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index.ts
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import { relative, basename, extname, dirname, join } from 'path';
import { Module } from 'module';
import * as util from 'util';
import { fileURLToPath } from 'url';
import type * as _sourceMapSupport from '@cspotcode/source-map-support';
import { BaseError } from 'make-error';
import type * as _ts from 'typescript';
import type { Transpiler, TranspilerFactory } from './transpilers/types';
import {
cachedLookup,
createProjectLocalResolveHelper,
hasOwnProperty,
normalizeSlashes,
once,
parse,
ProjectLocalResolveHelper,
split,
versionGteLt,
yn,
} from './util';
import { findAndReadConfig, loadCompiler } from './configuration';
import type { TSCommon, TSInternal } from './ts-compiler-types';
import { createModuleTypeClassifier, ModuleTypeClassifier } from './module-type-classifier';
import { createResolverFunctions } from './resolver-functions';
import type { createEsmHooks as createEsmHooksFn } from './esm';
import { installCommonjsResolveHooksIfNecessary, ModuleConstructorWithInternals } from './cjs-resolve-hooks';
import { classifyModule } from './node-module-type-classifier';
import type * as _nodeInternalModulesEsmResolve from '../dist-raw/node-internal-modules-esm-resolve';
import type * as _nodeInternalModulesEsmGetFormat from '../dist-raw/node-internal-modules-esm-get_format';
import type * as _nodeInternalModulesCjsLoader from '../dist-raw/node-internal-modules-cjs-loader';
import { Extensions, getExtensions } from './file-extensions';
import { createTsTranspileModule } from './ts-transpile-module';
import { assertScriptCanLoadAsCJS } from '../dist-raw/node-internal-modules-cjs-loader';
export { TSCommon };
export { createRepl, CreateReplOptions, ReplService, EvalAwarePartialHost } from './repl';
export type {
TranspilerModule,
TranspilerFactory,
CreateTranspilerOptions,
TranspileOutput,
TranspileOptions,
Transpiler,
} from './transpilers/types';
export type { NodeLoaderHooksAPI1, NodeLoaderHooksAPI2, NodeLoaderHooksFormat } from './esm';
const engineSupportsPackageTypeField = true;
/**
* Registered `ts-node` instance information.
*/
export const REGISTER_INSTANCE = Symbol.for('ts-node.register.instance');
/**
* Expose `REGISTER_INSTANCE` information on node.js `process`.
*/
declare global {
namespace NodeJS {
interface Process {
[REGISTER_INSTANCE]?: Service;
}
}
}
/** @internal */
export const env = process.env as ProcessEnv;
/**
* Declare all env vars, to aid discoverability.
* If an env var affects ts-node's behavior, it should not be buried somewhere in our codebase.
* @internal
*/
export interface ProcessEnv {
TS_NODE_DEBUG?: string;
TS_NODE_CWD?: string;
/** @deprecated */
TS_NODE_DIR?: string;
TS_NODE_EMIT?: string;
TS_NODE_SCOPE?: string;
TS_NODE_SCOPE_DIR?: string;
TS_NODE_FILES?: string;
TS_NODE_PRETTY?: string;
TS_NODE_COMPILER?: string;
TS_NODE_COMPILER_OPTIONS?: string;
TS_NODE_IGNORE?: string;
TS_NODE_PROJECT?: string;
TS_NODE_SKIP_PROJECT?: string;
TS_NODE_SKIP_IGNORE?: string;
TS_NODE_PREFER_TS_EXTS?: string;
TS_NODE_IGNORE_DIAGNOSTICS?: string;
TS_NODE_TRANSPILE_ONLY?: string;
TS_NODE_TYPE_CHECK?: string;
TS_NODE_COMPILER_HOST?: string;
TS_NODE_LOG_ERROR?: string;
TS_NODE_HISTORY?: string;
TS_NODE_EXPERIMENTAL_REPL_AWAIT?: string;
NODE_NO_READLINE?: string;
}
/**
* @internal
*/
export const INSPECT_CUSTOM = util.inspect.custom || 'inspect';
/**
* Debugging `ts-node`.
*/
const shouldDebug = yn(env.TS_NODE_DEBUG);
/** @internal */
export const debug = shouldDebug
? (...args: any) => console.log(`[ts-node ${new Date().toISOString()}]`, ...args)
: () => undefined;
const debugFn = shouldDebug
? <T, U>(key: string, fn: (arg: T) => U) => {
let i = 0;
return (x: T) => {
debug(key, x, ++i);
return fn(x);
};
}
: <T, U>(_: string, fn: (arg: T) => U) => fn;
/**
* Export the current version.
*/
export const VERSION = require('../package.json').version;
/**
* Options for creating a new TypeScript compiler instance.
* @category Basic
*/
export interface CreateOptions {
/**
* Behave as if invoked within this working directory. Roughly equivalent to `cd $dir && ts-node ...`
*
* @default process.cwd()
*/
cwd?: string;
/**
* Legacy alias for `cwd`
*
* @deprecated use `projectSearchDir` or `cwd`
*/
dir?: string;
/**
* Emit output files into `.ts-node` directory.
*
* @default false
*/
emit?: boolean;
/**
* Scope compiler to files within `scopeDir`.
*
* @default false
*/
scope?: boolean;
/**
* @default First of: `tsconfig.json` "rootDir" if specified, directory containing `tsconfig.json`, or cwd if no `tsconfig.json` is loaded.
*/
scopeDir?: string;
/**
* Use pretty diagnostic formatter.
*
* @default false
*/
pretty?: boolean;
/**
* Use TypeScript's faster `transpileModule`.
*
* @default false
*/
transpileOnly?: boolean;
/**
* **DEPRECATED** Specify type-check is enabled (e.g. `transpileOnly == false`).
*
* @default true
*/
typeCheck?: boolean;
/**
* Use TypeScript's compiler host API instead of the language service API.
*
* @default false
*/
compilerHost?: boolean;
/**
* Logs TypeScript errors to stderr instead of throwing exceptions.
*
* @default false
*/
logError?: boolean;
/**
* Load "files" and "include" from `tsconfig.json` on startup.
*
* Default is to override `tsconfig.json` "files" and "include" to only include the entrypoint script.
*
* @default false
*/
files?: boolean;
/**
* Specify a custom TypeScript compiler.
*
* @default "typescript"
*/
compiler?: string;
/**
* Specify a custom transpiler for use with transpileOnly
*/
transpiler?: string | [string, object];
/**
* Transpile with swc instead of the TypeScript compiler, and skip typechecking.
*
* Equivalent to setting both `transpileOnly: true` and `transpiler: 'ts-node/transpilers/swc'`
*
* For complete instructions: https://typestrong.org/ts-node/docs/transpilers
*/
swc?: boolean;
/**
* Paths which should not be compiled.
*
* Each string in the array is converted to a regular expression via `new RegExp()` and tested against source paths prior to compilation.
*
* Source paths are normalized to posix-style separators, relative to the directory containing `tsconfig.json` or to cwd if no `tsconfig.json` is loaded.
*
* Default is to ignore all node_modules subdirectories.
*
* @default ["(?:^|/)node_modules/"]
*/
ignore?: string[];
/**
* Path to TypeScript config file or directory containing a `tsconfig.json`.
* Similar to the `tsc --project` flag: https://www.typescriptlang.org/docs/handbook/compiler-options.html
*/
project?: string;
/**
* Search for TypeScript config file (`tsconfig.json`) in this or parent directories.
*/
projectSearchDir?: string;
/**
* Skip project config resolution and loading.
*
* @default false
*/
skipProject?: boolean;
/**
* Skip ignore check, so that compilation will be attempted for all files with matching extensions.
*
* @default false
*/
skipIgnore?: boolean;
/**
* JSON object to merge with TypeScript `compilerOptions`.
*
* @allOf [{"$ref": "https://schemastore.azurewebsites.net/schemas/json/tsconfig.json#definitions/compilerOptionsDefinition/properties/compilerOptions"}]
*/
compilerOptions?: object;
/**
* Ignore TypeScript warnings by diagnostic code.
*/
ignoreDiagnostics?: Array<number | string>;
/**
* Modules to require, like node's `--require` flag.
*
* If specified in `tsconfig.json`, the modules will be resolved relative to the `tsconfig.json` file.
*
* If specified programmatically, each input string should be pre-resolved to an absolute path for
* best results.
*/
require?: Array<string>;
readFile?: (path: string) => string | undefined;
fileExists?: (path: string) => boolean;
transformers?: _ts.CustomTransformers | ((p: _ts.Program) => _ts.CustomTransformers);
/**
* Allows the usage of top level await in REPL.
*
* Uses node's implementation which accomplishes this with an AST syntax transformation.
*
* Enabled by default when tsconfig target is es2018 or above. Set to false to disable.
*
* **Note**: setting to `true` when tsconfig target is too low will throw an Error. Leave as `undefined`
* to get default, automatic behavior.
*/
experimentalReplAwait?: boolean;
/**
* Override certain paths to be compiled and executed as CommonJS or ECMAScript modules.
* When overridden, the tsconfig "module" and package.json "type" fields are overridden, and
* the file extension is ignored.
* This is useful if you cannot use .mts, .cts, .mjs, or .cjs file extensions;
* it achieves the same effect.
*
* Each key is a glob pattern following the same rules as tsconfig's "include" array.
* When multiple patterns match the same file, the last pattern takes precedence.
*
* `cjs` overrides matches files to compile and execute as CommonJS.
* `esm` overrides matches files to compile and execute as native ECMAScript modules.
* `package` overrides either of the above to default behavior, which obeys package.json "type" and
* tsconfig.json "module" options.
*/
moduleTypes?: ModuleTypes;
/**
* @internal
* Set by our configuration loader whenever a config file contains options that
* are relative to the config file they came from, *and* when other logic needs
* to know this. Some options can be eagerly resolved to absolute paths by
* the configuration loader, so it is *not* necessary for their source to be set here.
*/
optionBasePaths?: OptionBasePaths;
/**
* A function to collect trace messages from the TypeScript compiler, for example when `traceResolution` is enabled.
*
* @default console.log
*/
tsTrace?: (str: string) => void;
/**
* Enable native ESM support.
*
* For details, see https://typestrong.org/ts-node/docs/imports#native-ecmascript-modules
*/
esm?: boolean;
/**
* Re-order file extensions so that TypeScript imports are preferred.
*
* For example, when both `index.js` and `index.ts` exist, enabling this option causes `require('./index')` to resolve to `index.ts` instead of `index.js`
*
* @default false
*/
preferTsExts?: boolean;
/**
* Like node's `--experimental-specifier-resolution`, , but can also be set in your `tsconfig.json` for convenience.
*
* For details, see https://nodejs.org/dist/latest-v18.x/docs/api/esm.html#customizing-esm-specifier-resolution-algorithm
*/
experimentalSpecifierResolution?: 'node' | 'explicit';
/**
* Allow using voluntary `.ts` file extension in import specifiers.
*
* Typically, in ESM projects, import specifiers must have an emit extension, `.js`, `.cjs`, or `.mjs`,
* and we automatically map to the corresponding `.ts`, `.cts`, or `.mts` source file. This is the
* recommended approach.
*
* However, if you really want to use `.ts` in import specifiers, and are aware that this may
* break tooling, you can enable this flag.
*/
experimentalTsImportSpecifiers?: boolean;
}
export type ModuleTypes = Record<string, ModuleTypeOverride>;
export type ModuleTypeOverride = 'cjs' | 'esm' | 'package';
/** @internal */
export interface OptionBasePaths {
moduleTypes?: string;
transpiler?: string;
compiler?: string;
swc?: string;
}
/**
* Options for registering a TypeScript compiler instance globally.
* @category Basic
*/
export interface RegisterOptions extends CreateOptions {
/**
* Enable experimental features that re-map imports and require calls to support:
* `baseUrl`, `paths`, `rootDirs`, `.js` to `.ts` file extension mappings,
* `outDir` to `rootDir` mappings for composite projects and monorepos.
*
* For details, see https://github.com/TypeStrong/ts-node/issues/1514
*/
experimentalResolver?: boolean;
}
export type ExperimentalSpecifierResolution = 'node' | 'explicit';
/**
* Must be an interface to support `typescript-json-schema`.
*/
export interface TsConfigOptions
extends Omit<
RegisterOptions,
| 'transformers'
| 'readFile'
| 'fileExists'
| 'skipProject'
| 'project'
| 'dir'
| 'cwd'
| 'projectSearchDir'
| 'optionBasePaths'
| 'tsTrace'
> {}
/**
* Information retrieved from type info check.
*/
export interface TypeInfo {
name: string;
comment: string;
}
/**
* Default register options, including values specified via environment
* variables.
* @internal
*/
export const DEFAULTS: RegisterOptions = {
cwd: env.TS_NODE_CWD ?? env.TS_NODE_DIR,
emit: yn(env.TS_NODE_EMIT),
scope: yn(env.TS_NODE_SCOPE),
scopeDir: env.TS_NODE_SCOPE_DIR,
files: yn(env.TS_NODE_FILES),
pretty: yn(env.TS_NODE_PRETTY),
compiler: env.TS_NODE_COMPILER,
compilerOptions: parse(env.TS_NODE_COMPILER_OPTIONS),
ignore: split(env.TS_NODE_IGNORE),
project: env.TS_NODE_PROJECT,
skipProject: yn(env.TS_NODE_SKIP_PROJECT),
skipIgnore: yn(env.TS_NODE_SKIP_IGNORE),
preferTsExts: yn(env.TS_NODE_PREFER_TS_EXTS),
ignoreDiagnostics: split(env.TS_NODE_IGNORE_DIAGNOSTICS),
transpileOnly: yn(env.TS_NODE_TRANSPILE_ONLY),
typeCheck: yn(env.TS_NODE_TYPE_CHECK),
compilerHost: yn(env.TS_NODE_COMPILER_HOST),
logError: yn(env.TS_NODE_LOG_ERROR),
experimentalReplAwait: yn(env.TS_NODE_EXPERIMENTAL_REPL_AWAIT) ?? undefined,
tsTrace: console.log.bind(console),
};
/**
* TypeScript diagnostics error.
*/
export class TSError extends BaseError {
name = 'TSError';
diagnosticText!: string;
diagnostics!: ReadonlyArray<_ts.Diagnostic>;
constructor(
diagnosticText: string,
public diagnosticCodes: number[],
diagnostics: ReadonlyArray<_ts.Diagnostic> = []
) {
super(`⨯ Unable to compile TypeScript:\n${diagnosticText}`);
Object.defineProperty(this, 'diagnosticText', {
configurable: true,
writable: true,
value: diagnosticText,
});
Object.defineProperty(this, 'diagnostics', {
configurable: true,
writable: true,
value: diagnostics,
});
}
/**
* @internal
*/
[INSPECT_CUSTOM]() {
return this.diagnosticText;
}
}
const TS_NODE_SERVICE_BRAND = Symbol('TS_NODE_SERVICE_BRAND');
/**
* Primary ts-node service, which wraps the TypeScript API and can compile TypeScript to JavaScript
*/
export interface Service {
/** @internal */
[TS_NODE_SERVICE_BRAND]: true;
ts: TSCommon;
/** @internal */
compilerPath: string;
config: _ts.ParsedCommandLine;
options: RegisterOptions;
enabled(enabled?: boolean): boolean;
ignored(fileName: string): boolean;
compile(code: string, fileName: string, lineOffset?: number): string;
getTypeInfo(code: string, fileName: string, position: number): TypeInfo;
/** @internal */
configFilePath: string | undefined;
/** @internal */
moduleTypeClassifier: ModuleTypeClassifier;
/** @internal */
readonly shouldReplAwait: boolean;
/** @internal */
addDiagnosticFilter(filter: DiagnosticFilter): void;
/** @internal */
installSourceMapSupport(): void;
/** @internal */
transpileOnly: boolean;
/** @internal */
projectLocalResolveHelper: ProjectLocalResolveHelper;
/** @internal */
getNodeEsmResolver: () => ReturnType<typeof import('../dist-raw/node-internal-modules-esm-resolve').createResolve>;
/** @internal */
getNodeEsmGetFormat: () => ReturnType<
typeof import('../dist-raw/node-internal-modules-esm-get_format').createGetFormat
>;
/** @internal */
getNodeCjsLoader: () => ReturnType<typeof import('../dist-raw/node-internal-modules-cjs-loader').createCjsLoader>;
/** @internal */
extensions: Extensions;
}
/**
* Re-export of `Service` interface for backwards-compatibility
* @deprecated use `Service` instead
* @see {Service}
*/
export type Register = Service;
/** @internal */
export interface DiagnosticFilter {
/** if true, filter applies to all files */
appliesToAllFiles: boolean;
/** Filter applies onto to these filenames. Only used if appliesToAllFiles is false */
filenamesAbsolute: string[];
/** these diagnostic codes are ignored */
diagnosticsIgnored: number[];
}
/**
* Create a new TypeScript compiler instance and register it onto node.js
*
* @category Basic
*/
export function register(opts?: RegisterOptions): Service;
/**
* Register TypeScript compiler instance onto node.js
* @category Basic
*/
export function register(service: Service): Service;
export function register(serviceOrOpts: Service | RegisterOptions | undefined): Service {
// Is this a Service or a RegisterOptions?
let service = serviceOrOpts as Service;
if (!(serviceOrOpts as Service)?.[TS_NODE_SERVICE_BRAND]) {
// Not a service; is options
service = create((serviceOrOpts ?? {}) as RegisterOptions);
}
const originalJsHandler = require.extensions['.js'];
// Expose registered instance globally.
process[REGISTER_INSTANCE] = service;
// Register the extensions.
registerExtensions(service.options.preferTsExts, service.extensions.compiled, service, originalJsHandler);
installCommonjsResolveHooksIfNecessary(service);
service.installSourceMapSupport();
// Require specified modules before start-up.
(Module as ModuleConstructorWithInternals)._preloadModules(service.options.require);
return service;
}
/**
* Create TypeScript compiler instance.
*
* @category Basic
*/
export function create(rawOptions: CreateOptions = {}): Service {
const foundConfigResult = findAndReadConfig(rawOptions);
return createFromPreloadedConfig(foundConfigResult);
}
/** @internal */
export function createFromPreloadedConfig(foundConfigResult: ReturnType<typeof findAndReadConfig>): Service {
const { configFilePath, cwd, options, config, compiler, projectLocalResolveDir, optionBasePaths } = foundConfigResult;
const projectLocalResolveHelper = createProjectLocalResolveHelper(projectLocalResolveDir);
const ts = loadCompiler(compiler);
// Experimental REPL await is not compatible targets lower than ES2018
const targetSupportsTla = config.options.target! >= ts.ScriptTarget.ES2018;
if (options.experimentalReplAwait === true && !targetSupportsTla) {
throw new Error('Experimental REPL await is not compatible with targets lower than ES2018');
}
const shouldReplAwait = options.experimentalReplAwait !== false && targetSupportsTla;
// swc implies two other options
// typeCheck option was implemented specifically to allow overriding tsconfig transpileOnly from the command-line
// So we should allow using typeCheck to override swc
if (options.swc && !options.typeCheck) {
if (options.transpileOnly === false) {
throw new Error("Cannot enable 'swc' option with 'transpileOnly: false'. 'swc' implies 'transpileOnly'.");
}
if (options.transpiler) {
throw new Error("Cannot specify both 'swc' and 'transpiler' options. 'swc' uses the built-in swc transpiler.");
}
}
const readFile = options.readFile || ts.sys.readFile;
const fileExists = options.fileExists || ts.sys.fileExists;
// typeCheck can override transpileOnly, useful for CLI flag to override config file
const transpileOnly = (options.transpileOnly === true || options.swc === true) && options.typeCheck !== true;
let transpiler: RegisterOptions['transpiler'] | undefined = undefined;
let transpilerBasePath: string | undefined = undefined;
if (options.transpiler) {
transpiler = options.transpiler;
transpilerBasePath = optionBasePaths.transpiler;
} else if (options.swc) {
transpiler = require.resolve('./transpilers/swc.js');
transpilerBasePath = optionBasePaths.swc;
}
const transformers = options.transformers || undefined;
const diagnosticFilters: Array<DiagnosticFilter> = [
{
appliesToAllFiles: true,
filenamesAbsolute: [],
diagnosticsIgnored: [
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."
...(options.experimentalTsImportSpecifiers
? [
2691, // "An import path cannot end with a '.ts' extension. Consider importing '<specifier without ext>' instead."
]
: []),
...(options.ignoreDiagnostics || []),
].map(Number),
},
];
const configDiagnosticList = filterDiagnostics(config.errors, diagnosticFilters);
const outputCache = new Map<
string,
{
content: string;
}
>();
const configFileDirname = configFilePath ? dirname(configFilePath) : null;
const scopeDir = options.scopeDir ?? config.options.rootDir ?? configFileDirname ?? cwd;
const ignoreBaseDir = configFileDirname ?? cwd;
const isScoped = options.scope ? (fileName: string) => relative(scopeDir, fileName).charAt(0) !== '.' : () => true;
const shouldIgnore = createIgnore(
ignoreBaseDir,
options.skipIgnore ? [] : (options.ignore || ['(?:^|/)node_modules/']).map((str) => new RegExp(str))
);
const diagnosticHost: _ts.FormatDiagnosticsHost = {
getNewLine: () => ts.sys.newLine,
getCurrentDirectory: () => cwd,
// TODO switch to getCanonicalFileName we already create later in scope
getCanonicalFileName: ts.sys.useCaseSensitiveFileNames ? (x) => x : (x) => x.toLowerCase(),
};
if (options.transpileOnly && typeof transformers === 'function') {
throw new TypeError('Transformers function is unavailable in "--transpile-only"');
}
let createTranspiler = initializeTranspilerFactory();
function initializeTranspilerFactory() {
if (transpiler) {
if (!transpileOnly) throw new Error('Custom transpiler can only be used when transpileOnly is enabled.');
const transpilerName = typeof transpiler === 'string' ? transpiler : transpiler[0];
const transpilerOptions = typeof transpiler === 'string' ? {} : transpiler[1] ?? {};
const transpilerConfigLocalResolveHelper = transpilerBasePath
? createProjectLocalResolveHelper(transpilerBasePath)
: projectLocalResolveHelper;
const transpilerPath = transpilerConfigLocalResolveHelper(transpilerName, true);
const transpilerFactory = require(transpilerPath).create as TranspilerFactory;
return createTranspiler;
function createTranspiler(compilerOptions: TSCommon.CompilerOptions, nodeModuleEmitKind?: NodeModuleEmitKind) {
return transpilerFactory?.({
service: {
options,
config: {
...config,
options: compilerOptions,
},
projectLocalResolveHelper,
},
transpilerConfigLocalResolveHelper,
nodeModuleEmitKind,
...transpilerOptions,
});
}
}
}
// Install source map support and read from memory cache.
function installSourceMapSupport() {
const sourceMapSupport = require('@cspotcode/source-map-support') as typeof _sourceMapSupport;
sourceMapSupport.install({
environment: 'node',
retrieveFile(pathOrUrl: string) {
let path = pathOrUrl;
// If it's a file URL, convert to local path
// I could not find a way to handle non-URLs except to swallow an error
if (path.startsWith('file://')) {
try {
path = fileURLToPath(path);
} catch (e) {
/* swallow error */
}
}
path = normalizeSlashes(path);
return outputCache.get(path)?.content || '';
},
redirectConflictingLibrary: true,
onConflictingLibraryRedirect(request, parent, isMain, options, redirectedRequest) {
debug(
`Redirected an attempt to require source-map-support to instead receive @cspotcode/source-map-support. "${
(parent as NodeJS.Module).filename
}" attempted to require or resolve "${request}" and was redirected to "${redirectedRequest}".`
);
},
});
}
const shouldHavePrettyErrors = options.pretty === undefined ? process.stdout.isTTY : options.pretty;
const formatDiagnostics = shouldHavePrettyErrors
? ts.formatDiagnosticsWithColorAndContext || ts.formatDiagnostics
: 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, diagnostics);
}
function reportTSError(configDiagnosticList: _ts.Diagnostic[]) {
const error = createTSError(configDiagnosticList);
if (options.logError) {
// Print error in red color and continue execution.
console.error('\x1b[31m%s\x1b[0m', error);
} else {
// Throw error and exit the script.
throw error;
}
}
// Render the configuration errors.
if (configDiagnosticList.length) reportTSError(configDiagnosticList);
const jsxEmitPreserve = config.options.jsx === ts.JsxEmit.Preserve;
/**
* Get the extension for a transpiled file.
* [MUST_UPDATE_FOR_NEW_FILE_EXTENSIONS]
*/
function getEmitExtension(path: string) {
const lastDotIndex = path.lastIndexOf('.');
if (lastDotIndex >= 0) {
const ext = path.slice(lastDotIndex);
switch (ext) {
case '.js':
case '.ts':
return '.js';
case '.jsx':
case '.tsx':
return jsxEmitPreserve ? '.jsx' : '.js';
case '.mjs':
case '.mts':
return '.mjs';
case '.cjs':
case '.cts':
return '.cjs';
}
}
return '.js';
}
type GetOutputFunction = (code: string, fileName: string) => SourceOutput;
/**
* Get output from TS compiler w/typechecking. `undefined` in `transpileOnly`
* mode.
*/
let getOutput: GetOutputFunction | undefined;
let getTypeInfo: (_code: string, _fileName: string, _position: number) => TypeInfo;
const getCanonicalFileName = (ts as unknown as TSInternal).createGetCanonicalFileName(
ts.sys.useCaseSensitiveFileNames
);
const moduleTypeClassifier = createModuleTypeClassifier({
basePath: options.optionBasePaths?.moduleTypes,
patterns: options.moduleTypes,
});
const extensions = getExtensions(config, options, ts.version);
// Use full language services when the fast option is disabled.
if (!transpileOnly) {
const fileContents = new Map<string, string>();
const rootFileNames = new Set(config.fileNames);
const cachedReadFile = cachedLookup(debugFn('readFile', readFile));
// Use language services by default
if (!options.compilerHost) {
let projectVersion = 1;
const fileVersions = new Map(Array.from(rootFileNames).map((fileName) => [fileName, 0]));
const getCustomTransformers = () => {
if (typeof transformers === 'function') {
const program = service.getProgram();
return program ? transformers(program) : undefined;
}
return transformers;
};
// Create the compiler host for type checking.
const serviceHost: _ts.LanguageServiceHost & Required<Pick<_ts.LanguageServiceHost, 'fileExists' | 'readFile'>> =
{
getProjectVersion: () => String(projectVersion),
getScriptFileNames: () => Array.from(rootFileNames),
getScriptVersion: (fileName: string) => {
const version = fileVersions.get(fileName);
return version ? version.toString() : '';
},
getScriptSnapshot(fileName: string) {
// TODO ordering of this with getScriptVersion? Should they sync up?
let contents = fileContents.get(fileName);
// Read contents into TypeScript memory cache.
if (contents === undefined) {
contents = cachedReadFile(fileName);
if (contents === undefined) return;
fileVersions.set(fileName, 1);
fileContents.set(fileName, contents);
projectVersion++;
}
return ts.ScriptSnapshot.fromString(contents);
},
readFile: cachedReadFile,
readDirectory: ts.sys.readDirectory,
getDirectories: cachedLookup(debugFn('getDirectories', ts.sys.getDirectories)),
fileExists: cachedLookup(debugFn('fileExists', fileExists)),
directoryExists: cachedLookup(debugFn('directoryExists', ts.sys.directoryExists)),
realpath: ts.sys.realpath ? cachedLookup(debugFn('realpath', ts.sys.realpath)) : undefined,
getNewLine: () => ts.sys.newLine,
useCaseSensitiveFileNames: () => ts.sys.useCaseSensitiveFileNames,
getCurrentDirectory: () => cwd,
getCompilationSettings: () => config.options,
getDefaultLibFileName: () => ts.getDefaultLibFilePath(config.options),
getCustomTransformers: getCustomTransformers,
trace: options.tsTrace,
};
const {
resolveModuleNames,
getResolvedModuleWithFailedLookupLocationsFromCache,
resolveTypeReferenceDirectives,
isFileKnownToBeInternal,
markBucketOfFilenameInternal,
} = createResolverFunctions({
host: serviceHost,
getCanonicalFileName,
ts,
cwd,
config,
projectLocalResolveHelper,
options,
extensions,
});
serviceHost.resolveModuleNames = resolveModuleNames;
serviceHost.getResolvedModuleWithFailedLookupLocationsFromCache =
getResolvedModuleWithFailedLookupLocationsFromCache;
serviceHost.resolveTypeReferenceDirectives = resolveTypeReferenceDirectives;
const registry = ts.createDocumentRegistry(ts.sys.useCaseSensitiveFileNames, cwd);
const service = ts.createLanguageService(serviceHost, registry);
const updateMemoryCache = (contents: string, fileName: string) => {
// Add to `rootFiles` as necessary, either to make TS include a file it has not seen,
// or to trigger a re-classification of files from external to internal.
if (!rootFileNames.has(fileName) && !isFileKnownToBeInternal(fileName)) {
markBucketOfFilenameInternal(fileName);
rootFileNames.add(fileName);
// Increment project version for every change to rootFileNames.
projectVersion++;
}
const previousVersion = fileVersions.get(fileName) || 0;
const previousContents = fileContents.get(fileName);
// Avoid incrementing cache when nothing has changed.
if (contents !== previousContents) {
fileVersions.set(fileName, previousVersion + 1);
fileContents.set(fileName, contents);
// Increment project version for every file change.
projectVersion++;
}
};
let previousProgram: _ts.Program | undefined = undefined;
getOutput = (code: string, fileName: string) => {
updateMemoryCache(code, fileName);
const programBefore = service.getProgram();
if (programBefore !== previousProgram) {
debug(`compiler rebuilt Program instance when getting output for ${fileName}`);
}
const output = service.getEmitOutput(fileName);
// Get the relevant diagnostics - this is 3x faster than `getPreEmitDiagnostics`.
const diagnostics = service.getSemanticDiagnostics(fileName).concat(service.getSyntacticDiagnostics(fileName));
const programAfter = service.getProgram();
debug(
'invariant: Is service.getProject() identical before and after getting emit output and diagnostics? (should always be true) ',
programBefore === programAfter
);
previousProgram = programAfter;
const diagnosticList = filterDiagnostics(diagnostics, diagnosticFilters);
if (diagnosticList.length) reportTSError(diagnosticList);
if (output.emitSkipped) {
return [undefined, undefined, true];
}
// Throw an error when requiring `.d.ts` files.
if (output.outputFiles.length === 0) {
throw new TypeError(
`Unable to require file: ${relative(cwd, fileName)}\n` +
'This is usually the result of a faulty configuration or import. ' +
'Make sure there is a `.js`, `.json` or other executable extension with ' +
'loader attached before `ts-node` available.'
);
}
return [output.outputFiles[1].text, output.outputFiles[0].text, false];
};
getTypeInfo = (code: string, fileName: string, position: number) => {
const normalizedFileName = normalizeSlashes(fileName);
updateMemoryCache(code, normalizedFileName);
const info = service.getQuickInfoAtPosition(normalizedFileName, position);
const name = ts.displayPartsToString(info ? info.displayParts : []);
const comment = ts.displayPartsToString(info ? info.documentation : []);
return { name, comment };
};
} else {
const sys: _ts.System & _ts.FormatDiagnosticsHost = {
...ts.sys,
...diagnosticHost,
readFile: (fileName: string) => {
const cacheContents = fileContents.get(fileName);
if (cacheContents !== undefined) return cacheContents;
const contents = cachedReadFile(fileName);
if (contents) fileContents.set(fileName, contents);
return contents;
},
readDirectory: ts.sys.readDirectory,
getDirectories: cachedLookup(debugFn('getDirectories', ts.sys.getDirectories)),
fileExists: cachedLookup(debugFn('fileExists', fileExists)),
directoryExists: cachedLookup(debugFn('directoryExists', ts.sys.directoryExists)),
resolvePath: cachedLookup(debugFn('resolvePath', ts.sys.resolvePath)),
realpath: ts.sys.realpath ? cachedLookup(debugFn('realpath', ts.sys.realpath)) : undefined,
};
const host: _ts.CompilerHost = ts.createIncrementalCompilerHost(config.options, sys);
host.trace = options.tsTrace;
const {
resolveModuleNames,
resolveTypeReferenceDirectives,
isFileKnownToBeInternal,
markBucketOfFilenameInternal,
} = createResolverFunctions({
host,
cwd,
config,
ts,
getCanonicalFileName,
projectLocalResolveHelper,
options,
extensions,
});
host.resolveModuleNames = resolveModuleNames;
host.resolveTypeReferenceDirectives = resolveTypeReferenceDirectives;
let builderProgram = ts.createIncrementalProgram({
rootNames: Array.from(rootFileNames),
options: config.options,
host,
configFileParsingDiagnostics: config.errors,
projectReferences: config.projectReferences,
});
// Read and cache custom transformers.
const customTransformers =