\n parseMaybeAssign(\n refExpressionErrors?: ExpressionErrors | null,\n afterLeftParse?: Function,\n ): N.Expression {\n let state = null;\n\n let jsx;\n\n if (\n this.hasPlugin(\"jsx\") &&\n (this.match(tt.jsxTagStart) || this.match(tt.lt))\n ) {\n state = this.state.clone();\n\n jsx = this.tryParse(\n () => super.parseMaybeAssign(refExpressionErrors, afterLeftParse),\n state,\n );\n\n /*:: invariant(!jsx.aborted) */\n /*:: invariant(jsx.node != null) */\n if (!jsx.error) return jsx.node;\n\n // Remove `tc.j_expr` and `tc.j_oTag` from context added\n // by parsing `jsxTagStart` to stop the JSX plugin from\n // messing with the tokens\n const { context } = this.state;\n const currentContext = context[context.length - 1];\n if (currentContext === tc.j_oTag || currentContext === tc.j_expr) {\n context.pop();\n }\n }\n\n if (jsx?.error || this.match(tt.lt)) {\n state = state || this.state.clone();\n\n let typeParameters: N.TypeParameterDeclaration;\n\n const arrow = this.tryParse((abort: () => never) => {\n typeParameters = this.flowParseTypeParameterDeclaration();\n\n const arrowExpression = this.forwardNoArrowParamsConversionAt(\n typeParameters,\n () => {\n const result = super.parseMaybeAssign(\n refExpressionErrors,\n afterLeftParse,\n );\n\n this.resetStartLocationFromNode(result, typeParameters);\n\n return result;\n },\n );\n\n // (() => {});\n // (() => {}: any);\n if (arrowExpression.extra?.parenthesized) abort();\n\n // The above can return a TypeCastExpression when the arrow\n // expression is not wrapped in parens. See also `this.parseParenItem`.\n // (() => {}: any);\n const expr = this.maybeUnwrapTypeCastExpression(arrowExpression);\n\n if (expr.type !== \"ArrowFunctionExpression\") abort();\n\n expr.typeParameters = typeParameters;\n this.resetStartLocationFromNode(expr, typeParameters);\n\n return arrowExpression;\n }, state);\n\n let arrowExpression:\n | N.ArrowFunctionExpression\n | N.TypeCastExpression\n | undefined\n | null = null;\n\n if (\n arrow.node &&\n this.maybeUnwrapTypeCastExpression(arrow.node).type ===\n \"ArrowFunctionExpression\"\n ) {\n if (!arrow.error && !arrow.aborted) {\n // async () => {}\n // @ts-expect-error: refine tryParse typings\n if (arrow.node.async) {\n /*:: invariant(typeParameters) */\n this.raise(\n FlowErrors.UnexpectedTypeParameterBeforeAsyncArrowFunction,\n typeParameters,\n );\n }\n return arrow.node;\n }\n\n // @ts-expect-error: refine typings\n arrowExpression = arrow.node;\n }\n\n // If we are here, both JSX and Flow parsing attempts failed.\n // Give the precedence to the JSX error, except if JSX had an\n // unrecoverable error while Flow didn't.\n // If the error is recoverable, we can only re-report it if there is\n // a node we can return.\n\n if (jsx?.node) {\n /*:: invariant(jsx.failState) */\n this.state = jsx.failState;\n return jsx.node;\n }\n\n if (arrowExpression) {\n /*:: invariant(arrow.failState) */\n this.state = arrow.failState;\n return arrowExpression;\n }\n\n if (jsx?.thrown) throw jsx.error;\n if (arrow.thrown) throw arrow.error;\n\n /*:: invariant(typeParameters) */\n throw this.raise(\n FlowErrors.UnexpectedTokenAfterTypeParameter,\n typeParameters,\n );\n }\n\n return super.parseMaybeAssign(refExpressionErrors, afterLeftParse);\n }\n\n // handle return types for arrow functions\n parseArrow(\n node: Undone,\n ): Undone | undefined | null {\n if (this.match(tt.colon)) {\n // @ts-expect-error todo(flow->ts)\n const result = this.tryParse(() => {\n const oldNoAnonFunctionType = this.state.noAnonFunctionType;\n this.state.noAnonFunctionType = true;\n\n const typeNode = this.startNode();\n\n [\n typeNode.typeAnnotation,\n // @ts-expect-error (destructuring not supported yet)\n node.predicate,\n ] = this.flowParseTypeAndPredicateInitialiser();\n\n this.state.noAnonFunctionType = oldNoAnonFunctionType;\n\n if (this.canInsertSemicolon()) this.unexpected();\n if (!this.match(tt.arrow)) this.unexpected();\n\n return typeNode;\n });\n\n if (result.thrown) return null;\n /*:: invariant(result.node) */\n\n if (result.error) this.state = result.failState;\n\n // assign after it is clear it is an arrow\n // @ts-expect-error todo(flow->ts)\n node.returnType = result.node.typeAnnotation\n ? this.finishNode(result.node, \"TypeAnnotation\")\n : null;\n }\n\n return super.parseArrow(node);\n }\n\n shouldParseArrow(params: Array): boolean {\n return this.match(tt.colon) || super.shouldParseArrow(params);\n }\n\n setArrowFunctionParameters(\n node: Undone,\n params:\n | Array\n | Array,\n ): void {\n if (\n this.state.noArrowParamsConversionAt.includes(\n this.offsetToSourcePos(node.start),\n )\n ) {\n node.params = params as N.ArrowFunctionExpression[\"params\"];\n } else {\n super.setArrowFunctionParameters(node, params);\n }\n }\n\n checkParams(\n node: N.Function,\n allowDuplicates: boolean,\n isArrowFunction?: boolean | null,\n strictModeChanged: boolean = true,\n ): void {\n if (\n isArrowFunction &&\n this.state.noArrowParamsConversionAt.includes(\n this.offsetToSourcePos(node.start),\n )\n ) {\n return;\n }\n\n // ensure the `this` param is first, if it exists\n for (let i = 0; i < node.params.length; i++) {\n if (this.isThisParam(node.params[i]) && i > 0) {\n this.raise(FlowErrors.ThisParamMustBeFirst, node.params[i]);\n }\n }\n\n super.checkParams(\n node,\n allowDuplicates,\n isArrowFunction,\n strictModeChanged,\n );\n }\n\n parseParenAndDistinguishExpression(canBeArrow: boolean): N.Expression {\n return super.parseParenAndDistinguishExpression(\n canBeArrow &&\n !this.state.noArrowAt.includes(\n this.sourceToOffsetPos(this.state.start),\n ),\n );\n }\n\n parseSubscripts(\n base: N.Expression,\n startLoc: Position,\n noCalls?: boolean | null,\n ): N.Expression {\n if (\n base.type === \"Identifier\" &&\n base.name === \"async\" &&\n this.state.noArrowAt.includes(startLoc.index)\n ) {\n this.next();\n\n const node = this.startNodeAt(startLoc);\n node.callee = base;\n node.arguments = super.parseCallExpressionArguments();\n base = this.finishNode(node, \"CallExpression\");\n } else if (\n base.type === \"Identifier\" &&\n base.name === \"async\" &&\n this.match(tt.lt)\n ) {\n const state = this.state.clone();\n const arrow = this.tryParse(\n abort => this.parseAsyncArrowWithTypeParameters(startLoc) || abort(),\n state,\n );\n\n /*:: invariant(arrow.node != null) */\n // @ts-expect-error: refine tryParse typings\n if (!arrow.error && !arrow.aborted) return arrow.node;\n\n const result = this.tryParse(\n () => super.parseSubscripts(base, startLoc, noCalls),\n state,\n );\n\n if (result.node && !result.error) return result.node;\n\n if (arrow.node) {\n this.state = arrow.failState;\n // @ts-expect-error: refine tryParse typings\n return arrow.node;\n }\n\n if (result.node) {\n this.state = result.failState;\n return result.node;\n }\n\n throw arrow.error || result.error;\n }\n\n return super.parseSubscripts(base, startLoc, noCalls);\n }\n\n parseSubscript(\n base: N.Expression,\n\n startLoc: Position,\n noCalls: boolean | undefined | null,\n subscriptState: N.ParseSubscriptState,\n ): N.Expression {\n if (this.match(tt.questionDot) && this.isLookaheadToken_lt()) {\n subscriptState.optionalChainMember = true;\n if (noCalls) {\n subscriptState.stop = true;\n return base;\n }\n this.next();\n const node = this.startNodeAt(startLoc);\n node.callee = base;\n node.typeArguments =\n this.flowParseTypeParameterInstantiationInExpression();\n this.expect(tt.parenL);\n node.arguments = this.parseCallExpressionArguments();\n node.optional = true;\n return this.finishCallExpression(node, /* optional */ true);\n } else if (\n !noCalls &&\n this.shouldParseTypes() &&\n (this.match(tt.lt) ||\n // also handles `new C<`\n this.match(tt.bitShiftL))\n ) {\n const node = this.startNodeAt<\n N.OptionalCallExpression | N.CallExpression\n >(startLoc);\n node.callee = base;\n\n const result = this.tryParse(() => {\n node.typeArguments =\n this.flowParseTypeParameterInstantiationCallOrNew();\n this.expect(tt.parenL);\n node.arguments = super.parseCallExpressionArguments();\n if (subscriptState.optionalChainMember) {\n (node as Undone).optional = false;\n }\n return this.finishCallExpression(\n node,\n subscriptState.optionalChainMember,\n );\n });\n\n if (result.node) {\n if (result.error) this.state = result.failState;\n return result.node;\n }\n }\n\n return super.parseSubscript(\n base,\n\n startLoc,\n noCalls,\n subscriptState,\n );\n }\n\n parseNewCallee(node: N.NewExpression): void {\n super.parseNewCallee(node);\n\n let targs = null;\n if (this.shouldParseTypes() && this.match(tt.lt)) {\n targs = this.tryParse(() =>\n this.flowParseTypeParameterInstantiationCallOrNew(),\n ).node;\n }\n node.typeArguments = targs;\n }\n\n parseAsyncArrowWithTypeParameters(\n startLoc: Position,\n ): N.ArrowFunctionExpression | undefined | null {\n const node = this.startNodeAt(startLoc);\n this.parseFunctionParams(node, false);\n if (!this.parseArrow(node)) return;\n return super.parseArrowExpression(\n node,\n /* params */ undefined,\n /* isAsync */ true,\n );\n }\n\n readToken_mult_modulo(code: number): void {\n const next = this.input.charCodeAt(this.state.pos + 1);\n if (\n code === charCodes.asterisk &&\n next === charCodes.slash &&\n this.state.hasFlowComment\n ) {\n this.state.hasFlowComment = false;\n this.state.pos += 2;\n this.nextToken();\n return;\n }\n\n super.readToken_mult_modulo(code);\n }\n\n readToken_pipe_amp(code: number): void {\n const next = this.input.charCodeAt(this.state.pos + 1);\n if (\n code === charCodes.verticalBar &&\n next === charCodes.rightCurlyBrace\n ) {\n // '|}'\n this.finishOp(tt.braceBarR, 2);\n return;\n }\n\n super.readToken_pipe_amp(code);\n }\n\n parseTopLevel(file: N.File, program: N.Program): N.File {\n const fileNode = super.parseTopLevel(file, program);\n if (this.state.hasFlowComment) {\n this.raise(\n FlowErrors.UnterminatedFlowComment,\n this.state.curPosition(),\n );\n }\n return fileNode;\n }\n\n skipBlockComment(): N.CommentBlock | undefined {\n if (this.hasPlugin(\"flowComments\") && this.skipFlowComment()) {\n if (this.state.hasFlowComment) {\n throw this.raise(FlowErrors.NestedFlowComment, this.state.startLoc);\n }\n this.hasFlowCommentCompletion();\n const commentSkip = this.skipFlowComment();\n if (commentSkip) {\n this.state.pos += commentSkip;\n this.state.hasFlowComment = true;\n }\n return;\n }\n\n return super.skipBlockComment(this.state.hasFlowComment ? \"*-/\" : \"*/\");\n }\n\n skipFlowComment(): number | false {\n const { pos } = this.state;\n let shiftToFirstNonWhiteSpace = 2;\n while (\n [charCodes.space, charCodes.tab].includes(\n // @ts-expect-error testing whether a number is included\n this.input.charCodeAt(pos + shiftToFirstNonWhiteSpace),\n )\n ) {\n shiftToFirstNonWhiteSpace++;\n }\n\n const ch2 = this.input.charCodeAt(shiftToFirstNonWhiteSpace + pos);\n const ch3 = this.input.charCodeAt(shiftToFirstNonWhiteSpace + pos + 1);\n\n if (ch2 === charCodes.colon && ch3 === charCodes.colon) {\n return shiftToFirstNonWhiteSpace + 2; // check for /*::\n }\n if (\n this.input.slice(\n shiftToFirstNonWhiteSpace + pos,\n shiftToFirstNonWhiteSpace + pos + 12,\n ) === \"flow-include\"\n ) {\n return shiftToFirstNonWhiteSpace + 12; // check for /*flow-include\n }\n if (ch2 === charCodes.colon && ch3 !== charCodes.colon) {\n return shiftToFirstNonWhiteSpace; // check for /*:, advance up to :\n }\n return false;\n }\n\n hasFlowCommentCompletion(): void {\n const end = this.input.indexOf(\"*/\", this.state.pos);\n if (end === -1) {\n throw this.raise(Errors.UnterminatedComment, this.state.curPosition());\n }\n }\n\n // Flow enum parsing\n\n flowEnumErrorBooleanMemberNotInitialized(\n loc: Position,\n {\n enumName,\n memberName,\n }: {\n enumName: string;\n memberName: string;\n },\n ): void {\n this.raise(FlowErrors.EnumBooleanMemberNotInitialized, loc, {\n memberName,\n enumName,\n });\n }\n\n flowEnumErrorInvalidMemberInitializer(\n loc: Position,\n enumContext: EnumContext,\n ) {\n return this.raise(\n !enumContext.explicitType\n ? FlowErrors.EnumInvalidMemberInitializerUnknownType\n : enumContext.explicitType === \"symbol\"\n ? FlowErrors.EnumInvalidMemberInitializerSymbolType\n : FlowErrors.EnumInvalidMemberInitializerPrimaryType,\n loc,\n enumContext,\n );\n }\n\n flowEnumErrorNumberMemberNotInitialized(\n loc: Position,\n details: {\n enumName: string;\n memberName: string;\n },\n ): void {\n this.raise(FlowErrors.EnumNumberMemberNotInitialized, loc, details);\n }\n\n flowEnumErrorStringMemberInconsistentlyInitialized(\n node: N.Node,\n details: {\n enumName: string;\n },\n ): void {\n this.raise(\n FlowErrors.EnumStringMemberInconsistentlyInitialized,\n node,\n details,\n );\n }\n\n flowEnumMemberInit(): EnumMemberInit {\n const startLoc = this.state.startLoc;\n const endOfInit = () => this.match(tt.comma) || this.match(tt.braceR);\n switch (this.state.type) {\n case tt.num: {\n const literal = this.parseNumericLiteral(this.state.value);\n if (endOfInit()) {\n return { type: \"number\", loc: literal.loc.start, value: literal };\n }\n return { type: \"invalid\", loc: startLoc };\n }\n case tt.string: {\n const literal = this.parseStringLiteral(this.state.value);\n if (endOfInit()) {\n return { type: \"string\", loc: literal.loc.start, value: literal };\n }\n return { type: \"invalid\", loc: startLoc };\n }\n case tt._true:\n case tt._false: {\n const literal = this.parseBooleanLiteral(this.match(tt._true));\n if (endOfInit()) {\n return {\n type: \"boolean\",\n loc: literal.loc.start,\n value: literal,\n };\n }\n return { type: \"invalid\", loc: startLoc };\n }\n default:\n return { type: \"invalid\", loc: startLoc };\n }\n }\n\n flowEnumMemberRaw(): {\n id: N.Identifier;\n init: EnumMemberInit;\n } {\n const loc = this.state.startLoc;\n const id = this.parseIdentifier(true);\n const init = this.eat(tt.eq)\n ? this.flowEnumMemberInit()\n : { type: \"none\" as const, loc };\n return { id, init };\n }\n\n flowEnumCheckExplicitTypeMismatch(\n loc: Position,\n context: EnumContext,\n expectedType: EnumExplicitType,\n ): void {\n const { explicitType } = context;\n if (explicitType === null) {\n return;\n }\n if (explicitType !== expectedType) {\n this.flowEnumErrorInvalidMemberInitializer(loc, context);\n }\n }\n\n flowEnumMembers({\n enumName,\n explicitType,\n }: {\n enumName: string;\n explicitType: EnumExplicitType;\n }): {\n members: {\n booleanMembers: Extract<\n N.FlowEnumMember,\n { type: \"EnumBooleanMember\" }\n >[];\n numberMembers: Extract<\n N.FlowEnumMember,\n { type: \"EnumNumberMember\" }\n >[];\n stringMembers: Extract<\n N.FlowEnumMember,\n { type: \"EnumStringMember\" }\n >[];\n defaultedMembers: Extract<\n N.FlowEnumMember,\n { type: \"EnumDefaultedMember\" }\n >[];\n };\n hasUnknownMembers: boolean;\n } {\n const seenNames = new Set();\n const members = {\n // @ts-expect-error: migrate to Babel types\n booleanMembers: [],\n // @ts-expect-error: migrate to Babel types\n numberMembers: [],\n // @ts-expect-error: migrate to Babel types\n stringMembers: [],\n // @ts-expect-error: migrate to Babel types\n defaultedMembers: [],\n };\n let hasUnknownMembers = false;\n while (!this.match(tt.braceR)) {\n if (this.eat(tt.ellipsis)) {\n hasUnknownMembers = true;\n break;\n }\n const memberNode = this.startNode();\n const { id, init } = this.flowEnumMemberRaw();\n const memberName = id.name;\n if (memberName === \"\") {\n continue;\n }\n if (/^[a-z]/.test(memberName)) {\n this.raise(FlowErrors.EnumInvalidMemberName, id, {\n memberName,\n suggestion: memberName[0].toUpperCase() + memberName.slice(1),\n enumName,\n });\n }\n if (seenNames.has(memberName)) {\n this.raise(FlowErrors.EnumDuplicateMemberName, id, {\n memberName,\n enumName,\n });\n }\n seenNames.add(memberName);\n const context = { enumName, explicitType, memberName };\n memberNode.id = id;\n switch (init.type) {\n case \"boolean\": {\n this.flowEnumCheckExplicitTypeMismatch(\n init.loc,\n context,\n \"boolean\",\n );\n memberNode.init = init.value;\n members.booleanMembers.push(\n this.finishNode(memberNode, \"EnumBooleanMember\"),\n );\n break;\n }\n case \"number\": {\n this.flowEnumCheckExplicitTypeMismatch(init.loc, context, \"number\");\n memberNode.init = init.value;\n members.numberMembers.push(\n this.finishNode(memberNode, \"EnumNumberMember\"),\n );\n break;\n }\n case \"string\": {\n this.flowEnumCheckExplicitTypeMismatch(init.loc, context, \"string\");\n memberNode.init = init.value;\n members.stringMembers.push(\n this.finishNode(memberNode, \"EnumStringMember\"),\n );\n break;\n }\n case \"invalid\": {\n throw this.flowEnumErrorInvalidMemberInitializer(init.loc, context);\n }\n case \"none\": {\n switch (explicitType) {\n case \"boolean\":\n this.flowEnumErrorBooleanMemberNotInitialized(\n init.loc,\n context,\n );\n break;\n case \"number\":\n this.flowEnumErrorNumberMemberNotInitialized(init.loc, context);\n break;\n default:\n members.defaultedMembers.push(\n this.finishNode(memberNode, \"EnumDefaultedMember\"),\n );\n }\n }\n }\n\n if (!this.match(tt.braceR)) {\n this.expect(tt.comma);\n }\n }\n return { members, hasUnknownMembers };\n }\n\n flowEnumStringMembers(\n initializedMembers: Array,\n defaultedMembers: Array,\n {\n enumName,\n }: {\n enumName: string;\n },\n ): Array {\n if (initializedMembers.length === 0) {\n return defaultedMembers;\n } else if (defaultedMembers.length === 0) {\n return initializedMembers;\n } else if (defaultedMembers.length > initializedMembers.length) {\n for (const member of initializedMembers) {\n this.flowEnumErrorStringMemberInconsistentlyInitialized(member, {\n enumName,\n });\n }\n return defaultedMembers;\n } else {\n for (const member of defaultedMembers) {\n this.flowEnumErrorStringMemberInconsistentlyInitialized(member, {\n enumName,\n });\n }\n return initializedMembers;\n }\n }\n\n flowEnumParseExplicitType({\n enumName,\n }: {\n enumName: string;\n }): EnumExplicitType {\n if (!this.eatContextual(tt._of)) return null;\n\n if (!tokenIsIdentifier(this.state.type)) {\n throw this.raise(\n FlowErrors.EnumInvalidExplicitTypeUnknownSupplied,\n this.state.startLoc,\n {\n enumName,\n },\n );\n }\n\n const { value } = this.state;\n this.next();\n\n if (\n value !== \"boolean\" &&\n value !== \"number\" &&\n value !== \"string\" &&\n value !== \"symbol\"\n ) {\n this.raise(FlowErrors.EnumInvalidExplicitType, this.state.startLoc, {\n enumName,\n invalidEnumType: value,\n });\n }\n\n return value;\n }\n\n flowEnumBody(node: Undone, id: N.Identifier): N.Node {\n const enumName = id.name;\n const nameLoc = id.loc.start;\n const explicitType = this.flowEnumParseExplicitType({ enumName });\n this.expect(tt.braceL);\n const { members, hasUnknownMembers } = this.flowEnumMembers({\n enumName,\n explicitType,\n });\n node.hasUnknownMembers = hasUnknownMembers;\n\n switch (explicitType) {\n case \"boolean\":\n node.explicitType = true;\n node.members = members.booleanMembers;\n this.expect(tt.braceR);\n return this.finishNode(node, \"EnumBooleanBody\");\n case \"number\":\n node.explicitType = true;\n node.members = members.numberMembers;\n this.expect(tt.braceR);\n return this.finishNode(node, \"EnumNumberBody\");\n case \"string\":\n node.explicitType = true;\n node.members = this.flowEnumStringMembers(\n members.stringMembers,\n members.defaultedMembers,\n { enumName },\n );\n this.expect(tt.braceR);\n return this.finishNode(node, \"EnumStringBody\");\n case \"symbol\":\n node.members = members.defaultedMembers;\n this.expect(tt.braceR);\n return this.finishNode(node, \"EnumSymbolBody\");\n default: {\n // `explicitType` is `null`\n const empty = () => {\n node.members = [];\n this.expect(tt.braceR);\n return this.finishNode(node, \"EnumStringBody\");\n };\n node.explicitType = false;\n\n const boolsLen = members.booleanMembers.length;\n const numsLen = members.numberMembers.length;\n const strsLen = members.stringMembers.length;\n const defaultedLen = members.defaultedMembers.length;\n\n if (!boolsLen && !numsLen && !strsLen && !defaultedLen) {\n return empty();\n } else if (!boolsLen && !numsLen) {\n node.members = this.flowEnumStringMembers(\n members.stringMembers,\n members.defaultedMembers,\n { enumName },\n );\n this.expect(tt.braceR);\n return this.finishNode(node, \"EnumStringBody\");\n } else if (!numsLen && !strsLen && boolsLen >= defaultedLen) {\n for (const member of members.defaultedMembers) {\n this.flowEnumErrorBooleanMemberNotInitialized(member.loc.start, {\n enumName,\n memberName: member.id.name,\n });\n }\n node.members = members.booleanMembers;\n this.expect(tt.braceR);\n return this.finishNode(node, \"EnumBooleanBody\");\n } else if (!boolsLen && !strsLen && numsLen >= defaultedLen) {\n for (const member of members.defaultedMembers) {\n this.flowEnumErrorNumberMemberNotInitialized(member.loc.start, {\n enumName,\n memberName: member.id.name,\n });\n }\n node.members = members.numberMembers;\n this.expect(tt.braceR);\n return this.finishNode(node, \"EnumNumberBody\");\n } else {\n this.raise(FlowErrors.EnumInconsistentMemberValues, nameLoc, {\n enumName,\n });\n return empty();\n }\n }\n }\n }\n\n flowParseEnumDeclaration(\n node: Undone,\n ): N.FlowEnumDeclaration {\n const id = this.parseIdentifier();\n node.id = id;\n node.body = this.flowEnumBody(this.startNode(), id);\n return this.finishNode(node, \"EnumDeclaration\");\n }\n\n jsxParseOpeningElementAfterName(\n node: N.JSXOpeningElement,\n ): N.JSXOpeningElement {\n if (this.shouldParseTypes()) {\n if (this.match(tt.lt) || this.match(tt.bitShiftL)) {\n node.typeArguments =\n this.flowParseTypeParameterInstantiationInExpression();\n }\n }\n\n return super.jsxParseOpeningElementAfterName(node);\n }\n\n // check if the next token is a tt.lt\n isLookaheadToken_lt(): boolean {\n const next = this.nextTokenStart();\n if (this.input.charCodeAt(next) === charCodes.lessThan) {\n const afterNext = this.input.charCodeAt(next + 1);\n return (\n afterNext !== charCodes.lessThan && afterNext !== charCodes.equalsTo\n );\n }\n return false;\n }\n\n // used after we have finished parsing types\n reScan_lt_gt() {\n const { type } = this.state;\n if (type === tt.lt) {\n this.state.pos -= 1;\n this.readToken_lt();\n } else if (type === tt.gt) {\n this.state.pos -= 1;\n this.readToken_gt();\n }\n }\n\n reScan_lt() {\n const { type } = this.state;\n if (type === tt.bitShiftL) {\n this.state.pos -= 2;\n this.finishOp(tt.lt, 1);\n return tt.lt;\n }\n return type;\n }\n\n maybeUnwrapTypeCastExpression(node: N.Node) {\n return node.type === \"TypeCastExpression\" ? node.expression : node;\n }\n };\n","const entities: { [name: string]: string } = {\n __proto__: null,\n quot: \"\\u0022\",\n amp: \"&\",\n apos: \"\\u0027\",\n lt: \"<\",\n gt: \">\",\n nbsp: \"\\u00A0\",\n iexcl: \"\\u00A1\",\n cent: \"\\u00A2\",\n pound: \"\\u00A3\",\n curren: \"\\u00A4\",\n yen: \"\\u00A5\",\n brvbar: \"\\u00A6\",\n sect: \"\\u00A7\",\n uml: \"\\u00A8\",\n copy: \"\\u00A9\",\n ordf: \"\\u00AA\",\n laquo: \"\\u00AB\",\n not: \"\\u00AC\",\n shy: \"\\u00AD\",\n reg: \"\\u00AE\",\n macr: \"\\u00AF\",\n deg: \"\\u00B0\",\n plusmn: \"\\u00B1\",\n sup2: \"\\u00B2\",\n sup3: \"\\u00B3\",\n acute: \"\\u00B4\",\n micro: \"\\u00B5\",\n para: \"\\u00B6\",\n middot: \"\\u00B7\",\n cedil: \"\\u00B8\",\n sup1: \"\\u00B9\",\n ordm: \"\\u00BA\",\n raquo: \"\\u00BB\",\n frac14: \"\\u00BC\",\n frac12: \"\\u00BD\",\n frac34: \"\\u00BE\",\n iquest: \"\\u00BF\",\n Agrave: \"\\u00C0\",\n Aacute: \"\\u00C1\",\n Acirc: \"\\u00C2\",\n Atilde: \"\\u00C3\",\n Auml: \"\\u00C4\",\n Aring: \"\\u00C5\",\n AElig: \"\\u00C6\",\n Ccedil: \"\\u00C7\",\n Egrave: \"\\u00C8\",\n Eacute: \"\\u00C9\",\n Ecirc: \"\\u00CA\",\n Euml: \"\\u00CB\",\n Igrave: \"\\u00CC\",\n Iacute: \"\\u00CD\",\n Icirc: \"\\u00CE\",\n Iuml: \"\\u00CF\",\n ETH: \"\\u00D0\",\n Ntilde: \"\\u00D1\",\n Ograve: \"\\u00D2\",\n Oacute: \"\\u00D3\",\n Ocirc: \"\\u00D4\",\n Otilde: \"\\u00D5\",\n Ouml: \"\\u00D6\",\n times: \"\\u00D7\",\n Oslash: \"\\u00D8\",\n Ugrave: \"\\u00D9\",\n Uacute: \"\\u00DA\",\n Ucirc: \"\\u00DB\",\n Uuml: \"\\u00DC\",\n Yacute: \"\\u00DD\",\n THORN: \"\\u00DE\",\n szlig: \"\\u00DF\",\n agrave: \"\\u00E0\",\n aacute: \"\\u00E1\",\n acirc: \"\\u00E2\",\n atilde: \"\\u00E3\",\n auml: \"\\u00E4\",\n aring: \"\\u00E5\",\n aelig: \"\\u00E6\",\n ccedil: \"\\u00E7\",\n egrave: \"\\u00E8\",\n eacute: \"\\u00E9\",\n ecirc: \"\\u00EA\",\n euml: \"\\u00EB\",\n igrave: \"\\u00EC\",\n iacute: \"\\u00ED\",\n icirc: \"\\u00EE\",\n iuml: \"\\u00EF\",\n eth: \"\\u00F0\",\n ntilde: \"\\u00F1\",\n ograve: \"\\u00F2\",\n oacute: \"\\u00F3\",\n ocirc: \"\\u00F4\",\n otilde: \"\\u00F5\",\n ouml: \"\\u00F6\",\n divide: \"\\u00F7\",\n oslash: \"\\u00F8\",\n ugrave: \"\\u00F9\",\n uacute: \"\\u00FA\",\n ucirc: \"\\u00FB\",\n uuml: \"\\u00FC\",\n yacute: \"\\u00FD\",\n thorn: \"\\u00FE\",\n yuml: \"\\u00FF\",\n OElig: \"\\u0152\",\n oelig: \"\\u0153\",\n Scaron: \"\\u0160\",\n scaron: \"\\u0161\",\n Yuml: \"\\u0178\",\n fnof: \"\\u0192\",\n circ: \"\\u02C6\",\n tilde: \"\\u02DC\",\n Alpha: \"\\u0391\",\n Beta: \"\\u0392\",\n Gamma: \"\\u0393\",\n Delta: \"\\u0394\",\n Epsilon: \"\\u0395\",\n Zeta: \"\\u0396\",\n Eta: \"\\u0397\",\n Theta: \"\\u0398\",\n Iota: \"\\u0399\",\n Kappa: \"\\u039A\",\n Lambda: \"\\u039B\",\n Mu: \"\\u039C\",\n Nu: \"\\u039D\",\n Xi: \"\\u039E\",\n Omicron: \"\\u039F\",\n Pi: \"\\u03A0\",\n Rho: \"\\u03A1\",\n Sigma: \"\\u03A3\",\n Tau: \"\\u03A4\",\n Upsilon: \"\\u03A5\",\n Phi: \"\\u03A6\",\n Chi: \"\\u03A7\",\n Psi: \"\\u03A8\",\n Omega: \"\\u03A9\",\n alpha: \"\\u03B1\",\n beta: \"\\u03B2\",\n gamma: \"\\u03B3\",\n delta: \"\\u03B4\",\n epsilon: \"\\u03B5\",\n zeta: \"\\u03B6\",\n eta: \"\\u03B7\",\n theta: \"\\u03B8\",\n iota: \"\\u03B9\",\n kappa: \"\\u03BA\",\n lambda: \"\\u03BB\",\n mu: \"\\u03BC\",\n nu: \"\\u03BD\",\n xi: \"\\u03BE\",\n omicron: \"\\u03BF\",\n pi: \"\\u03C0\",\n rho: \"\\u03C1\",\n sigmaf: \"\\u03C2\",\n sigma: \"\\u03C3\",\n tau: \"\\u03C4\",\n upsilon: \"\\u03C5\",\n phi: \"\\u03C6\",\n chi: \"\\u03C7\",\n psi: \"\\u03C8\",\n omega: \"\\u03C9\",\n thetasym: \"\\u03D1\",\n upsih: \"\\u03D2\",\n piv: \"\\u03D6\",\n ensp: \"\\u2002\",\n emsp: \"\\u2003\",\n thinsp: \"\\u2009\",\n zwnj: \"\\u200C\",\n zwj: \"\\u200D\",\n lrm: \"\\u200E\",\n rlm: \"\\u200F\",\n ndash: \"\\u2013\",\n mdash: \"\\u2014\",\n lsquo: \"\\u2018\",\n rsquo: \"\\u2019\",\n sbquo: \"\\u201A\",\n ldquo: \"\\u201C\",\n rdquo: \"\\u201D\",\n bdquo: \"\\u201E\",\n dagger: \"\\u2020\",\n Dagger: \"\\u2021\",\n bull: \"\\u2022\",\n hellip: \"\\u2026\",\n permil: \"\\u2030\",\n prime: \"\\u2032\",\n Prime: \"\\u2033\",\n lsaquo: \"\\u2039\",\n rsaquo: \"\\u203A\",\n oline: \"\\u203E\",\n frasl: \"\\u2044\",\n euro: \"\\u20AC\",\n image: \"\\u2111\",\n weierp: \"\\u2118\",\n real: \"\\u211C\",\n trade: \"\\u2122\",\n alefsym: \"\\u2135\",\n larr: \"\\u2190\",\n uarr: \"\\u2191\",\n rarr: \"\\u2192\",\n darr: \"\\u2193\",\n harr: \"\\u2194\",\n crarr: \"\\u21B5\",\n lArr: \"\\u21D0\",\n uArr: \"\\u21D1\",\n rArr: \"\\u21D2\",\n dArr: \"\\u21D3\",\n hArr: \"\\u21D4\",\n forall: \"\\u2200\",\n part: \"\\u2202\",\n exist: \"\\u2203\",\n empty: \"\\u2205\",\n nabla: \"\\u2207\",\n isin: \"\\u2208\",\n notin: \"\\u2209\",\n ni: \"\\u220B\",\n prod: \"\\u220F\",\n sum: \"\\u2211\",\n minus: \"\\u2212\",\n lowast: \"\\u2217\",\n radic: \"\\u221A\",\n prop: \"\\u221D\",\n infin: \"\\u221E\",\n ang: \"\\u2220\",\n and: \"\\u2227\",\n or: \"\\u2228\",\n cap: \"\\u2229\",\n cup: \"\\u222A\",\n int: \"\\u222B\",\n there4: \"\\u2234\",\n sim: \"\\u223C\",\n cong: \"\\u2245\",\n asymp: \"\\u2248\",\n ne: \"\\u2260\",\n equiv: \"\\u2261\",\n le: \"\\u2264\",\n ge: \"\\u2265\",\n sub: \"\\u2282\",\n sup: \"\\u2283\",\n nsub: \"\\u2284\",\n sube: \"\\u2286\",\n supe: \"\\u2287\",\n oplus: \"\\u2295\",\n otimes: \"\\u2297\",\n perp: \"\\u22A5\",\n sdot: \"\\u22C5\",\n lceil: \"\\u2308\",\n rceil: \"\\u2309\",\n lfloor: \"\\u230A\",\n rfloor: \"\\u230B\",\n lang: \"\\u2329\",\n rang: \"\\u232A\",\n loz: \"\\u25CA\",\n spades: \"\\u2660\",\n clubs: \"\\u2663\",\n hearts: \"\\u2665\",\n diams: \"\\u2666\",\n} as const;\nexport default entities;\n","import * as charCodes from \"charcodes\";\n\n// Matches a whole line break (where CRLF is considered a single\n// line break). Used to count lines.\nexport const lineBreak = /\\r\\n|[\\r\\n\\u2028\\u2029]/;\nexport const lineBreakG = new RegExp(lineBreak.source, \"g\");\n\n// https://tc39.github.io/ecma262/#sec-line-terminators\nexport function isNewLine(code: number): boolean {\n switch (code) {\n case charCodes.lineFeed:\n case charCodes.carriageReturn:\n case charCodes.lineSeparator:\n case charCodes.paragraphSeparator:\n return true;\n\n default:\n return false;\n }\n}\n\nexport function hasNewLine(input: string, start: number, end: number): boolean {\n for (let i = start; i < end; i++) {\n if (isNewLine(input.charCodeAt(i))) {\n return true;\n }\n }\n return false;\n}\n\nexport const skipWhiteSpace = /(?:\\s|\\/\\/.*|\\/\\*[^]*?\\*\\/)*/g;\n\nexport const skipWhiteSpaceInLine =\n /(?:[^\\S\\n\\r\\u2028\\u2029]|\\/\\/.*|\\/\\*.*?\\*\\/)*/g;\n\n// https://tc39.github.io/ecma262/#sec-white-space\nexport function isWhitespace(code: number): boolean {\n switch (code) {\n case 0x0009: // CHARACTER TABULATION\n case 0x000b: // LINE TABULATION\n case 0x000c: // FORM FEED\n case charCodes.space:\n case charCodes.nonBreakingSpace:\n case charCodes.oghamSpaceMark:\n case 0x2000: // EN QUAD\n case 0x2001: // EM QUAD\n case 0x2002: // EN SPACE\n case 0x2003: // EM SPACE\n case 0x2004: // THREE-PER-EM SPACE\n case 0x2005: // FOUR-PER-EM SPACE\n case 0x2006: // SIX-PER-EM SPACE\n case 0x2007: // FIGURE SPACE\n case 0x2008: // PUNCTUATION SPACE\n case 0x2009: // THIN SPACE\n case 0x200a: // HAIR SPACE\n case 0x202f: // NARROW NO-BREAK SPACE\n case 0x205f: // MEDIUM MATHEMATICAL SPACE\n case 0x3000: // IDEOGRAPHIC SPACE\n case 0xfeff: // ZERO WIDTH NO-BREAK SPACE\n return true;\n\n default:\n return false;\n }\n}\n","import * as charCodes from \"charcodes\";\n\nimport XHTMLEntities from \"./xhtml.ts\";\nimport type Parser from \"../../parser/index.ts\";\nimport type { ExpressionErrors } from \"../../parser/util.ts\";\nimport {\n tokenComesBeforeExpression,\n tokenIsKeyword,\n tokenLabelName,\n type TokenType,\n tt,\n} from \"../../tokenizer/types.ts\";\nimport type { TokContext } from \"../../tokenizer/context.ts\";\nimport { types as tc } from \"../../tokenizer/context.ts\";\nimport type * as N from \"../../types.ts\";\nimport { isIdentifierChar, isIdentifierStart } from \"../../util/identifier.ts\";\nimport type { Position } from \"../../util/location.ts\";\nimport { isNewLine } from \"../../util/whitespace.ts\";\nimport { Errors, ParseErrorEnum } from \"../../parse-error.ts\";\nimport type { Undone } from \"../../parser/node.ts\";\n\n/* eslint sort-keys: \"error\" */\nconst JsxErrors = ParseErrorEnum`jsx`({\n AttributeIsEmpty:\n \"JSX attributes must only be assigned a non-empty expression.\",\n MissingClosingTagElement: ({ openingTagName }: { openingTagName: string }) =>\n `Expected corresponding JSX closing tag for <${openingTagName}>.`,\n MissingClosingTagFragment: \"Expected corresponding JSX closing tag for <>.\",\n UnexpectedSequenceExpression:\n \"Sequence expressions cannot be directly nested inside JSX. Did you mean to wrap it in parentheses (...)?\",\n // FIXME: Unify with Errors.UnexpectedToken\n UnexpectedToken: ({\n unexpected,\n HTMLEntity,\n }: {\n unexpected: string;\n HTMLEntity: string;\n }) =>\n `Unexpected token \\`${unexpected}\\`. Did you mean \\`${HTMLEntity}\\` or \\`{'${unexpected}'}\\`?`,\n UnsupportedJsxValue:\n \"JSX value should be either an expression or a quoted JSX text.\",\n UnterminatedJsxContent: \"Unterminated JSX contents.\",\n UnwrappedAdjacentJSXElements:\n \"Adjacent JSX elements must be wrapped in an enclosing tag. Did you want a JSX fragment <>...?\",\n});\n\n/* eslint-disable sort-keys */\n\nfunction isFragment(object?: N.JSXTag | null): object is N.JSXFragmentTag {\n return object\n ? object.type === \"JSXOpeningFragment\" ||\n object.type === \"JSXClosingFragment\"\n : false;\n}\n\n// Transforms JSX element name to string.\n\nfunction getQualifiedJSXName(\n object: N.JSXIdentifier | N.JSXNamespacedName | N.JSXMemberExpression,\n): string {\n if (object.type === \"JSXIdentifier\") {\n return object.name;\n }\n\n if (object.type === \"JSXNamespacedName\") {\n return object.namespace.name + \":\" + object.name.name;\n }\n\n if (object.type === \"JSXMemberExpression\") {\n return (\n getQualifiedJSXName(object.object) +\n \".\" +\n getQualifiedJSXName(object.property)\n );\n }\n\n // istanbul ignore next\n // @ts-expect-error - object is 'never'\n throw new Error(\"Node had unexpected type: \" + object.type);\n}\n\nexport interface IJSXParserMixin {\n jsxParseOpeningElementAfterName(\n node: N.JSXOpeningElement,\n ): N.JSXOpeningElement;\n}\n\nexport type ClassWithMixin<\n T extends new (...args: any) => any,\n M extends object,\n> = T extends new (...args: infer P) => infer I\n ? new (...args: P) => I & M\n : never;\n\nexport default (superClass: typeof Parser) =>\n class JSXParserMixin extends superClass implements Parser, IJSXParserMixin {\n // Reads inline JSX contents token.\n\n jsxReadToken(): void {\n let out = \"\";\n let chunkStart = this.state.pos;\n for (;;) {\n if (this.state.pos >= this.length) {\n throw this.raise(\n JsxErrors.UnterminatedJsxContent,\n this.state.startLoc,\n );\n }\n\n const ch = this.input.charCodeAt(this.state.pos);\n\n switch (ch) {\n case charCodes.lessThan:\n case charCodes.leftCurlyBrace:\n if (this.state.pos === this.state.start) {\n if (ch === charCodes.lessThan && this.state.canStartJSXElement) {\n ++this.state.pos;\n this.finishToken(tt.jsxTagStart);\n } else {\n super.getTokenFromCode(ch);\n }\n return;\n }\n out += this.input.slice(chunkStart, this.state.pos);\n this.finishToken(tt.jsxText, out);\n return;\n\n case charCodes.ampersand:\n out += this.input.slice(chunkStart, this.state.pos);\n out += this.jsxReadEntity();\n chunkStart = this.state.pos;\n break;\n\n case charCodes.greaterThan:\n case charCodes.rightCurlyBrace:\n if (process.env.BABEL_8_BREAKING) {\n this.raise(JsxErrors.UnexpectedToken, this.state.curPosition(), {\n unexpected: this.input[this.state.pos],\n HTMLEntity:\n ch === charCodes.rightCurlyBrace ? \"}\" : \">\",\n });\n }\n /* falls through */\n\n default:\n if (isNewLine(ch)) {\n out += this.input.slice(chunkStart, this.state.pos);\n out += this.jsxReadNewLine(true);\n chunkStart = this.state.pos;\n } else {\n ++this.state.pos;\n }\n }\n }\n }\n\n jsxReadNewLine(normalizeCRLF: boolean): string {\n const ch = this.input.charCodeAt(this.state.pos);\n let out;\n ++this.state.pos;\n if (\n ch === charCodes.carriageReturn &&\n this.input.charCodeAt(this.state.pos) === charCodes.lineFeed\n ) {\n ++this.state.pos;\n out = normalizeCRLF ? \"\\n\" : \"\\r\\n\";\n } else {\n out = String.fromCharCode(ch);\n }\n ++this.state.curLine;\n this.state.lineStart = this.state.pos;\n\n return out;\n }\n\n jsxReadString(quote: number): void {\n let out = \"\";\n let chunkStart = ++this.state.pos;\n for (;;) {\n if (this.state.pos >= this.length) {\n throw this.raise(Errors.UnterminatedString, this.state.startLoc);\n }\n\n const ch = this.input.charCodeAt(this.state.pos);\n if (ch === quote) break;\n if (ch === charCodes.ampersand) {\n out += this.input.slice(chunkStart, this.state.pos);\n out += this.jsxReadEntity();\n chunkStart = this.state.pos;\n } else if (isNewLine(ch)) {\n out += this.input.slice(chunkStart, this.state.pos);\n out += this.jsxReadNewLine(false);\n chunkStart = this.state.pos;\n } else {\n ++this.state.pos;\n }\n }\n out += this.input.slice(chunkStart, this.state.pos++);\n this.finishToken(tt.string, out);\n }\n\n jsxReadEntity(): string {\n const startPos = ++this.state.pos;\n if (this.codePointAtPos(this.state.pos) === charCodes.numberSign) {\n ++this.state.pos;\n\n let radix = 10;\n if (this.codePointAtPos(this.state.pos) === charCodes.lowercaseX) {\n radix = 16;\n ++this.state.pos;\n }\n\n const codePoint = this.readInt(\n radix,\n /* len */ undefined,\n /* forceLen */ false,\n /* allowNumSeparator */ \"bail\",\n );\n if (\n codePoint !== null &&\n this.codePointAtPos(this.state.pos) === charCodes.semicolon\n ) {\n ++this.state.pos;\n return String.fromCodePoint(codePoint);\n }\n } else {\n let count = 0;\n let semi = false;\n while (\n count++ < 10 &&\n this.state.pos < this.length &&\n !(semi = this.codePointAtPos(this.state.pos) === charCodes.semicolon)\n ) {\n ++this.state.pos;\n }\n\n if (semi) {\n const desc = this.input.slice(startPos, this.state.pos);\n const entity = XHTMLEntities[desc];\n ++this.state.pos;\n\n if (entity) {\n return entity;\n }\n }\n }\n\n // Not a valid entity\n this.state.pos = startPos;\n return \"&\";\n }\n\n // Read a JSX identifier (valid tag or attribute name).\n //\n // Optimized version since JSX identifiers can\"t contain\n // escape characters and so can be read as single slice.\n // Also assumes that first character was already checked\n // by isIdentifierStart in readToken.\n\n jsxReadWord(): void {\n let ch;\n const start = this.state.pos;\n do {\n ch = this.input.charCodeAt(++this.state.pos);\n } while (isIdentifierChar(ch) || ch === charCodes.dash);\n this.finishToken(tt.jsxName, this.input.slice(start, this.state.pos));\n }\n\n // Parse next token as JSX identifier\n\n jsxParseIdentifier(): N.JSXIdentifier {\n const node = this.startNode();\n if (this.match(tt.jsxName)) {\n node.name = this.state.value;\n } else if (tokenIsKeyword(this.state.type)) {\n node.name = tokenLabelName(this.state.type);\n } else {\n this.unexpected();\n }\n this.next();\n return this.finishNode(node, \"JSXIdentifier\");\n }\n\n // Parse namespaced identifier.\n\n jsxParseNamespacedName(): N.JSXNamespacedName | N.JSXIdentifier {\n const startLoc = this.state.startLoc;\n const name = this.jsxParseIdentifier();\n if (!this.eat(tt.colon)) return name;\n\n const node = this.startNodeAt(startLoc);\n node.namespace = name;\n node.name = this.jsxParseIdentifier();\n return this.finishNode(node, \"JSXNamespacedName\");\n }\n\n // Parses element name in any form - namespaced, member\n // or single identifier.\n\n jsxParseElementName():\n | N.JSXIdentifier\n | N.JSXNamespacedName\n | N.JSXMemberExpression {\n const startLoc = this.state.startLoc;\n let node: N.JSXIdentifier | N.JSXNamespacedName | N.JSXMemberExpression =\n this.jsxParseNamespacedName();\n if (node.type === \"JSXNamespacedName\") {\n return node;\n }\n while (this.eat(tt.dot)) {\n const newNode = this.startNodeAt(startLoc);\n newNode.object = node;\n newNode.property = this.jsxParseIdentifier();\n node = this.finishNode(newNode, \"JSXMemberExpression\");\n }\n return node;\n }\n\n // Parses any type of JSX attribute value.\n\n jsxParseAttributeValue():\n | N.JSXExpressionContainer\n | N.JSXElement\n | N.StringLiteral {\n let node;\n switch (this.state.type) {\n case tt.braceL:\n node = this.startNode();\n this.setContext(tc.brace);\n this.next();\n node = this.jsxParseExpressionContainer(node, tc.j_oTag);\n if (node.expression.type === \"JSXEmptyExpression\") {\n this.raise(JsxErrors.AttributeIsEmpty, node);\n }\n return node;\n\n case tt.jsxTagStart:\n case tt.string:\n return this.parseExprAtom() as N.JSXElement | N.StringLiteral;\n\n default:\n throw this.raise(JsxErrors.UnsupportedJsxValue, this.state.startLoc);\n }\n }\n\n // JSXEmptyExpression is unique type since it doesn't actually parse anything,\n // and so it should start at the end of last read token (left brace) and finish\n // at the beginning of the next one (right brace).\n\n jsxParseEmptyExpression(): N.JSXEmptyExpression {\n const node = this.startNodeAt(this.state.lastTokEndLoc);\n return this.finishNodeAt(node, \"JSXEmptyExpression\", this.state.startLoc);\n }\n\n // Parse JSX spread child\n\n jsxParseSpreadChild(node: Undone): N.JSXSpreadChild {\n this.next(); // ellipsis\n node.expression = this.parseExpression();\n this.setContext(tc.j_expr);\n this.state.canStartJSXElement = true;\n this.expect(tt.braceR);\n\n return this.finishNode(node, \"JSXSpreadChild\");\n }\n\n // Parses JSX expression enclosed into curly brackets.\n\n jsxParseExpressionContainer(\n node: Undone,\n previousContext: TokContext,\n ): N.JSXExpressionContainer {\n if (this.match(tt.braceR)) {\n node.expression = this.jsxParseEmptyExpression();\n } else {\n const expression = this.parseExpression();\n\n if (process.env.BABEL_8_BREAKING) {\n if (\n expression.type === \"SequenceExpression\" &&\n !expression.extra?.parenthesized\n ) {\n this.raise(\n JsxErrors.UnexpectedSequenceExpression,\n expression.expressions[1],\n );\n }\n }\n\n node.expression = expression;\n }\n this.setContext(previousContext);\n this.state.canStartJSXElement = true;\n this.expect(tt.braceR);\n\n return this.finishNode(node, \"JSXExpressionContainer\");\n }\n\n // Parses following JSX attribute name-value pair.\n\n jsxParseAttribute(): N.JSXAttribute | N.JSXSpreadAttribute {\n const node = this.startNode();\n if (this.match(tt.braceL)) {\n this.setContext(tc.brace);\n this.next();\n this.expect(tt.ellipsis);\n node.argument = this.parseMaybeAssignAllowIn();\n this.setContext(tc.j_oTag);\n this.state.canStartJSXElement = true;\n this.expect(tt.braceR);\n return this.finishNode(node, \"JSXSpreadAttribute\");\n }\n node.name = this.jsxParseNamespacedName();\n node.value = this.eat(tt.eq) ? this.jsxParseAttributeValue() : null;\n return this.finishNode(node, \"JSXAttribute\");\n }\n\n // Parses JSX opening tag starting after \"<\".\n\n jsxParseOpeningElementAt(\n startLoc: Position,\n ): N.JSXOpeningElement | N.JSXOpeningFragment {\n const node = this.startNodeAt(\n startLoc,\n );\n if (this.eat(tt.jsxTagEnd)) {\n return this.finishNode(node, \"JSXOpeningFragment\");\n }\n node.name = this.jsxParseElementName();\n return this.jsxParseOpeningElementAfterName(\n node as Undone,\n );\n }\n\n jsxParseOpeningElementAfterName(\n node: Undone,\n ): N.JSXOpeningElement {\n const attributes: (N.JSXAttribute | N.JSXSpreadAttribute)[] = [];\n while (!this.match(tt.slash) && !this.match(tt.jsxTagEnd)) {\n attributes.push(this.jsxParseAttribute());\n }\n node.attributes = attributes;\n node.selfClosing = this.eat(tt.slash);\n this.expect(tt.jsxTagEnd);\n return this.finishNode(node, \"JSXOpeningElement\");\n }\n\n // Parses JSX closing tag starting after \"(\n startLoc,\n );\n if (this.eat(tt.jsxTagEnd)) {\n return this.finishNode(node, \"JSXClosingFragment\");\n }\n node.name = this.jsxParseElementName();\n this.expect(tt.jsxTagEnd);\n return this.finishNode(node, \"JSXClosingElement\");\n }\n\n // Parses entire JSX element, including it\"s opening tag\n // (starting after \"<\"), attributes, contents and closing tag.\n\n jsxParseElementAt(startLoc: Position): N.JSXElement | N.JSXFragment {\n const node = this.startNodeAt(startLoc);\n const children = [];\n const openingElement = this.jsxParseOpeningElementAt(startLoc);\n let closingElement = null;\n\n if (!openingElement.selfClosing) {\n contents: for (;;) {\n switch (this.state.type) {\n case tt.jsxTagStart:\n startLoc = this.state.startLoc;\n this.next();\n if (this.eat(tt.slash)) {\n closingElement = this.jsxParseClosingElementAt(startLoc);\n break contents;\n }\n children.push(this.jsxParseElementAt(startLoc));\n break;\n\n case tt.jsxText:\n children.push(this.parseLiteral(this.state.value, \"JSXText\"));\n break;\n\n case tt.braceL: {\n const node = this.startNode<\n N.JSXSpreadChild | N.JSXExpressionContainer\n >();\n this.setContext(tc.brace);\n this.next();\n if (this.match(tt.ellipsis)) {\n children.push(this.jsxParseSpreadChild(node));\n } else {\n children.push(\n this.jsxParseExpressionContainer(node, tc.j_expr),\n );\n }\n\n break;\n }\n // istanbul ignore next - should never happen\n default:\n this.unexpected();\n }\n }\n\n if (\n isFragment(openingElement) &&\n !isFragment(closingElement) &&\n closingElement !== null\n ) {\n this.raise(JsxErrors.MissingClosingTagFragment, closingElement);\n } else if (!isFragment(openingElement) && isFragment(closingElement)) {\n this.raise(JsxErrors.MissingClosingTagElement, closingElement, {\n openingTagName: getQualifiedJSXName(openingElement.name),\n });\n } else if (!isFragment(openingElement) && !isFragment(closingElement)) {\n if (\n getQualifiedJSXName(closingElement.name) !==\n getQualifiedJSXName(openingElement.name)\n ) {\n this.raise(JsxErrors.MissingClosingTagElement, closingElement, {\n openingTagName: getQualifiedJSXName(openingElement.name),\n });\n }\n }\n }\n\n if (isFragment(openingElement)) {\n node.openingFragment = openingElement;\n node.closingFragment = closingElement;\n } else {\n node.openingElement = openingElement;\n node.closingElement = closingElement;\n }\n node.children = children;\n if (this.match(tt.lt)) {\n throw this.raise(\n JsxErrors.UnwrappedAdjacentJSXElements,\n this.state.startLoc,\n );\n }\n\n return isFragment(openingElement)\n ? this.finishNode(node, \"JSXFragment\")\n : this.finishNode(node, \"JSXElement\");\n }\n\n // Parses entire JSX element from current position.\n\n jsxParseElement(): N.JSXElement | N.JSXFragment {\n const startLoc = this.state.startLoc;\n this.next();\n return this.jsxParseElementAt(startLoc);\n }\n\n setContext(newContext: TokContext) {\n const { context } = this.state;\n context[context.length - 1] = newContext;\n }\n\n // ==================================\n // Overrides\n // ==================================\n\n parseExprAtom(refExpressionErrors?: ExpressionErrors | null): N.Expression {\n if (this.match(tt.jsxTagStart)) {\n return this.jsxParseElement();\n } else if (\n this.match(tt.lt) &&\n this.input.charCodeAt(this.state.pos) !== charCodes.exclamationMark\n ) {\n // In case we encounter an lt token here it will always be the start of\n // jsx as the lt sign is not allowed in places that expect an expression\n this.replaceToken(tt.jsxTagStart);\n return this.jsxParseElement();\n } else {\n return super.parseExprAtom(refExpressionErrors);\n }\n }\n\n skipSpace() {\n const curContext = this.curContext();\n if (!curContext.preserveSpace) super.skipSpace();\n }\n\n getTokenFromCode(code: number): void {\n const context = this.curContext();\n\n if (context === tc.j_expr) {\n this.jsxReadToken();\n return;\n }\n\n if (context === tc.j_oTag || context === tc.j_cTag) {\n if (isIdentifierStart(code)) {\n this.jsxReadWord();\n return;\n }\n\n if (code === charCodes.greaterThan) {\n ++this.state.pos;\n this.finishToken(tt.jsxTagEnd);\n return;\n }\n\n if (\n (code === charCodes.quotationMark || code === charCodes.apostrophe) &&\n context === tc.j_oTag\n ) {\n this.jsxReadString(code);\n return;\n }\n }\n\n if (\n code === charCodes.lessThan &&\n this.state.canStartJSXElement &&\n this.input.charCodeAt(this.state.pos + 1) !== charCodes.exclamationMark\n ) {\n ++this.state.pos;\n this.finishToken(tt.jsxTagStart);\n return;\n }\n\n super.getTokenFromCode(code);\n }\n\n updateContext(prevType: TokenType): void {\n const { context, type } = this.state;\n if (type === tt.slash && prevType === tt.jsxTagStart) {\n // do not consider JSX expr -> JSX open tag -> ... anymore\n // reconsider as closing tag context\n context.splice(-2, 2, tc.j_cTag);\n this.state.canStartJSXElement = false;\n } else if (type === tt.jsxTagStart) {\n // start opening tag context\n context.push(tc.j_oTag);\n } else if (type === tt.jsxTagEnd) {\n const out = context[context.length - 1];\n if ((out === tc.j_oTag && prevType === tt.slash) || out === tc.j_cTag) {\n context.pop();\n this.state.canStartJSXElement =\n context[context.length - 1] === tc.j_expr;\n } else {\n this.setContext(tc.j_expr);\n this.state.canStartJSXElement = true;\n }\n } else {\n this.state.canStartJSXElement = tokenComesBeforeExpression(type);\n }\n }\n };\n","import type { Position } from \"../../util/location.ts\";\nimport ScopeHandler, { NameType, Scope } from \"../../util/scope.ts\";\nimport { BindingFlag, ScopeFlag } from \"../../util/scopeflags.ts\";\nimport type * as N from \"../../types.ts\";\nimport { Errors } from \"../../parse-error.ts\";\n\nconst enum TsNameType {\n Types = 1 << 0,\n // enums (which are also in .types)\n Enums = 1 << 1,\n // const enums (which are also in .enums and .types)\n ConstEnums = 1 << 2,\n // classes (which are also in .lexical) and interface (which are also in .types)\n Classes = 1 << 3,\n // namespaces and ambient functions (or classes) are too difficult to track,\n // especially without type analysis.\n // We need to track them anyway, to avoid \"X is not defined\" errors\n // when exporting them.\n ExportOnlyBindings = 1 << 4,\n}\n\nclass TypeScriptScope extends Scope {\n tsNames: Map = new Map();\n}\n\n// See https://github.com/babel/babel/pull/9766#discussion_r268920730 for an\n// explanation of how typescript handles scope.\n\nexport default class TypeScriptScopeHandler extends ScopeHandler {\n importsStack: Set[] = [];\n\n createScope(flags: ScopeFlag): TypeScriptScope {\n this.importsStack.push(new Set()); // Always keep the top-level scope for export checks.\n\n return new TypeScriptScope(flags);\n }\n\n enter(flags: ScopeFlag): void {\n if (flags === ScopeFlag.TS_MODULE) {\n this.importsStack.push(new Set());\n }\n\n super.enter(flags);\n }\n\n exit() {\n const flags = super.exit();\n\n if (flags === ScopeFlag.TS_MODULE) {\n this.importsStack.pop();\n }\n\n return flags;\n }\n\n hasImport(name: string, allowShadow?: boolean) {\n const len = this.importsStack.length;\n if (this.importsStack[len - 1].has(name)) {\n return true;\n }\n if (!allowShadow && len > 1) {\n for (let i = 0; i < len - 1; i++) {\n if (this.importsStack[i].has(name)) return true;\n }\n }\n return false;\n }\n\n declareName(name: string, bindingType: BindingFlag, loc: Position) {\n if (bindingType & BindingFlag.FLAG_TS_IMPORT) {\n if (this.hasImport(name, true)) {\n this.parser.raise(Errors.VarRedeclaration, loc, {\n identifierName: name,\n });\n }\n this.importsStack[this.importsStack.length - 1].add(name);\n return;\n }\n\n const scope = this.currentScope();\n let type = scope.tsNames.get(name) || 0;\n\n if (bindingType & BindingFlag.FLAG_TS_EXPORT_ONLY) {\n this.maybeExportDefined(scope, name);\n scope.tsNames.set(name, type | TsNameType.ExportOnlyBindings);\n return;\n }\n\n super.declareName(name, bindingType, loc);\n\n if (bindingType & BindingFlag.KIND_TYPE) {\n if (!(bindingType & BindingFlag.KIND_VALUE)) {\n // \"Value\" bindings have already been registered by the superclass.\n this.checkRedeclarationInScope(scope, name, bindingType, loc);\n this.maybeExportDefined(scope, name);\n }\n type = type | TsNameType.Types;\n }\n if (bindingType & BindingFlag.FLAG_TS_ENUM) {\n type = type | TsNameType.Enums;\n }\n if (bindingType & BindingFlag.FLAG_TS_CONST_ENUM) {\n type = type | TsNameType.ConstEnums;\n }\n if (bindingType & BindingFlag.FLAG_CLASS) {\n type = type | TsNameType.Classes;\n }\n if (type) scope.tsNames.set(name, type);\n }\n\n isRedeclaredInScope(\n scope: TypeScriptScope,\n name: string,\n bindingType: BindingFlag,\n ): boolean {\n const type = scope.tsNames.get(name);\n if ((type & TsNameType.Enums) > 0) {\n if (bindingType & BindingFlag.FLAG_TS_ENUM) {\n // Enums can be merged with other enums if they are both\n // const or both non-const.\n const isConst = !!(bindingType & BindingFlag.FLAG_TS_CONST_ENUM);\n const wasConst = (type & TsNameType.ConstEnums) > 0;\n return isConst !== wasConst;\n }\n return true;\n }\n if (\n bindingType & BindingFlag.FLAG_CLASS &&\n (type & TsNameType.Classes) > 0\n ) {\n if (scope.names.get(name) & NameType.Lexical) {\n // Classes can be merged with interfaces\n return !!(bindingType & BindingFlag.KIND_VALUE);\n } else {\n // Interface can be merged with other classes or interfaces\n return false;\n }\n }\n if (bindingType & BindingFlag.KIND_TYPE && (type & TsNameType.Types) > 0) {\n return true;\n }\n\n return super.isRedeclaredInScope(scope, name, bindingType);\n }\n\n checkLocalExport(id: N.Identifier) {\n const { name } = id;\n\n if (this.hasImport(name)) return;\n\n const len = this.scopeStack.length;\n for (let i = len - 1; i >= 0; i--) {\n const scope = this.scopeStack[i];\n const type = scope.tsNames.get(name);\n if (\n (type & TsNameType.Types) > 0 ||\n (type & TsNameType.ExportOnlyBindings) > 0\n ) {\n return;\n }\n }\n\n super.checkLocalExport(id);\n }\n}\n","// ProductionParameterHandler is a stack fashioned production parameter tracker\n// https://tc39.es/ecma262/#sec-grammar-notation\n// The tracked parameters are defined above.\n//\n// Whenever [+Await]/[+Yield] appears in the right-hand sides of a production,\n// we must enter a new tracking stack. For example when parsing\n//\n// AsyncFunctionDeclaration [Yield, Await]:\n// async [no LineTerminator here] function BindingIdentifier[?Yield, ?Await]\n// ( FormalParameters[~Yield, +Await] ) { AsyncFunctionBody }\n//\n// we must follow such process:\n//\n// 1. parse async keyword\n// 2. parse function keyword\n// 3. parse bindingIdentifier <= inherit current parameters: [?Await]\n// 4. enter new stack with (PARAM_AWAIT)\n// 5. parse formal parameters <= must have [Await] parameter [+Await]\n// 6. parse function body\n// 7. exit current stack\n\nexport const enum ParamKind {\n // Initial Parameter flags\n PARAM = 0b0000,\n // track [Yield] production parameter\n PARAM_YIELD = 0b0001,\n // track [Await] production parameter\n PARAM_AWAIT = 0b0010,\n // track [Return] production parameter\n PARAM_RETURN = 0b0100,\n // track [In] production parameter\n PARAM_IN = 0b1000,\n}\n\n// todo(flow->ts) - check if more granular type can be used,\n// type below is not good because things like PARAM_AWAIT|PARAM_YIELD are not included\n// export type ParamKind =\n// | typeof PARAM\n// | typeof PARAM_AWAIT\n// | typeof PARAM_IN\n// | typeof PARAM_RETURN\n// | typeof PARAM_YIELD;\n\nexport default class ProductionParameterHandler {\n stacks: Array = [];\n enter(flags: ParamKind) {\n this.stacks.push(flags);\n }\n\n exit() {\n this.stacks.pop();\n }\n\n currentFlags(): ParamKind {\n return this.stacks[this.stacks.length - 1];\n }\n\n get hasAwait(): boolean {\n return (this.currentFlags() & ParamKind.PARAM_AWAIT) > 0;\n }\n\n get hasYield(): boolean {\n return (this.currentFlags() & ParamKind.PARAM_YIELD) > 0;\n }\n\n get hasReturn(): boolean {\n return (this.currentFlags() & ParamKind.PARAM_RETURN) > 0;\n }\n\n get hasIn(): boolean {\n return (this.currentFlags() & ParamKind.PARAM_IN) > 0;\n }\n}\n\nexport function functionFlags(\n isAsync: boolean,\n isGenerator: boolean,\n): ParamKind {\n return (\n (isAsync ? ParamKind.PARAM_AWAIT : 0) |\n (isGenerator ? ParamKind.PARAM_YIELD : 0)\n );\n}\n","import type { OptionFlags, Options } from \"../options.ts\";\nimport type State from \"../tokenizer/state.ts\";\nimport type { PluginsMap } from \"./index.ts\";\nimport type ScopeHandler from \"../util/scope.ts\";\nimport type ExpressionScopeHandler from \"../util/expression-scope.ts\";\nimport type ClassScopeHandler from \"../util/class-scope.ts\";\nimport type ProductionParameterHandler from \"../util/production-parameter.ts\";\nimport type {\n ParserPluginWithOptions,\n PluginConfig,\n PluginOptions,\n} from \"../typings.ts\";\nimport type * as N from \"../types.ts\";\n\nexport default class BaseParser {\n // Properties set by constructor in index.js\n declare options: Options;\n declare optionFlags: OptionFlags;\n declare inModule: boolean;\n declare scope: ScopeHandler;\n declare classScope: ClassScopeHandler;\n declare prodParam: ProductionParameterHandler;\n declare expressionScope: ExpressionScopeHandler;\n declare plugins: PluginsMap;\n declare filename: string | undefined | null;\n declare startIndex: number;\n // Names of exports store. `default` is stored as a name for both\n // `export default foo;` and `export { foo as default };`.\n declare exportedIdentifiers: Set;\n sawUnambiguousESM: boolean = false;\n ambiguousScriptDifferentAst: boolean = false;\n\n // Initialized by Tokenizer\n declare state: State;\n // input and length are not in state as they are constant and we do\n // not want to ever copy them, which happens if state gets cloned\n declare input: string;\n declare length: number;\n // Comment store for Program.comments\n declare comments: Array;\n\n sourceToOffsetPos(sourcePos: number) {\n return sourcePos + this.startIndex;\n }\n\n offsetToSourcePos(offsetPos: number) {\n return offsetPos - this.startIndex;\n }\n\n // This method accepts either a string (plugin name) or an array pair\n // (plugin name and options object). If an options object is given,\n // then each value is non-recursively checked for identity with that\n // plugin’s actual option value.\n hasPlugin(pluginConfig: PluginConfig): boolean {\n if (typeof pluginConfig === \"string\") {\n return this.plugins.has(pluginConfig);\n } else {\n const [pluginName, pluginOptions] = pluginConfig;\n if (!this.hasPlugin(pluginName)) {\n return false;\n }\n const actualOptions = this.plugins.get(pluginName);\n for (const key of Object.keys(\n pluginOptions,\n ) as (keyof typeof pluginOptions)[]) {\n if (actualOptions?.[key] !== pluginOptions[key]) {\n return false;\n }\n }\n return true;\n }\n }\n\n getPluginOption<\n PluginName extends ParserPluginWithOptions[0],\n OptionName extends keyof PluginOptions,\n >(plugin: PluginName, name: OptionName) {\n return (this.plugins.get(plugin) as null | PluginOptions)?.[\n name\n ];\n }\n}\n","/*:: declare var invariant; */\n\nimport BaseParser from \"./base.ts\";\nimport type { Comment, Node } from \"../types.ts\";\nimport * as charCodes from \"charcodes\";\nimport type { Undone } from \"./node.ts\";\n\n/**\n * A whitespace token containing comments\n */\nexport type CommentWhitespace = {\n /**\n * the start of the whitespace token.\n */\n start: number;\n /**\n * the end of the whitespace token.\n */\n end: number;\n /**\n * the containing comments\n */\n comments: Array;\n /**\n * the immediately preceding AST node of the whitespace token\n */\n leadingNode: Node | null;\n /**\n * the immediately following AST node of the whitespace token\n */\n trailingNode: Node | null;\n /**\n * the innermost AST node containing the whitespace with minimal size (|end - start|)\n */\n containingNode: Node | null;\n};\n\n/**\n * Merge comments with node's trailingComments or assign comments to be\n * trailingComments. New comments will be placed before old comments\n * because the commentStack is enumerated reversely.\n */\nfunction setTrailingComments(node: Undone, comments: Array) {\n if (node.trailingComments === undefined) {\n node.trailingComments = comments;\n } else {\n node.trailingComments.unshift(...comments);\n }\n}\n\n/**\n * Merge comments with node's leadingComments or assign comments to be\n * leadingComments. New comments will be placed before old comments\n * because the commentStack is enumerated reversely.\n */\nfunction setLeadingComments(node: Undone, comments: Array) {\n if (node.leadingComments === undefined) {\n node.leadingComments = comments;\n } else {\n node.leadingComments.unshift(...comments);\n }\n}\n\n/**\n * Merge comments with node's innerComments or assign comments to be\n * innerComments. New comments will be placed before old comments\n * because the commentStack is enumerated reversely.\n */\nexport function setInnerComments(\n node: Undone,\n comments?: Array,\n) {\n if (node.innerComments === undefined) {\n node.innerComments = comments;\n } else {\n node.innerComments.unshift(...comments);\n }\n}\n\n/**\n * Given node and elements array, if elements has non-null element,\n * merge comments to its trailingComments, otherwise merge comments\n * to node's innerComments\n */\nfunction adjustInnerComments(\n node: Undone,\n elements: Array