71 lines
1.8 KiB
JavaScript
71 lines
1.8 KiB
JavaScript
import template from "babel-template";
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const buildWrapper = template(`
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let CLASS_REF = CLASS;
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var CALL_REF = CALL;
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var WRAPPER_REF = function (...args) {
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if (this instanceof WRAPPER_REF) {
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return Reflect.construct(CLASS_REF, args);
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} else {
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return CALL_REF.apply(this, args);
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}
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};
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WRAPPER_REF.__proto__ = CLASS_REF;
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WRAPPER_REF;
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`);
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export default function ({ types: t }) {
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const ALREADY_VISITED = Symbol();
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function findConstructorCall(path): ?Object {
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const methods: Array<Object> = path.get("body.body");
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for (const method of methods) {
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if (method.node.kind === "constructorCall") {
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return method;
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}
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}
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return null;
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}
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function handleClassWithCall(constructorCall, classPath) {
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const { node } = classPath;
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const ref = node.id || classPath.scope.generateUidIdentifier("class");
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if (classPath.parentPath.isExportDefaultDeclaration()) {
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classPath = classPath.parentPath;
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classPath.insertAfter(t.exportDefaultDeclaration(ref));
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}
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classPath.replaceWithMultiple(buildWrapper({
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CLASS_REF: classPath.scope.generateUidIdentifier(ref.name),
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CALL_REF: classPath.scope.generateUidIdentifier(`${ref.name}Call`),
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CALL: t.functionExpression(null, constructorCall.node.params, constructorCall.node.body),
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CLASS: t.toExpression(node),
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WRAPPER_REF: ref
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}));
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constructorCall.remove();
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}
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return {
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inherits: require("babel-plugin-syntax-class-constructor-call"),
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visitor: {
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Class(path) {
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if (path.node[ALREADY_VISITED]) return;
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path.node[ALREADY_VISITED] = true;
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const constructorCall = findConstructorCall(path);
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if (constructorCall) {
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handleClassWithCall(constructorCall, path);
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} else {
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return;
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}
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}
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}
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};
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}
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