settings.js
1 "use strict"; 2 Object.defineProperty(exports, "__esModule", { value: true }); 3 exports.Settings = exports.Context = exports.Configuration = exports.Command = exports.TRANSIENT_CONTEXT_KEY = exports.USER_DEFAULTS = exports.PROJECT_CONTEXT = exports.PROJECT_CONFIG = void 0; 4 const os = require("os"); 5 const fs_path = require("path"); 6 const fs = require("fs-extra"); 7 const logging_1 = require("./logging"); 8 const util = require("./util"); 9 exports.PROJECT_CONFIG = 'cdk.json'; 10 exports.PROJECT_CONTEXT = 'cdk.context.json'; 11 exports.USER_DEFAULTS = '~/.cdk.json'; 12 /** 13 * If a context value is an object with this key set to a truthy value, it won't be saved to cdk.context.json 14 */ 15 exports.TRANSIENT_CONTEXT_KEY = '$dontSaveContext'; 16 const CONTEXT_KEY = 'context'; 17 var Command; 18 (function (Command) { 19 Command["LS"] = "ls"; 20 Command["LIST"] = "list"; 21 Command["DIFF"] = "diff"; 22 Command["BOOTSTRAP"] = "bootstrap"; 23 Command["DEPLOY"] = "deploy"; 24 Command["DESTROY"] = "destroy"; 25 Command["SYNTHESIZE"] = "synthesize"; 26 Command["SYNTH"] = "synth"; 27 Command["METADATA"] = "metadata"; 28 Command["INIT"] = "init"; 29 Command["VERSION"] = "version"; 30 })(Command = exports.Command || (exports.Command = {})); 31 const BUNDLING_COMMANDS = [ 32 Command.DEPLOY, 33 Command.DIFF, 34 Command.SYNTH, 35 Command.SYNTHESIZE, 36 ]; 37 /** 38 * All sources of settings combined 39 */ 40 class Configuration { 41 constructor(props = {}) { 42 this.props = props; 43 this.settings = new Settings(); 44 this.context = new Context(); 45 this.defaultConfig = new Settings({ 46 versionReporting: true, 47 pathMetadata: true, 48 output: 'cdk.out', 49 }); 50 this.loaded = false; 51 this.commandLineArguments = props.commandLineArguments 52 ? Settings.fromCommandLineArguments(props.commandLineArguments) 53 : new Settings(); 54 this.commandLineContext = this.commandLineArguments.subSettings([CONTEXT_KEY]).makeReadOnly(); 55 } 56 get projectConfig() { 57 if (!this._projectConfig) { 58 throw new Error('#load has not been called yet!'); 59 } 60 return this._projectConfig; 61 } 62 get projectContext() { 63 if (!this._projectContext) { 64 throw new Error('#load has not been called yet!'); 65 } 66 return this._projectContext; 67 } 68 /** 69 * Load all config 70 */ 71 async load() { 72 var _a; 73 const userConfig = await loadAndLog(exports.USER_DEFAULTS); 74 this._projectConfig = await loadAndLog(exports.PROJECT_CONFIG); 75 this._projectContext = await loadAndLog(exports.PROJECT_CONTEXT); 76 const readUserContext = (_a = this.props.readUserContext) !== null && _a !== void 0 ? _a : true; 77 const contextSources = [ 78 this.commandLineContext, 79 this.projectConfig.subSettings([CONTEXT_KEY]).makeReadOnly(), 80 this.projectContext, 81 ]; 82 if (readUserContext) { 83 contextSources.push(userConfig.subSettings([CONTEXT_KEY]).makeReadOnly()); 84 } 85 this.context = new Context(...contextSources); 86 // Build settings from what's left 87 this.settings = this.defaultConfig 88 .merge(userConfig) 89 .merge(this.projectConfig) 90 .merge(this.commandLineArguments) 91 .makeReadOnly(); 92 logging_1.debug('merged settings:', this.settings.all); 93 this.loaded = true; 94 return this; 95 } 96 /** 97 * Save the project context 98 */ 99 async saveContext() { 100 if (!this.loaded) { 101 return this; 102 } // Avoid overwriting files with nothing 103 await this.projectContext.save(exports.PROJECT_CONTEXT); 104 return this; 105 } 106 } 107 exports.Configuration = Configuration; 108 async function loadAndLog(fileName) { 109 const ret = new Settings(); 110 await ret.load(fileName); 111 if (!ret.empty) { 112 logging_1.debug(fileName + ':', JSON.stringify(ret.all, undefined, 2)); 113 } 114 return ret; 115 } 116 /** 117 * Class that supports overlaying property bags 118 * 119 * Reads come from the first property bag that can has the given key, 120 * writes go to the first property bag that is not readonly. A write 121 * will remove the value from all property bags after the first 122 * writable one. 123 */ 124 class Context { 125 constructor(...bags) { 126 this.bags = bags.length > 0 ? bags : [new Settings()]; 127 } 128 get keys() { 129 return Object.keys(this.all); 130 } 131 has(key) { 132 return this.keys.indexOf(key) > -1; 133 } 134 get all() { 135 let ret = new Settings(); 136 // In reverse order so keys to the left overwrite keys to the right of them 137 for (const bag of [...this.bags].reverse()) { 138 ret = ret.merge(bag); 139 } 140 return ret.all; 141 } 142 get(key) { 143 for (const bag of this.bags) { 144 const v = bag.get([key]); 145 if (v !== undefined) { 146 return v; 147 } 148 } 149 return undefined; 150 } 151 set(key, value) { 152 for (const bag of this.bags) { 153 if (bag.readOnly) { 154 continue; 155 } 156 // All bags past the first one have the value erased 157 bag.set([key], value); 158 value = undefined; 159 } 160 } 161 unset(key) { 162 this.set(key, undefined); 163 } 164 clear() { 165 for (const key of this.keys) { 166 this.unset(key); 167 } 168 } 169 } 170 exports.Context = Context; 171 /** 172 * A single bag of settings 173 */ 174 class Settings { 175 constructor(settings = {}, readOnly = false) { 176 this.settings = settings; 177 this.readOnly = readOnly; 178 } 179 /** 180 * Parse Settings out of CLI arguments. 181 * 182 * CLI arguments in must be accessed in the CLI code via 183 * `configuration.settings.get(['argName'])` instead of via `args.argName`. 184 * 185 * The advantage is that they can be configured via `cdk.json` and 186 * `$HOME/.cdk.json`. Arguments not listed below and accessed via this object 187 * can only be specified on the command line. 188 * 189 * @param argv the received CLI arguments. 190 * @returns a new Settings object. 191 */ 192 static fromCommandLineArguments(argv) { 193 var _a; 194 const context = this.parseStringContextListToObject(argv); 195 const tags = this.parseStringTagsListToObject(expectStringList(argv.tags)); 196 // Determine bundling stacks 197 let bundlingStacks; 198 if (BUNDLING_COMMANDS.includes(argv._[0])) { 199 // If we deploy, diff or synth a list of stacks exclusively we skip 200 // bundling for all other stacks. 201 bundlingStacks = argv.exclusively 202 ? (_a = argv.STACKS) !== null && _a !== void 0 ? _a : ['*'] : ['*']; 203 } 204 else { // Skip bundling for all stacks 205 bundlingStacks = []; 206 } 207 return new Settings({ 208 app: argv.app, 209 browser: argv.browser, 210 context, 211 debug: argv.debug, 212 tags, 213 language: argv.language, 214 pathMetadata: argv.pathMetadata, 215 assetMetadata: argv.assetMetadata, 216 profile: argv.profile, 217 plugin: argv.plugin, 218 requireApproval: argv.requireApproval, 219 toolkitStackName: argv.toolkitStackName, 220 toolkitBucket: { 221 bucketName: argv.bootstrapBucketName, 222 kmsKeyId: argv.bootstrapKmsKeyId, 223 }, 224 versionReporting: argv.versionReporting, 225 staging: argv.staging, 226 output: argv.output, 227 outputsFile: argv.outputsFile, 228 progress: argv.progress, 229 bundlingStacks, 230 lookups: argv.lookups, 231 rollback: argv.rollback, 232 }); 233 } 234 static mergeAll(...settings) { 235 let ret = new Settings(); 236 for (const setting of settings) { 237 ret = ret.merge(setting); 238 } 239 return ret; 240 } 241 static parseStringContextListToObject(argv) { 242 const context = {}; 243 for (const assignment of (argv.context || [])) { 244 const parts = assignment.split(/=(.*)/, 2); 245 if (parts.length === 2) { 246 logging_1.debug('CLI argument context: %s=%s', parts[0], parts[1]); 247 if (parts[0].match(/^aws:.+/)) { 248 throw new Error(`User-provided context cannot use keys prefixed with 'aws:', but ${parts[0]} was provided.`); 249 } 250 context[parts[0]] = parts[1]; 251 } 252 else { 253 logging_1.warning('Context argument is not an assignment (key=value): %s', assignment); 254 } 255 } 256 return context; 257 } 258 /** 259 * Parse tags out of arguments 260 * 261 * Return undefined if no tags were provided, return an empty array if only empty 262 * strings were provided 263 */ 264 static parseStringTagsListToObject(argTags) { 265 if (argTags === undefined) { 266 return undefined; 267 } 268 if (argTags.length === 0) { 269 return undefined; 270 } 271 const nonEmptyTags = argTags.filter(t => t !== ''); 272 if (nonEmptyTags.length === 0) { 273 return []; 274 } 275 const tags = []; 276 for (const assignment of nonEmptyTags) { 277 const parts = assignment.split('=', 2); 278 if (parts.length === 2) { 279 logging_1.debug('CLI argument tags: %s=%s', parts[0], parts[1]); 280 tags.push({ 281 Key: parts[0], 282 Value: parts[1], 283 }); 284 } 285 else { 286 logging_1.warning('Tags argument is not an assignment (key=value): %s', assignment); 287 } 288 } 289 return tags.length > 0 ? tags : undefined; 290 } 291 async load(fileName) { 292 if (this.readOnly) { 293 throw new Error(`Can't load ${fileName}: settings object is readonly`); 294 } 295 this.settings = {}; 296 const expanded = expandHomeDir(fileName); 297 if (await fs.pathExists(expanded)) { 298 this.settings = await fs.readJson(expanded); 299 } 300 // See https://github.com/aws/aws-cdk/issues/59 301 this.prohibitContextKey('default-account', fileName); 302 this.prohibitContextKey('default-region', fileName); 303 this.warnAboutContextKey('aws:', fileName); 304 return this; 305 } 306 async save(fileName) { 307 const expanded = expandHomeDir(fileName); 308 await fs.writeJson(expanded, stripTransientValues(this.settings), { spaces: 2 }); 309 return this; 310 } 311 get all() { 312 return this.get([]); 313 } 314 merge(other) { 315 return new Settings(util.deepMerge(this.settings, other.settings)); 316 } 317 subSettings(keyPrefix) { 318 return new Settings(this.get(keyPrefix) || {}, false); 319 } 320 makeReadOnly() { 321 return new Settings(this.settings, true); 322 } 323 clear() { 324 if (this.readOnly) { 325 throw new Error('Cannot clear(): settings are readonly'); 326 } 327 this.settings = {}; 328 } 329 get empty() { 330 return Object.keys(this.settings).length === 0; 331 } 332 get(path) { 333 return util.deepClone(util.deepGet(this.settings, path)); 334 } 335 set(path, value) { 336 if (this.readOnly) { 337 throw new Error(`Can't set ${path}: settings object is readonly`); 338 } 339 if (path.length === 0) { 340 // deepSet can't handle this case 341 this.settings = value; 342 } 343 else { 344 util.deepSet(this.settings, path, value); 345 } 346 return this; 347 } 348 unset(path) { 349 this.set(path, undefined); 350 } 351 prohibitContextKey(key, fileName) { 352 if (!this.settings.context) { 353 return; 354 } 355 if (key in this.settings.context) { 356 // eslint-disable-next-line max-len 357 throw new Error(`The 'context.${key}' key was found in ${fs_path.resolve(fileName)}, but it is no longer supported. Please remove it.`); 358 } 359 } 360 warnAboutContextKey(prefix, fileName) { 361 if (!this.settings.context) { 362 return; 363 } 364 for (const contextKey of Object.keys(this.settings.context)) { 365 if (contextKey.startsWith(prefix)) { 366 // eslint-disable-next-line max-len 367 logging_1.warning(`A reserved context key ('context.${prefix}') key was found in ${fs_path.resolve(fileName)}, it might cause surprising behavior and should be removed.`); 368 } 369 } 370 } 371 } 372 exports.Settings = Settings; 373 function expandHomeDir(x) { 374 if (x.startsWith('~')) { 375 return fs_path.join(os.homedir(), x.substr(1)); 376 } 377 return x; 378 } 379 /** 380 * Return all context value that are not transient context values 381 */ 382 function stripTransientValues(obj) { 383 const ret = {}; 384 for (const [key, value] of Object.entries(obj)) { 385 if (!isTransientValue(value)) { 386 ret[key] = value; 387 } 388 } 389 return ret; 390 } 391 /** 392 * Return whether the given value is a transient context value 393 * 394 * Values that are objects with a magic key set to a truthy value are considered transient. 395 */ 396 function isTransientValue(value) { 397 return typeof value === 'object' && value !== null && value[exports.TRANSIENT_CONTEXT_KEY]; 398 } 399 function expectStringList(x) { 400 if (x === undefined) { 401 return undefined; 402 } 403 if (!Array.isArray(x)) { 404 throw new Error(`Expected array, got '${x}'`); 405 } 406 const nonStrings = x.filter(e => typeof e !== 'string'); 407 if (nonStrings.length > 0) { 408 throw new Error(`Expected list of strings, found ${nonStrings}`); 409 } 410 return x; 411 } 412 //# 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* as os from 'os';\nimport * as fs_path from 'path';\nimport * as fs from 'fs-extra';\nimport { Tag } from './cdk-toolkit';\nimport { debug, warning } from './logging';\nimport * as util from './util';\n\nexport type SettingsMap = {[key: string]: any};\n\nexport const PROJECT_CONFIG = 'cdk.json';\nexport const PROJECT_CONTEXT = 'cdk.context.json';\nexport const USER_DEFAULTS = '~/.cdk.json';\n\n/**\n * If a context value is an object with this key set to a truthy value, it won't be saved to cdk.context.json\n */\nexport const TRANSIENT_CONTEXT_KEY = '$dontSaveContext';\n\nconst CONTEXT_KEY = 'context';\n\nexport enum Command {\n  LS = 'ls',\n  LIST = 'list',\n  DIFF = 'diff',\n  BOOTSTRAP = 'bootstrap',\n  DEPLOY = 'deploy',\n  DESTROY = 'destroy',\n  SYNTHESIZE = 'synthesize',\n  SYNTH = 'synth',\n  METADATA = 'metadata',\n  INIT = 'init',\n  VERSION = 'version',\n}\n\nconst BUNDLING_COMMANDS = [\n  Command.DEPLOY,\n  Command.DIFF,\n  Command.SYNTH,\n  Command.SYNTHESIZE,\n];\n\nexport type Arguments = {\n  readonly _: [Command, ...string[]];\n  readonly exclusively?: boolean;\n  readonly STACKS?: string[];\n  readonly lookups?: boolean;\n  readonly [name: string]: unknown;\n};\n\nexport interface ConfigurationProps {\n  /**\n   * Configuration passed via command line arguments\n   *\n   * @default - Nothing passed\n   */\n  readonly commandLineArguments?: Arguments;\n\n  /**\n   * Whether or not to use context from `.cdk.json` in user home directory\n   *\n   * @default true\n   */\n  readonly readUserContext?: boolean;\n}\n\n/**\n * All sources of settings combined\n */\nexport class Configuration {\n  public settings = new Settings();\n  public context = new Context();\n\n  public readonly defaultConfig = new Settings({\n    versionReporting: true,\n    pathMetadata: true,\n    output: 'cdk.out',\n  });\n\n  private readonly commandLineArguments: Settings;\n  private readonly commandLineContext: Settings;\n  private 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Settings.fromCommandLineArguments(props.commandLineArguments)\n      : new Settings();\n    this.commandLineContext = this.commandLineArguments.subSettings([CONTEXT_KEY]).makeReadOnly();\n  }\n\n  private get projectConfig() {\n    if (!this._projectConfig) {\n      throw new Error('#load has not been called yet!');\n    }\n    return this._projectConfig;\n  }\n\n  private get projectContext() {\n    if (!this._projectContext) {\n      throw new Error('#load has not been called yet!');\n    }\n    return this._projectContext;\n  }\n\n  /**\n   * Load all config\n   */\n  public async load(): Promise<this> {\n    const userConfig = await loadAndLog(USER_DEFAULTS);\n    this._projectConfig = await loadAndLog(PROJECT_CONFIG);\n    this._projectContext = await loadAndLog(PROJECT_CONTEXT);\n\n    const readUserContext = this.props.readUserContext ?? true;\n\n    const contextSources = [\n      this.commandLineContext,\n      this.projectConfig.subSettings([CONTEXT_KEY]).makeReadOnly(),\n      this.projectContext,\n    ];\n    if (readUserContext) {\n      contextSources.push(userConfig.subSettings([CONTEXT_KEY]).makeReadOnly());\n    }\n\n    this.context = new Context(...contextSources);\n\n    // Build settings from what's left\n    this.settings = this.defaultConfig\n      .merge(userConfig)\n      .merge(this.projectConfig)\n      .merge(this.commandLineArguments)\n      .makeReadOnly();\n\n    debug('merged settings:', this.settings.all);\n\n    this.loaded = true;\n\n    return this;\n  }\n\n  /**\n   * Save the project context\n   */\n  public async saveContext(): Promise<this> {\n    if (!this.loaded) { return this; } // Avoid overwriting files with nothing\n\n    await this.projectContext.save(PROJECT_CONTEXT);\n\n    return this;\n  }\n}\n\nasync function loadAndLog(fileName: string): Promise<Settings> {\n  const ret = new Settings();\n  await ret.load(fileName);\n  if (!ret.empty) {\n    debug(fileName + ':', JSON.stringify(ret.all, undefined, 2));\n  }\n  return ret;\n}\n\n/**\n * Class that supports overlaying property bags\n *\n * Reads come from the first property bag that can has the given key,\n * writes go to the first property bag that is not readonly. A write\n * will remove the value from all property bags after the first\n * writable one.\n */\nexport class Context {\n  private readonly bags: Settings[];\n\n  constructor(...bags: Settings[]) {\n    this.bags = bags.length > 0 ? bags : [new Settings()];\n  }\n\n  public get keys(): string[] {\n    return Object.keys(this.all);\n  }\n\n  public has(key: string) {\n    return this.keys.indexOf(key) > -1;\n  }\n\n  public get all(): {[key: string]: any} {\n    let ret = new Settings();\n\n    // In reverse order so keys to the left overwrite keys to the right of them\n    for (const bag of [...this.bags].reverse()) {\n      ret = ret.merge(bag);\n    }\n\n    return ret.all;\n  }\n\n  public get(key: string): any {\n    for (const bag of this.bags) {\n      const v = bag.get([key]);\n      if (v !== undefined) { return v; }\n    }\n    return undefined;\n  }\n\n  public set(key: string, value: any) {\n    for (const bag of this.bags) {\n      if (bag.readOnly) { continue; }\n\n      // All bags past the first one have the value erased\n      bag.set([key], value);\n      value = undefined;\n    }\n  }\n\n  public unset(key: string) {\n    this.set(key, undefined);\n  }\n\n  public clear() {\n    for (const key of this.keys) {\n      this.unset(key);\n    }\n  }\n}\n\n/**\n * A single bag of settings\n */\nexport class Settings {\n\n  /**\n   * Parse Settings out of CLI arguments.\n   *\n   * CLI arguments in must be accessed in the CLI code via\n   * `configuration.settings.get(['argName'])` instead of via `args.argName`.\n   *\n   * The advantage is that they can be configured via `cdk.json` and\n   * `$HOME/.cdk.json`. Arguments not listed below and accessed via this object\n   * can only be specified on the command line.\n   *\n   * @param argv the received CLI arguments.\n   * @returns a new Settings object.\n   */\n  public static fromCommandLineArguments(argv: Arguments): Settings {\n    const context = this.parseStringContextListToObject(argv);\n    const tags = this.parseStringTagsListToObject(expectStringList(argv.tags));\n\n    // Determine bundling stacks\n    let bundlingStacks: string[];\n    if (BUNDLING_COMMANDS.includes(argv._[0])) {\n    // If we deploy, diff or synth a list of stacks exclusively we skip\n    // bundling for all other stacks.\n      bundlingStacks = argv.exclusively\n        ? argv.STACKS ?? ['*']\n        : ['*'];\n    } else { // Skip bundling for all stacks\n      bundlingStacks = [];\n    }\n\n    return new Settings({\n      app: argv.app,\n      browser: argv.browser,\n      context,\n      debug: argv.debug,\n      tags,\n      language: argv.language,\n      pathMetadata: argv.pathMetadata,\n      assetMetadata: argv.assetMetadata,\n      profile: argv.profile,\n      plugin: argv.plugin,\n      requireApproval: argv.requireApproval,\n      toolkitStackName: argv.toolkitStackName,\n      toolkitBucket: {\n        bucketName: argv.bootstrapBucketName,\n        kmsKeyId: argv.bootstrapKmsKeyId,\n      },\n      versionReporting: argv.versionReporting,\n      staging: argv.staging,\n      output: argv.output,\n      outputsFile: argv.outputsFile,\n      progress: argv.progress,\n      bundlingStacks,\n      lookups: argv.lookups,\n      rollback: argv.rollback,\n    });\n  }\n\n  public static mergeAll(...settings: Settings[]): Settings {\n    let ret = new Settings();\n    for (const setting of settings) {\n      ret = ret.merge(setting);\n    }\n    return ret;\n  }\n\n  private static parseStringContextListToObject(argv: Arguments): any {\n    const context: any = {};\n\n    for (const assignment of ((argv as any).context || [])) {\n      const parts = assignment.split(/=(.*)/, 2);\n      if (parts.length === 2) {\n        debug('CLI argument context: %s=%s', parts[0], parts[1]);\n        if (parts[0].match(/^aws:.+/)) {\n          throw new Error(`User-provided context cannot use keys prefixed with 'aws:', but ${parts[0]} was provided.`);\n        }\n        context[parts[0]] = parts[1];\n      } else {\n        warning('Context argument is not an assignment (key=value): %s', assignment);\n      }\n    }\n    return context;\n  }\n\n  /**\n   * Parse tags out of arguments\n   *\n   * Return undefined if no tags were provided, return an empty array if only empty\n   * strings were provided\n   */\n  private static parseStringTagsListToObject(argTags: string[] | undefined): Tag[] | undefined {\n    if (argTags === undefined) { return undefined; }\n    if (argTags.length === 0) { return undefined; }\n    const nonEmptyTags = argTags.filter(t => t !== '');\n    if (nonEmptyTags.length === 0) { return []; }\n\n    const tags: Tag[] = [];\n\n    for (const assignment of nonEmptyTags) {\n      const parts = assignment.split('=', 2);\n      if (parts.length === 2) {\n        debug('CLI argument tags: %s=%s', parts[0], parts[1]);\n        tags.push({\n          Key: parts[0],\n          Value: parts[1],\n        });\n      } else {\n        warning('Tags argument is not an assignment (key=value): %s', assignment);\n      }\n    }\n    return tags.length > 0 ? tags : undefined;\n  }\n\n  constructor(private settings: SettingsMap = {}, public readonly readOnly = false) {}\n\n  public async load(fileName: string): Promise<this> {\n    if (this.readOnly) {\n      throw new Error(`Can't load ${fileName}: settings object is readonly`);\n    }\n    this.settings = {};\n\n    const expanded = expandHomeDir(fileName);\n    if (await fs.pathExists(expanded)) {\n      this.settings = await fs.readJson(expanded);\n    }\n\n    // See https://github.com/aws/aws-cdk/issues/59\n    this.prohibitContextKey('default-account', fileName);\n    this.prohibitContextKey('default-region', fileName);\n    this.warnAboutContextKey('aws:', fileName);\n\n    return this;\n  }\n\n  public async save(fileName: string): Promise<this> {\n    const expanded = expandHomeDir(fileName);\n    await fs.writeJson(expanded, stripTransientValues(this.settings), { spaces: 2 });\n    return this;\n  }\n\n  public get all(): any {\n    return this.get([]);\n  }\n\n  public merge(other: Settings): Settings {\n    return new Settings(util.deepMerge(this.settings, other.settings));\n  }\n\n  public subSettings(keyPrefix: string[]) {\n    return new Settings(this.get(keyPrefix) || {}, false);\n  }\n\n  public makeReadOnly(): Settings {\n    return new Settings(this.settings, true);\n  }\n\n  public clear() {\n    if (this.readOnly) {\n      throw new Error('Cannot clear(): settings are readonly');\n    }\n    this.settings = {};\n  }\n\n  public get empty(): boolean {\n    return Object.keys(this.settings).length === 0;\n  }\n\n  public get(path: string[]): any {\n    return util.deepClone(util.deepGet(this.settings, path));\n  }\n\n  public set(path: string[], value: any): Settings {\n    if (this.readOnly) {\n      throw new Error(`Can't set ${path}: settings object is readonly`);\n    }\n    if (path.length === 0) {\n      // deepSet can't handle this case\n      this.settings = value;\n    } else {\n      util.deepSet(this.settings, path, value);\n    }\n    return this;\n  }\n\n  public unset(path: string[]) {\n    this.set(path, undefined);\n  }\n\n  private prohibitContextKey(key: string, fileName: string) {\n    if (!this.settings.context) { return; }\n    if (key in this.settings.context) {\n      // eslint-disable-next-line max-len\n      throw new Error(`The 'context.${key}' key was found in ${fs_path.resolve(fileName)}, but it is no longer supported. Please remove it.`);\n    }\n  }\n\n  private warnAboutContextKey(prefix: string, fileName: string) {\n    if (!this.settings.context) { return; }\n    for (const contextKey of Object.keys(this.settings.context)) {\n      if (contextKey.startsWith(prefix)) {\n        // eslint-disable-next-line max-len\n        warning(`A reserved context key ('context.${prefix}') key was found in ${fs_path.resolve(fileName)}, it might cause surprising behavior and should be removed.`);\n      }\n    }\n  }\n}\n\nfunction expandHomeDir(x: string) {\n  if (x.startsWith('~')) {\n    return fs_path.join(os.homedir(), x.substr(1));\n  }\n  return x;\n}\n\n/**\n * Return all context value that are not transient context values\n */\nfunction stripTransientValues(obj: {[key: string]: any}) {\n  const ret: any = {};\n  for (const [key, value] of Object.entries(obj)) {\n    if (!isTransientValue(value)) {\n      ret[key] = value;\n    }\n  }\n  return ret;\n}\n\n/**\n * Return whether the given value is a transient context value\n *\n * Values that are objects with a magic key set to a truthy value are considered transient.\n */\nfunction isTransientValue(value: any) {\n  return typeof value === 'object' && value !== null && (value as any)[TRANSIENT_CONTEXT_KEY];\n}\n\nfunction expectStringList(x: unknown): string[] | undefined {\n  if (x === undefined) { return undefined; }\n  if (!Array.isArray(x)) {\n    throw new Error(`Expected array, got '${x}'`);\n  }\n  const nonStrings = x.filter(e => typeof e !== 'string');\n  if (nonStrings.length > 0) {\n    throw new Error(`Expected list of strings, found ${nonStrings}`);\n  }\n  return x;\n}\n"]}