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60 KiB
4 weeks ago
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{"version":3,"file":"index.js","sources":["../src/util.ts","../src/index.ts"],"sourcesContent":["import { types as t, template } from \"@babel/core\";\nimport type { File, Scope, NodePath } from \"@babel/core\";\n\nfunction isPureVoid(node: t.Node) {\n return (\n t.isUnaryExpression(node) &&\n node.operator === \"void\" &&\n t.isPureish(node.argument)\n );\n}\n\nexport function unshiftForXStatementBody(\n statementPath: NodePath<t.ForXStatement>,\n newStatements: t.Statement[],\n) {\n statementPath.ensureBlock();\n const { scope, node } = statementPath;\n const bodyScopeBindings = statementPath.get(\"body\").scope.bindings;\n const hasShadowedBlockScopedBindings = Object.keys(bodyScopeBindings).some(\n name => scope.hasBinding(name),\n );\n\n if (hasShadowedBlockScopedBindings) {\n // handle shadowed variables referenced in computed keys:\n // var a = 0;for (const { #x: x, [a++]: y } of z) { const a = 1; }\n node.body = t.blockStatement([...newStatements, node.body]);\n } else {\n (node.body as t.BlockStatement).body.unshift(...newStatements);\n }\n}\n\n/**\n * Test if an ArrayPattern's elements contain any RestElements.\n */\n\nfunction hasArrayRest(pattern: t.ArrayPattern) {\n return pattern.elements.some(elem => t.isRestElement(elem));\n}\n\n/**\n * Test if an ObjectPattern's properties contain any RestElements.\n */\n\nfunction hasObjectRest(pattern: t.ObjectPattern) {\n return pattern.properties.some(prop => t.isRestElement(prop));\n}\n\ninterface UnpackableArrayExpression extends t.ArrayExpression {\n elements: (null | t.Expression)[];\n}\n\nconst STOP_TRAVERSAL = {};\n\ninterface ArrayUnpackVisitorState {\n deopt: boolean;\n bindings: Record<string, t.Identifier>;\n}\n\n// NOTE: This visitor is meant to be used via t.traverse\nconst arrayUnpackVisitor = (\n node: t.Node,\n ancestors: t.TraversalAncestors,\n state: ArrayUnpackVisitorState,\n) => {\n if (!ancestors.length) {\n // Top-level node: this is the array literal.\n return;\n }\n\n if (\n t.isIdentifier(node) &&\n t.isReferenced(node, ancestors[ancestors.length - 1].node) &&\n state.bindings[node.name]\n ) {\n state.deopt = true;\n // eslint-disable-next-line @typescript-eslint/only-throw-error\n throw STOP_TRAVERSAL;\n }\n};\n\nexport type DestructuringTransformerNode =\n | t.VariableDeclaration\n | t.ExpressionStatement\n | t.ReturnStatement;\n\ninterface DestructuringTransformerOption {\n blockHoist?: number;\n operator?: t.AssignmentExpression[\"operator\"];\n nodes?: DestructuringTransformerNode[];\n kind?: t.VariableDeclaration[\"kind\"];\n scope: Scope;\n arrayLikeIsIterable: boolean;\n iterableIsArray: boolean;\n objectRestNoSymbols: boolean;\n useBuiltIns: boolean;\n addHelper: File[\"addHelper\"];\n}\nexport class DestructuringTransformer {\n private blockHoist: number;\n private operator: t.AssignmentExpression[\"operator\"];\n arrayRefSet: Set<string>;\n private nodes: DestructuringTransformerNode[];\n private scope: Scope;\n private kind: t.VariableDeclaration[\"kind\"];\n private iterableIsArray: boolean;\n private arrayLikeIsIterable: boolean;\n private objectRestNoSymbols: boolean;\n private useBuiltIns: boolean;\n private addHelper: File[\"addHelper\"];\n constructor(opts: DestructuringTransformerOption) {\n this.blockHoist = opts.blockHoist;\n this.operator = opts.operator;\n this.arrayRefSet = new Set();\n this.nodes = opts.nodes || [];\n this.scope = opts.scope;\n this.kind = opts.kind;\n this.iterableIsArray = opts.iterableIsArray;\n this.arrayLikeIsIterable = opts.arrayLikeIsIterable;\n this.objectRestNoSymbols = opts.objectRestNoSymbols;\n this.useBuiltIns = opts.useBuiltIns;\n this.addHelper = opts.addHelper;\n }\n\n getExtendsHelper() {\n return this.useBuiltIns\n ? t.memberExpression(t.identifier(\"Object\"), t.identifier(\"assign\"))\n : this.addHelper(\"extends\");\n }\n\n buildVariableAssignment(\n id: t.AssignmentExpression[\"left\"],\n init: t.Expression,\n ) {\n let op =
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