typescript-eslint · bradzacher · Jan 13, 2020 · Jan 8, 2020 · Jan 8, 2020 · Jan 8, 2020
diff --git a/package.json b/package.json
@@ -22,7 +22,7 @@
     "cz": "git-cz",
     "check:docs": "lerna run check:docs",
     "check:configs": "lerna run check:configs",
-    "check:spelling": "cspell --config=.cspell.json **/*.{md,ts,js}",
+    "check:spelling": "cspell --config=.cspell.json \"**/*.{md,ts,js}\"",
     "generate-contributors": "yarn ts-node --transpile-only ./tools/generate-contributors.ts && yarn all-contributors generate",
     "format": "prettier --write \"./**/*.{ts,js,json,md}\"",
     "format-check": "prettier --list-different \"./**/*.{ts,js,json,md}\"",

diff --git a/packages/experimental-utils/src/ts-eslint/ParserOptions.ts b/packages/experimental-utils/src/ts-eslint/ParserOptions.ts
@@ -1,3 +1,5 @@
+import { TSESTreeOptions } from '@typescript-eslint/typescript-estree';
+
 export interface ParserOptions {
   comment?: boolean;
   ecmaFeatures?: {
@@ -9,6 +11,7 @@ export interface ParserOptions {
   errorOnUnknownASTType?: boolean;
   extraFileExtensions?: string[];
   // ts-estree specific
+  debugLevel?: TSESTreeOptions['debugLevel'];
   filePath?: string;
   loc?: boolean;
   noWatch?: boolean;

diff --git a/packages/typescript-estree/README.md b/packages/typescript-estree/README.md
@@ -29,54 +29,140 @@ yarn add -D @typescript-eslint/typescript-estree
 
 ## API
 
-### parse(code, options)
+### Parsing
 
-Parses the given string of code with the options provided and returns an ESTree-compatible AST. The options object has the following properties:
+#### `parse(code, options)`
 
-```js
-{
-  // attach range information to each node
-  range: false,
+Parses the given string of code with the options provided and returns an ESTree-compatible AST.
 
-  // attach line/column location information to each node
-  loc: false,
+```ts
+interface ParseOptions {
+  /**
+   * create a top-level comments array containing all comments
+   */
+  comment?: boolean;
 
-  // create a top-level tokens array containing all tokens
-  tokens: false,
+  /**
+   * An array of modules to turn explicit debugging on for.
+   * - 'typescript-eslint' is the same as setting the env var `DEBUG=typescript-eslint:*`
+   * - 'eslint' is the same as setting the env var `DEBUG=eslint:*`
+   * - 'typescript' is the same as setting `extendedDiagnostics: true` in your tsconfig compilerOptions
+   *
+   * For convenience, also supports a boolean:
+   * - true === ['typescript-eslint']
+   * - false === []
+   */
+  debugLevel?: boolean | ('typescript-eslint' | 'eslint' | 'typescript')[];
 
-  // create a top-level comments array containing all comments
-  comment: false,
+  /**
+   * Cause the parser to error if it encounters an unknown AST node type (useful for testing).
+   * This case only usually occurs when TypeScript releases new features.
+   */
+  errorOnUnknownASTType?: boolean;
 
-  /*
-   * enable parsing JSX. For more details, see https://www.typescriptlang.org/docs/handbook/jsx.html
+  /**
+   * The absolute path to the file being parsed.
+   */
+  filePath?: string;
+
+  /**
+   * Enable parsing of JSX.
+   * For more details, see https://www.typescriptlang.org/docs/handbook/jsx.html
    *
    * NOTE: this setting does not effect known file types (.js, .jsx, .ts, .tsx, .json) because the
    * TypeScript compiler has its own internal handling for known file extensions.
    *
-   * Exact behaviour:
-   * - .js, .jsx, .tsx files are parsed as if this is true
-   * - .ts files are parsed as if this is false
-   * - unknown extensions (.md, .vue) will respect this setting
+   * For the exact behavior, see https://github.com/typescript-eslint/typescript-eslint/tree/master/packages/parser#parseroptionsecmafeaturesjsx
    */
-  jsx: false,
+  jsx?: boolean;
+
+  /**
+   * Controls whether the `loc` information to each node.
+   * The `loc` property is an object which contains the exact line/column the node starts/ends on.
+   * This is similar to the `range` property, except it is line/column relative.
+   */
+  loc?: boolean;
+
+  /*
+   * Allows overriding of function used for logging.
+   * When value is `false`, no logging will occur.
+   * When value is not provided, `console.log()` will be used.
+   */
+  loggerFn?: Function | false;
+
+  /**
+   * Controls whether the `range` property is included on AST nodes.
+   * The `range` property is a [number, number] which indicates the start/end index of the node in the file contents.
+   * This is similar to the `loc` property, except this is the absolute index.
+   */
+  range?: boolean;
+
+  /**
+   * Set to true to create a top-level array containing all tokens from the file.
+   */
+  tokens?: boolean;
 
   /*
    * The JSX AST changed the node type for string literals
    * inside a JSX Element from `Literal` to `JSXText`.
    * When value is `true`, these nodes will be parsed as type `JSXText`.
    * When value is `false`, these nodes will be parsed as type `Literal`.
    */
-  useJSXTextNode: false,
+  useJSXTextNode?: boolean;
+}
 
-  // Cause the parser to error if it encounters an unknown AST node type (useful for testing)
+const PARSE_DEFAULT_OPTIONS: ParseOptions = {
+  comment: false,
   errorOnUnknownASTType: false,
+  filePath: 'estree.ts', // or 'estree.tsx', if you pass jsx: true
+  jsx: false,
+  loc: false,
+  loggerFn: undefined,
+  range: false,
+  tokens: false,
+  useJSXTextNode: false,
+};
 
-  /*
-   * Allows overriding of function used for logging.
-   * When value is `false`, no logging will occur.
-   * When value is not provided, `console.log()` will be used.
+declare function parse(
+  code: string,
+  options: ParseOptions = PARSE_DEFAULT_OPTIONS,
+): TSESTree.Program;
+```
+
+Example usage:
+
+```js
+import { parse } from '@typescript-eslint/typescript-estree';
+
+const code = `const hello: string = 'world';`;
+const ast = parse(code, {
+  loc: true,
+  range: true,
+});
+```
+
+#### `parseAndGenerateServices(code, options)`
+
+Parses the given string of code with the options provided and returns an ESTree-compatible AST. Accepts additional options which can be used to generate type information along with the AST.
+
+```ts
+interface ParseAndGenerateServicesOptions extends ParseOptions {
+  /**
+   * Causes the parser to error if the TypeScript compiler returns any unexpected syntax/semantic errors.
    */
-  loggerFn: undefined,
+  errorOnTypeScriptSyntacticAndSemanticIssues?: boolean;
+
+  /**
+   * When `project` is provided, this controls the non-standard file extensions which will be parsed.
+   * It accepts an array of file extensions, each preceded by a `.`.
+   */
+  extraFileExtensions?: string[];
+
+  /**
+   * The absolute path to the file being parsed.
-   * The absolute path to the file being parsed.
+   * Absolute (or relative to `tsconfigRootDir`) path to the file being parsed.
-   * The absolute path to the file being parsed.
+   * Absolute (or relative to `tsconfigRootDir`) path to the file being parsed.
+   * When `project` is provided, this is required, as it is used to fetch the file from the TypeScript compiler's cache.
+   */
+  filePath?: string;
 
   /**
    * Allows the user to control whether or not two-way AST node maps are preserved
@@ -88,42 +174,67 @@ Parses the given string of code with the options provided and returns an ESTree-
    * NOTE: If `preserveNodeMaps` is explicitly set by the user, it will be respected,
    * regardless of whether or not `project` is in use.
    */
-  preserveNodeMaps: undefined
+  preserveNodeMaps?: boolean;
+
+  /**
+   * Absolute (or relative to `tsconfigRootDir`) paths to the tsconfig(s).
+   * If this is provided, type information will be returned.
+   */
+  project?: string | string[];
+
+  /**
+   * The absolute path to the root directory for all provided `project`s.
+   */
+  tsconfigRootDir?: string;
+
+  /**
+   ***************************************************************************************
+   * IT IS RECOMMENDED THAT YOU DO NOT USE THIS OPTION, AS IT CAUSES PERFORMANCE ISSUES. *
+   ***************************************************************************************
+   *
+   * When passed with `project`, this allows the parser to create a catch-all, default program.
+   * This means that if the parser encounters a file not included in any of the provided `project`s,
+   * it will not error, but will instead parse the file and its dependencies in a new program.
+   */
+  createDefaultProgram?: boolean;
 }
+
+const PARSE_AND_GENERATE_SERVICES_DEFAULT_OPTIONS: ParseOptions = {
+  ...PARSE_DEFAULT_OPTIONS,
+  errorOnTypeScriptSyntacticAndSemanticIssues: false,
+  extraFileExtensions: [],
+  preserveNodeMaps: false, // or true, if you do not set this, but pass `project`
+  project: undefined,
+  tsconfigRootDir: process.cwd(),
+};
+
+declare function parseAndGenerateServices(
+  code: string,
+  options: ParseOptions = PARSE_DEFAULT_OPTIONS,
+): TSESTree.Program;
 ```
 
 Example usage:
 
 ```js
-const parser = require('@typescript-eslint/typescript-estree');
+import { parseAndGenerateServices } from '@typescript-eslint/typescript-estree';
+
 const code = `const hello: string = 'world';`;
-const ast = parser.parse(code, {
-  range: true,
+const ast = parseAndGenerateServices(code, {
+  filePath: '/some/path/to/file/foo.ts',
   loc: true,
+  project: './tsconfig.json',
+  range: true,
 });
 ```
 
-### version
+### `TSESTree`, `AST_NODE_TYPES` and `AST_TOKEN_TYPES`
 
-Exposes the current version of `typescript-estree` as specified in `package.json`.
+Types for the AST produced by the parse functions.
 
-Example usage:
-
-```js
-const parser = require('@typescript-eslint/typescript-estree');
-const version = parser.version;
-```
-
-### `AST_NODE_TYPES`
-
-Exposes an object that contains the AST node types produced by the parser.
-
-Example usage:
-
-```js
-const parser = require('@typescript-eslint/typescript-estree');
-const astNodeTypes = parser.AST_NODE_TYPES;
-```
+- `TSESTree` is a namespace which contains object types representing all of the AST Nodes produced by the parser.
+- `AST_NODE_TYPES` is an enum which provides the values for every single AST node's `type` property.
+- `AST_TOKEN_TYPES` is an enum which provides the values for every single AST token's `type` property.
 
 ## Supported TypeScript Version
 

diff --git a/packages/typescript-estree/src/create-program/createDefaultProgram.ts b/packages/typescript-estree/src/create-program/createDefaultProgram.ts
@@ -3,9 +3,9 @@ import path from 'path';
 import * as ts from 'typescript';
 import { Extra } from '../parser-options';
 import {
-  getTsconfigPath,
-  DEFAULT_COMPILER_OPTIONS,
   ASTAndProgram,
+  getTsconfigPath,
+  createDefaultCompilerOptionsFromExtra,
 } from './shared';
 
 const log = debug('typescript-eslint:typescript-estree:createDefaultProgram');
@@ -31,7 +31,7 @@ function createDefaultProgram(
 
   const commandLine = ts.getParsedCommandLineOfConfigFile(
     tsconfigPath,
-    DEFAULT_COMPILER_OPTIONS,
+    createDefaultCompilerOptionsFromExtra(extra),
     { ...ts.sys, onUnRecoverableConfigFileDiagnostic: () => {} },
   );
 

diff --git a/packages/typescript-estree/src/create-program/createIsolatedProgram.ts b/packages/typescript-estree/src/create-program/createIsolatedProgram.ts
@@ -3,7 +3,7 @@ import * as ts from 'typescript';
 import { Extra } from '../parser-options';
 import {
   ASTAndProgram,
-  DEFAULT_COMPILER_OPTIONS,
+  createDefaultCompilerOptionsFromExtra,
   getScriptKind,
 } from './shared';
 
@@ -67,7 +67,7 @@ function createIsolatedProgram(code: string, extra: Extra): ASTAndProgram {
       noResolve: true,
       target: ts.ScriptTarget.Latest,
       jsx: extra.jsx ? ts.JsxEmit.Preserve : undefined,
-      ...DEFAULT_COMPILER_OPTIONS,
+      ...createDefaultCompilerOptionsFromExtra(extra),
     },
     compilerHost,
   );

diff --git a/packages/typescript-estree/src/create-program/createWatchProgram.ts b/packages/typescript-estree/src/create-program/createWatchProgram.ts
@@ -6,9 +6,9 @@ import { WatchCompilerHostOfConfigFile } from './WatchCompilerHostOfConfigFile';
 import {
   canonicalDirname,
   CanonicalPath,
-  getTsconfigPath,
-  DEFAULT_COMPILER_OPTIONS,
+  createDefaultCompilerOptionsFromExtra,
   getCanonicalFileName,
+  getTsconfigPath,
 } from './shared';
 
 const log = debug('typescript-eslint:typescript-estree:createWatchProgram');
@@ -233,7 +233,7 @@ function createWatchProgram(
   // create compiler host
   const watchCompilerHost = ts.createWatchCompilerHost(
     tsconfigPath,
-    DEFAULT_COMPILER_OPTIONS,
+    createDefaultCompilerOptionsFromExtra(extra),
     ts.sys,
     ts.createSemanticDiagnosticsBuilderProgram,
     diagnosticReporter,

diff --git a/packages/typescript-estree/src/create-program/shared.ts b/packages/typescript-estree/src/create-program/shared.ts
@@ -20,6 +20,19 @@ const DEFAULT_COMPILER_OPTIONS: ts.CompilerOptions = {
   noUnusedParameters: true,
 };
 
+function createDefaultCompilerOptionsFromExtra(
+  extra: Extra,
+): ts.CompilerOptions {
+  if (extra.debugLevel.has('typescript')) {
+    return {
+      ...DEFAULT_COMPILER_OPTIONS,
+      extendedDiagnostics: true,
+    };
+  }
+
+  return DEFAULT_COMPILER_OPTIONS;
+}
+
 // This narrows the type so we can be sure we're passing canonical names in the correct places
 type CanonicalPath = string & { __brand: unknown };
 
@@ -85,7 +98,7 @@ export {
   ASTAndProgram,
   canonicalDirname,
   CanonicalPath,
-  DEFAULT_COMPILER_OPTIONS,
+  createDefaultCompilerOptionsFromExtra,
   ensureAbsolutePath,
   getCanonicalFileName,
   getScriptKind,