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index.js
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index.js
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/*
** Copyright 2020 Bloomberg Finance L.P.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
import { declare } from "@babel/helper-plugin-utils";
import syntaxRecordAndTuple from "@babel/plugin-syntax-record-and-tuple";
import { types as t } from "@babel/core";
import { addNamed, isModule } from "@babel/helper-module-imports";
import { OptionValidator } from "@babel/helper-validator-option";
import { name as packageName } from "../package.json";
const v = new OptionValidator(packageName);
export default declare((api, options) => {
api.assertVersion(7);
const polyfillModuleName = v.validateStringOption(
"polyfillModuleName",
options.polyfillModuleName,
"@bloomberg/record-tuple-polyfill",
);
const shouldImportPolyfill = v.validateBooleanOption(
"importPolyfill",
options.importPolyfill,
!!options.polyfillModuleName,
);
// program -> cacheKey -> localBindingName
const importCaches = new WeakMap();
function getOr(map, key, getDefault) {
let value = map.get(key);
if (!value) map.set(key, (value = getDefault()));
return value;
}
function getBuiltIn(name, path, programPath) {
if (!shouldImportPolyfill) return t.identifier(name);
if (!programPath) {
throw new Error("Internal error: unable to find the Program node.");
}
const cacheKey = `${name}:${isModule(programPath)}`;
const cache = getOr(importCaches, programPath.node, () => new Map());
const localBindingName = getOr(cache, cacheKey, () => {
return addNamed(programPath, name, polyfillModuleName, {
importedInterop: "uncompiled",
}).name;
});
return t.identifier(localBindingName);
}
return {
name: "@bloomberg/babel-plugin-proposal-record-and-tuple",
inherits: syntaxRecordAndTuple,
visitor: {
Program(path, state) {
state.programPath = path;
},
RecordExpression(path, state) {
const record = getBuiltIn("Record", path, state.programPath);
const object = t.objectExpression(path.node.properties);
const wrapped = t.callExpression(record, [object]);
path.replaceWith(wrapped);
},
TupleExpression(path, state) {
const tuple = getBuiltIn("Tuple", path, state.programPath);
const wrapped = t.callExpression(tuple, path.node.elements);
path.replaceWith(wrapped);
},
},
};
});