53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
/**
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* Copyright 2013-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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'use strict';
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module.exports = function autoImporter(babel) {
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const t = babel.types;
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function getAssignIdent(path, file, state) {
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if (!state.id) {
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state.id = path.scope.generateUidIdentifier('assign');
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path.scope.getProgramParent().push({
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id: state.id,
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init: t.callExpression(
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t.identifier('require'),
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[t.stringLiteral('object-assign')]
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),
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});
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}
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return state.id;
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}
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return {
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pre: function() {
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// map from module to generated identifier
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this.id = null;
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},
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visitor: {
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CallExpression: function(path, file) {
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if (path.get('callee').matchesPattern('Object.assign')) {
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// generate identifier and require if it hasn't been already
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var id = getAssignIdent(path, file, this);
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path.node.callee = id;
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}
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},
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MemberExpression: function(path, file) {
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if (path.matchesPattern('Object.assign')) {
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var id = getAssignIdent(path, file, this);
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path.replaceWith(id);
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}
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},
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},
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};
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};
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