{"version":3,"names":["_t","require","_util","BOOLEAN_NUMBER_BINARY_OPERATORS","createTypeAnnotationBasedOnTypeof","numberTypeAnnotation","voidTypeAnnotation","_default","node","isReferenced","binding","scope","getBinding","name","identifier","typeAnnotation","getTypeAnnotationBindingConstantViolations","path","types","functionConstantViolations","constantViolations","getConstantViolationsBefore","testType","getConditionalAnnotation","testConstantViolations","ifStatement","filter","indexOf","push","length","violation","getTypeAnnotation","createUnionType","functions","violations","slice","unshift","resolve","status","_guessExecutionStatusRelativeTo","inferAnnotationFromBinaryExpression","operator","right","get","left","target","isIdentifier","typeofPath","typePath","isUnaryExpression","isLiteral","typeValue","value","getParentConditionalPath","parentPath","isIfStatement","isConditionalExpression","key","isFunction","test","paths","i","isLogicalExpression","isBinaryExpression","type"],"sources":["../../../src/path/inference/inferer-reference.ts"],"sourcesContent":["import type NodePath from \"../index.ts\";\nimport {\n  BOOLEAN_NUMBER_BINARY_OPERATORS,\n  createTypeAnnotationBasedOnTypeof,\n  numberTypeAnnotation,\n  voidTypeAnnotation,\n} from \"@babel/types\";\nimport type * as t from \"@babel/types\";\nimport type Binding from \"../../scope/binding.ts\";\n\nimport { createUnionType } from \"./util.ts\";\n\nexport default function (this: NodePath<t.Identifier>, node: t.Identifier) {\n  if (!this.isReferenced()) return;\n\n  // check if a binding exists of this value and if so then return a union type of all\n  // possible types that the binding could be\n  const binding = this.scope.getBinding(node.name);\n  if (binding) {\n    if (binding.identifier.typeAnnotation) {\n      return binding.identifier.typeAnnotation;\n    } else {\n      return getTypeAnnotationBindingConstantViolations(\n        binding,\n        this,\n        node.name,\n      );\n    }\n  }\n\n  // built-in values\n  if (node.name === \"undefined\") {\n    return voidTypeAnnotation();\n  } else if (node.name === \"NaN\" || node.name === \"Infinity\") {\n    return numberTypeAnnotation();\n  } else if (node.name === \"arguments\") {\n    // todo\n  }\n}\n\nfunction getTypeAnnotationBindingConstantViolations(\n  binding: Binding,\n  path: NodePath<t.Identifier>,\n  name: string,\n) {\n  const types = [];\n\n  const functionConstantViolations: NodePath[] = [];\n  let constantViolations = getConstantViolationsBefore(\n    binding,\n    path,\n    functionConstantViolations,\n  );\n\n  const testType = getConditionalAnnotation(binding, path, name);\n  if (testType) {\n    const testConstantViolations = getConstantViolationsBefore(\n      binding,\n      testType.ifStatement,\n    );\n\n    // remove constant violations observed before the IfStatement\n    constantViolations = constantViolations.filter(\n      path => testConstantViolations.indexOf(path) < 0,\n    );\n\n    // clear current types and add in observed test type\n    types.push(testType.typeAnnotation);\n  }\n\n  if (constantViolations.length) {\n    // pick one constant from each scope which will represent the last possible\n    // control flow path that it could've taken/been\n    /* This code is broken for the following problems:\n     * It thinks that assignments can only happen in scopes.\n     * What about conditionals, if statements without block,\n     * or guarded assignments.\n     * It also checks to see if one of the assignments is in the\n     * same scope and uses that as the only \"violation\". However,\n     * the binding is returned by `getConstantViolationsBefore` so we for\n     * sure always going to return that as the only \"violation\".\n    let rawConstantViolations = constantViolations.reverse();\n    let visitedScopes = [];\n    constantViolations = [];\n    for (let violation of (rawConstantViolations: Array<NodePath>)) {\n      let violationScope = violation.scope;\n      if (visitedScopes.indexOf(violationScope) >= 0) continue;\n\n      visitedScopes.push(violationScope);\n      constantViolations.push(violation);\n\n      if (violationScope === path.scope) {\n        constantViolations = [violation];\n        break;\n      }\n    }*/\n\n    // add back on function constant violations since we can't track calls\n    constantViolations.push(...functionConstantViolations);\n\n    // push on inferred types of violated paths\n    for (const violation of constantViolations) {\n      types.push(violation.getTypeAnnotation());\n    }\n  }\n\n  if (!types.length) {\n    return;\n  }\n\n  return createUnionType(types);\n}\n\nfunction getConstantViolationsBefore(\n  binding: Binding,\n  path: NodePath,\n  functions?: NodePath[],\n) {\n  const violations = binding.constantViolations.slice();\n  violations.unshift(binding.path);\n  return violations.filter(violation => {\n    violation = violation.resolve();\n    const status = violation._guessExecutionStatusRelativeTo(path);\n    if (functions && status === \"unknown\") functions.push(violation);\n    return status === \"before\";\n  });\n}\n\nfunction inferAnnotationFromBinaryExpression(\n  name: string,\n  path: NodePath<t.BinaryExpression>,\n) {\n  const operator = path.node.operator;\n\n  const right = path.get(\"right\").resolve();\n  const left = path.get(\"left\").resolve();\n\n  let target;\n  if (left.isIdentifier({ name })) {\n    target = right;\n  } else if (right.isIdentifier({ name })) {\n    target = left;\n  }\n\n  if (target) {\n    if (operator === \"===\") {\n      return target.getTypeAnnotation();\n    }\n    if (BOOLEAN_NUMBER_BINARY_OPERATORS.indexOf(operator) >= 0) {\n      return numberTypeAnnotation();\n    }\n\n    return;\n  }\n\n  if (operator !== \"===\" && operator !== \"==\") return;\n\n  //\n  let typeofPath: NodePath<t.UnaryExpression>;\n  let typePath: NodePath<t.Expression>;\n  if (left.isUnaryExpression({ operator: \"typeof\" })) {\n    typeofPath = left;\n    typePath = right as NodePath<t.Expression>;\n  } else if (right.isUnaryExpression({ operator: \"typeof\" })) {\n    typeofPath = right;\n    typePath = left as NodePath<t.Expression>;\n  }\n\n  if (!typeofPath) return;\n  // and that the argument of the typeof path references us!\n  if (!typeofPath.get(\"argument\").isIdentifier({ name })) return;\n\n  // ensure that the type path is a Literal\n  typePath = typePath.resolve() as NodePath<t.Expression>;\n  if (!typePath.isLiteral()) return;\n\n  // and that it's a string so we can infer it\n  // @ts-expect-error todo(flow->ts): value is not defined for NullLiteral and some other\n  const typeValue = typePath.node.value;\n  if (typeof typeValue !== \"string\") return;\n\n  // turn type value into a type annotation\n  // @ts-expect-error todo(flow->ts): move validation from helper or relax type constraint to just a string\n  return createTypeAnnotationBasedOnTypeof(typeValue);\n}\n\nfunction getParentConditionalPath(\n  binding: Binding,\n  path: NodePath,\n  name: string,\n) {\n  let parentPath;\n  while ((parentPath = path.parentPath)) {\n    if (parentPath.isIfStatement() || parentPath.isConditionalExpression()) {\n      if (path.key === \"test\") {\n        return;\n      }\n\n      return parentPath as NodePath<t.IfStatement | t.ConditionalExpression>;\n    }\n    if (parentPath.isFunction()) {\n      if (parentPath.parentPath.scope.getBinding(name) !== binding) return;\n    }\n\n    path = parentPath;\n  }\n}\n\nfunction getConditionalAnnotation<T extends t.Node>(\n  binding: Binding,\n  path: NodePath<T>,\n  name?: string,\n): {\n  typeAnnotation: t.FlowType | t.TSType;\n  ifStatement: NodePath<t.IfStatement | t.ConditionalExpression>;\n} {\n  const ifStatement = getParentConditionalPath(binding, path, name);\n  if (!ifStatement) return;\n\n  const test = ifStatement.get(\"test\");\n  const paths = [test];\n  const types = [];\n\n  for (let i = 0; i < paths.length; i++) {\n    const path = paths[i];\n\n    if (path.isLogicalExpression()) {\n      if (path.node.operator === \"&&\") {\n        paths.push(path.get(\"left\"));\n        paths.push(path.get(\"right\"));\n      }\n    } else if (path.isBinaryExpression()) {\n      const type = inferAnnotationFromBinaryExpression(name, path);\n      if (type) types.push(type);\n    }\n  }\n\n  if (types.length) {\n    return {\n      typeAnnotation: createUnionType(types),\n      ifStatement,\n    };\n  }\n\n  return getConditionalAnnotation(binding, ifStatement, 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