Function getSourceFile

test/fixtures/snapshot/typescript.js:115783–115798

(fileName, languageVersionOrOptions, onError)

        var getCanonicalFileName = ts.createGetCanonicalFileName(system.useCaseSensitiveFileNames);
        var computeHash = ts.maybeBind(system, system.createHash) || ts.generateDjb2Hash;
        function getSourceFile(fileName, languageVersionOrOptions, onError) {
            var text;
            try {
                ts.performance.mark("beforeIORead");
                text = compilerHost.readFile(fileName);
                ts.performance.mark("afterIORead");
                ts.performance.measure("I/O Read", "beforeIORead", "afterIORead");
            }
            catch (e) {
                if (onError) {
                    onError(e.message);
                }
                text = "";
            }
            return text !== undefined ? ts.createSourceFile(fileName, text, languageVersionOrOptions, setParentNodes) : undefined;
        }
        function directoryExists(directoryPath) {
            if (existingDirectories.has(directoryPath)) {
                return true;