86 lines
2.6 KiB
JavaScript
86 lines
2.6 KiB
JavaScript
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/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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*/
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'use strict';
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const syntaxFlow = require('@babel/plugin-syntax-flow').default;
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function memberInit(t, bodyType, member) {
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if (bodyType === 'EnumSymbolBody') {
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return t.callExpression(t.identifier('Symbol'), [
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t.stringLiteral(member.id.name),
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]);
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}
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return member.init;
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}
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module.exports = function transformEnums(babel) {
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const t = babel.types;
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return {
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name: 'transform-flow-enums',
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inherits: (api, options, dirname) =>
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syntaxFlow(api, {...options, enums: true}, dirname),
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visitor: {
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EnumDeclaration(path, state) {
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const opts = state.opts;
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const enumModule =
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opts.getRuntime != null
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? opts.getRuntime(t)
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: t.callExpression(t.identifier('require'), [
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t.stringLiteral('flow-enums-runtime'),
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]);
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const body = path.node.body;
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const members = body.members;
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const mirrored =
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body.type === 'EnumStringBody' &&
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(!members.length || members[0].type === 'EnumDefaultedMember');
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const enumExpression = mirrored
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? t.callExpression(
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t.memberExpression(enumModule, t.identifier('Mirrored')),
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[
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t.arrayExpression(
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members.map(member => t.stringLiteral(member.id.name)),
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),
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],
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)
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: t.callExpression(enumModule, [
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t.objectExpression(
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members.map(member => {
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return t.objectProperty(
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member.id,
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memberInit(t, body.type, member),
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);
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}),
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),
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]);
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const enumDeclaration = t.variableDeclaration('const', [
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t.variableDeclarator(path.node.id, enumExpression),
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]);
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// Default exports do not support variable declaration statements as
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// children, instead we need to replace the statement and append a
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// default export of the identifier. e.g.
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// export default enum A {} -> const A = ...; export default A;
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if (t.isExportDefaultDeclaration(path.parentPath)) {
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path.parentPath.replaceWithMultiple([
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enumDeclaration,
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t.exportDefaultDeclaration(t.identifier(path.node.id.name)),
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]);
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return;
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}
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path.replaceWith(enumDeclaration);
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},
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},
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};
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};
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