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perfLogger.ts

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/* @internal */

namespace ts {

type PerfLogger = typeof import("@microsoft/typescript-etw");

const nullLogger: PerfLogger = {

logEvent: noop,

logErrEvent: noop,

logPerfEvent: noop,

logInfoEvent: noop,

logStartCommand: noop,

logStopCommand: noop,

logStartUpdateProgram: noop,

logStopUpdateProgram: noop,

logStartUpdateGraph: noop,

logStopUpdateGraph: noop,

logStartResolveModule: noop,

logStopResolveModule: noop,

logStartParseSourceFile: noop,

logStopParseSourceFile: noop,

logStartReadFile: noop,

logStopReadFile: noop,

logStartBindFile: noop,

logStopBindFile: noop,

logStartScheduledOperation: noop,

logStopScheduledOperation: noop,

};

// Load optional module to enable Event Tracing for Windows

// See https://github.com/microsoft/typescript-etw for more information

let etwModule;

try {

const etwModulePath = process.env.TS_ETW_MODULE_PATH ?? "./node_modules/@microsoft/typescript-etw";

// require() will throw an exception if the module is not found

// It may also return undefined if not installed properly

etwModule = require(etwModulePath);

}

catch (e) {

etwModule = undefined;

}

/** Performance logger that will generate ETW events if possible - check for `logEvent` member, as `etwModule` will be `{}` when browserified */

export const perfLogger: PerfLogger = etwModule && etwModule.logEvent ? etwModule : nullLogger;

}