72 lines
1.9 KiB
JavaScript
72 lines
1.9 KiB
JavaScript
import { declare } from "@babel/helper-plugin-utils";
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import LooseTransformer from "./loose";
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import VanillaTransformer from "./vanilla";
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import annotateAsPure from "@babel/helper-annotate-as-pure";
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import nameFunction from "@babel/helper-function-name";
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import splitExportDeclaration from "@babel/helper-split-export-declaration";
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import { types as t } from "@babel/core";
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import globals from "globals";
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const getBuiltinClasses = category =>
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Object.keys(globals[category]).filter(name => /^[A-Z]/.test(name));
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const builtinClasses = new Set([
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...getBuiltinClasses("builtin"),
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...getBuiltinClasses("browser"),
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]);
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export default declare((api, options) => {
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api.assertVersion(7);
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const { loose } = options;
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const Constructor = loose ? LooseTransformer : VanillaTransformer;
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// todo: investigate traversal requeueing
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const VISITED = Symbol();
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return {
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visitor: {
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ExportDefaultDeclaration(path) {
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if (!path.get("declaration").isClassDeclaration()) return;
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splitExportDeclaration(path);
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},
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ClassDeclaration(path) {
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const { node } = path;
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const ref = node.id || path.scope.generateUidIdentifier("class");
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path.replaceWith(
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t.variableDeclaration("let", [
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t.variableDeclarator(ref, t.toExpression(node)),
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]),
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);
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},
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ClassExpression(path, state) {
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const { node } = path;
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if (node[VISITED]) return;
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const inferred = nameFunction(path);
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if (inferred && inferred !== node) {
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path.replaceWith(inferred);
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return;
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}
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node[VISITED] = true;
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path.replaceWith(
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new Constructor(path, state.file, builtinClasses).run(),
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);
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if (path.isCallExpression()) {
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annotateAsPure(path);
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if (path.get("callee").isArrowFunctionExpression()) {
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path.get("callee").arrowFunctionToExpression();
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}
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}
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},
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},
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};
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});
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