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scope.js
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scope.js
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// @flow
import ScopeHandler, { Scope } from "../../util/scope";
import {
BIND_KIND_TYPE,
BIND_FLAGS_TS_ENUM,
BIND_FLAGS_TS_CONST_ENUM,
BIND_FLAGS_TS_EXPORT_ONLY,
BIND_KIND_VALUE,
BIND_FLAGS_CLASS,
type ScopeFlags,
type BindingTypes,
} from "../../util/scopeflags";
import * as N from "../../types";
class TypeScriptScope extends Scope {
types: string[] = [];
// enums (which are also in .types)
enums: string[] = [];
// const enums (which are also in .enums and .types)
constEnums: string[] = [];
// classes (which are also in .lexical) and interface (which are also in .types)
classes: string[] = [];
// namespaces and bodyless-functions are too difficult to track,
// especially without type analysis.
// We need to track them anyway, to avoid "X is not defined" errors
// when exporting them.
exportOnlyBindings: string[] = [];
}
// See https://github.com/babel/babel/pull/9766#discussion_r268920730 for an
// explanation of how typescript handles scope.
export default class TypeScriptScopeHandler extends ScopeHandler<TypeScriptScope> {
createScope(flags: ScopeFlags): TypeScriptScope {
return new TypeScriptScope(flags);
}
declareName(name: string, bindingType: BindingTypes, pos: number) {
const scope = this.currentScope();
if (bindingType & BIND_FLAGS_TS_EXPORT_ONLY) {
this.maybeExportDefined(scope, name);
scope.exportOnlyBindings.push(name);
return;
}
super.declareName(...arguments);
if (bindingType & BIND_KIND_TYPE) {
if (!(bindingType & BIND_KIND_VALUE)) {
// "Value" bindings have already been registered by the superclass.
this.checkRedeclarationInScope(scope, name, bindingType, pos);
this.maybeExportDefined(scope, name);
}
scope.types.push(name);
}
if (bindingType & BIND_FLAGS_TS_ENUM) scope.enums.push(name);
if (bindingType & BIND_FLAGS_TS_CONST_ENUM) scope.constEnums.push(name);
if (bindingType & BIND_FLAGS_CLASS) scope.classes.push(name);
}
isRedeclaredInScope(
scope: TypeScriptScope,
name: string,
bindingType: BindingTypes,
): boolean {
if (scope.enums.indexOf(name) > -1) {
if (bindingType & BIND_FLAGS_TS_ENUM) {
// Enums can be merged with other enums if they are both
// const or both non-const.
const isConst = !!(bindingType & BIND_FLAGS_TS_CONST_ENUM);
const wasConst = scope.constEnums.indexOf(name) > -1;
return isConst !== wasConst;
}
return true;
}
if (bindingType & BIND_FLAGS_CLASS && scope.classes.indexOf(name) > -1) {
if (scope.lexical.indexOf(name) > -1) {
// Classes can be merged with interfaces
return !!(bindingType & BIND_KIND_VALUE);
} else {
// Interface can be merged with other classes or interfaces
return false;
}
}
if (bindingType & BIND_KIND_TYPE && scope.types.indexOf(name) > -1) {
return true;
}
return super.isRedeclaredInScope(...arguments);
}
checkLocalExport(id: N.Identifier) {
if (
this.scopeStack[0].types.indexOf(id.name) === -1 &&
this.scopeStack[0].exportOnlyBindings.indexOf(id.name) === -1
) {
super.checkLocalExport(id);
}
}
}