flipper-babel-transformer/lib/get-cache-key.js

Babel transformer for Flipper plugins

"use strict";
/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 */
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * There are some env vars which affect transformations, so the Metro/Babel cache should be invalidated when at least one of them changed.
 *
 * If any issues found with such approach, we can fallback to the implementation which always invalidates caches, but also makes bundling significantly slower:
 * export default function getCacheKey() { return Math.random().toString(36); }
 */
const flipper_env_1 = __importDefault(require("./flipper-env"));
const fs_extra_1 = __importDefault(require("fs-extra"));
const path_1 = __importDefault(require("path"));
let selfChecksum;
function getSelfChecksum() {
    if (!selfChecksum) {
        selfChecksum = fs_extra_1.default
            .readFileSync(path_1.default.resolve(__dirname, '..', 'lib', 'checksum.txt'))
            .toString();
    }
    return selfChecksum;
}
function getCacheKey() {
    const key = [
        getSelfChecksum(),
        ...Object.entries(flipper_env_1.default)
            .sort(([name1, _value1], [name2, _value2]) => name1.localeCompare(name2))
            .map(([name, value]) => `${name}=${value}`),
    ].join('|');
    return key;
}
exports.default = getCacheKey;
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