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fix: skip merging large input sourcemaps (#10890)

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This commit is contained in:
Huáng Jùnliàng
2019-12-18 19:16:20 -05:00
committed by Nicolò Ribaudo
parent 80e95d0c83
commit e85c9b9ec8
2 changed files with 13 additions and 8 deletions
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19
packages/babel-core/src/transformation/normalize-file.js
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@@ -13,6 +13,7 @@ import File from "./file/file";
import generateMissingPluginMessage from "./util/missing-plugin-helper";
const debug = buildDebug("babel:transform:file");
const LARGE_INPUT_SOURCEMAP_THRESHOLD = 1_000_000;
export type NormalizedFile = {
code: string,
@@ -65,14 +66,18 @@ export default function normalizeFile(
const lastComment = extractComments(EXTERNAL_SOURCEMAP_REGEX, ast);
if (typeof options.filename === "string" && lastComment) {
try {
const match = EXTERNAL_SOURCEMAP_REGEX.exec(lastComment);
if (!match) throw new Error("Invalid source map comment format.");
inputMap = convertSourceMap.fromJSON(
fs.readFileSync(
path.resolve(path.dirname(options.filename), match[1]),
"utf8",
),
// when `lastComment` is non-null, EXTERNAL_SOURCEMAP_REGEX must have matches
const match: [string, string] = (EXTERNAL_SOURCEMAP_REGEX.exec(
lastComment,
): any);
const inputMapContent: Buffer = fs.readFileSync(
path.resolve(path.dirname(options.filename), match[1]),
);
if (inputMapContent.length > LARGE_INPUT_SOURCEMAP_THRESHOLD) {
debug("skip merging input map > 1 MB");
} else {
inputMap = convertSourceMap.fromJSON(inputMapContent);
}
} catch (err) {
debug("discarding unknown file input sourcemap", err);
}