aws-cdk
Version:
AWS CDK CLI, the command line tool for CDK apps
360 lines • 48.1 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.CliIoHost = void 0;
exports.isCI = isCI;
const util = require("node:util");
const cloud_assembly_schema_1 = require("@aws-cdk/cloud-assembly-schema");
const toolkit_lib_1 = require("@aws-cdk/toolkit-lib");
const chalk = require("chalk");
const promptly = require("promptly");
const api_private_1 = require("../../../lib/api-private");
const deploy_1 = require("../../commands/deploy");
/**
* A simple IO host for the CLI that writes messages to the console.
*/
class CliIoHost {
/**
* Returns the singleton instance
*/
static instance(props = {}, forceNew = false) {
if (forceNew || !CliIoHost._instance) {
CliIoHost._instance = new CliIoHost(props);
}
return CliIoHost._instance;
}
constructor(props = {}) {
/**
* Configure the target stream for notices
*
* (Not a setter because there's no need for additional logic when this value
* is changed yet)
*/
this.noticesDestination = 'stderr';
this._progress = deploy_1.StackActivityProgress.BAR;
// Corked Logging
this.corkedCounter = 0;
this.corkedLoggingBuffer = [];
this.currentAction = props.currentAction ?? 'none';
this.isTTY = props.isTTY ?? process.stdout.isTTY ?? false;
this.logLevel = props.logLevel ?? 'info';
this.isCI = props.isCI ?? isCI();
this.requireDeployApproval = props.requireDeployApproval ?? cloud_assembly_schema_1.RequireApproval.BROADENING;
this.stackProgress = props.stackProgress ?? deploy_1.StackActivityProgress.BAR;
}
/**
* Returns the singleton instance
*/
registerIoHost(ioHost) {
if (ioHost !== this) {
this._internalIoHost = ioHost;
}
}
/**
* Update the stackProgress preference.
*/
set stackProgress(type) {
this._progress = type;
}
/**
* Gets the stackProgress value.
*
* This takes into account other state of the ioHost,
* like if isTTY and isCI.
*/
get stackProgress() {
// We can always use EVENTS
if (this._progress === deploy_1.StackActivityProgress.EVENTS) {
return this._progress;
}
// if a debug message (and thus any more verbose messages) are relevant to the current log level, we have verbose logging
const verboseLogging = (0, api_private_1.isMessageRelevantForLevel)({ level: 'debug' }, this.logLevel);
if (verboseLogging) {
return deploy_1.StackActivityProgress.EVENTS;
}
// On Windows we cannot use fancy output
const isWindows = process.platform === 'win32';
if (isWindows) {
return deploy_1.StackActivityProgress.EVENTS;
}
// On some CI systems (such as CircleCI) output still reports as a TTY so we also
// need an individual check for whether we're running on CI.
// see: https://discuss.circleci.com/t/circleci-terminal-is-a-tty-but-term-is-not-set/9965
const fancyOutputAvailable = this.isTTY && !this.isCI;
if (!fancyOutputAvailable) {
return deploy_1.StackActivityProgress.EVENTS;
}
// Use the user preference
return this._progress;
}
get defaults() {
return this.asIoHelper().defaults;
}
asIoHelper() {
return (0, api_private_1.asIoHelper)(this, this.currentAction);
}
/**
* Executes a block of code with corked logging. All log messages during execution
* are buffered and only written when all nested cork blocks complete (when CORK_COUNTER reaches 0).
* The corking is bound to the specific instance of the CliIoHost.
*
* @param block - Async function to execute with corked logging
* @returns Promise that resolves with the block's return value
*/
async withCorkedLogging(block) {
this.corkedCounter++;
try {
return await block();
}
finally {
this.corkedCounter--;
if (this.corkedCounter === 0) {
// Process each buffered message through notify
for (const ioMessage of this.corkedLoggingBuffer) {
await this.notify(ioMessage);
}
// remove all buffered messages in-place
this.corkedLoggingBuffer.splice(0);
}
}
}
/**
* Notifies the host of a message.
* The caller waits until the notification completes.
*/
async notify(msg) {
if (this._internalIoHost) {
return this._internalIoHost.notify(msg);
}
if (this.isStackActivity(msg)) {
if (!this.activityPrinter) {
this.activityPrinter = this.makeActivityPrinter();
}
await this.activityPrinter.notify(msg);
return;
}
if (!(0, api_private_1.isMessageRelevantForLevel)(msg, this.logLevel)) {
return;
}
if (this.corkedCounter > 0) {
this.corkedLoggingBuffer.push(msg);
return;
}
const output = this.formatMessage(msg);
const stream = this.selectStream(msg);
stream?.write(output);
}
/**
* Detect stack activity messages so they can be send to the printer.
*/
isStackActivity(msg) {
return msg.code && [
'CDK_TOOLKIT_I5501',
'CDK_TOOLKIT_I5502',
'CDK_TOOLKIT_I5503',
].includes(msg.code);
}
/**
* Detect special messages encode information about whether or not
* they require approval
*/
skipApprovalStep(msg) {
const approvalToolkitCodes = ['CDK_TOOLKIT_I5060'];
if (!(msg.code && approvalToolkitCodes.includes(msg.code))) {
false;
}
switch (this.requireDeployApproval) {
// Never require approval
case cloud_assembly_schema_1.RequireApproval.NEVER:
return true;
// Always require approval
case cloud_assembly_schema_1.RequireApproval.ANYCHANGE:
return false;
// Require approval if changes include broadening permissions
case cloud_assembly_schema_1.RequireApproval.BROADENING:
return ['none', 'non-broadening'].includes(msg.data?.permissionChangeType);
}
}
/**
* Determines the output stream, based on message and configuration.
*/
selectStream(msg) {
if (isNoticesMessage(msg)) {
return targetStreamObject(this.noticesDestination);
}
return this.selectStreamFromLevel(msg.level);
}
/**
* Determines the output stream, based on message level and configuration.
*/
selectStreamFromLevel(level) {
// The stream selection policy for the CLI is the following:
//
// (1) Messages of level `result` always go to `stdout`
// (2) Messages of level `error` always go to `stderr`.
// (3a) All remaining messages go to `stderr`.
// (3b) If we are in CI mode, all remaining messages go to `stdout`.
//
switch (level) {
case 'error':
return process.stderr;
case 'result':
return process.stdout;
default:
return this.isCI ? process.stdout : process.stderr;
}
}
/**
* Notifies the host of a message that requires a response.
*
* If the host does not return a response the suggested
* default response from the input message will be used.
*/
async requestResponse(msg) {
// First call out to a registered instance if we have one
if (this._internalIoHost) {
return this._internalIoHost.requestResponse(msg);
}
// If the request cannot be prompted for by the CliIoHost, we just accept the default
if (!isPromptableRequest(msg)) {
await this.notify(msg);
return msg.defaultResponse;
}
const response = await this.withCorkedLogging(async () => {
// prepare prompt data
// @todo this format is not defined anywhere, probably should be
const data = msg.data ?? {};
const motivation = data.motivation ?? 'User input is needed';
const concurrency = data.concurrency ?? 0;
const responseDescription = data.responseDescription;
// only talk to user if STDIN is a terminal (otherwise, fail)
if (!this.isTTY) {
throw new toolkit_lib_1.ToolkitError(`${motivation}, but terminal (TTY) is not attached so we are unable to get a confirmation from the user`);
}
// only talk to user if concurrency is 1 (otherwise, fail)
if (concurrency > 1) {
throw new toolkit_lib_1.ToolkitError(`${motivation}, but concurrency is greater than 1 so we are unable to get a confirmation from the user`);
}
// Special approval prompt
// Determine if the message needs approval. If it does, continue (it is a basic confirmation prompt)
// If it does not, return success (true). We only check messages with codes that we are aware
// are requires approval codes.
if (this.skipApprovalStep(msg)) {
return true;
}
// Basic confirmation prompt
// We treat all requests with a boolean response as confirmation prompts
if (isConfirmationPrompt(msg)) {
const confirmed = await promptly.confirm(`${chalk.cyan(msg.message)} (y/n)`);
if (!confirmed) {
throw new toolkit_lib_1.ToolkitError('Aborted by user');
}
return confirmed;
}
// Asking for a specific value
const prompt = extractPromptInfo(msg);
const desc = responseDescription ?? prompt.default;
const answer = await promptly.prompt(`${chalk.cyan(msg.message)}${desc ? ` (${desc})` : ''}`, {
default: prompt.default,
trim: true,
});
return prompt.convertAnswer(answer);
});
// We need to cast this because it is impossible to narrow the generic type
// isPromptableRequest ensures that the response type is one we can prompt for
// the remaining code ensure we are indeed returning the correct type
return response;
}
/**
* Formats a message for console output with optional color support
*/
formatMessage(msg) {
// apply provided style or a default style if we're in TTY mode
let message_text = this.isTTY
? styleMap[msg.level](msg.message)
: msg.message;
// prepend timestamp if IoMessageLevel is DEBUG or TRACE. Postpend a newline.
return ((msg.level === 'debug' || msg.level === 'trace')
? `[${this.formatTime(msg.time)}] ${message_text}`
: message_text) + '\n';
}
/**
* Formats date to HH:MM:SS
*/
formatTime(d) {
const pad = (n) => n.toString().padStart(2, '0');
return `${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}`;
}
/**
* Get an instance of the ActivityPrinter
*/
makeActivityPrinter() {
const props = {
stream: this.selectStreamFromLevel('info'),
};
switch (this.stackProgress) {
case deploy_1.StackActivityProgress.EVENTS:
return new api_private_1.HistoryActivityPrinter(props);
case deploy_1.StackActivityProgress.BAR:
return new api_private_1.CurrentActivityPrinter(props);
}
}
}
exports.CliIoHost = CliIoHost;
/**
* This IoHost implementation considers a request promptable, if:
* - it's a yes/no confirmation
* - asking for a string or number value
*/
function isPromptableRequest(msg) {
return isConfirmationPrompt(msg)
|| typeof msg.defaultResponse === 'string'
|| typeof msg.defaultResponse === 'number';
}
/**
* Check if the request is a confirmation prompt
* We treat all requests with a boolean response as confirmation prompts
*/
function isConfirmationPrompt(msg) {
return typeof msg.defaultResponse === 'boolean';
}
/**
* Helper to extract information for promptly from the request
*/
function extractPromptInfo(msg) {
const isNumber = (typeof msg.defaultResponse === 'number');
const defaultResponse = util.format(msg.defaultResponse);
return {
default: defaultResponse,
defaultDesc: 'defaultDescription' in msg && msg.defaultDescription ? util.format(msg.defaultDescription) : defaultResponse,
convertAnswer: isNumber ? (v) => Number(v) : (v) => String(v),
};
}
const styleMap = {
error: chalk.red,
warn: chalk.yellow,
result: chalk.white,
info: chalk.white,
debug: chalk.gray,
trace: chalk.gray,
};
/**
* Returns true if the current process is running in a CI environment
* @returns true if the current process is running in a CI environment
*/
function isCI() {
return process.env.CI !== undefined && process.env.CI !== 'false' && process.env.CI !== '0';
}
function targetStreamObject(x) {
switch (x) {
case 'stderr':
return process.stderr;
case 'stdout':
return process.stdout;
case 'drop':
return undefined;
}
}
function isNoticesMessage(msg) {
return api_private_1.IO.CDK_TOOLKIT_I0100.is(msg) || api_private_1.IO.CDK_TOOLKIT_W0101.is(msg) || api_private_1.IO.CDK_TOOLKIT_E0101.is(msg) || api_private_1.IO.CDK_TOOLKIT_I0101.is(msg);
}
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* as util from 'node:util';\nimport { RequireApproval } from '@aws-cdk/cloud-assembly-schema';\nimport { ToolkitError } from '@aws-cdk/toolkit-lib';\nimport type { IIoHost, IoMessage, IoMessageCode, IoMessageLevel, IoRequest, ToolkitAction } from '@aws-cdk/toolkit-lib';\nimport * as chalk from 'chalk';\nimport * as promptly from 'promptly';\nimport type { IoHelper, ActivityPrinterProps, IActivityPrinter } from '../../../lib/api-private';\nimport { asIoHelper, IO, isMessageRelevantForLevel, CurrentActivityPrinter, HistoryActivityPrinter } from '../../../lib/api-private';\nimport { StackActivityProgress } from '../../commands/deploy';\n\nexport type { IIoHost, IoMessage, IoMessageCode, IoMessageLevel, IoRequest };\n\n/**\n * The current action being performed by the CLI. 'none' represents the absence of an action.\n */\ntype CliAction =\n| ToolkitAction\n| 'context'\n| 'docs'\n| 'notices'\n| 'version'\n| 'none';\n\nexport interface CliIoHostProps {\n  /**\n   * The initial Toolkit action the hosts starts with.\n   *\n   * @default 'none'\n   */\n  readonly currentAction?: CliAction;\n\n  /**\n   * Determines the verbosity of the output.\n   *\n   * The CliIoHost will still receive all messages and requests,\n   * but only the messages included in this level will be printed.\n   *\n   * @default 'info'\n   */\n  readonly logLevel?: IoMessageLevel;\n\n  /**\n   * Overrides the automatic TTY detection.\n   *\n   * When TTY is disabled, the CLI will have no interactions or color.\n   *\n   * @default - determined from the current process\n   */\n  readonly isTTY?: boolean;\n\n  /**\n   * Whether the CliIoHost is running in CI mode.\n   *\n   * In CI mode, all non-error output goes to stdout instead of stderr.\n   * Set to false in the CliIoHost constructor it will be overwritten if the CLI CI argument is passed\n   *\n   * @default - determined from the environment, specifically based on `process.env.CI`\n   */\n  readonly isCI?: boolean;\n\n  /**\n   * In what scenarios should the CliIoHost ask for approval\n   *\n   * @default RequireApproval.BROADENING\n   */\n  readonly requireDeployApproval?: RequireApproval;\n\n  /**\n   * The initial Toolkit action the hosts starts with.\n   *\n   * @default StackActivityProgress.BAR\n   */\n  readonly stackProgress?: StackActivityProgress;\n}\n\n/**\n * A type for configuring a target stream\n */\nexport type TargetStream = 'stdout' | 'stderr' | 'drop';\n\n/**\n * A simple IO host for the CLI that writes messages to the console.\n */\nexport class CliIoHost implements IIoHost {\n  /**\n   * Returns the singleton instance\n   */\n  static instance(props: CliIoHostProps = {}, forceNew = false): CliIoHost {\n    if (forceNew || !CliIoHost._instance) {\n      CliIoHost._instance = new CliIoHost(props);\n    }\n    return CliIoHost._instance;\n  }\n\n  /**\n   * Singleton instance of the CliIoHost\n   */\n  private static _instance: CliIoHost | undefined;\n\n  /**\n   * The current action being performed by the CLI.\n   */\n  public currentAction: CliAction;\n\n  /**\n   * Whether the CliIoHost is running in CI mode.\n   *\n   * In CI mode, all non-error output goes to stdout instead of stderr.\n   */\n  public isCI: boolean;\n\n  /**\n   * Whether the host can use interactions and message styling.\n   */\n  public isTTY: boolean;\n\n  /**\n   * The current threshold.\n   *\n   * Messages with a lower priority level will be ignored.\n   */\n  public logLevel: IoMessageLevel;\n\n  /**\n   * The conditions for requiring approval in this CliIoHost.\n   */\n  public requireDeployApproval: RequireApproval;\n\n  /**\n   * Configure the target stream for notices\n   *\n   * (Not a setter because there's no need for additional logic when this value\n   * is changed yet)\n   */\n  public noticesDestination: TargetStream = 'stderr';\n\n  private _internalIoHost?: IIoHost;\n  private _progress: StackActivityProgress = StackActivityProgress.BAR;\n\n  // Stack Activity Printer\n  private activityPrinter?: IActivityPrinter;\n\n  // Corked Logging\n  private corkedCounter = 0;\n  private readonly corkedLoggingBuffer: IoMessage<unknown>[] = [];\n\n  private constructor(props: CliIoHostProps = {}) {\n    this.currentAction = props.currentAction ?? 'none';\n    this.isTTY = props.isTTY ?? process.stdout.isTTY ?? false;\n    this.logLevel = props.logLevel ?? 'info';\n    this.isCI = props.isCI ?? isCI();\n    this.requireDeployApproval = props.requireDeployApproval ?? RequireApproval.BROADENING;\n\n    this.stackProgress = props.stackProgress ?? StackActivityProgress.BAR;\n  }\n\n  /**\n   * Returns the singleton instance\n   */\n  public registerIoHost(ioHost: IIoHost) {\n    if (ioHost !== this) {\n      this._internalIoHost = ioHost;\n    }\n  }\n\n  /**\n   * Update the stackProgress preference.\n   */\n  public set stackProgress(type: StackActivityProgress) {\n    this._progress = type;\n  }\n\n  /**\n   * Gets the stackProgress value.\n   *\n   * This takes into account other state of the ioHost,\n   * like if isTTY and isCI.\n   */\n  public get stackProgress(): StackActivityProgress {\n    // We can always use EVENTS\n    if (this._progress === StackActivityProgress.EVENTS) {\n      return this._progress;\n    }\n\n    // if a debug message (and thus any more verbose messages) are relevant to the current log level, we have verbose logging\n    const verboseLogging = isMessageRelevantForLevel({ level: 'debug' }, this.logLevel);\n    if (verboseLogging) {\n      return StackActivityProgress.EVENTS;\n    }\n\n    // On Windows we cannot use fancy output\n    const isWindows = process.platform === 'win32';\n    if (isWindows) {\n      return StackActivityProgress.EVENTS;\n    }\n\n    // On some CI systems (such as CircleCI) output still reports as a TTY so we also\n    // need an individual check for whether we're running on CI.\n    // see: https://discuss.circleci.com/t/circleci-terminal-is-a-tty-but-term-is-not-set/9965\n    const fancyOutputAvailable = this.isTTY && !this.isCI;\n    if (!fancyOutputAvailable) {\n      return StackActivityProgress.EVENTS;\n    }\n\n    // Use the user preference\n    return this._progress;\n  }\n\n  public get defaults() {\n    return this.asIoHelper().defaults;\n  }\n\n  public asIoHelper(): IoHelper {\n    return asIoHelper(this, this.currentAction as any);\n  }\n\n  /**\n   * Executes a block of code with corked logging. All log messages during execution\n   * are buffered and only written when all nested cork blocks complete (when CORK_COUNTER reaches 0).\n   * The corking is bound to the specific instance of the CliIoHost.\n   *\n   * @param block - Async function to execute with corked logging\n   * @returns Promise that resolves with the block's return value\n   */\n  public async withCorkedLogging<T>(block: () => Promise<T>): Promise<T> {\n    this.corkedCounter++;\n    try {\n      return await block();\n    } finally {\n      this.corkedCounter--;\n      if (this.corkedCounter === 0) {\n        // Process each buffered message through notify\n        for (const ioMessage of this.corkedLoggingBuffer) {\n          await this.notify(ioMessage);\n        }\n        // remove all buffered messages in-place\n        this.corkedLoggingBuffer.splice(0);\n      }\n    }\n  }\n\n  /**\n   * Notifies the host of a message.\n   * The caller waits until the notification completes.\n   */\n  public async notify(msg: IoMessage<unknown>): Promise<void> {\n    if (this._internalIoHost) {\n      return this._internalIoHost.notify(msg);\n    }\n\n    if (this.isStackActivity(msg)) {\n      if (!this.activityPrinter) {\n        this.activityPrinter = this.makeActivityPrinter();\n      }\n      await this.activityPrinter.notify(msg);\n      return;\n    }\n\n    if (!isMessageRelevantForLevel(msg, this.logLevel)) {\n      return;\n    }\n\n    if (this.corkedCounter > 0) {\n      this.corkedLoggingBuffer.push(msg);\n      return;\n    }\n\n    const output = this.formatMessage(msg);\n    const stream = this.selectStream(msg);\n    stream?.write(output);\n  }\n\n  /**\n   * Detect stack activity messages so they can be send to the printer.\n   */\n  private isStackActivity(msg: IoMessage<unknown>) {\n    return msg.code && [\n      'CDK_TOOLKIT_I5501',\n      'CDK_TOOLKIT_I5502',\n      'CDK_TOOLKIT_I5503',\n    ].includes(msg.code);\n  }\n\n  /**\n   * Detect special messages encode information about whether or not\n   * they require approval\n   */\n  private skipApprovalStep(msg: IoRequest<any, any>): boolean {\n    const approvalToolkitCodes = ['CDK_TOOLKIT_I5060'];\n    if (!(msg.code && approvalToolkitCodes.includes(msg.code))) {\n      false;\n    }\n\n    switch (this.requireDeployApproval) {\n      // Never require approval\n      case RequireApproval.NEVER:\n        return true;\n      // Always require approval\n      case RequireApproval.ANYCHANGE:\n        return false;\n      // Require approval if changes include broadening permissions\n      case RequireApproval.BROADENING:\n        return ['none', 'non-broadening'].includes(msg.data?.permissionChangeType);\n    }\n  }\n\n  /**\n   * Determines the output stream, based on message and configuration.\n   */\n  private selectStream(msg: IoMessage<any>): NodeJS.WriteStream | undefined {\n    if (isNoticesMessage(msg)) {\n      return targetStreamObject(this.noticesDestination);\n    }\n\n    return this.selectStreamFromLevel(msg.level);\n  }\n\n  /**\n   * Determines the output stream, based on message level and configuration.\n   */\n  private selectStreamFromLevel(level: IoMessageLevel): NodeJS.WriteStream {\n    // The stream selection policy for the CLI is the following:\n    //\n    //   (1) Messages of level `result` always go to `stdout`\n    //   (2) Messages of level `error` always go to `stderr`.\n    //   (3a) All remaining messages go to `stderr`.\n    //   (3b) If we are in CI mode, all remaining messages go to `stdout`.\n    //\n    switch (level) {\n      case 'error':\n        return process.stderr;\n      case 'result':\n        return process.stdout;\n      default:\n        return this.isCI ? process.stdout : process.stderr;\n    }\n  }\n\n  /**\n   * Notifies the host of a message that requires a response.\n   *\n   * If the host does not return a response the suggested\n   * default response from the input message will be used.\n   */\n  public async requestResponse<DataType, ResponseType>(msg: IoRequest<DataType, ResponseType>): Promise<ResponseType> {\n    // First call out to a registered instance if we have one\n    if (this._internalIoHost) {\n      return this._internalIoHost.requestResponse(msg);\n    }\n\n    // If the request cannot be prompted for by the CliIoHost, we just accept the default\n    if (!isPromptableRequest(msg)) {\n      await this.notify(msg);\n      return msg.defaultResponse;\n    }\n\n    const response = await this.withCorkedLogging(async (): Promise<string | number | true> => {\n      // prepare prompt data\n      // @todo this format is not defined anywhere, probably should be\n      const data: {\n        motivation?: string;\n        concurrency?: number;\n        responseDescription?: string;\n      } = msg.data ?? {};\n\n      const motivation = data.motivation ?? 'User input is needed';\n      const concurrency = data.concurrency ?? 0;\n      const responseDescription = data.responseDescription;\n\n      // only talk to user if STDIN is a terminal (otherwise, fail)\n      if (!this.isTTY) {\n        throw new ToolkitError(`${motivation}, but terminal (TTY) is not attached so we are unable to get a confirmation from the user`);\n      }\n\n      // only talk to user if concurrency is 1 (otherwise, fail)\n      if (concurrency > 1) {\n        throw new ToolkitError(`${motivation}, but concurrency is greater than 1 so we are unable to get a confirmation from the user`);\n      }\n\n      // Special approval prompt\n      // Determine if the message needs approval. If it does, continue (it is a basic confirmation prompt)\n      // If it does not, return success (true). We only check messages with codes that we are aware\n      // are requires approval codes.\n      if (this.skipApprovalStep(msg)) {\n        return true;\n      }\n\n      // Basic confirmation prompt\n      // We treat all requests with a boolean response as confirmation prompts\n      if (isConfirmationPrompt(msg)) {\n        const confirmed = await promptly.confirm(`${chalk.cyan(msg.message)} (y/n)`);\n        if (!confirmed) {\n          throw new ToolkitError('Aborted by user');\n        }\n        return confirmed;\n      }\n\n      // Asking for a specific value\n      const prompt = extractPromptInfo(msg);\n      const desc = responseDescription ?? prompt.default;\n      const answer = await promptly.prompt(`${chalk.cyan(msg.message)}${desc ? ` (${desc})` : ''}`, {\n        default: prompt.default,\n        trim: true,\n      });\n      return prompt.convertAnswer(answer);\n    });\n\n    // We need to cast this because it is impossible to narrow the generic type\n    // isPromptableRequest ensures that the response type is one we can prompt for\n    // the remaining code ensure we are indeed returning the correct type\n    return response as ResponseType;\n  }\n\n  /**\n   * Formats a message for console output with optional color support\n   */\n  private formatMessage(msg: IoMessage<unknown>): string {\n    // apply provided style or a default style if we're in TTY mode\n    let message_text = this.isTTY\n      ? styleMap[msg.level](msg.message)\n      : msg.message;\n\n    // prepend timestamp if IoMessageLevel is DEBUG or TRACE. Postpend a newline.\n    return ((msg.level === 'debug' || msg.level === 'trace')\n      ? `[${this.formatTime(msg.time)}] ${message_text}`\n      : message_text) + '\\n';\n  }\n\n  /**\n   * Formats date to HH:MM:SS\n   */\n  private formatTime(d: Date): string {\n    const pad = (n: number): string => n.toString().padStart(2, '0');\n    return `${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}`;\n  }\n\n  /**\n   * Get an instance of the ActivityPrinter\n   */\n  private makeActivityPrinter() {\n    const props: ActivityPrinterProps = {\n      stream: this.selectStreamFromLevel('info'),\n    };\n\n    switch (this.stackProgress) {\n      case StackActivityProgress.EVENTS:\n        return new HistoryActivityPrinter(props);\n      case StackActivityProgress.BAR:\n        return new CurrentActivityPrinter(props);\n    }\n  }\n}\n\n/**\n * This IoHost implementation considers a request promptable, if:\n * - it's a yes/no confirmation\n * - asking for a string or number value\n */\nfunction isPromptableRequest(msg: IoRequest<any, any>): msg is IoRequest<any, string | number | boolean> {\n  return isConfirmationPrompt(msg)\n    || typeof msg.defaultResponse === 'string'\n    || typeof msg.defaultResponse === 'number';\n}\n\n/**\n * Check if the request is a confirmation prompt\n * We treat all requests with a boolean response as confirmation prompts\n */\nfunction isConfirmationPrompt(msg: IoRequest<any, any>): msg is IoRequest<any, boolean> {\n  return typeof msg.defaultResponse === 'boolean';\n}\n\n/**\n * Helper to extract information for promptly from the request\n */\nfunction extractPromptInfo(msg: IoRequest<any, any>): {\n  default: string;\n  defaultDesc: string;\n  convertAnswer: (input: string) => string | number;\n} {\n  const isNumber = (typeof msg.defaultResponse === 'number');\n  const defaultResponse = util.format(msg.defaultResponse);\n  return {\n    default: defaultResponse,\n    defaultDesc: 'defaultDescription' in msg && msg.defaultDescription ? util.format(msg.defaultDescription) : defaultResponse,\n    convertAnswer: isNumber ? (v) => Number(v) : (v) => String(v),\n  };\n}\n\nconst styleMap: Record<IoMessageLevel, (str: string) => string> = {\n  error: chalk.red,\n  warn: chalk.yellow,\n  result: chalk.white,\n  info: chalk.white,\n  debug: chalk.gray,\n  trace: chalk.gray,\n};\n\n/**\n * Returns true if the current process is running in a CI environment\n * @returns true if the current process is running in a CI environment\n */\nexport function isCI(): boolean {\n  return process.env.CI !== undefined && process.env.CI !== 'false' && process.env.CI !== '0';\n}\n\nfunction targetStreamObject(x: TargetStream): NodeJS.WriteStream | undefined {\n  switch (x) {\n    case 'stderr':\n      return process.stderr;\n    case 'stdout':\n      return process.stdout;\n    case 'drop':\n      return undefined;\n  }\n}\n\nfunction isNoticesMessage(msg: IoMessage<unknown>) {\n  return IO.CDK_TOOLKIT_I0100.is(msg) || IO.CDK_TOOLKIT_W0101.is(msg) || IO.CDK_TOOLKIT_E0101.is(msg) || IO.CDK_TOOLKIT_I0101.is(msg);\n}\n"]}