forked from babel/babel
/
index.ts
102 lines (85 loc) 路 2.89 KB
/
index.ts
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import { declare } from "@babel/helper-plugin-utils";
import { isRequired } from "@babel/helper-compilation-targets";
import annotateAsPure from "@babel/helper-annotate-as-pure";
import nameFunction from "@babel/helper-function-name";
import splitExportDeclaration from "@babel/helper-split-export-declaration";
import { types as t } from "@babel/core";
import globals from "globals";
import transformClass from "./transformClass";
const getBuiltinClasses = (category: keyof typeof globals) =>
Object.keys(globals[category]).filter(name => /^[A-Z]/.test(name));
const builtinClasses = new Set([
...getBuiltinClasses("builtin"),
...getBuiltinClasses("browser"),
]);
export interface Options {
loose?: boolean;
}
export default declare((api, options: Options) => {
api.assertVersion(7);
const { loose = false } = options;
const setClassMethods = (api.assumption("setClassMethods") ??
loose) as boolean;
const constantSuper = (api.assumption("constantSuper") ?? loose) as boolean;
const superIsCallableConstructor = (api.assumption(
"superIsCallableConstructor",
) ?? loose) as boolean;
const noClassCalls = (api.assumption("noClassCalls") ?? loose) as boolean;
const supportUnicodeId = !isRequired(
"transform-unicode-escapes",
api.targets(),
);
// todo: investigate traversal requeueing
const VISITED = new WeakSet();
return {
name: "transform-classes",
visitor: {
ExportDefaultDeclaration(path) {
if (!path.get("declaration").isClassDeclaration()) return;
splitExportDeclaration(path);
},
ClassDeclaration(path) {
const { node } = path;
const ref = node.id || path.scope.generateUidIdentifier("class");
path.replaceWith(
t.variableDeclaration("let", [
t.variableDeclarator(ref, t.toExpression(node)),
]),
);
},
ClassExpression(path, state) {
const { node } = path;
if (VISITED.has(node)) return;
const inferred = nameFunction(path, undefined, supportUnicodeId);
if (inferred && inferred !== node) {
path.replaceWith(inferred);
return;
}
VISITED.add(node);
const [replacedPath] = path.replaceWith(
transformClass(
path,
state.file,
builtinClasses,
loose,
{
setClassMethods,
constantSuper,
superIsCallableConstructor,
noClassCalls,
},
supportUnicodeId,
),
);
if (replacedPath.isCallExpression()) {
annotateAsPure(replacedPath);
const callee = replacedPath.get("callee");
if (callee.isArrowFunctionExpression()) {
// This is an IIFE, so we don't need to worry about the noNewArrows assumption
callee.arrowFunctionToExpression();
}
}
},
},
};
});