Function createConfigFileUpdater

src/cli/tsconfig.ts:131–148

(
    optionsToExtend: CompilerOptions
)

}

export function createConfigFileUpdater(
    optionsToExtend: CompilerOptions
): (options: ts.CompilerOptions) => ts.Diagnostic[] {
    const configFileMap = new WeakMap<ts.TsConfigSourceFile, ts.ParsedCommandLine>();
    return options => {
        const { configFile, configFilePath } = options;
        if (!configFile || !configFilePath) return [];

        if (!configFileMap.has(configFile)) {
            const parsedConfigFile = parseConfigFileWithSystem(configFilePath, optionsToExtend, ts.sys);
            configFileMap.set(configFile, parsedConfigFile);
        }

        const parsedConfigFile = configFileMap.get(configFile)!;
        Object.assign(options, parsedConfigFile.options);
        return parsedConfigFile.errors;
    };
}