Function createWatchCompilerHost

test/fixtures/snapshot/typescript.js:123221–123232

* Creates the watch compiler host that can be extended with config file or root file names and options host

(system, createProgram, reportDiagnostic, reportWatchStatus)

     * Creates the watch compiler host that can be extended with config file or root file names and options host
     */
    function createWatchCompilerHost(system, createProgram, reportDiagnostic, reportWatchStatus) {
        if (system === void 0) { system = ts.sys; }
        var write = function (s) { return system.write(s + system.newLine); };
        var result = createProgramHost(system, createProgram);
        ts.copyProperties(result, createWatchHost(system, reportWatchStatus));
        result.afterProgramCreate = function (builderProgram) {
            var compilerOptions = builderProgram.getCompilerOptions();
            var newLine = ts.getNewLineCharacter(compilerOptions, function () { return system.newLine; });
            emitFilesAndReportErrors(builderProgram, reportDiagnostic, write, function (errorCount) { return result.onWatchStatusChange(ts.createCompilerDiagnostic(getWatchErrorSummaryDiagnosticMessage(errorCount), errorCount), newLine, compilerOptions, errorCount); });
        };
        return result;
    }
    /**
     * Report error and exit
     */