30 lines
1.1 KiB
TypeScript
30 lines
1.1 KiB
TypeScript
/** Emitted NodeNext suffixes and the TypeScript source counterparts they name. */
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const EMITTED_SUFFIXES: ReadonlyArray<
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readonly [suffix: string, sourceSuffixes: readonly string[]]
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> = [
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[".js", [".ts", ".tsx", ".d.ts"]],
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[".mjs", [".mts", ".d.mts"]],
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[".cjs", [".cts", ".d.cts"]],
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[".jsx", [".tsx", ".d.ts"]],
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];
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/**
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* Return TypeScript source counterparts for an explicit emitted filename.
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* Callers retain exact runtime-file precedence and must not use these for
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* directory/index, URL, HTML, or package target resolution.
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*/
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export const typescriptEmittedSourceCandidates = (
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sourcePath: string,
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candidate: string,
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): readonly string[] => {
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if (!/\.(?:ts|tsx|mts|cts)$/u.test(sourcePath)) return [];
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const emitted = EMITTED_SUFFIXES.find(([suffix]) =>
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candidate.endsWith(suffix),
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);
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if (emitted === undefined) return [];
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// Strip the matched suffix by length. posix.extname would miss dotfile
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// names such as ".js", whose whole basename is the emitted suffix itself.
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const stem = candidate.slice(0, candidate.length - emitted[0].length);
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return emitted[1].map((suffix) => `${stem}${suffix}`);
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};
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