@expo/metro-config
Version:
A Metro config for running React Native projects with the Metro bundler
44 lines • 1.89 kB
JavaScript
;
/**
* Copyright 2024-present 650 Industries (Expo). All rights reserved.
* 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.
*
* https://github.com/facebook/metro/blob/96c6b893eb77b5929b6050d7189905232ddf6d6d/packages/metro-transform-worker/src/index.js#L679
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.countLinesAndTerminateMap = void 0;
function countLinesAndTerminateMap(code, map) {
const NEWLINE = /\r\n?|\n|\u2028|\u2029/g;
let lineCount = 1;
let lastLineStart = 0;
// Count lines and keep track of where the last line starts
for (const match of code.matchAll(NEWLINE)) {
if (match.index == null)
continue;
lineCount++;
lastLineStart = match.index + match[0].length;
}
const lastLineLength = code.length - lastLineStart;
const lastLineIndex1Based = lineCount;
const lastLineNextColumn0Based = lastLineLength;
// If there isn't a mapping at one-past-the-last column of the last line,
// add one that maps to nothing. This ensures out-of-bounds lookups hit the
// null mapping rather than aliasing to whichever mapping happens to be last.
// ASSUMPTION: Mappings are generated in order of increasing line and column.
const lastMapping = map[map.length - 1];
const terminatingMapping = [lastLineIndex1Based, lastLineNextColumn0Based];
if (!lastMapping ||
lastMapping[0] !== terminatingMapping[0] ||
lastMapping[1] !== terminatingMapping[1]) {
return {
lineCount,
map: map.concat([terminatingMapping]),
};
}
return { lineCount, map: [...map] };
}
exports.countLinesAndTerminateMap = countLinesAndTerminateMap;
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