{"version":3,"file":"index.js","sources":["../src/util.ts","../src/index.ts"],"sourcesContent":["import type { NodePath, Visitor } from \"@babel/traverse\";\nimport { types as t } from \"@babel/core\";\nimport { requeueComputedKeyAndDecorators } from \"@babel/helper-environment-visitor\";\n\nfunction isNameOrLength(key: t.Node): boolean {\n if (t.isIdentifier(key)) {\n return key.name === \"name\" || key.name === \"length\";\n }\n if (t.isStringLiteral(key)) {\n return key.value === \"name\" || key.value === \"length\";\n }\n return false;\n}\n\nfunction isStaticFieldWithValue(\n node: t.Node,\n): node is t.ClassProperty | t.ClassPrivateProperty {\n return (\n (t.isClassProperty(node) || t.isClassPrivateProperty(node)) &&\n node.static &&\n !!node.value\n );\n}\n\nconst hasReferenceVisitor: Visitor<{ name: string; ref: () => void }> = {\n ReferencedIdentifier(path, state) {\n if (path.node.name === state.name) {\n state.ref();\n path.stop();\n }\n },\n Scope(path, { name }) {\n if (path.scope.hasOwnBinding(name)) {\n path.skip();\n }\n },\n};\n\nfunction isReferenceOrThis(node: t.Node, name?: string) {\n return t.isThisExpression(node) || (name && t.isIdentifier(node, { name }));\n}\n\nconst hasReferenceOrThisVisitor: Visitor<{ name?: string; ref: () => void }> = {\n \"ThisExpression|ReferencedIdentifier\"(path, state) {\n if (isReferenceOrThis(path.node, state.name)) {\n state.ref();\n path.stop();\n }\n },\n FunctionParent(path, state) {\n if (path.isArrowFunctionExpression()) return;\n if (state.name && !path.scope.hasOwnBinding(state.name)) {\n path.traverse(hasReferenceVisitor, state);\n }\n path.skip();\n if (path.isMethod()) {\n requeueComputedKeyAndDecorators(path);\n }\n },\n};\n\ntype ClassElementWithComputedKeySupport = Extract<\n t.ClassBody[\"body\"][number],\n { computed?: boolean }\n>;\n\n/**\n * This function returns an array containing the indexes of class elements\n * that might be affected by https://crbug.com/v8/12421 bug.\n *\n * This bug affects public static class fields that have the same name as an\n * existing non-writable property with the same name. 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We must also compile static\n * fields with computed key, because they might end up being named 'length' or\n * 'name'.\n *\n * However, this bug can potentially affect public static fields with any name.\n * Consider this example:\n *\n * class A {\n * static {\n * Object.defineProperty(A, \"readonly\", {\n * value: 1,\n * writable: false,\n * configurable: true\n * })\n * }\n *\n * static readonly = 2;\n * }\n *\n * When initializing the 'static readonly' field, the class already has a\n * non-writable property named 'readonly' and thus V8 9.7 incorrectly throws.\n *\n * To avoid unconditionally compiling every public static field, we track how\n * the class is referenced during definition & static evaluation: any side\n * effect after a reference to the class can potentially define a non-writable\n * conficting property, so subsequent public static fields must be compiled.\n * The class could be referenced using the class name in computed keys, which\n * run before static fields, or using either the class name or 'this' in static\n * fields (both public and private) and static blocks.\n *\n * We don't need to check if computed keys referencing the class have any side\n * effect, because during the computed keys evaluation the internal class\n * binding is in TDZ. However, the first side effect in a static field/block\n * could have access to a function defined in a computed key that modifies the\n * class.\n *\n * This logic is already quite complex, so we assume that static blocks always\n * have side effects and reference the class (the reason to use them is to\n * perform additional initialization logic on the class anyway), so that we do\n * not have to check their contents.\n */\nexport function getPotentiallyBuggyFieldsIndexes(path: NodePath) {\n const buggyPublicStaticFieldsIndexes: number[] = [];\n\n let classReferenced = false;\n const className = path.node.id?.name;\n\n const hasReferenceState = {\n name: className,\n ref: () => (classReferenced = true),\n };\n\n if (className) {\n for (const el of path.get(\"body.body\")) {\n if ((el.node as ClassElementWithComputedKeySupport).computed) {\n // Since .traverse skips the top-level node, it doesn't detect\n // a reference happening immediately:\n // class A { [A]() {} }\n // However, it's a TDZ error so it's ok not to consider this case.\n (el as NodePath)\n .get(\"key\")\n .traverse(hasReferenceVisitor, hasReferenceState);\n\n if (classReferenced) break;\n }\n }\n }\n\n let nextPotentiallyBuggy = false;\n\n const { body } = path.node.body;\n for (let i = 0; i < body.length; i++) {\n const node = body[i];\n\n if (!nextPotentiallyBuggy) {\n if (t.isStaticBlock(node)) {\n classReferenced = true;\n nextPotentiallyBuggy = true;\n } else if (isStaticFieldWithValue(node)) {\n if (!classReferenced) {\n if (isReferenceOrThis(node.value, className)) {\n classReferenced = true;\n } else {\n (\n path.get(`body.body.${i}.value`) as NodePath\n ).traverse(hasReferenceOrThisVisitor, hasReferenceState);\n }\n }\n\n if (classReferenced) {\n nextPotentiallyBuggy = !path.scope.isPure(node.value);\n }\n }\n }\n\n if (\n t.isClassProperty(node, { static: true }) &&\n (nextPotentiallyBuggy || node.computed || isNameOrLength(node.key))\n ) {\n buggyPublicStaticFieldsIndexes.push(i);\n }\n }\n\n return buggyPublicStaticFieldsIndexes;\n}\n\nexport function getNameOrLengthStaticFieldsIndexes(path: NodePath) {\n const indexes: number[] = [];\n\n const { body } = path.node.body;\n for (let i = 0; i < body.length; i++) {\n const node = body[i];\n if (\n t.isClassProperty(node, { static: true, computed: false }) &&\n isNameOrLength(node.key)\n ) {\n indexes.push(i);\n }\n }\n\n return indexes;\n}\n\ntype Range = [start: number, end: number];\n\n/**\n * Converts a sorted list of numbers into a list of (inclusive-exclusive)\n * ranges representing the same numbers.\n *\n * @example toRanges([1, 3, 4, 5, 8, 9]) -> [[1, 2], [3, 6], [8, 10]]\n */\nexport function toRanges(nums: number[]): Range[] {\n const ranges: Range[] = [];\n\n if (nums.length === 0) return ranges;\n\n let start = nums[0];\n let end = start + 1;\n for (let i = 1; i < nums.length; i++) {\n if (nums[i] <= nums[i - 1]) {\n throw new Error(\"Internal Babel error: nums must be in ascending order\");\n }\n if (nums[i] === end) {\n end++;\n } else {\n ranges.push([start, end]);\n start = nums[i];\n end = start + 1;\n }\n }\n ranges.push([start, end]);\n\n return ranges;\n}\n","import type { NodePath, Scope } from \"@babel/traverse\";\nimport { types as t, type PluginPass, type File } from \"@babel/core\";\nimport { declare } from \"@babel/helper-plugin-utils\";\n\nimport {\n getPotentiallyBuggyFieldsIndexes,\n getNameOrLengthStaticFieldsIndexes,\n toRanges,\n} from \"./util.ts\";\n\nfunction buildFieldsReplacement(\n fields: t.ClassProperty[],\n scope: Scope,\n file: File,\n) {\n return t.staticBlock(\n fields.map(field => {\n const key =\n field.computed || !t.isIdentifier(field.key)\n ? field.key\n : t.stringLiteral(field.key.name);\n\n return t.expressionStatement(\n t.callExpression(file.addHelper(\"defineProperty\"), [\n t.thisExpression(),\n key,\n field.value || scope.buildUndefinedNode(),\n ]),\n );\n }),\n );\n}\n\nexport default declare(api => {\n api.assertVersion(\n process.env.BABEL_8_BREAKING && process.env.IS_PUBLISH\n ? 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