Call-duration-measurer NPM

call-duration-measurer

call-duration-measurer is a utility for measuring the time it takes for function calls to complete. For functions that return promises, the time taken for the promise to complete is included in the recorded duration.

Installation

using npm:

npm install call-duration-measurer

using yarn:

yarn add call-duration-measurer

API

`CallDurationMeasurer`

The call-duration-measurer package exports the CallDurationMeasurer class:

import { CallDurationMeasurer } from 'call-duration-measurer';

const callDurationMeasurer = new CallDurationMeasurer();

The CallDurationMeasurer class provides a stateful way to measure and record the call durations of given functions. This is particularly useful when working with code that includes several function calls that you want to measure and keep track of.

How to import (recommended):

Root level named import using ES6 import (best for minimizing bundle size due to tree-shaking support):
```
import { CallDurationMeasurer } from 'call-duration-measurer';
```

Root level named import using CommonJS require:

const { CallDurationMeasurer } = require('call-duration-measurer');

Other ways to import (not recommended*):

Subfolder import from ES6 module using ES6 import:

import CallDurationMeasurer from 'call-duration-measurer/esm/CallDurationMeasurer';

Subfolder import from UMD module using ES6 import:

import CallDurationMeasurer from 'call-duration-measurer/CallDurationMeasurer';

Subfolder import using CommonJS require:
```
```
const CallDurationMeasurer = require('call-duration-measurer/CallDurationMeasurer').default;
```
```
* These import strategies are not recommended due to having either neglible or heavier impacts to bundle size for consuming applications in comparison to the recommended import strategies, coupled with having subjectively uglier import statements.

The CallDurationMeasurer class contains the following methods:

`invoke(func, [scope, ...args])`

Description

Warning: If you are executing this code in Internet Explorer, please consider using invokeWithOptions and specifying options.functionCallName instead. See the documentation including the note on use cases for invokeWithOptions below.

Arguments

func - The function to invoke.
scope - Optional. The value to use as this when calling func.
args - Optional. Arguments to call func with.

Return Value

If the result of func is a promise, returns a promise containing the resolved value of the promise returned by func. Otherwise, returns the result of func.

Example

class MessageBuilder {
  constructor(baseMessage) {
    this.baseMessage = baseMessage;
  }

  buildMessage(subMessage1, subMessage2) {
    return `${this.baseMessage} ${subMessage1} ${subMessage2}`;
  }
}

const messageBuilder = new MessageBuilder('Haru Okumura');

const message = callDurationMeasurer.invoke(messageBuilder.buildMessage, messageBuilder, 'is', 'rich');
// 'Haru Okumura is rich'

`measurify(func, [scope])`

Description

Returns a new function that, once invoked, invokes the given function func and records the time taken for the func call to complete. If func returns a promise, then the time taken for the promise to complete is included in the recorded duration. Any arguments that are passed to the function returned by this method will be used to call func with.

Note: This method is similar to invoke but has a key difference in that invoke calls func, whereas measurify returns a function which upon invocation calls func.
In some instances, using measurify rather than invoke makes your code appear slightly cleaner and more intuitive. Namely, the scenario arises when there is no meaningful value to pass in for the scope parameter but there are args to pass to func. See the following code snippet below as an example:

// Record the time taken to execute Math.round(1.9) using invoke:
const roundedNumberUsingInvoke = callDurationMeasurer.invoke(Math.round, null, 1.9);
// 2

// Record the time taken to execute Math.round(1.9) using measurify:
const roundedNumberUsingMeasurify = callDurationMeasurer.measurify(Math.round)(1.9);
// 2

Arguments

func - The function to invoke once the new function returned by this method is invoked.
scope - Optional. The value to use as this when calling func.

Return Value

Returns a new function that: 1) If the result of func is a promise, returns a promise containing the resolved value of the promise returned by func. 2) Otherwise, returns the result of func.

Example

const roundedNumber = callDurationMeasurer.measurify(Math.round)(1.9);
// 2

`getCallDurations()`

Description

Returns all call durations recorded by this CallDurationMeasurer.

Return Value

Returns an array containing all CallDurations recorded by this CallDurationMeasurer. If no CallDurations are recorded, returns an empty array.

The following describes the properties of a CallDuration object:

Property	Description	Type
name	The name referring to the function call.	string
duration	The time in milliseconds that it took for the call to complete.	number

Example

const roundedNumber = callDurationMeasurer.measurify(Math.round)(1.9);
// 2

const callDurations = callDurationMeasurer.getCallDurations();
/*
  [
    { name: 'round', duration: 1 },
  ]
 */

const foo = () => console.log('foo');

callDurationMeasurer.invoke(foo);

const updatedCallDurations = callDurationMeasurer.getCallDurations();
/*
  [
    { name: 'round', duration: 1 },
    { name: 'foo', duration: 1 },
  ]
 */

`clearCallDurations()`

Description

Removes all call durations recorded by this CallDurationMeasurer.

Return Value

Returns an array containing all CallDurations that were removed from this CallDurationMeasurer. See Return Value documentation for getCallDurations for details on the properties of a CallDuration object.

Example

const roundedNumber = callDurationMeasurer.measurify(Math.round)(1.9);
// 2

const removedCallDurations = callDurationMeasurer.clearCallDurations();
/*
  [
    { name: 'round', duration: 1 },
  ]
 */

const updatedCallDurations = callDurationMeasurer.getCallDurations();
// []

`invokeWithOptions(func, [options])`

Description

Invokes the given function func and records the time taken for the call to complete. If func returns a promise, then the time taken for the promise to complete is included in the recorded duration. This method is similar to invoke, but this method offers greater configurability through the options object.

Arguments

func - The function to invoke.
options - Optional. Options used to configure how func is called and/or recorded.

The following describes the properties of an options object:

Property	Description	Type
functionCallName	Optional. Custom `name` that is used when recording the `CallDuration` for `func`. When unspecified, `func.name` is used.	string
scope	Optional. The value to use as `this` when calling `func`.	object
args	Optional. Arguments to call `func` with.	array

Return Value

If the result of func is a promise, returns a promise containing the resolved value of the promise returned by func. Otherwise, returns the result of func.

Example

class MessageBuilder {
  constructor(baseMessage) {
    this.baseMessage = baseMessage;
  }

  buildMessage(subMessage1, subMessage2) {
    return `${this.baseMessage} ${subMessage1} ${subMessage2}`;
  }
}

const messageBuilder = new MessageBuilder('Ann Takamaki');

const message = callDurationMeasurer.invokeWithOptions(messageBuilder.buildMessage, {
  functionCallName: 'messageBuilder.buildMessage',
  scope: messageBuilder,
  args: ['likes', 'sweets'],
});
// 'Ann Takamaki likes sweets'

const callDurations = callDurationMeasurer.getCallDurations();
/*
  [
    { name: 'messageBuilder.buildMessage', duration: 1 },
  ]
 */

Note: Specifying options.functionCallName is helpful whenever you want the recorded name to be different than what func.name equals. Use cases include:

Minifying source code, causing function names to change. For example, source code such as:

function someFunctionWithALengthyName() {
  console.log('blah');
}

callDurationMeasurer.invoke(someFunctionWithALengthyName);

const callDurations = callDurationMeasurer.getCallDurations();
// [{ name: 'someFunctionWithALengthyName', duration: 1 }]

could get compressed to:

function f() {
  console.log('blah');
}
callDurationMeasurer.invoke(f);
var callDurations = callDurationMeasurer.getCallDurations();
// [{ name: 'f', duration: 1 }]

In the uncompressed version, the result of callDurationMeasurer.getCallDurations() is:

[{ name: 'someFunctionWithALengthyName', duration: 1 }]

but the result in the compressed version is:

[{ name: 'f', duration: 1 }]

Using invokeWithOptions and explicitly specifying options.functionCallName guarantees that the name you want will be returned, regardless of minification:

function f() {
  console.log('blah');
}
callDurationMeasurer.invokeWithOptions(f, { functionCallName: 'someFunctionWithALengthyName' });
var callDurations = callDurationMeasurer.getCallDurations();
// [{ name: 'someFunctionWithALengthyName', duration: 1 }]

Invoking namespaced functions or methods on objects. Consider the following code snippet for example:

class MessageBuilder {
  constructor(baseMessage) {
    this.baseMessage = baseMessage;
  }

  buildMessage(subMessage1, subMessage2) {
    return `${this.baseMessage} ${subMessage1} ${subMessage2}`;
  }
}

const messageBuilder = new MessageBuilder('Makoto Niijima');

const message = callDurationMeasurer.invoke(messageBuilder.buildMessage, messageBuilder, 'is', 'best girl');

const callDurations = callDurationMeasurer.getCallDurations();
/*
  [
    { name: 'buildMessage', duration: 1 },
  ]
 */

As we can see above, the result of callDurationMeasurer.getCallDurations() lacks the specificity that buildMessage was called on the messageBuilder object. We can easily include such specificity by using invokeWithOptions and specifying options.functionCallName:

const messageBuilder = new MessageBuilder('Makoto Niijima');

const message = callDurationMeasurer.invokeWithOptions(messageBuilder.buildMessage, {
  functionCallName: 'messageBuilder.buildMessage',
  scope: messageBuilder,
  args: ['is', 'best girl'],
});

const callDurations = callDurationMeasurer.getCallDurations();
/*
  [
    { name: 'messageBuilder.buildMessage', duration: 1 },
  ]
 */

Invoking multiple functions with the same name. Consider the following code snippet for example:

const { round } = require('lodash');

// Round 1.9 to the nearest integer using Math.round()
const roundedNumber = callDurationMeasurer.measurify(Math.round)(1.9);

// Round 1.9 to the nearest integer using round() from lodash
const anotherRoundedNumber = callDurationMeasurer.measurify(round)(1.9);

const callDurations = callDurationMeasurer.getCallDurations();
/*
  [
    { name: 'round', duration: 1 },
    { name: 'round', duration: 2 },
  ]
 */

callDurationMeasurer.getCallDurations() above returns two CallDuration objects, both with the same name. To distinguish between the calls to Math.round and round from lodash, we can use invokeWithOptions with different values for options.functionCallName:

const { round } = require('lodash');

// Round 1.9 to the nearest integer using Math.round()
const roundedNumber = callDurationMeasurer.invokeWithOptions(Math.round, {
  functionCallName: 'Math.round',
  args: [1.9],
});

// Round 1.9 to the nearest integer using round() from lodash
const anotherRoundedNumber = callDurationMeasurer.invokeWithOptions(round, {
  functionCallName: 'lodashRound',
  args: [1.9],
});

const callDurations = callDurationMeasurer.getCallDurations();
/*
  [
    { name: 'Math.round', duration: 1 },
    { name: 'lodashRound', duration: 2 },
  ]
 */

Invoking the same function multiple times. Consider the following code snippet for example:

const data = await callDurationMeasurer.measurify(fetch)('http://persona-waifus.com/makoto');

const moreData = await callDurationMeasurer.measurify(fetch)('http://persona-waifus.com/haru');

const callDurations = callDurationMeasurer.getCallDurations();
/*
  [
    { name: 'fetch', duration: 200 },
    { name: 'fetch', duration: 300 },
  ]
 */

callDurationMeasurer.getCallDurations() above returns two CallDuration objects, both with the same name. To distinguish between the different calls to fetch, we can use invokeWithOptions with different values for options.functionCallName:

const data = await callDurationMeasurer.invokeWithOptions(fetch, {
  functionCallName: 'fetchMakoto',
  args: ['http://persona-waifus.com/makoto'],
});

const moreData = await callDurationMeasurer.invokeWithOptions(fetch, {
  functionCallName: 'fetchHaru',
  args: ['http://persona-waifus.com/haru'],
});

const callDurations = callDurationMeasurer.getCallDurations();
/*
  [
    { name: 'fetchMakoto', duration: 200 },
    { name: 'fetchHaru', duration: 300 },
  ]
 */

Running code in Internet Explorer. Unfortunately, the invoke and measurify methods do not work well in Internet Explorer, due to the name property of functions being unsupported:

const foo = () => {};

callDurationMeasurer.invoke(foo);

callDurationMeasurer.measurify(Math.round)(1.9);

const callDurations = callDurationMeasurer.getCallDurations();
/*
  [
    { name: undefined, duration: 1 },
    { name: undefined, duration: 1 },
  ]
 */

Using invokeWithOptions and specifying options.functionCallName will solve this problem:

const foo = () => {};

callDurationMeasurer.invokeWithOptions(foo, {
  functionCallName: 'foo',
});

callDurationMeasurer.invokeWithOptions(Math.round, {
  functionCallName: 'Math.round',
  args: [1.9],
});

const callDurations = callDurationMeasurer.getCallDurations();
/*
  [
    { name: 'foo', duration: 1 },
    { name: 'Math.round', duration: 1 },
  ]
 */

Inline Measuring

The call-duration-measurer package also exports multiple standalone measuring functions that return/resolve measured durations:

import { invoke, measurify, invokeWithOptions } from 'call-duration-measurer';

Whereas the CallDurationMeasurer class is helpful for keeping a history of call durations, these inline measuring functions are useful for stateless one-off call duration measurements.

How to import (recommended):

Root level named imports using ES6 import (best for minimizing bundle size due to tree-shaking support):
```
import { invoke, measurify, invokeWithOptions } from 'call-duration-measurer';
```

Root level named imports using CommonJS require:

const { invoke, measurify, invokeWithOptions } = require('call-duration-measurer');

Other ways to import (not recommended*):

Subfolder named imports from ES6 module using ES6 import:

import { invoke, measurify, invokeWithOptions } from 'call-duration-measurer/esm/inlineMeasurer';

Subfolder named imports from UMD module using ES6 import:

import { invoke, measurify, invokeWithOptions } from 'call-duration-measurer/inlineMeasurer';

Subfolder named imports using CommonJS require:

const { invoke, measurify, invokeWithOptions } = require('call-duration-measurer/inlineMeasurer');

Subfolder single object import containing all functions from ES6 module using ES6 import:

import * as inlineMeasurer from 'call-duration-measurer/esm/inlineMeasurer';
// inlineMeasurer.invoke(...)
// inlineMeasurer.measurify(...)
// inlineMeasurer.invokeWithOptions(...)

Subfolder single object import containing all functions from UMD module using ES6 import:

import * as inlineMeasurer from 'call-duration-measurer/inlineMeasurer';
// inlineMeasurer.invoke(...)
// inlineMeasurer.measurify(...)
// inlineMeasurer.invokeWithOptions(...)

Subfolder single object import containing all functions using CommonJS require:
```
```
const inlineMeasurer = require('call-duration-measurer/inlineMeasurer');
// inlineMeasurer.invoke(...)
// inlineMeasurer.measurify(...)
// inlineMeasurer.invokeWithOptions(...)
```
```
* These import strategies are not recommended due to having either neglible or heavier impacts to bundle size for consuming applications in comparison to the recommended import strategies, coupled with having subjectively uglier import statements.

This package supports the following inline measuring functions:

`invoke(func, [scope, ...args])`

Description

Arguments

func - The function to invoke.
scope - Optional. The value to use as this when calling func.
args - Optional. Arguments to call func with.

Return Value

If the result of func is a promise, returns a promise containing a MeasurementResult. Otherwise, returns a MeasurementResult.

The following describes the properties of a MeasurementResult object:

Property	Description	Type
data	If `func` returns a promise: the resolved value of the promise returned by `func`.Otherwise: the result of `func`.	any
duration	The time in milliseconds that it took for the call to complete.	number

Example

class MessageBuilder {
  constructor(baseMessage) {
    this.baseMessage = baseMessage;
  }

  buildMessage(subMessage1, subMessage2) {
    return `${this.baseMessage} ${subMessage1} ${subMessage2}`;
  }
}

const messageBuilder = new MessageBuilder('Haru Okumura');

const { data, duration } = invoke(messageBuilder.buildMessage, messageBuilder, 'is', 'rich');
// { data: 'Haru Okumura is rich', duration: 1 }

`measurify(func, [scope])`

Description

Returns a new function that, once invoked, invokes the given function func and measures the time taken for the func call to complete. If func returns a promise, then the time taken for the promise to complete is included in the measured duration. Any arguments that are passed to the function returned by this method will be used to call func with.

Note: This function is similar to invoke but has a key difference in that invoke calls func, whereas measurify returns a function which upon invocation calls func.
In some instances, using measurify rather than invoke makes your code appear slightly cleaner and more intuitive. Namely, the scenario arises when there is no meaningful value to pass in for the scope parameter but there are args to pass to func. See the following code snippet below as an example:

// Measure the time taken to execute Math.round(1.9) using invoke:
const measurementResultUsingInvoke = invoke(Math.round, null, 1.9);
// { data: 2, duration: 1 }

// Measure the time taken to execute Math.round(1.9) using measurify:
const measurementResultUsingMeasurify = measurify(Math.round)(1.9);
// { data: 2, duration: 1 }

Arguments

func - The function to invoke once the new function returned by this method is invoked.
scope - Optional. The value to use as this when calling func.

Return Value

Returns a new function that: 1) If the result of func is a promise, returns a promise containing a MeasurementResult. 2) Otherwise, returns a MeasurementResult.

See Return Value documentation for invoke for details on the properties of a MeasurementResult object.

Example

const { data, duration } = measurify(Math.round)(1.9);
// { data: 2, duration: 1 }

`invokeWithOptions(func, [options])`

Description

Invokes the given function func and measures the time taken for the call to complete. If func returns a promise, then the time taken for the promise to complete is included in the measured duration. This function behaves the same as invoke and only differs in function signature:

invoke takes in func, scope, and args as separate arguments
invokeWithOptions takes in func and options, and options contains properties for scope and args

Arguments

func - The function to invoke.
options - Optional. Options used to configure how func is called.

The following describes the properties of an options object:

Property	Description	Type
scope	Optional. The value to use as `this` when calling `func`.	object
args	Optional. Arguments to call `func` with.	array

Return Value

If the result of func is a promise, returns a promise containing a MeasurementResult. Otherwise, returns a MeasurementResult.

See Return Value documentation for invoke for details on the properties of a MeasurementResult object.

Example

class MessageBuilder {
  constructor(baseMessage) {
    this.baseMessage = baseMessage;
  }

  buildMessage(subMessage1, subMessage2) {
    return `${this.baseMessage} ${subMessage1} ${subMessage2}`;
  }
}

const messageBuilder = new MessageBuilder('Ann Takamaki');

const { data, duration } = invokeWithOptions(messageBuilder.buildMessage, {
  scope: messageBuilder,
  args: ['likes', 'sweets'],
});
// { data: 'Ann Takamaki likes sweets', duration: 1 }

Example Usage

Stateful call duration measuring:

import { CallDurationMeasurer } from 'call-duration-measurer';

const someFunctionThatReturnsAPromise = () => {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve('Resolved value!');
    }, 1000)
  });
};

const greet = name => {
  return `Hi, ${name}`;
};

class MessageBuilder {
  constructor(baseMessage) {
    this.baseMessage = baseMessage;
  }

  buildMessage(subMessage1, subMessage2) {
    return `${this.baseMessage} ${subMessage1} ${subMessage2}`;
  }
}

const main = async () => {
  // Create a new `CallDurationMeasurer`.
  const callDurationMeasurer = new CallDurationMeasurer();

  // Invoke `someFunctionThatReturnsAPromise` and record the time taken for this call INCLUDING the time taken for the promise to complete.
  const result1 = await callDurationMeasurer.invoke(someFunctionThatReturnsAPromise);
  console.log(result1);
  // 'Resolved Value!'

  const messageBuilder = new MessageBuilder('Makoto is');
  // Invoke the `buildMessage` method on `messageBuilder` with 'best' and 'girl' as arguments, and record the time taken for this call to complete.
  const result2 = callDurationMeasurer.invoke(messageBuilder.buildMessage, messageBuilder, 'best', 'girl');
  console.log(result2);
  // 'Makoto is best girl'

  // Invoke `greet`, passing in 'Ann' as an argument, and record the time taken for this call to complete. The value of `this` is irrelevant for this function, so `null` is passed in as the `scope` argument.
  const result3 = callDurationMeasurer.invoke(greet, null, 'Ann');
  console.log(result3);
  // 'Hi, Ann'

  // Invoke `greet`, passing in 'Kasumi' as an argument, and record the time taken for this call to complete. The `measurify` method (and the function returned by it) is used here as an alternative to the `invoke` method.
  const result4 = callDurationMeasurer.measurify(greet)('Kasumi');
  console.log(result4);
  // 'Hi, Kasumi'

  // Invoke the `buildMessage` method on `messageBuilder` with 'top' and 'tier' as arguments, and record the time taken for this call to complete. The `invokeWithOptions` method is used here to provide a custom name used in recording this function call.
  const result5 = callDurationMeasurer.invokeWithOptions(messageBuilder.buildMessage, {
    functionCallName: 'buildTopTierMessage',
    scope: messageBuilder,
    args: ['top', 'tier'],
  });
  console.log(result5);
  // 'Makoto is top tier'

  // Retrieve recorded call durations.
  const callDurations = callDurationMeasurer.getCallDurations();

  console.log(callDurations);
  /*
    [
      { name: 'someFunctionThatReturnsAPromise', duration: 1002 },
      { name: 'buildMessage', duration: 2 },
      { name: 'greet', duration: 1 },
      { name: 'greet', duration: 1 },
      { name: 'buildTopTierMessage', duration: 2 },
    ]
   */

  // Remove all recorded call durations.
  callDurationMeasurer.clearCallDurations();

  const updatedCallDurations = callDurationMeasurer.getCallDurations();

  console.log(updatedCallDurations);
  // []

  const result6 = callDurationMeasurer.measurify(greet)('Futaba');
  console.log(result6);
  // 'Hi, Futaba'

  // An array containing only the call duration for the most recent call to `greet` above is returned due to executing `clearCallDurations()` beforehand.
  const updatedCallDurations2 = callDurationMeasurer.getCallDurations();

  console.log(updatedCallDurations2);
  /*
    [
      { name: 'greet', duration: 1 },
    ]
   */
};

main();

Stateless call duration measuring:

import { invoke, measurify, invokeWithOptions } from 'call-duration-measurer';

const someFunctionThatReturnsAPromise = () => {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve('Resolved value!');
    }, 1000)
  });
};

const greet = name => {
  return `Hi, ${name}`;
};

class MessageBuilder {
  constructor(baseMessage) {
    this.baseMessage = baseMessage;
  }

  buildMessage(subMessage1, subMessage2) {
    return `${this.baseMessage} ${subMessage1} ${subMessage2}`;
  }
}

const main = async () => {
  // Invoke `someFunctionThatReturnsAPromise` and measure the time taken for this call INCLUDING the time taken for the promise to complete.
  const measurementResult1 = await invoke(someFunctionThatReturnsAPromise);
  console.log(measurementResult1);
  // { data: 'Resolved value!', duration: 1002 }

  const messageBuilder = new MessageBuilder('Makoto is');

  // Invoke the `buildMessage` method on `messageBuilder` with 'best' and 'girl' as arguments, and measure the time taken for this call to complete.
  const measurementResult2 = invoke(messageBuilder.buildMessage, messageBuilder, 'best', 'girl');
  console.log(measurementResult2);
  // { data: 'Makoto is best girl', duration: 2 }

  // Invoke the `buildMessage` method on `messageBuilder` with 'top' and 'tier' as arguments, and measure the time taken for this call to complete. The `invokeWithOptions` function is used here as an alternative to the `invoke` function.
  const measurementResult3 = invokeWithOptions(messageBuilder.buildMessage, {
    scope: messageBuilder,
    args: ['top', 'tier'],
  });
  console.log(measurementResult3);
  // { data: 'Makoto is top tier', duration: 2 }

  // Invoke `greet`, passing in 'Haru' as an argument, and measure the time taken for this call to complete. The value of `this` is irrelevant for this function, so `null` is passed in as the `scope` argument.
  const measurementResult4 = invoke(greet, null, 'Haru');
  console.log(measurementResult4);
  // { data: 'Hi, Haru', duration: 1 }

  // Invoke `greet`, passing in 'Sumire' as an argument, and measure the time taken for this call to complete. The `measurify` function (and the function returned by it) is used here as an alternative to the `invoke` function.
  const measurementResult5 = measurify(greet)('Sumire');
  console.log(measurementResult5);
  // { data: 'Hi, Sumire', duration: 1 }
};

main();

Migrating from v1 to v2

If you are upgrading call-duration-measurer from v1 to v2, the only breaking change is to update your import statements for importing the CallDurationMeasurer class:

call-duration-measurer v1

ES6

import CallDurationMeasurer from 'call-duration-measurer;

CommonJS

const CallDurationMeasurer = require('call-duration-measurer);

call-duration-measurer v2

ES6

import { CallDurationMeasurer } from 'call-duration-measurer;

CommonJS

const { CallDurationMeasurer } = require('call-duration-measurer);

Please see the API documentation above for more details on importing the CallDurationMeasurer class.

call duration measurer measure function promise execution time timer performance

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