fix(ts-node): patch error

2018-07-01 17:30:05 +02:00 · 2018-07-01 17:30:05 +02:00 · cd549b8aaf
commit cd549b8aaf
parent dcf5c6ab22
8 changed files with 1188 additions and 36 deletions
--- a/22
+++ b/22
@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2018 Lossless GmbH (hello@lossless.com)
+Copyright (c) 2014 Blake Embrey (hello@blakeembrey.com)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
--- a/dist/index.js
+++ b/dist/index.js
@ -1,12 +1,12 @@
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-const tsNode = require("ts-node");
 const path = require("path");
+const tsNode = require("./tsnode");
 tsNode.register({
    compilerOptions: {
        lib: ['es2016', 'es2017']
    },
-    ignore: ['^(.(.*\.d\.ts))*$'],
+    skipIgnore: true,
    cacheDirectory: path.join(__dirname, '../tscache')
 });
 if (process.env.CLI_CALL_TSRUN) {
@ -17,4 +17,4 @@ if (process.env.CLI_CALL_TSRUN) {
    const pathToLoad = path.join(process.cwd(), pathToTsFile);
    Promise.resolve().then(() => require(pathToLoad));
 }
-//# sourceMappingURL=data:application/json;base64,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
+//# sourceMappingURL=data:application/json;base64,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
--- a/dist/tsnode.d.ts
+++ b/dist/tsnode.d.ts
@ -0,0 +1,99 @@
+import { BaseError } from 'make-error';
+import * as _ts from 'typescript';
+/**
+ * @internal
+ */
+export declare const INSPECT_CUSTOM: string | symbol;
+/**
+ * Common TypeScript interfaces between versions.
+ */
+export interface TSCommon {
+    version: typeof _ts.version;
+    sys: typeof _ts.sys;
+    ScriptSnapshot: typeof _ts.ScriptSnapshot;
+    displayPartsToString: typeof _ts.displayPartsToString;
+    createLanguageService: typeof _ts.createLanguageService;
+    getDefaultLibFilePath: typeof _ts.getDefaultLibFilePath;
+    getPreEmitDiagnostics: typeof _ts.getPreEmitDiagnostics;
+    flattenDiagnosticMessageText: typeof _ts.flattenDiagnosticMessageText;
+    transpileModule: typeof _ts.transpileModule;
+    ModuleKind: typeof _ts.ModuleKind;
+    ScriptTarget: typeof _ts.ScriptTarget;
+    findConfigFile: typeof _ts.findConfigFile;
+    readConfigFile: typeof _ts.readConfigFile;
+    parseJsonConfigFileContent: typeof _ts.parseJsonConfigFileContent;
+    formatDiagnostics: typeof _ts.formatDiagnostics;
+    formatDiagnosticsWithColorAndContext: typeof _ts.formatDiagnosticsWithColorAndContext;
+}
+/**
+ * Export the current version.
+ */
+export declare const VERSION: any;
+/**
+ * Registration options.
+ */
+export interface Options {
+    pretty?: boolean | null;
+    typeCheck?: boolean | null;
+    transpileOnly?: boolean | null;
+    files?: boolean | null;
+    cache?: boolean | null;
+    cacheDirectory?: string;
+    compiler?: string;
+    ignore?: string | string[];
+    project?: string;
+    skipIgnore?: boolean | null;
+    skipProject?: boolean | null;
+    compilerOptions?: object;
+    ignoreDiagnostics?: number | string | Array<number | string>;
+    readFile?: (path: string) => string | undefined;
+    fileExists?: (path: string) => boolean;
+    transformers?: _ts.CustomTransformers;
+}
+/**
+ * Information retrieved from type info check.
+ */
+export interface TypeInfo {
+    name: string;
+    comment: string;
+}
+/**
+ * Default register options.
+ */
+export declare const DEFAULTS: Options;
+/**
+ * Split a string array of values.
+ */
+export declare function split(value: string | undefined): string[];
+/**
+ * Parse a string as JSON.
+ */
+export declare function parse(value: string | undefined): object | undefined;
+/**
+ * Replace backslashes with forward slashes.
+ */
+export declare function normalizeSlashes(value: string): string;
+/**
+ * TypeScript diagnostics error.
+ */
+export declare class TSError extends BaseError {
+    diagnosticText: string;
+    diagnosticCodes: number[];
+    name: string;
+    constructor(diagnosticText: string, diagnosticCodes: number[]);
+}
+/**
+ * Return type for registering `ts-node`.
+ */
+export interface Register {
+    cwd: string;
+    extensions: string[];
+    cachedir: string;
+    ts: TSCommon;
+    compile(code: string, fileName: string, lineOffset?: number): string;
+    getTypeInfo(code: string, fileName: string, position: number): TypeInfo;
+}
+/**
+ * Register TypeScript compiler.
+ */
+export declare function register(opts?: Options): Register;
--- a/dist/tsnode.js
+++ b/dist/tsnode.js
--- a/package-lock.json
+++ b/package-lock.json
@ -101,11 +101,6 @@
        "object-keys": "^1.0.8"
      }
    },
-    "diff": {
-      "version": "3.5.0",
-      "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
-      "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA=="
-    },
    "es-abstract": {
      "version": "1.12.0",
      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.12.0.tgz",
@ -278,9 +273,9 @@
      }
    },
    "minimist": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
-      "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ="
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+      "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
    },
    "mkdirp": {
      "version": "0.5.1",
@ -288,13 +283,6 @@
      "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
      "requires": {
        "minimist": "0.0.8"
-      },
-      "dependencies": {
-        "minimist": {
-          "version": "0.0.8",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
-          "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0="
-        }
      }
    },
    "object-keys": {
@ -467,20 +455,6 @@
        "strip-bom": "^2.0.0"
      }
    },
-    "ts-node": {
-      "version": "6.1.0",
-      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-6.1.0.tgz",
-      "integrity": "sha512-mw11Bq08RZgrU/bzcVw/Ti9wNyefpOanXgWsHg008wyVHjvFhWxNatVVrciOAu8BcWSECoNOSunRzUokKH8Mmw==",
-      "requires": {
-        "arrify": "^1.0.0",
-        "diff": "^3.1.0",
-        "make-error": "^1.1.1",
-        "minimist": "^1.2.0",
-        "mkdirp": "^0.5.1",
-        "source-map-support": "^0.5.6",
-        "yn": "^2.0.0"
-      }
-    },
    "typescript": {
      "version": "2.9.1",
      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.9.1.tgz",
--- a/package.json
+++ b/package.json
@ -19,9 +19,13 @@
    "@types/node": "^10.3.0"
  },
  "dependencies": {
+    "arrify": "^1.0.1",
+    "make-error": "^1.3.4",
+    "mkdirp": "^0.5.1",
    "smartfile": "^4.2.28",
-    "ts-node": "^6.1.0",
-    "typescript": "^2.9.1"
+    "source-map-support": "^0.5.6",
+    "typescript": "^2.9.1",
+    "yn": "^2.0.0"
  },
  "private": false
 }
--- a/ts/index.ts
+++ b/ts/index.ts
@ -1,11 +1,11 @@
-import * as tsNode from 'ts-node';
 import * as path from 'path';
+import * as tsNode from './tsnode';

 tsNode.register({
  compilerOptions: {
    lib: [ 'es2016', 'es2017' ]
  },
-  ignore: ['^(.(.*\.d\.ts))*$'],
+  skipIgnore: true,
  cacheDirectory: path.join(__dirname, '../tscache')
 });

--- a/ts/tsnode.ts
+++ b/ts/tsnode.ts
@ -0,0 +1,613 @@
+import { relative, basename, extname, resolve, dirname, join } from 'path'
+import { readFileSync, writeFileSync } from 'fs'
+import { EOL, tmpdir, homedir } from 'os'
+import sourceMapSupport = require('source-map-support')
+import mkdirp = require('mkdirp')
+import crypto = require('crypto')
+import yn = require('yn')
+import arrify = require('arrify')
+import bufferFrom = require('buffer-from')
+import { BaseError } from 'make-error'
+import * as util from 'util'
+import * as _ts from 'typescript'
+
+/**
+ * @internal
+ */
+export const INSPECT_CUSTOM = util.inspect.custom || 'inspect'
+
+/**
+ * Debugging `ts-node`.
+ */
+const shouldDebug = yn(process.env.TS_NODE_DEBUG)
+const debug = shouldDebug ? console.log.bind(console, 'ts-node') : () => undefined
+const debugFn = shouldDebug ?
+  <T, U> (key: string, fn: (arg: T) => U) => {
+    return (x: T) => {
+      debug(key, x)
+      return fn(x)
+    }
+  } :
+  <T, U> (_: string, fn: (arg: T) => U) => fn
+
+/**
+ * Common TypeScript interfaces between versions.
+ */
+export interface TSCommon {
+  version: typeof _ts.version
+  sys: typeof _ts.sys
+  ScriptSnapshot: typeof _ts.ScriptSnapshot
+  displayPartsToString: typeof _ts.displayPartsToString
+  createLanguageService: typeof _ts.createLanguageService
+  getDefaultLibFilePath: typeof _ts.getDefaultLibFilePath
+  getPreEmitDiagnostics: typeof _ts.getPreEmitDiagnostics
+  flattenDiagnosticMessageText: typeof _ts.flattenDiagnosticMessageText
+  transpileModule: typeof _ts.transpileModule
+  ModuleKind: typeof _ts.ModuleKind
+  ScriptTarget: typeof _ts.ScriptTarget
+  findConfigFile: typeof _ts.findConfigFile
+  readConfigFile: typeof _ts.readConfigFile
+  parseJsonConfigFileContent: typeof _ts.parseJsonConfigFileContent
+  formatDiagnostics: typeof _ts.formatDiagnostics
+  formatDiagnosticsWithColorAndContext: typeof _ts.formatDiagnosticsWithColorAndContext
+}
+
+/**
+ * Export the current version.
+ */
+export const VERSION = require('../package.json').version
+
+/**
+ * Registration options.
+ */
+export interface Options {
+  pretty?: boolean | null
+  typeCheck?: boolean | null
+  transpileOnly?: boolean | null
+  files?: boolean | null
+  cache?: boolean | null
+  cacheDirectory?: string
+  compiler?: string
+  ignore?: string | string[]
+  project?: string
+  skipIgnore?: boolean | null
+  skipProject?: boolean | null
+  compilerOptions?: object
+  ignoreDiagnostics?: number | string | Array<number | string>
+  readFile?: (path: string) => string | undefined
+  fileExists?: (path: string) => boolean
+  transformers?: _ts.CustomTransformers
+}
+
+/**
+ * Track the project information.
+ */
+interface MemoryCache {
+  contents: { [path: string]: string | undefined }
+  versions: { [path: string]: number | undefined }
+  outputs: { [path: string]: string }
+}
+
+/**
+ * Information retrieved from type info check.
+ */
+export interface TypeInfo {
+  name: string
+  comment: string
+}
+
+/**
+ * Default register options.
+ */
+export const DEFAULTS: Options = {
+  files: yn(process.env['TS_NODE_FILES']),
+  cache: yn(process.env['TS_NODE_CACHE'], { default: true }),
+  pretty: yn(process.env['TS_NODE_PRETTY']),
+  cacheDirectory: process.env['TS_NODE_CACHE_DIRECTORY'],
+  compiler: process.env['TS_NODE_COMPILER'],
+  compilerOptions: parse(process.env['TS_NODE_COMPILER_OPTIONS']),
+  ignore: split(process.env['TS_NODE_IGNORE']),
+  project: process.env['TS_NODE_PROJECT'],
+  skipIgnore: yn(process.env['TS_NODE_SKIP_IGNORE']),
+  skipProject: yn(process.env['TS_NODE_SKIP_PROJECT']),
+  ignoreDiagnostics: split(process.env['TS_NODE_IGNORE_DIAGNOSTICS']),
+  typeCheck: yn(process.env['TS_NODE_TYPE_CHECK']),
+  transpileOnly: yn(process.env['TS_NODE_TRANSPILE_ONLY'])
+}
+
+/**
+ * Default TypeScript compiler options required by `ts-node`.
+ */
+const DEFAULT_COMPILER_OPTIONS = {
+  sourceMap: true,
+  inlineSourceMap: false,
+  inlineSources: true,
+  declaration: false,
+  noEmit: false,
+  outDir: '$$ts-node$$'
+}
+
+/**
+ * Split a string array of values.
+ */
+export function split (value: string | undefined) {
+  return typeof value === 'string' ? value.split(/ *, */g) : undefined
+}
+
+/**
+ * Parse a string as JSON.
+ */
+export function parse (value: string | undefined): object | undefined {
+  return typeof value === 'string' ? JSON.parse(value) : undefined
+}
+
+/**
+ * Replace backslashes with forward slashes.
+ */
+export function normalizeSlashes (value: string): string {
+  return value.replace(/\\/g, '/')
+}
+
+/**
+ * TypeScript diagnostics error.
+ */
+export class TSError extends BaseError {
+  name = 'TSError'
+
+  constructor (public diagnosticText: string, public diagnosticCodes: number[]) {
+    super(`⨯ Unable to compile TypeScript:\n${diagnosticText}`)
+  }
+
+  /**
+   * @internal
+   */
+  [INSPECT_CUSTOM] () {
+    return this.diagnosticText
+  }
+}
+
+/**
+ * Return type for registering `ts-node`.
+ */
+export interface Register {
+  cwd: string
+  extensions: string[]
+  cachedir: string
+  ts: TSCommon
+  compile (code: string, fileName: string, lineOffset?: number): string
+  getTypeInfo (code: string, fileName: string, position: number): TypeInfo
+}
+
+/**
+ * Return a default temp directory based on home directory of user.
+ */
+function getTmpDir (): string {
+  const hash = crypto.createHash('sha256').update(homedir(), 'utf8').digest('hex')
+
+  return join(tmpdir(), `ts-node-${hash}`)
+}
+
+/**
+ * Register TypeScript compiler.
+ */
+export function register (opts: Options = {}): Register {
+  const options = Object.assign({}, DEFAULTS, opts)
+  const cacheDirectory = options.cacheDirectory || getTmpDir()
+  const originalJsHandler = require.extensions['.js']
+
+  const ignoreDiagnostics = arrify(options.ignoreDiagnostics).concat([
+    6059, // "'rootDir' is expected to contain all source files."
+    18002, // "The 'files' list in config file is empty."
+    18003 // "No inputs were found in config file."
+  ]).map(Number)
+
+  const memoryCache: MemoryCache = {
+    contents: Object.create(null),
+    versions: Object.create(null),
+    outputs: Object.create(null)
+  }
+
+  const ignore = options.skipIgnore ? [] : arrify(
+    options.ignore || '/node_modules/'
+  ).map(str => new RegExp(str))
+
+  // Install source map support and read from memory cache.
+  sourceMapSupport.install({
+    environment: 'node',
+    retrieveFile (path: string) {
+      return memoryCache.outputs[path]
+    }
+  })
+
+  // Require the TypeScript compiler and configuration.
+  const cwd = process.cwd()
+  const { compilerOptions, project, skipProject } = options
+  const compiler = options.compiler || 'typescript'
+  const typeCheck = options.typeCheck === true || options.transpileOnly !== true
+  const ts: typeof _ts = require(compiler)
+  const transformers = options.transformers || undefined
+  const readFile = options.readFile || ts.sys.readFile
+  const fileExists = options.fileExists || ts.sys.fileExists
+  const config = readConfig(cwd, ts, fileExists, readFile, compilerOptions, project, skipProject)
+  const configDiagnosticList = filterDiagnostics(config.errors, ignoreDiagnostics)
+  const extensions = ['.ts', '.tsx']
+  const fileNames = options.files ? config.fileNames : []
+
+  const cachedir = join(
+    resolve(cwd, cacheDirectory),
+    getCompilerDigest({
+      version: ts.version,
+      options: config.options,
+      fileNames,
+      typeCheck,
+      ignoreDiagnostics,
+      compiler
+    })
+  )
+
+  const diagnosticHost: _ts.FormatDiagnosticsHost = {
+    getNewLine: () => EOL,
+    getCurrentDirectory: () => cwd,
+    getCanonicalFileName: (path) => path
+  }
+
+  const formatDiagnostics = options.pretty
+    ? ts.formatDiagnosticsWithColorAndContext
+    : ts.formatDiagnostics
+
+  function createTSError (diagnostics: ReadonlyArray<_ts.Diagnostic>) {
+    const diagnosticText = formatDiagnostics(diagnostics, diagnosticHost)
+    const diagnosticCodes = diagnostics.map(x => x.code)
+    return new TSError(diagnosticText, diagnosticCodes)
+  }
+
+  // Render the configuration errors and exit the script.
+  if (configDiagnosticList.length) throw createTSError(configDiagnosticList)
+
+  // Enable `allowJs` when flag is set.
+  if (config.options.allowJs) {
+    extensions.push('.js')
+    extensions.push('.jsx')
+  }
+
+  // Initialize files from TypeScript into project.
+  for (const path of fileNames) memoryCache.versions[path] = 1
+
+  /**
+   * Get the extension for a transpiled file.
+   */
+  const getExtension = config.options.jsx === ts.JsxEmit.Preserve ?
+    ((path: string) => /\.[tj]sx$/.test(path) ? '.jsx' : '.js') :
+    ((_: string) => '.js')
+
+  /**
+   * Create the basic required function using transpile mode.
+   */
+  let getOutput = function (code: string, fileName: string, lineOffset = 0): SourceOutput {
+    const result = ts.transpileModule(code, {
+      fileName,
+      transformers,
+      compilerOptions: config.options,
+      reportDiagnostics: true
+    })
+
+    const diagnosticList = result.diagnostics ?
+      filterDiagnostics(result.diagnostics, ignoreDiagnostics) :
+      []
+
+    if (diagnosticList.length) throw createTSError(diagnosticList)
+
+    return [result.outputText, result.sourceMapText as string]
+  }
+
+  let getTypeInfo = function (_code: string, _fileName: string, _position: number): TypeInfo {
+    throw new TypeError(`Type information is unavailable without "--type-check"`)
+  }
+
+  // Use full language services when the fast option is disabled.
+  if (typeCheck) {
+    // Set the file contents into cache.
+    const updateMemoryCache = function (code: string, fileName: string) {
+      if (memoryCache.contents[fileName] !== code) {
+        memoryCache.contents[fileName] = code
+        memoryCache.versions[fileName] = (memoryCache.versions[fileName] || 0) + 1
+      }
+    }
+
+    // Create the compiler host for type checking.
+    const serviceHost = {
+      getScriptFileNames: () => Object.keys(memoryCache.versions),
+      getScriptVersion: (fileName: string) => {
+        const version = memoryCache.versions[fileName]
+
+        // We need to return `undefined` and not a string here because TypeScript will use
+        // `getScriptVersion` and compare against their own version - which can be `undefined`.
+        // If we don't return `undefined` it results in `undefined === "undefined"` and run
+        // `createProgram` again (which is very slow). Using a `string` assertion here to avoid
+        // TypeScript errors from the function signature (expects `(x: string) => string`).
+        return version === undefined ? undefined as any as string : String(version)
+      },
+      getScriptSnapshot (fileName: string) {
+        // Read contents into TypeScript memory cache.
+        if (!Object.prototype.hasOwnProperty.call(memoryCache.contents, fileName)) {
+          memoryCache.contents[fileName] = readFile(fileName)
+        }
+
+        const contents = memoryCache.contents[fileName]
+        if (contents === undefined) return
+        return ts.ScriptSnapshot.fromString(contents)
+      },
+      fileExists: debugFn('fileExists', fileExists),
+      readFile: debugFn('readFile', readFile),
+      readDirectory: debugFn('readDirectory', ts.sys.readDirectory),
+      getDirectories: debugFn('getDirectories', ts.sys.getDirectories),
+      directoryExists: debugFn('directoryExists', ts.sys.directoryExists),
+      getNewLine: () => EOL,
+      getCurrentDirectory: () => cwd,
+      getCompilationSettings: () => config.options,
+      getDefaultLibFileName: () => ts.getDefaultLibFilePath(config.options),
+      getCustomTransformers: () => transformers
+    }
+
+    const service = ts.createLanguageService(serviceHost)
+
+    getOutput = function (code: string, fileName: string, lineOffset: number = 0) {
+      // Must set memory cache before attempting to read file.
+      updateMemoryCache(code, fileName)
+
+      const output = service.getEmitOutput(fileName)
+
+      // Get the relevant diagnostics - this is 3x faster than `getPreEmitDiagnostics`.
+      const diagnostics = service.getCompilerOptionsDiagnostics()
+        .concat(service.getSyntacticDiagnostics(fileName))
+        .concat(service.getSemanticDiagnostics(fileName))
+
+      const diagnosticList = filterDiagnostics(diagnostics, ignoreDiagnostics)
+
+      if (diagnosticList.length) throw createTSError(diagnosticList)
+
+      if (output.emitSkipped) {
+        throw new TypeError(`${relative(cwd, fileName)}: Emit skipped`)
+      }
+
+      // Throw an error when requiring `.d.ts` files.
+      if (output.outputFiles.length === 0) {
+        return ['', ''];
+      }
+      return [output.outputFiles[1].text, output.outputFiles[0].text]
+    }
+
+    getTypeInfo = function (code: string, fileName: string, position: number) {
+      updateMemoryCache(code, fileName)
+
+      const info = service.getQuickInfoAtPosition(fileName, position)
+      const name = ts.displayPartsToString(info ? info.displayParts : [])
+      const comment = ts.displayPartsToString(info ? info.documentation : [])
+
+      return { name, comment }
+    }
+  }
+
+  const compile = readThrough(cachedir, options.cache === true, memoryCache, getOutput, getExtension)
+  const register: Register = { cwd, compile, getTypeInfo, extensions, cachedir, ts }
+
+  // Register the extensions.
+  extensions.forEach(extension => {
+    registerExtension(extension, ignore, register, originalJsHandler)
+  })
+
+  return register
+}
+
+/**
+ * Check if the filename should be ignored.
+ */
+function shouldIgnore (filename: string, ignore: RegExp[]) {
+  const relname = normalizeSlashes(filename)
+
+  return ignore.some(x => x.test(relname))
+}
+
+/**
+ * Register the extension for node.
+ */
+function registerExtension (
+  ext: string,
+  ignore: RegExp[],
+  register: Register,
+  originalHandler: (m: NodeModule, filename: string) => any
+) {
+  const old = require.extensions[ext] || originalHandler
+
+  require.extensions[ext] = function (m: any, filename) {
+    if (shouldIgnore(filename, ignore)) {
+      return old(m, filename)
+    }
+
+    const _compile = m._compile
+
+    m._compile = function (code: string, fileName: string) {
+      debug('module._compile', fileName)
+
+      return _compile.call(this, register.compile(code, fileName), fileName)
+    }
+
+    return old(m, filename)
+  }
+}
+
+/**
+ * Do post-processing on config options to support `ts-node`.
+ */
+function fixConfig (ts: TSCommon, config: _ts.ParsedCommandLine) {
+  // Delete options that *should not* be passed through.
+  delete config.options.out
+  delete config.options.outFile
+  delete config.options.declarationDir
+  delete config.options.declarationMap
+  delete config.options.emitDeclarationOnly
+
+  // Target ES5 output by default (instead of ES3).
+  if (config.options.target === undefined) {
+    config.options.target = ts.ScriptTarget.ES5
+  }
+
+  // Target CommonJS modules by default (instead of magically switching to ES6 when the target is ES6).
+  if (config.options.module === undefined) {
+    config.options.module = ts.ModuleKind.CommonJS
+  }
+
+  return config
+}
+
+/**
+ * Load TypeScript configuration.
+ */
+function readConfig (
+  cwd: string,
+  ts: TSCommon,
+  fileExists: (path: string) => boolean,
+  readFile: (path: string) => string | undefined,
+  compilerOptions?: object,
+  project?: string | null,
+  noProject?: boolean | null
+): _ts.ParsedCommandLine {
+  let config = { compilerOptions: {} }
+  let basePath = normalizeSlashes(cwd)
+  let configFileName: string | undefined = undefined
+
+  // Read project configuration when available.
+  if (!noProject) {
+    configFileName = project
+      ? normalizeSlashes(resolve(cwd, project))
+      : ts.findConfigFile(normalizeSlashes(cwd), fileExists)
+
+    if (configFileName) {
+      const result = ts.readConfigFile(configFileName, readFile)
+
+      // Return diagnostics.
+      if (result.error) {
+        return { errors: [result.error], fileNames: [], options: {} }
+      }
+
+      config = result.config
+      basePath = normalizeSlashes(dirname(configFileName))
+    }
+  }
+
+  // Override default configuration options `ts-node` requires.
+  config.compilerOptions = Object.assign({}, config.compilerOptions, compilerOptions, DEFAULT_COMPILER_OPTIONS)
+
+  return fixConfig(ts, ts.parseJsonConfigFileContent(config, ts.sys, basePath, undefined, configFileName))
+}
+
+/**
+ * Internal source output.
+ */
+type SourceOutput = [string, string]
+
+/**
+ * Wrap the function with caching.
+ */
+function readThrough (
+  cachedir: string,
+  shouldCache: boolean,
+  memoryCache: MemoryCache,
+  compile: (code: string, fileName: string, lineOffset?: number) => SourceOutput,
+  getExtension: (fileName: string) => string
+) {
+  if (shouldCache === false) {
+    return function (code: string, fileName: string, lineOffset?: number) {
+      debug('readThrough', fileName)
+
+      const [value, sourceMap] = compile(code, fileName, lineOffset)
+      const output = updateOutput(value, fileName, sourceMap, getExtension)
+
+      memoryCache.outputs[fileName] = output
+
+      return output
+    }
+  }
+
+  // Make sure the cache directory exists before continuing.
+  mkdirp.sync(cachedir)
+
+  return function (code: string, fileName: string, lineOffset?: number) {
+    debug('readThrough', fileName)
+
+    const cachePath = join(cachedir, getCacheName(code, fileName))
+    const extension = getExtension(fileName)
+    const outputPath = `${cachePath}${extension}`
+
+    try {
+      const output = readFileSync(outputPath, 'utf8')
+      if (isValidCacheContent(output)) {
+        memoryCache.outputs[fileName] = output
+        return output
+      }
+    } catch (err) {/* Ignore. */}
+
+    const [value, sourceMap] = compile(code, fileName, lineOffset)
+    const output = updateOutput(value, fileName, sourceMap, getExtension)
+
+    memoryCache.outputs[fileName] = output
+    writeFileSync(outputPath, output)
+
+    return output
+  }
+}
+
+/**
+ * Update the output remapping the source map.
+ */
+function updateOutput (outputText: string, fileName: string, sourceMap: string, getExtension: (fileName: string) => string) {
+  const base64Map = bufferFrom(updateSourceMap(sourceMap, fileName), 'utf8').toString('base64')
+  const sourceMapContent = `data:application/json;charset=utf-8;base64,${base64Map}`
+  const sourceMapLength = `${basename(fileName)}.map`.length + (getExtension(fileName).length - extname(fileName).length)
+
+  return outputText.slice(0, -sourceMapLength) + sourceMapContent
+}
+
+/**
+ * Update the source map contents for improved output.
+ */
+function updateSourceMap (sourceMapText: string, fileName: string) {
+  const sourceMap = JSON.parse(sourceMapText)
+  sourceMap.file = fileName
+  sourceMap.sources = [fileName]
+  delete sourceMap.sourceRoot
+  return JSON.stringify(sourceMap)
+}
+
+/**
+ * Get the file name for the cache entry.
+ */
+function getCacheName (sourceCode: string, fileName: string) {
+  return crypto.createHash('sha256')
+    .update(extname(fileName), 'utf8')
+    .update('\x00', 'utf8')
+    .update(sourceCode, 'utf8')
+    .digest('hex')
+}
+
+/**
+ * Ensure the given cached content is valid by sniffing for a base64 encoded '}'
+ * at the end of the content, which should exist if there is a valid sourceMap present.
+ */
+function isValidCacheContent (contents: string) {
+  return /(?:9|0=|Q==)$/.test(contents.slice(-3))
+}
+
+/**
+ * Create a hash of the current configuration.
+ */
+function getCompilerDigest (obj: object) {
+  return crypto.createHash('sha256').update(JSON.stringify(obj), 'utf8').digest('hex')
+}
+
+/**
+ * Filter diagnostics.
+ */
+function filterDiagnostics (diagnostics: _ts.Diagnostic[], ignore: number[]) {
+  return diagnostics.filter(x => ignore.indexOf(x.code) === -1)
+}