src/config-utl/extract-ts-config.mjs
import { dirname, resolve } from "node:path";
import tryImport from "semver-try-require";
import meta from "#meta.cjs";
const typescript = await tryImport(
"typescript",
meta.supportedTranspilers.typescript,
);
const FORMAT_DIAGNOSTICS_HOST = {
getCanonicalFileName(pFileName) {
let lReturnValue = pFileName.toLowerCase();
// depends on the platform which branch is taken, hence the c8 ignore
/* c8 ignore start */
if (typescript?.sys?.useCaseSensitiveFileNames ?? false) {
lReturnValue = pFileName;
}
/* c8 ignore stop */
return lReturnValue;
},
getCurrentDirectory() {
return process.cwd();
},
getNewLine() {
return "\n";
},
};
/**
* Reads the file with name `pTSConfigFileName` and returns its parsed
* contents as an object
*
* Silently fails if a supported version of the typescript compiler isn't available
*
* @param {string} pTSConfigFileName
* @return {import("typescript").ParsedCommandLine} tsconfig as an object
* @throws {Error} when the tsconfig is invalid/ has errors
* @throws {TypeError} when the tsconfig is unreadable
*/
export default function extractTSConfig(pTSConfigFileName) {
let lReturnValue = {};
if (typescript) {
const lConfig = typescript.readConfigFile(
pTSConfigFileName,
typescript.sys.readFile,
);
if (typeof lConfig.error !== "undefined") {
throw new TypeError(
typescript.formatDiagnostics([lConfig.error], FORMAT_DIAGNOSTICS_HOST),
);
}
lReturnValue = typescript.parseJsonConfigFileContent(
lConfig.config,
typescript.sys,
dirname(resolve(pTSConfigFileName)),
{},
pTSConfigFileName,
);
if (lReturnValue.errors.length > 0) {
throw new Error(
typescript.formatDiagnostics(
lReturnValue.errors,
FORMAT_DIAGNOSTICS_HOST,
),
);
}
// lRetval.fileNames; // all files included in the project
// lRetval.options; // CompilerOptions
}
return lReturnValue;
}