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/**
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* Copyright (c) Meta Platforms, Inc. and 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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'use strict';
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module.exports = function externalRuntime() {
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// When generating the source code for the Fizz runtime chunks we use global identifiers to refer
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// to different parts of the implementation. When generating the external runtime we need to
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// replace those with local identifiers instead.
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return {
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name: 'scripts/rollup/plugins/dynamic-imports',
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renderChunk(source) {
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// This replaces "window['$globalVar']" with "$globalVar".
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const variables = new Set();
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source = source.replace(
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/window\[['"](\$[A-z0-9_]*)['"]\]/g,
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(_, variableName) => {
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variables.add(variableName);
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return variableName;
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}
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);
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const startOfFn = 'use strict';
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let index = source.indexOf(startOfFn);
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if (index === -1) {
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return source;
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}
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index += startOfFn.length + 2;
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// Insert the declarations in the beginning of the function closure
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// to scope them to inside the runtime.
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let declarations = 'let ';
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variables.forEach(variable => {
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if (declarations !== 'let ') {
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declarations += ', ';
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}
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declarations += variable;
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});
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declarations += ';';
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source = source.slice(0, index) + declarations + source.slice(index);
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return source;
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},
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};
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};
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