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parser.ts
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parser.ts
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import {
calculateProjectParserOptions,
createProgram,
} from './tsconfig-parser';
import semver from 'semver';
import ts from 'typescript';
import convert from './ast-converter';
import { convertError } from './convert';
import { firstDefined } from './node-utils';
import { TSESTree } from './ts-estree';
import { Extra, ParserOptions, ParserServices } from './parser-options';
import { getFirstSemanticOrSyntacticError } from './semantic-errors';
/**
* This needs to be kept in sync with the top-level README.md in the
* typescript-eslint monorepo
*/
const SUPPORTED_TYPESCRIPT_VERSIONS = '>=3.2.1 <3.5.0';
const ACTIVE_TYPESCRIPT_VERSION = ts.version;
const isRunningSupportedTypeScriptVersion = semver.satisfies(
ACTIVE_TYPESCRIPT_VERSION,
SUPPORTED_TYPESCRIPT_VERSIONS,
);
let extra: Extra;
let warnedAboutTSVersion = false;
/**
* Compute the filename based on the parser options.
*
* Even if jsx option is set in typescript compiler, filename still has to
* contain .tsx file extension.
*
* @param options Parser options
*/
function getFileName({ jsx }: { jsx?: boolean }) {
return jsx ? 'estree.tsx' : 'estree.ts';
}
/**
* Resets the extra config object
*/
function resetExtra(): void {
extra = {
tokens: null,
range: false,
loc: false,
comment: false,
comments: [],
strict: false,
jsx: false,
useJSXTextNode: false,
log: console.log,
projects: [],
errorOnUnknownASTType: false,
errorOnTypeScriptSyntacticAndSemanticIssues: false,
code: '',
tsconfigRootDir: process.cwd(),
extraFileExtensions: [],
preserveNodeMaps: undefined,
};
}
/**
* @param code The code of the file being linted
* @param options The config object
* @returns If found, returns the source file corresponding to the code and the containing program
*/
function getASTFromProject(code: string, options: ParserOptions) {
return firstDefined(
calculateProjectParserOptions(
code,
options.filePath || getFileName(options),
extra,
),
currentProgram => {
const ast = currentProgram.getSourceFile(
options.filePath || getFileName(options),
);
return ast && { ast, program: currentProgram };
},
);
}
/**
* @param code The code of the file being linted
* @param options The config object
* @returns If found, returns the source file corresponding to the code and the containing program
*/
function getASTAndDefaultProject(code: string, options: ParserOptions) {
const fileName = options.filePath || getFileName(options);
const program = createProgram(code, fileName, extra);
const ast = program && program.getSourceFile(fileName);
return ast && { ast, program };
}
/**
* @param code The code of the file being linted
* @returns Returns a new source file and program corresponding to the linted code
*/
function createNewProgram(code: string) {
const FILENAME = getFileName(extra);
const compilerHost: ts.CompilerHost = {
fileExists() {
return true;
},
getCanonicalFileName() {
return FILENAME;
},
getCurrentDirectory() {
return '';
},
getDirectories() {
return [];
},
getDefaultLibFileName() {
return 'lib.d.ts';
},
// TODO: Support Windows CRLF
getNewLine() {
return '\n';
},
getSourceFile(filename: string) {
return ts.createSourceFile(filename, code, ts.ScriptTarget.Latest, true);
},
readFile() {
return undefined;
},
useCaseSensitiveFileNames() {
return true;
},
writeFile() {
return null;
},
};
const program = ts.createProgram(
[FILENAME],
{
noResolve: true,
target: ts.ScriptTarget.Latest,
jsx: extra.jsx ? ts.JsxEmit.Preserve : undefined,
},
compilerHost,
);
const ast = program.getSourceFile(FILENAME)!;
return { ast, program };
}
/**
* @param code The code of the file being linted
* @param options The config object
* @param shouldProvideParserServices True iff the program should be attempted to be calculated from provided tsconfig files
* @returns Returns a source file and program corresponding to the linted code
*/
function getProgramAndAST(
code: string,
options: ParserOptions,
shouldProvideParserServices: boolean,
) {
return (
(shouldProvideParserServices && getASTFromProject(code, options)) ||
(shouldProvideParserServices && getASTAndDefaultProject(code, options)) ||
createNewProgram(code)
);
}
function applyParserOptionsToExtra(options: ParserOptions): void {
/**
* Track range information in the AST
*/
extra.range = typeof options.range === 'boolean' && options.range;
extra.loc = typeof options.loc === 'boolean' && options.loc;
/**
* Track tokens in the AST
*/
if (typeof options.tokens === 'boolean' && options.tokens) {
extra.tokens = [];
}
/**
* Track comments in the AST
*/
if (typeof options.comment === 'boolean' && options.comment) {
extra.comment = true;
extra.comments = [];
}
/**
* Enable JSX - note the applicable file extension is still required
*/
if (typeof options.jsx === 'boolean' && options.jsx) {
extra.jsx = true;
}
/**
* 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`.
*/
if (typeof options.useJSXTextNode === 'boolean' && options.useJSXTextNode) {
extra.useJSXTextNode = true;
}
/**
* Allow the user to cause the parser to error if it encounters an unknown AST Node Type
* (used in testing)
*/
if (
typeof options.errorOnUnknownASTType === 'boolean' &&
options.errorOnUnknownASTType
) {
extra.errorOnUnknownASTType = true;
}
/**
* Allow the user to override the function used for logging
*/
if (typeof options.loggerFn === 'function') {
extra.log = options.loggerFn;
} else if (options.loggerFn === false) {
extra.log = Function.prototype;
}
if (typeof options.project === 'string') {
extra.projects = [options.project];
} else if (
Array.isArray(options.project) &&
options.project.every(projectPath => typeof projectPath === 'string')
) {
extra.projects = options.project;
}
if (typeof options.tsconfigRootDir === 'string') {
extra.tsconfigRootDir = options.tsconfigRootDir;
}
if (
Array.isArray(options.extraFileExtensions) &&
options.extraFileExtensions.every(ext => typeof ext === 'string')
) {
extra.extraFileExtensions = options.extraFileExtensions;
}
/**
* Allow the user to enable or disable the preservation of the AST node maps
* during the conversion process.
*
* NOTE: For backwards compatibility we also preserve node maps in the case where `project` is set,
* and `preserveNodeMaps` is not explicitly set to anything.
*/
extra.preserveNodeMaps =
typeof options.preserveNodeMaps === 'boolean' && options.preserveNodeMaps;
if (options.preserveNodeMaps === undefined && extra.projects.length > 0) {
extra.preserveNodeMaps = true;
}
}
function warnAboutTSVersion(): void {
if (!isRunningSupportedTypeScriptVersion && !warnedAboutTSVersion) {
const border = '=============';
const versionWarning = [
border,
'WARNING: You are currently running a version of TypeScript which is not officially supported by typescript-estree.',
'You may find that it works just fine, or you may not.',
`SUPPORTED TYPESCRIPT VERSIONS: ${SUPPORTED_TYPESCRIPT_VERSIONS}`,
`YOUR TYPESCRIPT VERSION: ${ACTIVE_TYPESCRIPT_VERSION}`,
'Please only submit bug reports when using the officially supported version.',
border,
];
extra.log(versionWarning.join('\n\n'));
warnedAboutTSVersion = true;
}
}
//------------------------------------------------------------------------------
// Parser
//------------------------------------------------------------------------------
type AST<T extends ParserOptions> = TSESTree.Program &
(T['range'] extends true ? { range: [number, number] } : {}) &
(T['tokens'] extends true ? { tokens: TSESTree.Token[] } : {}) &
(T['comment'] extends true ? { comments: TSESTree.Comment[] } : {});
export interface ParseAndGenerateServicesResult<T extends ParserOptions> {
ast: AST<T>;
services: ParserServices;
}
//------------------------------------------------------------------------------
// Public
//------------------------------------------------------------------------------
export const version: string = require('../package.json').version;
export function parse<T extends ParserOptions = ParserOptions>(
code: string,
options?: T,
): AST<T> {
/**
* Reset the parse configuration
*/
resetExtra();
/**
* Ensure users do not attempt to use parse() when they need parseAndGenerateServices()
*/
if (options && options.errorOnTypeScriptSyntacticAndSemanticIssues) {
throw new Error(
`"errorOnTypeScriptSyntacticAndSemanticIssues" is only supported for parseAndGenerateServices()`,
);
}
/**
* Ensure the source code is a string, and store a reference to it
*/
if (typeof code !== 'string' && !((code as any) instanceof String)) {
code = String(code);
}
extra.code = code;
/**
* Apply the given parser options
*/
if (typeof options !== 'undefined') {
applyParserOptionsToExtra(options);
}
/**
* Warn if the user is using an unsupported version of TypeScript
*/
warnAboutTSVersion();
/**
* Create a ts.SourceFile directly, no ts.Program is needed for a simple
* parse
*/
const ast = ts.createSourceFile(
getFileName(extra),
code,
ts.ScriptTarget.Latest,
/* setParentNodes */ true,
);
/**
* Convert the TypeScript AST to an ESTree-compatible one
*/
const { estree } = convert(ast, extra, false);
return estree as AST<T>;
}
export function parseAndGenerateServices<
T extends ParserOptions = ParserOptions
>(code: string, options: T): ParseAndGenerateServicesResult<T> {
/**
* Reset the parse configuration
*/
resetExtra();
/**
* Ensure the source code is a string, and store a reference to it
*/
if (typeof code !== 'string' && !((code as any) instanceof String)) {
code = String(code);
}
extra.code = code;
/**
* Apply the given parser options
*/
if (typeof options !== 'undefined') {
applyParserOptionsToExtra(options);
if (
typeof options.errorOnTypeScriptSyntacticAndSemanticIssues ===
'boolean' &&
options.errorOnTypeScriptSyntacticAndSemanticIssues
) {
extra.errorOnTypeScriptSyntacticAndSemanticIssues = true;
}
}
/**
* Warn if the user is using an unsupported version of TypeScript
*/
warnAboutTSVersion();
/**
* Generate a full ts.Program in order to be able to provide parser
* services, such as type-checking
*/
const shouldProvideParserServices =
extra.projects && extra.projects.length > 0;
const { ast, program } = getProgramAndAST(
code,
options,
shouldProvideParserServices,
);
/**
* Determine whether or not two-way maps of converted AST nodes should be preserved
* during the conversion process
*/
const shouldPreserveNodeMaps =
extra.preserveNodeMaps !== undefined
? extra.preserveNodeMaps
: shouldProvideParserServices;
/**
* Convert the TypeScript AST to an ESTree-compatible one, and optionally preserve
* mappings between converted and original AST nodes
*/
const { estree, astMaps } = convert(ast, extra, shouldPreserveNodeMaps);
/**
* Even if TypeScript parsed the source code ok, and we had no problems converting the AST,
* there may be other syntactic or semantic issues in the code that we can optionally report on.
*/
if (program && extra.errorOnTypeScriptSyntacticAndSemanticIssues) {
const error = getFirstSemanticOrSyntacticError(program, ast);
if (error) {
throw convertError(error);
}
}
/**
* Return the converted AST and additional parser services
*/
return {
ast: estree as AST<T>,
services: {
program: shouldProvideParserServices ? program : undefined,
esTreeNodeToTSNodeMap:
shouldPreserveNodeMaps && astMaps
? astMaps.esTreeNodeToTSNodeMap
: undefined,
tsNodeToESTreeNodeMap:
shouldPreserveNodeMaps && astMaps
? astMaps.tsNodeToESTreeNodeMap
: undefined,
},
};
}
export { AST_NODE_TYPES, AST_TOKEN_TYPES, TSESTree } from './ts-estree';
export { ParserOptions, ParserServices };