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misc(jest-haste-map): simplified checking of the beginning of a pathname #15873

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misc(jest-haste-map): simplified checking of the beginning of a pathname #15873

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4 changes: 2 additions & 2 deletions packages/jest-haste-map/src/lib/fast_path.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ import * as path from 'path';

// rootDir and filename must be absolute paths (resolved)
export function relative(rootDir: string, filename: string): string {
return filename.indexOf(rootDir + path.sep) === 0
return filename.startsWith(rootDir + path.sep)
? filename.slice(rootDir.length + 1)
: path.relative(rootDir, filename);
}
Expand All @@ -19,7 +19,7 @@ const INDIRECTION_FRAGMENT = `..${path.sep}`;
// rootDir must be an absolute path and relativeFilename must be simple
// (e.g.: foo/bar or ../foo/bar, but never ./foo or foo/../bar)
export function resolve(rootDir: string, relativeFilename: string): string {
return relativeFilename.indexOf(INDIRECTION_FRAGMENT) === 0
return relativeFilename.startsWith(INDIRECTION_FRAGMENT)
? path.resolve(rootDir, relativeFilename)
: rootDir + path.sep + relativeFilename;
}
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